Ultra Sonic Compact Heat Meter

F90UDE-13-MI004-PTB001

2

ContentGeneral Information 3

Operation (Display And Readout-Loops) 4

Error Codes And Error Descriptions 6

Dimensions 7

Installation Heat Meter8

Temperature Sensor Installation 9

Example heating circuit with mixing valve 10

Example heating circuit with throttle valve11

Wall Bracket Installation 12

Interfaces And Options 13

Optical Infrared Interface 13

M-Bus Interface 13

Pulse Output 14

Radio Interface Wireless M-Bus OMS 15

Pulse Inputs 17

Tariff Registers 18

Data Logger 19

Specifications F90U20

EC-Declaration Of Conformity F90U (US2) 23

3

General InformationThis manual does not contain basic installation procedures and is therefore intended for trained service personnel onlyAll installation and maintenance work shall only be carried out by qualified and authorized personnel

ImportantThe seals on the meter must not be damaged! A broken seal results in an immediate loss of factory warranty and a void calibrationThe operator of the meter is responsible and liable that the meter is instal-led and operated according to national laws, standards and regulations

- Temperature sensor cables must not be shortened, kinked or altered in any other way

- Applicable standards for the use of heat meters: EN1434 (Part 1 and 6), Directive 2004/22/EC (Annex I and MI-004) and the relevant calibration regulations of the country in which the heat meter is used

- The operator of the heat meter is responsible for complying with the legal requirements

- Heat meters are calibrated for a period of 5 years After expiration, they need to be replaced by devices with a valid calibration

- The F90U complies with the general requirements of the European Council Directive EMC 2004/108/EC on electromagnetic compatibility for equipment Regulations on electrical installations must be observed

- The longevity of the heat meter can only be guaranteed if the water quality meets the conditions of AGFW-Recommendation FW-510.

- Make sure that heat meters are stored and shipped under frost-protected conditions

- Electrical wiring must be installed at a minimum distance of 50 cm to elec-tromagnetic interferences (switches, controllers, pumps, etc) and at a dis-tance of at least 10 cm to other power cables

- The location of the heat meter (hot or cold strand) and the flow direction must be observed

- The F90U is designed for the use with water as a heat conveying medium only Additives or impurities are not allowed because they can distort mea-surement results or damage the flow sensor

4

Operation (Display And Readout-Loops)

The F90U has a liquid crystal display with 8 digits and additional special characters The measured and stored values are summarized in three readout-loops All data can be read out by pressing the display-key

The accumulated heat energy since commissioning is shown in the main loop (loop 1) by default

You can toggle between three given loops by pressing the display-key for more than 4 seconds The current loop is indicated by the loop number on the lower rim of the display (only loop 2 and 3) Hold the display-key pres-sed until the desired loop number appears on the display

Within a loop you can toggle between different stored values by briefly pressing the display-key

When the display-key is not pressed within a minute, the F90U switches back to its default display

The adjacent table gives you an overview about possible readouts within each loop

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Main-LoopLoop 1

Accumulated energy in MWh since commissi-oning

Display-Check

Last annual reporting date1) alternating with the amount of consumed energy

Accumulated volume in m³ since commissioning

Current output in kW

Current flow rate in m³/h

Current date

Error codes (alternating between binary and hexadecimal values)

Tariff register 1: Value alternating with tariff and criteria2)

Tariff register 2: Value alternating with tariff and criteria2)

Only for devices with two pulse inputs:

Current meter reading pulse counter 1 alternating with pulse value2)

Current meter reading pulse counter 2 alternating with pulse value2)

Technics-LoopLoop 2

Maximum output in kW

Maximum flow rate in m³/h

Temperature in hot strand in °C

Temperature in cold strand in °C

Temperature difference in K

Operating days since calibration

Temperature sensor type and mounting position of flow sensor

M-Bus-Address

Serial Number

Firmware- / Software-version

Statistics-LoopLoop 3

Penultimate annual reporting date1) alterna-ting with the amount of consumed energy

Monthly reporting dates alternating with the amount of consumed energy. F90 always displays the last 15 monthly reporting dates Selectable by pressing the display-key1)

1) The meter shows a zero for reporting date and energy until the last day of the year or month has passed

2) Can be set via software (for this a meter-speci-fic password is required).

