SENTRYNET 3

CHEMICAL

FLOW CONTROLLER

User Manual

Contents

DESCRIPTION ............................................................................................ 4

FEATURES ................................................................................................... 4

SENTRY TYPES ............................................................................................ 13

Standard Sentry Control .............................................................. 13

Solar Pump Sentry Control .......................................................... 14

FLOW SETTINGS ......................................................................................... 15

K Factor .......................................................................................... 15

Pump Full Scale ............................................................................ 15

Accumulated Flow ...................................................................... 15

CONTROL SETTINGS ................................................................................. 16

Chemical Flowrate SetPoint [SP]................................................ 16

SP Entry ........................................................................................... 16

Pump Full Scale ............................................................................ 16

Control Failure Detection ............................................................ 16

GENERAL SETTINGS .................................................................................. 17

Averaging ...................................................................................... 17

Modbus Address ........................................................................... 17

Chemical Flow Units ..................................................................... 17

Product Flow Units ........................................................................ 18

Notes on Flow Units ...................................................................... 18

USER INTERFACE ....................................................................................... 19

Password Protection .................................................................... 19

Value Entry Types ......................................................................... 19

Numerical Value Entry Procedure ............................................. 19

CAUTION ................................................................................................... 22

MENUS ....................................................................................................... 22

Contents

DETECTING NO FLOW CONDITION ..................................................... 26

HANDLING NO FLOW CONDITION ..................................................... 26

CONTROL METHOD ................................................................................. 27

SYSTEM SETTINGS MENU ACCESS ........................................................... 29

SYSTEM SETTINGS DEFINITIONS ................................................................ 29

Setting Default Values ................................................................. 29

mA Trim .......................................................................................... 29

Input Options ................................................................................. 30

Baudrate & Parity ......................................................................... 30

Sentry Type .................................................................................... 30

Radio Configuration/Radio Diagnostics ................................... 30

DIGITAL COMMUNICATIONS .................................................................. 32

Physical Communication Methods ........................................... 32

Communications Protocol .......................................................... 32

WIRELESS MENUS ...................................................................................... 33

RADIO MENU ACCESS ............................................................................. 33

RADIO CONFIGURATION SETTINGS ....................................................... 33

Please fill-in the information below for tuture reference. .................. 38

IDENTIFICATION ........................................................................................ 38

FLOW SETTINGS ......................................................................................... 38

CONTROL SETTINGS ................................................................................. 38

GENERAL SETTINGS .................................................................................. 39

SYSTEM SETTINGS ...................................................................................... 39

Overview 1

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DESCRIPTION

The SentryNet3 is a programmable flow monitor/controller, which maintains

chemical injection to a product flow stream at the desired rate.

The SentryNet3 controls the chemical flowrate in one of two modes: manual

or automatic. In manual mode, the output to the pump is fixed as a

percentage of the full-scale output of the chemical pump. In the automatic

mode, the flowrate is maintained at the desired setpoint by dynamically

controlling the output to the metering pump.

In automatic control mode, the flowrate setpoint may be entered manually

as a flowrate, or it can be calculated using measurements received from

external transmitters. Two optional 4-20mA transmitter inputs may be

connected: a product flow meter and a chemical analyzer. The product

flow meter measures the flowrate in the uncontrolled product flow stream.

The chemical analyzer indicates the amount of impurities in the product flow

stream. The SentryNet3 then maintains the chemical flowrate required to

neutralize the impurities in the product flow stream.

