ph analyser manual ph-13-s

8/11/2019 PH Analyser Manual PH-13-S

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Operating Instruction Manual PH-13-S Halland Instruments AS http://www.hain.no/ 1

Halland Instruments AS

Operating Instruction Manual

PH-13-S pH Measuring Station


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Contents

1. FUNCTION. ...................................................... ........................................................... ..................................... 3

1.1 How it works. ............................................................................................................................................ 31.2 Remote start and stop via the Modbus interface. ............................................................. ......................... 31.3 Program, sequence.................................................................................................................................... 41.4 Starting and stopping the instrument manually......................................................................................... 41.5 The Modbus calls. ............................................................ .................................................................. ....... 41.6 Transmitter mode ........................................................... .................................................................... ....... 51.7 Stopping of washing if there is solution in the measuring bowl................................................................ 51.8 Manual washing........................................................................................................................................ 5

2. INSTALLATION............................................................... .............................................................. ................. 5

2.1 Mechanical................................................................................................................................................ 52.2 Electrical connections............................................................................................................................... 72.3 Preparations before the instrument are started for the first time.............................................................. 8

2.4PROGRAMMING. ....................................................... ........................................................... ........................... 82.5 How to change the period of time for the different steps in the program.................................................. 92.6 How to set the measuring range................................................................................................................ 92.7 How to change the Modbus address.......................................................................................................... 92.8 How to change the frequency of acid wash............................................................................................... 92.9 The intelligent warnings. ....................................................... ............................................................. 10

3. OPERATION. ............................................................. ........................................................... ......................... 11

3.1 Checking of accuracy.............................................................................................................................. 113.2 Checking procedure. ........................................................... ............................................................... ..... 113.3 Calibration.............................................................................................................................................. 113.4 Replacing of the electrode....................................................................................................................... 12

4. MAINTENANCE AND TROUBLESHOOTING. ............................................................... ........................ 13

4.1 Preventive maintenance. ............................................................ ............................................................. 134.2 Schematic diagram water/air/process..................................................................................................... 134.3 The most common operating problems. .................................................................................................. 134.4 Test procedure......................................................................................................................................... 14

4.5ERROR MESSAGES. ................................................... ........................................................... ......................... 144.6 Suction fault. ........................................................................................................................................... 154.7 Drain fault............................................................................................................................................... 164.8 Warning, no acid..................................................................................................................................... 164.9 Temperature error................................................................................................................................... 16

4.10 Calibration error................................................................................................................................... 164.11 Internal wiring diagram........................................................................................................................ 174.12 The electronic unit................................................................................................................................. 174.13 Manual steering of the valves................................................................................................................ 174.14 Arrangement, wet cabinet. .................................................................................................................... 18

5. SPARE PARTS. ........................................................ ............................................................. ......................... 20

6. DATA SHEET.......................................................... .............................................................. ......................... 21


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1. Function.

1.1 How it works.

The instrument measures pH intermittently.

The instrument sucks a sample from the process, to a measuring chamber (bowl), where the

pH is measured. The sample is then returned to the process. The instrument then sucks up 19

ml of a suitable detergent from a container (container not included). The bowl and the pH

electrode are sprayed with this solution. After an interval the pH combination electrode and

the bowl are washed with water, then the water is drained to the process and then the cycle

repeats itself. The longest times are usually the suction time and the stabilizing time. (The

time the pH electrodes take to measure pH correctly). A short suction time is achieved by

mounting the instrument close to the measuring point. The stabilization time is mostly a

function of the temperature difference between the washing water and the solution, the higherdifference the longer time.

Acid wash is normally once per cycle, if there is no need for acid wash, it is possible to

change one of the setup variables to zero, then the instrument skips the steps 'Acid suction',

'Acid wash' and 'Interval', the parameter is called; ' Freq. acid wash'. See point 2.8.

By removing the spade in the acid dosing cell, the acid consumption is reduced from 19 ml

per sample to 4 ml per sample.

