Spirax Sarco TFA Installation And Maintenance Instructions Manual
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Spirax Sarco TFA Installation And Maintenance Instructions Manual

Spirax Sarco TFA Installation And Maintenance Instructions Manual

Flowmeter for saturated steam service
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1930050/4
IM-P193-02
EMM Issue 4
TFA Flowmeter
for Saturated Steam Service
Installation and Maintenance Instructions
1. Safety information
2. General product information
3. Installation
4. Commissioning
5. Operation
6. Maintenance
7. Spare parts
8. Fault finding
9. Settings table
TFA Flowmeter for Saturated Steam Service
© Copyright 2024
IM-P193-02 EMM Issue 4
1
Printed in GB

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Summary of Contents for Spirax Sarco TFA

  • Page 1 1. Safety information 2. General product information 3. Installation 4. Commissioning 5. Operation 6. Maintenance 7. Spare parts 8. Fault finding 9. Settings table TFA Flowmeter for Saturated Steam Service © Copyright 2024 IM-P193-02 EMM Issue 4 Printed in GB...

  • Page 2: Safety Information

    The product complies with the Electromagnetic Compatibilty Directive 2004 / 108 / EC. A technical file with a reference number of 'UK Supply TFA flowmeter' supports the Spirax Sarco claim that the product complies with the requirements of the Directive and the product can be used in Class A (heavy industrial) and Class B (domestic / commercial areas).

  • Page 3: Intended Use

    Determine the correct installation situation and direction of fluid flow. iv) Spirax Sarco products are not intended to withstand external stresses that may be induced by any system to which they are fitted. It is the responsibility of the installer to consider these stresses and take adequate precautions to minimise them.

  • Page 4: Pressure Systems

    You are advised to assess the risks taking into account the task, the individual, the load and the working environment and use the appropriate handling method depending on the circumstances of the work being done. TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...

  • Page 5: Residual Hazards

    Where no additional information is provided on the Spirax Sarco product compliance web page, this product may be safely recycled and/or disposed providing due care is taken. Always check your local recycling and disposal regulations.

  • Page 6: General Product Information

    2.1 Description The Spirax Sarco TFA flowmeter is designed to reduce the cost of flowmetering and is used as an accurate means to measure saturated steam flowrates and record total flow. The TFA flowmeter is a stand alone device and requires no other equipment, such as differential pressure transmitters, pressure sensors, etc.
  • Page 7 Note: The centralising bush kit must be ordered for the installation flange type used on your application. See Section 3.2.6, page 19, for full details. Flowmeter stem Electronics housing Fig. 1 TFA flowmeter TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...
  • Page 8 Maximum electronics ambient temperature 55 °C (131 °F) Maximum electronics humidity level 90% RH (non-condensing) Designed for a maximum cold hydraulic test pressure of 52 bar g (754 psi g) TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...
  • Page 9 90.1 122.7 160.2 202.8 250.4 DN32 17.1 30.4 47.5 68.3 93.0 121.5 153.8 189.8 DN40 16.7 26.1 37.6 51.1 66.8 84.5 104.3 DN50 10.0 15.6 22.5 30.7 40.1 50.7 62.6 TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...

  • Page 10: Technical Data

    2.8 Materials Part Material Flowmeter body Stainless steel 300 Series Internals 431 S29 / 300 series stainless steel Flowmeter stem Stainless steel 300 series Electronics housing Aluminium alloy LM 25 TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...
  • Page 11 Fig. 3 Size Weight DN25 2.85 (6.28) approximate in mm and kg DN32 2.95 (6.50) (in inches and lbs) (1.38) (4.13) (12.72) (3.15) (4.13) DN40 2.86 (6.30) DN50 2.91 (6.41) TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...

  • Page 12: Installation

    32 bar g Fig. 4 Installation limiting conditions A bypass line will enable safe removal of the TFA flowmeter for maintenance or calibration. Closing valves V1 and V2 and opening valve V3 will allow the TFA flowmeter to be isolated for re-zeroing (temperature to be <...

  • Page 13: Environmental Conditions

    (Pressure / temperature limits are detailed in Section 2.4). Caution: Do not lag (insulate) the TFA flowmeter or mating flanges as this may result in excessive temperatures in the electronics. Exceeding specified temperature limits will invalidate the warranty, adversely effect the performance and may damage the TFA flowmeter, see Figure 6.

  • Page 14: Mechanical Installation

    3.2.1 Orientation The TFA flowmeter can be installed in any orientation when the pressure is below 7 bar g (101 psi g), see Figures 7, 8 and 9. When the pressure is above 7 bar g, the TFA flowmeter must be installed in a horizontal pipe, with the electronics housing below the body, see Figure 9.
  • Page 15 Flow Fig. 8 Horizontal flow limited to 7 bar g Flow Fig. 9 Horizontal flow up to 32 bar g TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...