FEATURES

Controls, measures and displays flowrate from a variety of chemical flow

meters

Flow control based on user settable (manual) or dynamic flow setpoint

Flowrate K factor user settable from 1,000 to 120,000 pulses/gal

Convenient K factor calibration feature

Selectable flowrate units

Setpoints automatically calculated based on remote input signals

4-20mA and relay outputs for chemical feed pump control

Alarm relay output to indicate control failure

Display of chemical flowrate and totalizer

Modbus serial communication options: RS-485, RS-232, Wireless, Ethernet

Safety/failsafe features

Overview

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Sent r y3Fl ow Cont r ol l er

Magnetic Switches(User Interface)

Chemical Flow MeterPump

Chem

ical A

dditiv

e

Antenna(Class 1 Div 1)

Pump Control:4-20mA and Pulse signals

Flowmeter Input

Product Flow

Product Flow Meter(Optional)

Analyzer(Optional)

Communications:ModbusWireless orRS-485

Power:10-30VDC

3/4 NPT CONDUIT FEEDTHROUGH HUBS Figure 1. SentryNet 3 external interfaces

Specifications 2

P 6 / 40

USER INTERFACE

Display 2 line x 16-character LCD with backlight.

User Interface 2 magnetic switches (activated through glass window)

COMMUNICATIONS

Modbus Selectable: RS-485, RS-232, Ethernet, Wireless: Non-

mesh radio, Mesh radio.

Standard COM settings: 9600,N,8,1

FLOWMETER INPUT

Pulses per sec 0 300. Flowrate fullscale depends on the flowmeter K

factor

mA INPUTS

2 x 4-20 mA inputs representing Product Flow and

Analyzer values to automatically set the flow control

setpoint.

CONTROL MODES

Auto Feed forward/feedback control method

Manual User sets control output value from 0 100%.

OUTPUTS / RELAYS

4-20mA and pulse outputs are simultaneously

available to maintain flow control

mA output 0.1% or 0.02mA resolution. Load resistance depends on

supplied power supply voltage.

Relays 2 SPST 3 Amp solid state relays. AC or DC type

available.

Specifications

P 7 / 40

Relay 1: No Flow condition / Loss of Control (normally

energized)

Relay 2: Pump output (solid state relay contacts). Max

pulses per second = 130.

POWER

Volts 10 30 Vdc

Current 130 mA max. @ 12 Vdc

65 mA max. @ 24 Vdc

MECHANICAL SPECIFICATIONS

Enclosure Explosion proof.

Weight 3.75 kg (8.25 lb)

3/4 NPT CONDUIT FEEDTHROUGH HUBS

Figure 2. Top view Figure 3. Front view

ENVIRONMENTAL SPECIFICATIONS

Operating Temp. -20 to 60 C.

Specifications

P 8 / 40

Relative Humidity 90% max. with no condensation.

Installation 3

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IMPORTANT: Shut off power supply for the SentryNet3 prior to electrical hookup.

All SentryNet3 connections are located in the rear compartment of the

enclosure.

Figure 4. SentryNet3 connections (rear view)

+12

VDC

GN

D

GND

D+

D-

Power RS-485

+ - + - + - + - + - + - + - + -

Prod

uct

Fl

ow

Anal

yzer

mA In

Pum

p Co

ntro

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mA Out

Not U

sed

Freq In

Flow

met

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Not U

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Relays

Alar

m

Pum

,p

Contro

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Startup 4

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1. Apply power to the SentryNet3.

2. The initial splash screens will display the S/N and software revision.

3. The optional radio module will be checked. One of following

messages will be displayed:

4. If no radio module is installed:

5. If a meshing radio is installed:

6. If a non-meshing radio is installed:

Checking Radio

NonMesh Radio ok

Checking Radio

No Radio Found

Checking Radio

Meshing Radio ok

Startup

P 11 / 40

7. The main screen is displayed:

8. The top line shows the current chemical additive flowrate and the

setpoint (SP) in the selected flowrate units (quarts per day in the above

example).

9. The second line shows the control output in percent (%) and the

Control Mode: Man = Manual Control, Auto = Auto Control

10. There are three other data screens. Activate the A switch using the

magnet to scroll through each screen.

11. This screen shows the accumulated flow (volume) in the selected units.

The accumulated flow may be cleared at any time [see Configuration

section for details].

12. This screen shows the chemical flowrate. Two values are shown. The

Raw value is the internal flowrate used for control. The Avg value is

for display only it is the average of the last five Raw value readings

for a more stable reading.