Acid wash is a shock for the electrode and it can take several minutes for the instrument to

measure accurately after acid wash.

The functioning of the intelligent warnings is described under point 2.9.

During operation the display shows program step in line one and pH and temperature in line

two. If warnings are activated the display shows a number to the right in the first line. This is

described under point 4.5. If the instrument stops because of a fault condition, the display

shows the error message as text.

During calibration, stop and setup, the outputs are frozen to the last measurement before the

instrument was stopped.

1.2 Remote start and stop via the Modbus interface.

The instrument can be started and stopped from a supervisory process control computer,

through the Modbus interface (force single coil). When the instrument receives a stop

command, it will finish the cycle and stop after step 7, 'Draining'. A start command functions

as a reset and will always start the instrument instantaneously with step 1. The pH,

temperature, step in operation, errors and warnings can be read with the Modbus call read

register


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1.3 Program, sequence

StepNo.

Action Valves on: Standardtimeseconds

Comments, (locks)

1 Emptying

aftermeasuring

SV1 10

2 Acidsuction

SV7, SV6SV4 openafter 1 s.

maximum35 notadjustable

When the acid reaches the acid electrodes in the acid dosing cell,the program continues with step 3. If 35 seconds passes withoutthe acid reaching the electrodes, the warning message 'No acid'appears in the LCD, the program then continues with step 3.

3 Acid wash SV3, SV1 3

4 Interval SV1 10

5 (Spraying oftheelectrode)

0 Not used

6 Spraying ofthe cell

SV3, SV1 10 The valves closes if the level electrodes measures that it issolution in the measuring cell SEE 1.7

7 Draining SV1 16

8 Suction of

solution

SV7, SV6, 240 If the level is reached before 5 seconds has passed the error

message 'Drain fault' appears in the display, if the level is notreached within 240 seconds the error message 'Suction fault,appears in the display. In both cases the instrument stops.

9 Stabilization 20 If the level in the measuring cell falls below the level electrodeSV7, SV6 and SV5 opens, until the level is reached again

10 Measuring 1

1.4 Starting and stopping the instrument manually.

If the instrument has stopped because of a fault condition, for instance Suction fault,

pressing the 'RESET' button, or a Modbus start command will start it again.

If the instrument has been stopped by pressing the 'MENU' button, in connection with

checking/calibration, or changing of the setup variables, the instrument should be started by

selecting 'Start instrument?' in the main menu and then pressing 'ENT'.

Fault conditions as for instance 'WARNING!! NO ACID' or the intelligent alarms, will not

stop the instrument. The warnings disappear when the error condition is gone. The warnings

are transmitted through the Modbus line and by the alarm relay contact until the 'RESET'button is pressed, or the instrument receives Modbus start command from the supervisory

system.

1.5 The Modbus calls.

The following Modbus RTU functions are used:

03 Read holding registers.

05 Force single coil.

Function 03 is used to read: pH value, temperature, current program step and error/fault no.

Function 05 is used to start and stop the instrument.


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1.6 Transmitter mode

This function is called from the main menu, press Menu used the up/down buttons to find

Transmitter mode press Ent. The instrument will then measure pH continuously and the

mA output and the Modbus line transmits the continuous measurement.

1.7 Stopping of washing if there is solution in the measuring bowl.

This function is called from the main menu, press Menu used the up/down buttons to find

Level=No wash press Ent. Press 1, this inhibits washing if there is liquid in the bowl.

Press 0 to wash regardless of the level of liquid in the measuring bowl. Normally this

function is of, 0.

1.8 Manual washing.

This function is called from the main menu, press Menu used the up/down buttons to findManual wash press Ent. The instrument sprays the measuring bowl for one minute or until

the Menu button is pressed.

2. Installation.

2.1 Mechanical.

The instruments are delivered with four fastening lugs, this lugs (fastening-ears) must be

fitted to the cabinets according to the instructions delivered with the instruments.