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Error Codes And Error DescriptionsIf the meter detects an error, it will indicate the error icon ! on its displayThe distinct error code can be read out in the main loop (loop 1)The error code alternates between binary and hexadecimal valuesWhen an error other then error code 10 occurs the heat meter has to be replaced

Error Codesbinary hexadecimal

Description

0000 0001 01 Defective red sensor (high temperature)

0000 0010 02 Defective blue sensor (low temperature)

0000 0100 04 Defective reference sensor

0000 1000 08 Defective sensing coil

0001 0000 10 Reset

0010 0000 20 Defective EEPROM

0100 0000 40 Checksum error

1000 0000 80 Low battery

Error Effect Cause01 There won‘t be any calculations

carried out Registers for volume and energy won‘t be changed

Defective sensor or sensor-cable

02 cf error 01 Defective sensor or sensor-cable

04 cf error 01 Defective calculator

08 cf error 01 Air in flow sensor, faulty volume sensing or damaged connection cable between calculator and flow sensor

10 Data loss Voltage overload (EMP)

20 Heat meter without function Defective calculator

40 cf error 01 Defective calculator

80 No effect on calculation Undue environmental conditions (temperature, usage, etc)

7

Dimensions

Qp 0,6 1,5 2,5 3,5 3,5 6,0

L 110 110 130 130 150 260

D 3/4” 3/4” 1” 1” 5/4” 5/4”

H1 88 88 87 87 89 94

H2 68 68 68 68 68 70

H3 40 40 40 40 40 42

H4 30 30 30 30 30 33

Qp = Nominal flow rate in m³/hL = Overall length without screw joint in mmD = Connection threadH1 = Overall height heat meter in mmH2 = Height from tube axis in mmH3 = Height flow sensor in mmH4 = Height stop latch in mm

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Installation Heat Meter - Flush pipes thoroughly prior to installation of the heat meter. - Only install a dirt sieve if you can ensure it is installed in a sufficient dis-

tance to the F90U because it can cause disturbances in the flow. If you are unsure or cannot get reasonable results from the meter, do not install a dirt sieve or remove an existing one

- The heat meter must not be installed on a pump suction side - To avoid malfunctions and pressure surges due to aggregated air, install

the heat meter at the lowest point possible. The F90U must be installed in a frost-free environment

- Close the ball valves, release the pressure and empty the pipes - Unscrew the screw joints of the old heat meter, remove the old gaskets

and clean the sealing surfaces thoroughly - Install the F90U, tension-free and with new gaskets, in either the low or

the high temperature pipe according to the data on its type plate Please note that the heat meter must be installed streamwise, indicated by an arrow on its flow sensor

- Fill the pipes slowly and carefully after installation to protect the heat me-ter from being damaged by pressure surges

- Make sure that the heat meter is always filled with water - Protect the meter against manipulation by affixing the enclosed seals

flow (high temperature)

return(low temperature)

supply temperature sensor

heat meter with built-inreturn temperature sensor

ball valve with sensor socket M10x1

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Temperature Sensor Installation - The temperature sensors are marked with colored type labels, red for

installation in the high temperature strand and blue for installation in the low temperature strand

- With the F90U one of the two sensors is pre-installed. Which one de-pends on the type of the heat meter (installation in cold or hot temperature strand); cf type label Normally the blue labelled sensor is pre-installed in the flow sensor and secured with a seal

- The free temperature sensor (normally the red one) can be installed into a ball valve with sensor socket or a T-piece-adapter with a M10x1 thread

- According to EN1434-2 it is recommended for pipe sizes ≤ DN25 to install temperature sensors only direct immersed, without using a pocket

- The temperature sensor has to be secured against manipulation with a seal The connecting cables must not be shortened or lengthened

- Close the ball valves, unscrew the screwcap of the old temperature sen-sor and remove it

- Remove old O-ring and make sure not to leave any residues - Pull off the O-ring and adjust the new temperature sensor to the required

depth so that the tip of the sensor does not touch the bottom of either the ball valve or the T-piece Set the depth adjustment to the correct beading of the sensor sleeve and insert the O-ring into the sensor socket of the ball valve

- Insert the temperature sensor into the sensor socket and tighten the screwcap

- Finally check for leakages and protect the meter against manipulation by affixing the enclosed seals

ball valve sensor socket M10 x 1 mm

O-ring

sensor sleeve screwcap

depth adjustment

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Example heating circuit with mixing valve

Consumer

A

B

AB

ReturnSupply

M

000

∑ kWh

000

∑ m3

Measurement of return temperature:Downstream installation of returntemperature sensor in order to avoiddisturbences in flow profile andto minimize the error in temperaturemeasurement.