13.

14. The final screen shows the setpoint (SP).

Chem Flow (QPD)

Avg 5.0 Raw 4.7

Chem Vol

7.8Qrt

5.0QPD SP 4.5

Out: 53.0% Man

Startup

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Fixed = manually set by user via the magnetic switches.

Ext = set by external input. The value is calculated based on the

input value of Product Flow meter and/or the Analyzer.

The bottom line shows the SP in flowrate units, whether set

manually [Fixed] or by the Analyzer [Ext].

SP:Fixed

= 5 QPD

Definitions 5

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SENTRY TYPES

There are two SentryNet3 types:

Solar Pump

Standard

The main difference between the two types is in the pump pulse control

signals.

The pump type selection is made in the Systems menu, which is not exposed

during field setup. Switching between the two types requires a change in

pumps.

Standard Sentry Control

The Standard SentryNet3 controls the pump by adjusting the strokes per

minute. The on-dwell time is determined by the maximum number of pulses

per minute programmed in the Pump Full Scale section of the Control

Settings menu.

Fixed Dwell [On Time]

1 minute

1 2 25

25 strokes/min@ 50% output

ExamplePump Full Scale = 50 strokes.minOutput = 50%

Figure 5. Standard SentyNet3 pump control pulses

Definitions

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Solar Pump Sentry Control

The Solar Pump SentryNet3 controls the pump by adjusting the dwell time

over a fixed period. The fixed period is field settable. The maximum number

of strokes per minute is 6 and the maximum dwell time for each stroke is 3

seconds.

Variable Dwell1.5 seconds

@ 50% output

1 minute

1

4 strokes/minSet by Pump Full Scale

ExamplePump Full Scale = 4 strokes.minOutput = 50%Dwell time = 1.5 sec. Range = 0 to 3 sec (3 sec max. Dwell Time is fixed)

4

Figure 6. Solar SentryNet 3 pump control pulses

Definitions

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FLOW SETTINGS

K Factor

The K factor is fixed by the flow meter. It is the number of pulses per gallon

generated by the chemical flowmeter. The SentryNet3 accepts values

between 1,000 to 120,000 pulses per gallon.

Although this value is set by the flow meter, the actual value in a particular

installation is affected by external influences such as pressure and fluid type

and so may be different than the value listed by the manufacturer. The

SentryNet3 allows K Factor calibration to trim the value for each application.

Pump Full Scale

This value is determined by the chemical pump. It equals the actual

maximum flowrate the pump is capable of in a particular installation. Factors

such as pressure can affect the pump full scale. The Pump FS value is used in

the automatic control mode to calculate the initial control output value

setting.

Accumulated Flow

The chemical output is totalized and saved by the SentryNet3. It is displayed

in the units selected and may be cleared at any time.

Definitions

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CONTROL SETTINGS

Chemical Flowrate SetPoint [SP]

The SP is the desired chemical flowrate value to be maintained by the

SentryNet3 in the automatic control mode. It is either specified directly in the

selected flowrate units or it is automatically and dynamically set by data

from external transmitters: Product Flowmeter and/or Analyzer.

SP Entry

If neither a Product Flowmeter nor an Analyzer are configured, then the

SentryNet3 will prompt for the SP in the selected flow units e.g., Quarts per

Day (QPD).

If an Analyzer, but no Product Flowmeter is configured, then the SentryNet3

will:

Read the chemical addition ppm value from the Analyzer

Prompt for a fixed Product Flowrate value

Calculate the chemical flowrate SP: (ppm * Product

Flowrate)/1000,000

The entered Product Flowrate is assumed to be a contant.

If a Product Flow meter, but no Analyzer is configured, then the SentryNet3

will:

Prompt for a fixed chemical addition ppm value

Read the flowrate from the Product Flowmeter

Calculate the chemical flowrate SP: (ppm *

ProductFlowrate)/1000,000

Pump Full Scale

This value sets the maximum pump control output range in strokes per

minute. See the start of this section [SENTRYNET TYPES] for details.