The fastening-ears shown in the corners of the instrument is used to bolt the instrument to a

frame or on a wall.


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Connection drawing for PH-13, PH-13-S and CON-13.

Bottom view.

From Left to Right:

All connections are for 8 mm tubing, except solution in/out, which is for 12 mm tubing.

For specifications of max. suction height, water pressure etc. see Chapter 6, datasheet.

Sampling point.

The instrument should be mounted higher than the process connection (preferably), the

distance between the instrument and the sampling point should be short (preferably). The

connection is made with a 12 mm flexible Teflon (or PVDF) tube. The measuring point

should be located in a position where the solution is not containing a lot of air, as this will

prolong the suction time and in the worst case disturb the measurement.

Drain. (Ejector exhaust)

Always connect a short 8 mm tube to this union to lead the exhaust away from the operators.

Acid.

The instrument should be connected to the acid container with an 8mm teflon tube. The

instrument sucks acid from the acid container. However the acid container should preferably

be placed at the same height as the instrument. (level of acid in container; approximately at

the same height as the bottom of the instrument)

Cable glands:

1. 110 VAC, cable glands

2. mA and Alarm signal, cable gland

3. Modbus, cable gland

Tube connections:

4. Sample in/in out

5. Acid in.

6. Atmosphere only

7. Water in

8. Ejector exhaust

9. Air in


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2.2 Electrical connections.

The cable gland to the right (see picture below) is for connection to 110 VAC, this connection

is secured by a glass fuse 0,630 mA (slow). The fuse is easy to access.

The cable gland in the middle is for connection of 4-20 mA signal and alarm. The 4-20 mA

output is passive and must be fed by an external power supply (24 VDC typ.). The alarmconnection is a changeover relay contact (NO-C-NC).

The cable gland to the left is for the Modbus connection. A cable suitable for RS485

communication (one twisted pair with screen) should be used, the maximum distance is ca 1.2

km, the cable may be terminated with a 120 ohm resistor.

Terminal

no.

Signal description: Drawing,

ref.15 +24 volt dc in, 4-20 current loop feeding +

16 Return, 4-20 mA, load connected from this terminal to earth of 24

VDC supply

Ret

17 RS485/MODBUS A

18 RS485/MODBUS B

19 Connect to screen of RS485/MODBUS cable Screen

34 Alarm relay contact, normally closed NC

35 Alarm relay contact, common C

36 Alarm relay contact, normally open NO

37 110 VAC L38 110 VAC N

39 Earth, is connected to the common ground point in the cabinet.

Earth wire from the 110 VAC supply should be connected to this

common grounding point.

Earth

It is important that the instrument is connected to earth, use the common grounding point

down to the left in the right cabinet.


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2.3 Preparations before the instrument are started for the first time.

Adjust the pressure regulator for the ejector to 1 bar. Install the pH combination electrode.

Set power on the instrument, the instrument will now start automatically using the factory-

default setup variables. Press reset.Wait for the program step Suction of solution, adjust the pressure regulator for the ejector

for a smooth suction, NB! There shall not be a fountain in the measuring bowl during

suction.

Set the stabilization to 75 seconds (see point 2.5) for instructions.

Let the instrument run some cycles. Check the measurement during stabilization and find how

long time it takes for the measurement to stabilize. Stop the instrument and adjust the

stabilization time accordingly. Set the measuring range, see point 2.6 for instructions.

Start the analyzer and check that the draining times are sufficient long for the sample to be

returned to the process, adjust if necessary. Let the analyzer run for some hours before

checking of accuracy/calibration, see point 3.1.

If the measuring point is in a tank with variable level it can be necessary to use pressure todrain the solution tube. To do this; connect the drain tube atmosphere on the drawing to

Pressure regulator for draining, see picture point 4.14. Adjust the pressure to 0-0.5 bar, use

only as high pressure as necessary.

2.4 Programming.

When a parameter shall be changed, the CLR button is used to zero the parameter. Then the

new value is entered with the number buttons or use the arrow buttons to increase/decreasethe value. Press ENT to terminate.