Faulty measurement ofsupply temperature be-cause of wrong place-ment of temperature sensorin mixing zone of 3-waymixing valve

000

∑ m3 Flow sensor

3-way mixing valve

ABA

M

B

000

∑ kWhCalculator

Temperature sensor

Pump

wrong placement oftemperature sensor

Key (EN 12792 / EN 806-1 / DIN 2481)

Never install flow meter on a pumpsuction side in order to avoid cavi-tation or flashing in the flow meter.

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Example heating circuit with throttle valve

Supply Return

000

∑ kWh

000

∑ m3

Heatexchanger

Consumer

∆p < 1 bar

000

∑ kWh000

∑ m3Calculator Flow sensor

Temperature sensor

Pump

Key (EN 12792 / EN 806-1 / DIN 2481)

Differential pressure control valve

2-way seated valve

Placement of flow sensor and returntemperature sensor upstream of theseated valve and the differentialpressure control valve in order toachieve a smaller difference inpressure than the recommendedmaximum value of e.g. 1 bar at10 K temperature difference(according to PTB TR K9, annex C).

Always install control valves down-stream of flow meter in order to avoidcavitation or distortion of flow profile.

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Wall Bracket InstallationThe calculator can be removed from the flow sensor and mounted onto a wall with the enclosed wall bracket. It should be installed above the flow sensor if possible Please consider that the display must be readable and accessible without tools at all timesWall bracket and adhesive pad are enclosed accessories to the F90U.

MountingPush the latches on either side of the heat meter gently together with one hand and lift the calcula-tor out of its bracket Make sure not to damage the connecting cable between the flow sensor and the calculator

The wall bracket can be mounted on a wall either with screws and dowels or with the included adhesive pad Snap on the calcu-lator onto the wall bracket subsequent to the installation of the wall bracket

To remove the calculator from the wall bracket turn it slightly clockwise or counter clockwise and then pull it toward the front

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Interfaces And OptionsOptical Infrared Interface (standard)The F90U can be read out and configured with an opto-coupler and additional software via its optical infrared interface (protocol: M-Bus, baud rate: 2400 Bd) The infrared interface can be activated by pressing the display-key It switches back to idle mode again, if neither a valid telegram is received nor the display-key is pressed within 60 seconds

M-Bus Interface (option)F90U can be provided with an optional M-bus interface. The valid standards for the M-Bus protocol are EN13757-2, EN13757-3, EN1434-3 and the M-Bus recommendation (version 48) with the basic standard IEC870 parts 1, 2 and 4Please consider that the maximum admissible operating power (± 42V) must not be exceeded when the heat meter is connected to a M-Bus network Precautions against overvoltage have to be carried out on the side of the level converter The topology of the M-Bus network has to match the requirements (cable length, cable gauge) of a network for baud rates of 2400 BdRecommended cable: telephone cable J-Y(ST) Y2 x 2 x 0,8 mm2

The M-Bus interface is galvanically isolated and non-reactive. The F90U can neither be supplied via M-Bus nor be connected to an additional power supply The number of readouts via the M-Bus interface depend on the number of meters in the network

Number of meters Readouts per dayprimary address

Readouts per daysecondary address

3 655 27520 485 17060 300 90120 190 52250 105 27

If less readouts are carried out or less heat meters are connected to the network, the unexploited amount of available readouts will be accumulated over a period of 8 days and stored in the device for future use The cons-traint of readouts is due to match the lifetime expectancy of the built-in bat-tery Please note that, for battery-powered meters, you should only perform readouts as rare as possible and as often as needed

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Pulse Output (option)The potential-free pulse output, which emits counting pulses of the heat meter, is an electronic switch for versatile use (class OA, according to EN1434) The switch closes, corresponding to the pulse value (cf type label), for a period of 125 ms If the heat meter emits more than one pulse during a measurement the idle time between two pulses is 125 ms

Technical data pulse outputPulse value: energy (standard), 1kWh/p volume (option), 100 l/pMax switching voltage: 35 V ~/=Max switching power: 300 mWMax current: 120 mAResistance of contact insulation: >109 OhmMax contact resistance (On): 25 OhmContact capacity: 1,5 pFDielectric strength (Off): 350 V ~/=Pulse length: 125 msIdle time between two pulses: 125 ms

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Radio Interface Wireless M-Bus OMS (optional)

The F90U can be equipped on demand with a wireless M-Bus radio interfa-ce (OMS) according to EN13757-4