Control Failure Detection

The SentryNet3 will activate a Control Failure alarm [activates Alarm Relay] if

the chemical flowrate (or Process Variable: PV) deviates from the SP by more

Definitions

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than the Alarm Tolerance [entered in percent] for at least the Alarm Time

Delay. The Alarm Tolerance and Alarm Delay are field settable.

GENERAL SETTINGS

Averaging

Averaging is only used by the Standard SentryNet3.

The Standard SentryNet3 uses relatively high pump strokes, producing bursts

of pulses from the flowmeter. Averaging is used to smooth out the

calculated flowrate from the flowmeter pulses.

The Solar Pump version of the SentryNet3 counts pulses over the relatively

long pump stroke cycle [typically 1- 2 strokes per minute] and due to this

synchronization, is relatively immune from flow fluctuations.

Modbus Address

The SentryNet3 functions as a Modbus slave. It is accessible by an external

Modbus master via the following communication methods:

Wireless in a meshed network. An optional Meshing radio must be

installed.

Wireless in a non-meshed network. An optional non-meshing radio

must be installed.

RS-485

RS-232

Selection between the methods is via hardware configuration. In all cases, a

Modbus slave requires a unique Modbus Address to distinguish it from other

slaves in a communications network.

Chemical Flow Units

The chemical flowrate may be displayed in a number of units:

QPD (Quarts per Day)

LPD (Litres per Day)

GPD (Gallons per Day)

The accumulated flow units are automatically adjusted based on the

chemical flowrate units i.e., quarts, litres, gallons.

Definitions

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Menu prompts will automatically use the selected units.

Product Flow Units

The Product flowrate may be displayed in a number of units:

GPD (Gallons per Day)

BPD (Barrels per Day)

Notes on Flow Units

The SentyNet3 uses GPD and gallons as primary units.

Flow and volume are converted to selected units such as LPD, QPD,

and BPD only for display and for value entry. Once a value, such as

the Setpoint, is entered in the selected units, it is converted and saved

as GPD. Flow and volume values in selected units are not held in

memory, but converted only when necessary.

All flow and volume related values acquired via Modbus (digital

communications/network) are in GPD or gallons, respectively.

User Interface 6

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USER INTERFACE

Menu navigation and configuration are performed using two magnetically

activated switches labeled A and B.

In the text below, pressing a key refers to the following sequence of actions:

1. Start with the magnet at least one inch vertically above the desired

magnetic switch

2. Then bring the magnet straight down to touch the glass window to

activate the switch

3. After value entry, lift the magnet vertically up and away from the switch.

The above procedure ensures only the desired switch is activated.

The A key is typically used to select the next menu item while the B key is

used to confirm entry.

Password Protection

Configuration values are password protected against inadvertent

modifications.

Information may be viewed without restriction, but the password entry screen

is activated as soon as an attempt is made to change a value.

Value Entry Types

There are two kinds of value entries:

Numerical

Selection between multiple states

Numerical values may only be entered within an allowed range. If the value

is not within the range, the entered value is cleared to the minimum or the

maximum value is displayed and the entry procedure is restarted.

Numerical Value Entry Procedure

This procedure applies to the entry of all numerical values, including the

password.

User Interface

P 20 / 40

The current value is displayed and the cursor flashes over the most

significant digit.

To accept the value without making any changes, press and hold the

B key until the value entry screen is exited.

To change the current digit, press the A key repeatedly. The digit value

will increase to 9 then roll over to 0.

Press the B key to advance to the next digit.

Repeat the above two steps until all digits are set as desired.

If the entered value is not within the allowed limits, the entered value is

cleared and value entry is restarted.