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2.5 How to change the period of time for the different steps in the program.

Press 'MENU' the display shows 'Start instrument?'

Use (press) the arrow-buttons until the display shows 'Setup variables?'

Press 'ENT' the display shows 'Draining time =xxxx '. Where xxxx is the draining time inseconds.

Use the arrow-buttons to find the time you want to change.

Press 'ENT' and the '=' changes to '?'.

Enter new value. (use the procedure; point 2.4)

If you want to change more times, use the arrow-buttons to select the time you want to

change.

You can always go back to the main menu by pressing 'MENU'. (min 1 second)

2.6 How to set the measuring range.

The maximum measuring range is 0-14 pH units, (Zero=0, Range=14) minimum measuringrange is one pH unit, for instance 7-8 pH, (Zero=7, Range=1). The measuring range can only

be set in whole numbers.

Press MENU the display shows 'Start instrument?'


Press 'ENT'.

Use the arrow-buttons to find 'Zero point meas. = xxxx'. Press 'ENT' and the '=' changes to '?'.

Enter new value.

Use the arrow-buttons to find 'Measuring range=xxxx', this value is changed in the same way

as 'Zero point meas. = xxxx'.

2.7 How to change the Modbus address.



Press 'ENT'.

Use the arrow-buttons to find 'Device address = xxxx'. Press 'ENT' and the '=' changes to '?'.

Enter new value.

2.8 How to change the frequency of acid wash.



Press 'ENT'.

Use the arrow-buttons to find 'Freq. acid wash = xxxx'. Press 'ENT' and the '=' changes to '?'.

Enter new value.

1 means washing with acid every cycle, 2 means washing with acid every second cycle, etc.


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2.9 The intelligent warnings.

There are four limits; two of them check the electrode response during measuring. The other

two check the measurement value. The warnings are given over the Modbus line and by the

alarm relay. The warnings disappear when the error condition is gone. The alarms can also bereset by resetting the analyzer from the panel or over the Modbus line.

1. 'HIGH, ELECT. RESPONSEAfter the sample has reached the electrodes, it takes some time Stabilization time before the

electrodes measures correctly. The instrument calculates the difference between the

measurement after two seconds and after the stabilization time is finished. If the difference is

large then the response of the electrode is slow, and the instrument is probably not measuring

correctly and the pH electrode should be replaced. The alarm limit can be set in the range 0-

7 pH. If the change in the measurement during stabilization is higherthan the limit the

instrument gives warning over Modbus and the alarm relay falls out.

This warning function is disabled by setting the limit to 7 pH.2. LOW, ELECT. RESPONSE

After the sample has reached the electrodes, it takes some time Stabilization time before the

electrodes measures correctly. The instrument calculates the difference between the

measurement after two seconds and after the stabilization time is finished. If the difference is

small then the electrode has low sensitivity, the instrument is probably not measuring

correctly and the pH electrode should be replaced. The alarm limit can be set in the range 0-

7 pH. If the change in the measurement during stabilization is lowerthan the limit the

instrument gives warning over Modbus and the alarm relay falls out.

This warning function is disabled by setting the limit to 0 pH.

3. HIGH, MEASUREM. CHANGE.The analyzer remembers the last 8 measurements and calculates the average. The program

than calculates the difference between the new measurement and the average. If the difference

is greater than the alarm limit the instrument gives warning over Modbus and the alarm relay

falls out.

This happens if an abnormal process state occurs.


4. LOW, MEASUREM. CHANGE.The analyzer remembers the last 8 measurements. The program then calculates the difference

between the highest and the lowest measurement of these eight. If the difference betweenhighest and lowest value is smaller than the alarm limit the instrument gives warning over

Modbus and the alarm relay falls out.

The cause may be that the glass is broken or the process is very (abnormal) stable.