Radio frequency: 868 MHzTransmission power: up to 25 mWProtocol: wireless M-Bus (EN 13757-4)Operation mode: either T1, S1Telegram: - short (stationary readout) - long (walk-by readout)

The clock of the heat meter is factory-set to winter time (GMT + 1) Please note the following conditions for setting the time span in which the heat meter transmits:If radio transmission shall be active between 07.00 h and 19.00 h the F90U has to be set as described below If set during winter time Transmission On at: 0700 h Transmission Off at: 1900 h If set during summer time Transmission On at: 0800 h Transmission Off at: 2000 h

Configuration and commissioningThe radio interface of the F90U is standardly deactivated ex factory and thus has to be activated after installation of the heat meter as follows:

a) Without additional software and opto-coupler: The radio interface can be set into operation mode by selecting „M-Bus address“ from technics-loop (see page 27) and then pressing the display-button for more than 3 seconds With this the factory settings will be loaded

b) With additional software and opto-coupler: Please refer to the manual which comes along with the software

After succesfull activation of the radio interface a black triangle will ap-pear permanently at the lower rim on the left side of the display

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q

Hint:Please choose the location of the F90U with radio interface thoroughly. Don‘t install it between or behind pipes to avoid a loss in signal strength Also devices such as WLAN-Routers, remote controls, baby monitors, etc and especially the structure of buildings can significantly weaken the radio signal of the heat meter

Parameter values radio interface

Parameter Possible settings(only via software) Factory settings

Transmission mode S1 / T1, unidirectional T1 unidirectionalTime span 0000 - 2400 h 0700 - 1900 h

Transmission intervall 120 seconds to240 minutes 120 seconds

Weekdays Monday - Sunday Monday - FridayWeeks 1 - 4 (5) 1 - 4 (5)Months 1 - 12 1 - 12Date of activation 0101 - 3112 not set

AES-Encryption

encrypted: - master key - random key per meter

decrypted

encrypted: - master key

Type of telegram short telegramlong telegram long telegram

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Two Pulse Inputs (optional, only together with M-Bus or radio interface)The F90U with with M-Bus or radio interface can be equipped on demand ex factory with two additional pulse inputsIn this case up to two additional meters (water meter, gas meter, electricity meter, etc.) can be connected to the F90U.

Pulse length: ≥ 100 msPulse frequency: ≤ 5 HzSource current: ≤ 1.5 mAResistance: ≥ 6 MΩ (open switch) ≤ 3 kΩ (closed switch)Connection cable: 1 m

The pulse inputs can be configured via the software DeviceMonitor. Pos-sible settings are the pulse values (1 - 25 - 10 - 25 - 100 - 250 - 1000), the corresponding unit (l/p - kWh/p - none) and the counter values of the connected metersPlease pay attention to the correct polarity when connecting external de-vices to the F90U (not necessary for reed-relays). The pulse inputs react on short circuits and assess them as valid pulses from an external device Therefore please ensure that the cable-ends don‘t touch each other

Cable color Allocationwhite IE 1 (+)

brown IE 1 ()

green IE 2 ()

yellow IE 2 (+)

grey M-Bus

pink M-BusTable: Allocation 6-wire cable (only with M-Bus)

Cable color Allocationyellow IE 1 (+)

green IE 1 ()

brown IE 2 ()

white IE 2 (+)Table: Allocation 4-wire cable (only with radio interface

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Tariff RegistersThe F90U has two tariff registers in which energy or time can be accumu-lated on certain criteria These criteria are individually adjustable via the software DeviceMonitor The accumulated values (energy or time) are dis-played in the tariff registers of the main loop, constantly alternating between value, chosen tariff and criteria resp threshold value (see page 27)It is posssible to choose out of 11 tariffs to store the amount of energy or time in case the threshold value is exceeded or undercutExample:The consumed heat energy at a return temperature greater than 50°C shall be recorded in tariff register 1Therefore the tariff register 1 has to be set via software and opto-coupler to tariff 8, threshold value to 50°C and the type of the value to be recorded to energy