M

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A AA

Hold for 3 Seconds Main Menu

General Settings

Averaging

Modbus Address

B

Chem Flow Units

Product Flow units

Exit

A

A

A

A

Main MenuControl Settings

SetPoint

Pump FS

A

B

Control Fail Set

Exit

A

A

Main MenuFlow Settings

K-Factor

K-Factor Trim

A

B

Chem Flow FS

Exit

A

A

A

A

Main Display Screen

Chem Volume

Chem Flow

A

SetPointValue

B

ControlMode:Man

B

B

B

BSet Out%

A

ControlMode:Auto

B

AB

B

B

Clear Accum Flow

A

B

SentryNet 3 Programming Menu Flow Chart

A

A

A

Main MenuDiagnosticA

Pulses: Freq:

Pulse/StrkCount/strk

B

PFlow%Analyzer%

Exit

A MainMenuExit

B

A

B

Configuration 8

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CAUTION

This section assumes the reader has read through the Definition section.

Only qualified personnel should attempt to modify the configuration values.

Improper settings can cause instrument failure and/or damage.

MENUS

The configuration setting flowcharts are detailed in the following pages. They

should be used in conjunction with the Definitions and User Interface sections.

C

onfig

uratio

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0 "A" to toggle up and "B" to accept move to next digit

Flow SettingsMain Menu

Flow Settings

B

To Determine this value operate the pump at 100% output and use value displayed

after system is stable. The units QPD,LPD,or GPD are set in the General

Settings Menu

The number of pulses per gallon generated by the chemical flow meter. This number can be manually set or determined

by following the proceedure in the K-Factor Trim section below

Flow Settings K-Factor:

Flow SettingsK-Factor Trim

A

A

K-Factor:pls/gal13900

B

K Trim: Test mL =10

B

B B K Trim: Out %=0

K Trim: ReadyB=YesB

K Trim: PumpingPumped: 0mL B

Flow SettingsChem Flow FS

Flow SettingsExit

A

Flow SettingsClear Accum

Flow

A

B Chem Flow FS: QPD100 B

B Clear Total FlowB=Clear B

B=Flow DonePumped: XXXX

K Trim: Real mL=XXXX BB

B

B

See expanded explaination in manual under Chemical meter calibration

Used to reset the total volume of chemical

pumped to zero

C

onfig

uratio

n

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0

This paramater only pertains to pumps driven

by the relay output-settings can be from 1 to

120

This value can be entered manually or calculated by the Sentry based on the

analog inputs. The units of volume are determined by

a setting in the General Settings Menu

Control Settings

The default allows the actual flow rate to be over or under the current Set

Point by 25% for 60 seconds before triggering

analarm

Main MenuControl Settings

Control SettingsSet Point

Control SettingsPump FS

A

Control SettingsControl Fail Set

A

A

Set Point: QPD4

B

PMP FS: Strks/Min10

B

B B

Control SettingsExit

B Cont Fail:Tolrnc%: 25 BCont Fail:Delay

sec: 60 B

B

B

"A" to toggle up and "B" to accept move to next digit

C

onfig

uratio

n

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0

The number of pulse counts required to update

the display and control functions

They unquie number address for this unit if on a communication network. Number between 1 and

255

The units of volume desired for displaying

chemical totals and flow rate. QPD-LPD-GPD use

A to toggle

The units of volume desired for displaying product flow rate. BPD-GPD use A to toggle

General SettingsMain Menu

General Settings

B

General SettingsAveraging

General SettingsModbus Address

A

General SettingsChem Flow Units

A

A

500B

255

B

B B

General SettingsProd Flow Units

A

B Chem Flow: QPDSet to: QPD B

B Prod Flow: BPDSet to: BPD

B

General SettingsExit

B"A" to toggle up and "B" to accept move to next digit

Reference 9

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This section describes features and utilities of the SentryNet3 not detailed in

the previous sections.

DETECTING NO FLOW CONDITION

If flowmeter pulses are not received for two minutes, then a No Flow

condition is flagged.

If a No Flow condition is active when Chemical flowrate is required, then a

No Flow Alarm is activated.

Note: Chemical flowrate is required when the control mode is in the Auto

mode and the Chemical flowrate is not at the desired Setpoint.