Procedure:

1. Chose Set, alarm limits in the main menu.

2. Use the arrow buttons to find the limit you want to change.

3. Press ENT

4. Press CLR, enter new value, press ENT

5. Press MENU


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3. Operation.

3.1 Checking of accuracy.

We recommend that the accuracy be checked once a week using buffer solution.

Usually it is not necessary to calibrate, calibration shall not be performed as a routine,

calibrate only when necessary.

Calibration is done using two buffer solutions, buffer value high shall have the same pH as the

high endpoint of the measurement, and the buffer value low shall have the same pH as the low

endpoint of the measurement.

(Example, 'Zero point meas. = 0002', 'Measuring range=0003', 4-20 mA equals 2-5 pH, use

buffer 2 pH, and buffer 5).

(Merck manufactures buffer solutions with pH values 1,2,3,4,5,6,7,8......)

3.2 Checking procedure.

Wait until the display shows'Draining'. Stop the instrument by pressing 'MENU'.

(Pressing ENT starts the instrument)

Use the arrow buttons to find 'Continuous measuring', press 'ENT'.

The display shows the current pH and temperature.

Put the pH combination electrode and the temperature probe in low value buffer.

Read the pH after 40 seconds and 60 seconds. The difference should be less than 0.2 (0.1) pH,

if higher the pH electrode should be changed.Repeat this step using high value buffer.

If the readout of any of these two measurements differs more than 0.2 (0.1) pH (after 60

seconds) from the nominal pH buffer values, the instrument should be calibrated.

3.3 Calibration.

This analyzer uses two point calibration only.

Put the pH combination electrode and the temperature probe in low value buffer. Press

'MENU' find Calibration?' (use the arrows), press 'ENT', find 'Calibration / Buffer low, press'ENT', wait one minute, check the readout, if you want to proceed press, 'ENT' if not press

'MENU'. Wash the electrodes in water. Put the electrodes in high value buffer, press 'ENT',

wait one minute, check the readout, if you want to proceed press, 'ENT' if not press 'MENU'.

Now the instrument is calibrated.

If the display shows 'Calibration fault' the glass electrode should be replaced, see section 3.4.

Put the electrodes back; do not use tools on the nutsthat keep the electrodes in place.

Press 'MENU', the display shows 'Start instrument?' press 'ENT' to start the instrument.


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3.4 Replacing of the electrode.

pH combination electrode.

If the pH combination electrode is changed it is important that the connector is put properly

into the electrode, and that the cable and electrode are treated with care.

Carry out the checking procedure, see section 3.2.Calibrate only if the deviation is greater than 0.2 pH.

After 6-24 hour this procedure should be repeated and the instrument calibrated if the

deviation is greater than 0.1 pH.

The pH combination electrode should be replaced when the response is slow or if you get the

error message 'Calibration fault'.


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4. Maintenance and troubleshooting.

During trouble shouting and maintenance the frequency of acid wash should

always be set to zero. To avoid acid wounds etc.

4.1 Preventive maintenance.

Recommendations:

Recommend that you replace the diaphragms in solenoid valves 2, 4, 5, and 6 minimum twice

a year. Replace all valves (including valve seats) and ejector every year.

Bowl, nozzles, cover (underside) and ejector should be cleaned once a year.

4.2 Schematic diagram water/air/process.

4.3 The most common operating problems.

Usually the problems are outside the instrument, especially the suction tube. It can be closed,

or periodically blocked, not properly down in the liquid in such a way that the instrument

sucks air

The drain tube (ejector exhaust) is also a week point, it can be blocked if it is put into the

solution.


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4.4 Test procedure.

During trouble shouting and maintenance the frequency of acid wash should always be set to

zero. To avoid acid wounds etc.

The first you should do is to find out if the problem is outside the instrument.

Disconnect the 12 mm suction tube at the union under the instrument. Stab a screwdriver up

through the union to check that it is open.

Start the instrument. (press 'RESET')

When the program is in the steps: 'Draining', 'Emptying after meas.'or 'Interval', Air shall

blow out of this union.