Tariff Description Threshold value0 without tariff recording

1 Period from time of day to time of day

2 Power greater or equal

3 Power less or equal

4 Flow rate greater or equal

5 Flow rate less or equal

6 Flow temperature greater or equal

7 Flow temperature less or equal

8 Return temperature greater or equal

9 Return temperature less or equal

10 Temperature difference greater or equal

11 Temperature difference less or equal

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Data Logger (optional)The data logger is an additional functionality for the F90U with which it can be equipped on demand ex factoryIt enables the F90U to record particular consumption- and process-data and store them in adjustable intervals into an internal memory moduleThe recorded data can be used for analysis and process optimizationThe readout of the stored data can be done either via the optical infrared interface or the M-BusThe data logger is made of a ring memory and stores always the latest valu-es In case the ring memory is full it will overwrite the oldest stored values with the latestThe capacity of the ring memory lies between 2117 and 10589 datasets In a network of several meters, the software will read only one meter at a time by its primary address. If there is only one meter connected it is sufficient to access it via address 254The following values (single or multiple) can be set with the software for recording with the data logger

Logged value possible intervalsTime stamp (standard)

01 minute10 minutes15 minutes30 minutes60 minutes03 hours06 hours12 hours24 hours

Heat energy

Cold energy

Volume

Power

Flow rate

Flow temperature

Return temperature

Temperature difference

Attention:In case of a new adjustment of the data logger all stored data will be dele-ted!

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Specifications F90U

Nominal flow rate QP m³/h 0.6 1.5 2.5

Nominal diameter DN mm 15 20

Pressure loss at QP mbar 40 215 110

Pressure loss at QS mbar 140 860 425

Nominal pressure PN bar 16

Starting flow rate l/h 6 12

Minimum flow rate Qi l/h 12 15 25

Maximum flow rate QS m³/h 12 3 5

Connection thread Inch G 3/4 B G 1 B

Overall length mm 110 130

Max operating temperature °C 15 90

Mounting position horizontal or vertical

Temperature sensor Pt1000, direct immersed, 2-wire

Temp sensor diameter mm 52

Cable length temp sensor m 15

Cable length calculator to flow sensor m 085

Ambient temperature °C 5 55

Temperature range °C 1 105

Temperature difference K 3 100

Minimum temp difference K > 05

Temperature resolution °C 001

Measuring cycle temperature s 4 / 60 (dynamic)

Measuring cycle flow s 2

Power supply Lithium-Battery 3V

Lifetime battery 10 years (see characteristics)

Data storage once a day in EEPROM

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Nominal flow rate QP m³/h 3.5 3.5 6.0

Nominal diameter DN mm 20 25

Pressure loss at QP mbar 210 200

Pressure loss at QS mbar 835 790

Nominal pressure PN bar 16

Start flow rate l/h 14 30

Minimum flow rate Qi l/h 35 60

Maximum flow rate QS m³/h 7 12

Connection thread Zoll G 1 B G 5/4 B

Overall length mm 130 150 260

Max operating temperature °C 15 90

Mounting position horizontal or vertical

Temperature sensor Pt1000, direct immersed, 2-wire

Temp sensor diameter mm 52

Cable length temp sensor m 15

Cable length calculator to flow sensor m 085

Ambient temperature °C 5 55

Temperature range °C 1 105

Temperature difference K 3 100

Minimum temp difference K > 05

Temperature resolution °C 001

Measuring cycle temperature s 4 / 60 (dynamic)

Measuring cycle flow s 2

Power supply Lithium-Battery 3V

Lifetime battery 10 years (see characteristics)

Data storage once a day in EEPROM

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Characteristics of approval

EC-Examination Certificate: DE-13-MI004-PTB001

Accuracy: Class 2

Maximum flow rate QS/QP: 2:1

Mechanical class: M1

Electromagnetic class: E1

Protection class: calculator IP54 flow sensor IP65

Flow disturbance class: U0

General characteristics

Display: LCD / 8 digits plus special charactersDisplay heat energy: 3 decimalsUnits: MWh - kW - m³ - m³/h optional: kWh - GJ - l - l/h - MWInterfaces: standard: optical infrared (M-Bus-Protocol) optional: M-Bus galvanically isolated; M-Bus gal- vanically isolated + 2 pulse inputs; wireless M-Bus; wireless M-Bus + 2 pulse inputs; pulse out- put; data loggerLifetime battery: 10 years with limited number of radio telegrams and without pulse output; else 6 + 1 yearsReporting dates: adjustable annual reporting date; 15 monthly repor- ting dates via display; 18 monthly reporting dates via M-Bus and optical interface

Storing ofmaximum values: power and flowInstallation oftemperature sensors: asymmetrical

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EC-Declaration Of Conformity F90U (US2)

Irrtü

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Änd

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vorb

ehal

ten,

Ver

sion

20

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Francaise