HANDLING NO FLOW CONDITION

This feature is always turned on and is not selectable.

When a No Flow Alarm or Control Failure (See Control Definitions section) is

first detected, the control output value is captured and saved. The pump

control output is slowly ramped up to try and revive the pump. If this action

does not succeed, then the output is forced to and maintained at the

previously captured output. Here are the details:

In the event of a pump not working, or temporarily stalled (?), the SentryNet3

will detect a No Flow Alarm or a Control Failure. At this point, the following

sequence is initiated:

1. The current control output value is stored i.e., pump on at 45%

2. Every 30 seconds, the pump output is ramped upward in an effort to bring

the flow back from 0.

3. If there is still no flow for 2 minutes, then the output is forced to the stored

value recorded when the No Flow condition was first detected.

4. A No Flow alarm is now latched: the Alarm Relay is activated. A latched

condition can only be reset by cycling the power to the SentryNet3.

5. The control mode is left in AUTO mode.

Reference

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CONTROL METHOD

The SentryNet3 maintains the chemical flowrate to the desired Setpoint by

pump control.

If the Setpoint changes (see below) by more than 5%, then the pump output

is recalculated (see below). If not, then the output is gradually ramped up or

down to maintain the desired chemical flowrate Setpoint.

Setpoint changes may be made either in static mode by the user or

dynamically by an external Product flowmeter / Analyzer (See Control

Definitions section).

The pump output is recalculated based on the pump fullscale (Chem Flow

Fullscale see Flow Definitions section) and the desired Setpoint.

Pump output percent = 100 * (Setpoint/Chem Flow Fullscale)

D

iagn

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0

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.

Diagnostics Menu

All Items in this menu are read only and are

displayed for information and troubleshooting

purposes.

This item is only displayed when the Sunpump type is selected in the Sentry Type item in the System

Settings Menu

This item only appears when either a product flow meter and/or analyzer is selected in the Input Options item in the system settings menu. Only the

activated input(s) will display

Main MenuDiagnostics

DiagnosticsPulses:Freq:

DiagnosticsPulses/Stroke:Counts/Stroke:

A

DiagnosticsProd Flow %:Analyzer %:

A

A

DiagnosticsExit

B

B

"A" to toggle up and "B" to accept move to next digit

Displays pulses accumulated this cycle and the frequency of the last cycle of

pulses-this will "roll over" at the number of pulses set in the Averaging setting of

the General menu

System Settings 11

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WARNING

SentryNet3 System settings are not available for field modification. They affect fundamental parameters, which must only be modified by qualified users.

See the end of this section for the Systems Settings menu flowchart.

SYSTEM SETTINGS MENU ACCESS

1. From any of the Display screens, press and hold the A key for 3 seconds to

enter the Flow Settings screen.

2. Press the A key two times to display the General Settings screen option.

3. Press the B key to enter the General Settings screen.

4. Press the A key repeatedly to display the General Settings Exit screen.

5. Press and hold the B key for 3 seconds at the General Settings Exit screen

to display the hidden System Settings screen.

SYSTEM SETTINGS DEFINITIONS

Setting Default Values

This setting forces factory default values to Flow, Control, General, and

System settings. These values will overwrite existing values so Setting Defaults

must be used with caution.

mA Trim

This procedure is performed once at the factory and is not typically required

to be performed again.

The mA output is affected by electronic component tolerances. This

procedure trims the mA output by calculating the correction factor. The

SentryNet3 will force the output to 20 mA. The user must measure the actual

output using a mA meter and enter this value. The SentryNet3 will then

calculate the new correction factor.

System Settings

P 30 / 40

For example, 19.85 mA may actually be measured instead of 20. If you enter

this value at the prompt, the SentryNet3 will recalculate the mA trim.

Input Options

See Chemical Flowrate Setpoint definition in the Control Settings Definitions

section.

This menu sets whether or not a Product Flowmeter and or Analyzer is

connected to the SentryNet3. These external devices affect how the

chemical flowrate Setpoint value is calculated.