When the program is in the step 'Suction of solution', air shall come out of the drain tube

(ejector exhaust).

By closing the union with a finger (use rubber gloves), when the instrument is in the step

'Suction of solution', you should feel that vacuum builds up in the bowl.

If these things are as described, the error is most probably outside the instrument.

4.5 Error messages.

Usually you will be called after the instrument has sent an error message to the control

system, normally this error message is shown in the LC Display on the electronic unit.

Error messages

1. Suction fault. The analyzers stop

2. Draining fault. The analyzers stop3. Warning!!! No acid. Warning only, 5 is shown to the left in the

first line of the LCD

4. Temperature fault. The analyzers stop

5. Calibration fault. Warning only

6. High alarm, electrode response Warning only, 8 is shown to the left in the


7. Low alarm, electrode response Warning only, 9 is shown to the left in the


8. High alarm, measurement change Warning only, 6 is shown to the left in the


9. Low alarm, measurement change Warning only, 7 is shown to the left in thefirst line of the LCD


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4.6 Suction fault.

Possible causes:

Outside the analyzer:

Closed or partially blocked suction tube.The instrument sucks air; the suction tube is not in the solution, or there is a leakage in the

solution tube or the union.

The drain tube is blocked.

Very low air pressure.

We recommend that you carry out the test procedure, see section 4.4, to find out if the

problem is outside of the instrument.

If there is not blowing air out of the ejector exhaust during Suction of solution, the valve

SV7 should be checked, disconnect the ejector and try operating the valve manually (see

4.13 for instructions). Clean or replace the valve if it does not work.

(Reconnect the suction tube.)

1.

Check that the spray nozzle is spraying water during Spraying of cell. If not take out the

spray nozzle, clean or replace it.

2.

Shut of the water supply. Disconnect the tube to the spray nozzle in the middle of the cover,

start the analyzer and wait for Suction of solution. Hold a finger over the tube end and check

for vacuum. If you cannot feel the vacuum, proceed with point 3. If you have vacuum the

problem is leakage in the bowl lid assembly for instance in;

Cover, unions.

Cover, O-ring between ring and cover.

Bottom union and bowl.

Bottom union and tube.

Look over the unions (dismantle-clean-assemble).

If this doesn't work, you will have to put pressure on the bowl. Take out the spring and

plunger in SV1, disconnect the 12 mm suction tube and plug this union.

The bowl now gets pressure via SV1 (do not use higher pressure than 0,7 bar, do not start the

instrument), use soap water to find the leakage.

3.

No vacuum from the manifold plate. Disconnect the tube from the ejector side to the manifold

plate, start the analyzer and wait for Suction of solution. Hold a finger over the connection

to the ejector. If you have vacuum here the problem is SV6, replace it. If there is no vacuum

from the ejector then the ejector should be rinsed or replaced.


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4.7 Drain fault.

This error message can have two causes, either there is an electrical shorting because of

dirt between the level electrode and the temperature probe, or there is a real drainage

problem.a) The error message appears at once when the program comes to the step ' Suction of

solution'. If there is no solution in the bowl the problem is dirt. Try 'Manual wash'in the main

menu, see 1.8.

If this doesn't clear the problem the cover must be taken of and cleaned by hand. Be very

careful when you put the cover on, the O-ring must have a stable position, fasten the screw

gradually one by one.

b) The bowl is not emptied, before the step 'Suction of solution'.

Carry out the test procedure; see section 4.4, to find out if the problem is outside the

instrument.

Disconnect the tube at the union on the upper left side of the manifold plate, the drain tube.

Start the instrument. In the steps 'Draining' and 'Emptying after measuring' air shall blow outof this connection. If not there is something wrong with SV1, replace it.

4.8 Warning, no acid.

(check that acid is available)

Disconnect the acid-tube, wait until the step 'Acid suction'for the second time.

During the step 'Acid suction',you shall see bubbles in the acid dosing cell.

If not (no bubbles) replace SV4, also if the problem is periodically the problem is probably

that this valve is not working properly.

(Problems with the suction parts will result in a 'Suction fault'.)

4.9 Temperature error.

Press 'MENU', choose 'Continuous measuring?'and press 'ENT'. The display shows current

pH and temperature. If the temperature is outside reasonable limits, try to replace the

temperature probe. If the error disappears the old sensor is destroyed.

If not try to recalibrate the instrument, connect a 100 ohm resistor instead of the temperature

probe, choose 'Calibration?' in the main menu and press 'ENT', choose 'Calibration / Low

temperature', press 'ENT', press 'ENT' once more.

Replace the 100 ohms resistor with a 138,5 ohms resistor, choose 'Calibration / high

temperature', press 'ENT' twice.

4.10 Calibration error.

Most often an old and degraded glass electrode causes this error message; try a new one. (See

section 3.3Calibration.) It is notunusual that new electrodes do not work properly.

If you use wrong buffer solutions you will get this warning too.

The cablefrom the glass electrode to the electronic unit is a weaklink: a small shorting, a

little moisture, or if the cable has been stretched, it will be destroyed. Try to replace it with a

new one.


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4.11 Internal wiring diagram

4.12 The electronic unit.

The electronic unit is constructed with very reliable components. If you are suspicious that

there is something wrong, you can check that the operation of the valves is in accordance withthe program (see next page).

If the display is blank the cause may be that there is no power, check the 630 mA fuse on the

110 VAC input, see; section 2.2 to localize it.

4.13 Manual steering of the valves.

It is possible to switch the valves one and off one by one. This is intended as a tool for trouble

shooting and testing of the valves.

Choose Manual steering in the Main Menu.Press 1 to switch on/off (toogle); SV7

Press 2 to switch on/off (toogle); SV6






Press 8 to switch on/off (toogle); Alarm relay


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4.14 Arrangement, wet cabinet.

StepNo.

Action Valves on: Standardtimeseconds

Comments, (locks)

1 Emptyingaftermeasuring

SV1 10

2 Acidsuction

SV7, SV6SV4 openafter 1 s.

maximum35 notadjustable

When the acid reaches the acid electrodes in the acid dosing cell,the program continues with step 3. If 35 seconds passes withoutthe acid reaching the electrodes, the warning message 'No acid'

appears in the LCD, the program then continues with step 3.

3 Acid wash SV3, SV1 3

4 Interval SV1 10

5 (Spraying of

theelectrode)

0 Not used

6 Spraying ofthe cell

SV3, SV1 10 The valves closes if the level electrodes measures that it issolution in the measuring cell SEE 1.7

7 Draining SV1 16

8 Suction ofsolution

SV7, SV6, 240 If the level is reached before 5 seconds has passed the errormessage 'Drain fault' appears in the display, if the level is notreached within 240 seconds the error message 'Suction fault,appears in the display. In both cases the instrument stops.

9 Stabilization 20 If the level in the measuring cell falls below the level electrode

SV7, SV6 and SV5 opens, until the level is reached again10 Measuring 1


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5. Spare parts.

Order

no.

Description Drawing designation. Recommended

number forreserve.

3-1 Valve operator V5 SV1, SV3, SV7 2

3-2 Valve seat V5 SV1, SV3, SV7 2

3-3 Valve operator V42 SV4, SV6 2

3-4 Valve seat V42 SV4, SV6 2

3-6 Acid dosing cell 1

3-7 Ejector 1

3-8 Level electrodes, acid 03-9 Manifold plate 1

3-10 Level electrode, bowl 0

3-11 Bowl 1

3-13 Temperature probe 1

3-14 pH - cable 1

3-15 Pressure regulator 1

3-16 Manometer 1

3-20 Set fittings 0

3-21 Set O-rings 1

3-22 Set diaphragms for V42 SV4, SV6 1

3-23 Set of screws 0

3-32 Electronic unit HIAS-3-PH-

13-S

1

3-27 Spray nozzle SS 1

3-33 Cover and ring 1

3-36 Set of teflon ferrules 1

The recommended number of spares for reserve is per unit in operation. It is a suggestion for

what you should have in stock locally.