Baudrate & Parity

Baudrate and parity are settings used for digital communications.

This menu is used only if a radio module is not installed. Radios use fixed

baudrate and parity values.

Sentry Type

See Sentry Types in the Definitions section. Either the Solar Pump or Standard

SentryNet3 may be selected. This setting must be matched by application

hardware such as pump types and should not be changed unless the

hardware is compatible.

Radio Configuration/Radio Diagnostics

These menus are only available if a radio module is detected. See the Radio

section for details.

Syste

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0

System Settings Without RadioMain Menu

System Settings

System SettingsSet Defaults

System SettingsTrim mA Output

A

System SettingsInput Options

System SettingsExit

A

A

Set DefaultsA=Abort B=OK

B

Trim mA OutmA=20.00

B

B B

System SettingsBaud Rate/Parity

A

BInput Options

Prod Flowmetr=No B

BBaud Rate/Parity

Baud=9600 B

System SettingsSentry Type

A

Baud Rate/ParityParity=None B

Input OptionsSentry=Standard

Input OptionsAnalyzer=No B

B B

B

B

"A" to toggle up and "B" to accept move to next digit

Used to set unit to factory defaults

Used to adjust the SN3's 4 to 20mA output for fine

tuning with field equipment

Used to select the type of input that is to be used as

a pacing source

Used to set the baud rate and parity of the

communications port-this will not be visible if the

SN3 detects an on board radio

Used to set the operation mode

Communications 12

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DIGITAL COMMUNICATIONS

Digital communication requires two independent specifications:

Physical communication method

Communications protocol

For example, in a telephone conversation, the physical communication

method is the telephone system, and the protocol is the language spoken.

One physical method may support many protocols and vice versa.

Physical Communication Methods

The SentryNet3 supports the following physical communication methods:

RS-232 (3 wire: Transmit, Receive, Ground)

RS-485 (3 wire: D+, D-, Ground)

Ethernet (wired)

Wi-Fi (wireless Ethernet)

Non-mesh Radio (transparent or wire replacement mode)

Mesh Radio (multiple SentryNet3 units route messages in a wireless

network).

Communications Protocol

The SentryNet3 supports the Modbus protocol. Modbus is a Master Slave

protocol where there is a single network master and multiple network slaves.

Slaves and master are connected in a network using one of the physical

communiation methods listed above. Slaves only reply when queried by the

master.

The SentryNet3 is a Modbus slave.

Each SentryNet3 on a network must have a unique number called a Modbus

Address. This address must be set prior to connecting a SentryNet3 to a

network. Multiple SentryNet3s with the same Modbus Address will cause

communication errors.

Wireless Radio 13

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WARNING

A radio module must be installed to enable wireless communications.

Radio configuration values are intended to be fixed for most applications. Changes must be made throughout the network and NOT on an individual basis.

WIRELESS MENUS

There are two radio menus:

Radio Configuration Settings [see warning above]

Radio Diagnostics [these are for display only]

RADIO MENU ACCESS

The two radio menus are the final 2 entries in System Settings. See the

flowchart below. The radio menus are only visible if a radio module is

installed.

RADIO CONFIGURATION SETTINGS

Parameter Description Value

PL Transmit Power Level.

0 = 1 mW

1 = 10 mW

2 = 100 mW

3 = 500 mW

4 = 1 W

4

DH Destination High Address

This is only required for mesh radio applications.

The value must match the Source High Address of the Modbus

master

varies

DL Destination Low Address

This is only required for mesh radio applications.