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6. Data sheet.

Halland Instruments AS

PH-13-S Automatic pH measuring station PH-13 simplified version

PH-13-S is an automatic on-line pH measuring and cleaning system. The pH is measured intermittently at 1-3minute intervals. The instrument is a complete unit: For sampling, washing of the pH electrode, measuringchamber, dosing and washing of the electrode with a suitable detergent, with an electronic output of 4-20 mAand a Modbus RTU computer interface. This a "back to basics" design, built on 30 years of experience withsampler - proven technology.

Function.The instrument sucks a sample from the process, to a measuring chamber (bowl), where the pH is measured. Thesample is then returned to the process. The instrument then sucks up 19 ml of a suitable detergent from acontainer (container not included). The bowl and the pH electrode are sprayed with this solution. After aninterval the pH combination electrode and the bowl are washed with water, then the water is drained to the

process and then the cycle repeats itself. The instrument is equipped with an air driven vacuum pump (ejector).

Use.

The primary use of this instrument is in automatic process control,where the measured pH is used to control the addition ofchemicals to keep the desired pH value.

Applications.Zinc plants, chemical processing, paper and pulp, food and beverageeffluent treatment, waste water treatment plants, precipitation of

heavy metals in waste water treatment plants, mining and metalplating effluents.

Key features.1. Fast, in nearly every application the measuring frequency is much higher than the disturbances.2. Efficient washing of the electrode increases lifetime of the sensor, and increases the time betweenmaintenance.

3. Unique sampling system, there is no valve between the measuring point and the electrode.4. Very fast and easy to calibrate, using standard buffer solutions, this work takes only 2-4 minutes.5. Sophisticated intelligent monitoring; of measured value and electrode response. The instrument givesdiagnostic messages on faults; if the response of the electrode is abnormal, if the measured value is changing

faster than the time constant of the process or no change at all.6. Diagnostic messages on fault conditions; suction fault, drain fault etc.


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Payback.Your payback will come from process optimizing, and will normally give you: Product quality and high efficient

production, reduced consumption of expensive chemicals. Lower maintenance costs due to longer sensor life

Important design factors.PH-13 is designed to operate with solutions with suspended particles up to 6 mm in diameter, with temperatures

from 0-100 degrees centigrade. The wetted parts are resistant to most acids and bases. The instrument isdesigned to operate in a harsh environment, indoor or outdoor. Designed for high accuracy, reliability and low

maintenance requirements. Simple setup with menu driven push-button programming of measuring range andtimes. The LCD display guides the operator through the setup program.

Technical data.

Water consumption (typ.) 5 liters per hour.Air consumption 100-250 lnper hourAir pressure 3-7 bar

Suction height (from vessel, duct etc to cabinet) 6 meter water column.Detergent consumption (washing freq. is programmable) 10-19 ml/wash.

The container for acid must be placed higher (absolute minimum one meter) than the measuring point.

Water pressure 3-5 bar.

pH range 0 to 14 pH Span 1-14 pHTemperature 0-100 CAccuracy, transmitter 0.01 pH

Power supply 110 or 230 volt ACPower consumption 35 Watts.

Internal tubing TeflonCabinet (two compartment stainless steel) IP 65.Electronic enclosure IP 65.

Outer dimensions 835x480x245 mm.

Weight 29.5 kg.

Outputs:

4-20 mA loop powered, maximum load 950 at 24V dc, linearity and offset error max 0.1 %1 alarm relay, SPCO contacts, rating 8A @ 250V ac/30V dc.

RS485 (Modbus RTU) computer interface (1 start bit, 8 data bits, 2 stop bits, 9600 baud).

All outputs are galvanic isolated from measuring circuits and from each other.

ph analyser manual ph-13-s

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