The value must match the Source Low Address of the Modbus

master

varies

HP Hopping Channel 3

ID Network ID 1222

NH Network Hops

Sets the maximum number of hops expected in a network route

7

Wireless Radio

P 34 / 40

NN Network Delay Slots 3

NQ Network Route Requests 3

NR Network Retries 1

W

ireless

Radio

P 3

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0

System Settings With Meshing RadioMain Menu

System Settings

System SettingsSet Defaults

System SettingsTrim mA Output

A

System SettingsInput Options

System SettingsExit

A

A

Set DefaultsA=Abort B=OKB

Trim mA OutmA=20.00

B

B B

A

B Input OptionsProd Flowmetr=No B

BSystem Settings

Sentry Type

A

BInput OptionsSentry=Standard

Input OptionsAnalyzer=No B

B

B

B

"A" to toggle up and "B" to accept move to next digit

Used to set unit to factory defaults

Used to adjust the SN3's 4 to 20mA output for fine

tuning with field equipment-see manual for

proceedureUsed to select the type of input that is to be used as

a pacing source

Used to set the operation mode

System SettingsRadio Config B

System SettingsRadio Diag

A

See:Mesh Radio Config page

VB:0:00 Temp:00RSS: 0

GD: 0 ER: 0 TR: 0

HV:0000 VR:0000 SH:00000000SL:00000000 A

A

A A A A

W

ireless

Radio

P 3

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0

Meshing Radio Config PageSystem Settings

Radio Config

Radio ConfigSet Defaults

Radio:Dest AddrDH:00000000

A

Radio:Dest AddrDL:00000000

Radio:Net HopsNH:07

A

A

Set DefaultsA=Abort B=OKB B

B

A

B

B

BRadio:Tx Pwr LvlPL:4

A

B

B

B

B

"A" to toggle up and "B" to accept move to next digit

Radio:Hopping ChHP:3

B

Radio:Net AddrID:1222

Radio:Net delNN:03

Radio:Net Rt Req

NQ:03

Radio:Net RetryNR:01

Radio:Diag Freq003

A

A

A

A

A

A

A

A

A

A

B

Troubleshooting 14

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CONDITION REMEDY 1.

2.

Settings Sheets 15

P 38 / 40

Please fill-in the information below for tuture reference.

IDENTIFICATION

Checked by

Model Number

Serial Number

Hardware Rev.

Software Rev.

FLOW SETTINGS

PARAMETER DESCRIPTION FACTORY

SETTING

USER

SETTING

K Factor Flowmeter output: pulses per gallon 13,900

Chem Flow Full

Scale

Maximum flowrate capability of the

chemical addition pump

25 (GPD)

CONTROL SETTINGS

PARAMETER DESCRIPTION FACTORY

SETTING

USER

SETTING

Control Mode Automatic or Manual [Fixed] Manual

SetPoint [SP] Desired chemical flowrate 1.0 (GPD)

Pump Full Scale Maximum pump output range in strokes per

minute

30 strks/min

Alarm Tolerance Control Failure Detection: The SentryNet3 will

activate a Control Failure alarm if the

chemical flowrate [or Process Variable: PV]

deviates from the SP by more than the Alarm

25 %

Settings Sheets

P 39 / 40

Tolerance [entered in percent] for at least

the Alarm Timedelay

Alarm Delay See Alarm Tolerance 60 sec.

GENERAL SETTINGS

PARAMETER DESCRIPTION FACTORY

SETTING

USER

SETTING

Averaging Only used by the Standard SentryNet3 [not

the Solar Pump version]. The number of

samples per average to smoothen out the

calculated chemical flowrate

500

Modbus

Average

Unique Network Address for each slave

device in a Modbus network

1

Chemical

Flowrate units

Chemical flowrate units used for display, and

configuration [e.g. entering the SetPoint]

QPD

Product Flowrate

Units

Product flowrate units used for setting the

SetPoint.

BPD

SYSTEM SETTINGS

PARAMETER DESCRIPTION FACTORY

SETTING

USER

SETTING

Input Options Product Flowmeter Installed

Analyzer installed

No

No

SentryNet3 Type Standard or Solar Pump version Standard

Comm Settings Baud rate

Parity

9600

None

Product Flowrate

Units

Product flowrate units used for setting the

SetPoint.

BPD

Contacts 16

P 40 / 40

For additional technical support, contact:

(Provide physical address, email, phone and fax number)