  • Page 16: Rotating The Electronics Enclosure

    Warning: Do not loosen / remove the stem from the main body of the unit. Warning: Do not loosen /remove the stem from the main body of the unit. 3 mm allen key screw Fig. 10 TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...
  • Page 17 7 bar g. applications below 7 bar g. Note: Fitting the TFA in this orientation when the RS485 board is fitted ensures that the display can be read easily. TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...
  • Page 18 3.2.4 Upstream / downstream pipework The TFA flowmeter should be installed in pipework manufactured to BS 1600, ASME B 36.10 Schedule 40 or EN 10216-2 / EN 10216-5 equivalent, which corresponds to the following pipeline internal diameters: Nominal diameter Nominal internal diameter 25 mm 27 mm (1.062")
  • Page 19 Flow Fig. 12 Avoid installing the TFA flowmeter downstream of an actuated valve as rapid cycling of the valve could give rise to inaccurate results or damage the flowmeter. See Figure 13. In configurations where there is more than one rapid acting pressure reducing valve close coupled, the TFA flowmeter should be installed with a minimum of 25 upstream and 3 downstream pipe diameters away from the valves.
  • Page 20 Bolt ring gaskets having the same internal diameter of the pipework are recommended. This will prevent possible inaccuracies being created by the gasket protruding into the pipe. It is important that the TFA flowmeter is located centrally in the pipework as any eccentricity may cause inaccurate readings. Centralising spacers are provided for use when applicable.
  • Page 21 3.2.6 Centralising bushes To ensure the TFA flowmeter is located centrally in the pipe, centralising bushes are supplied with the meter, depending on the requirement of the pipe size and the flange type. For correct fitting, see table below for correct selection of bush kit.

  • Page 22: Electrical Installation

    If an M750 display unit is purchased from Spirax Sarco for use with the TFA flowmeter, the M750 must be configured to the flow of the TFA flowmeter @ 20 mA. If the TFA flowmeter 4 - 20 mA output is rescaled (see Section 4.6.1), it is important that the 20 mA input valve on the M750 is also rescaled.

  • Page 23: Power Supply Requirements

    Power supply requirements A nominal 24 Vdc is needed to power the flowmeter. However, the TFA flowmeter will operate correctly as long as the power supply is in the range shown in Figure 20. A single, stand-alone, supply may be capable of powering several transmitters.

  • Page 24: Rotating The Display

    Fig. 21 TFA flowmeter display unit All commissioning is carried out through the display unit installed behind the front end cap of the TFA flowmeter enclosure. The display unit consists of a small LCD display and a 5 button key pad.
  • Page 25 Kg/h, KW, bar g, °C Imperial lb/h, MBtu/h, psi g, °F TOTAL The TFA flowmeter is factory set to display steam data in metric units and pressing the up or down keys will scroll through the following data. FLOW Power kW or MBtu/h.
  • Page 26 No signal from sensor (This can also activate the 4-20 mA alarm) SIGNL Signal from sensor constant SENSR (This can also activate the 4-20 mA alarm) CONSt HIGH Flow above the maximum FLOW TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...

  • Page 27: Commissioning Mode

    Any data is entered using the OK button. The previously entered selection will flash. After a period of five minutes without any keys being pressed the TFA flowmeter will automatically default to the run mode. For a full commissioning flow chart see Section 4.3.
  • Page 28 4.3 TFA flowmeter commissioning flow chart Software Normal run mode Default = 8888 Configuration version number display sequence but user settable. sub-menus (test Total BASIC ENTER VER x.x xxxx display) high dAtA PASS Power on sequence; turn on all segments, then...
  • Page 29 4 or 20 mA. per second. CHECK OP = 20 mA 20 mA Comms Baud 1200 Type 9600 ASCII Modbus Press OK to select dISP Display TEST 4-20 mA xxx.xxmA PULSE OUt CANCL TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...
  • Page 30 This function is used to clear the total by pressing and holding the 'OK' key for 3 seconds. Note: The total is backed-up every 8 minutes in the TFA flowmeter's non-volatile memory. If power is lost the TFA flowmeter could lose up to 8 minutes worth of totalised steam. 4.4.4 AtMOS PRES This value compensates the flowrates for atmospheric pressure.
  • Page 31 4.5.1 dIR dIR is the orientation that the TFA flowmeter is installed in. The TFA flowmeter can be installed with horizontal flow up to a pressure of 32 bar g (464 psi g). For installations that require vertical flow either up or down the maximum pressure must not exceed 7 bar g (101 psi g).

  • Page 32: Outputs Sub-Menu

    This allows the 4 mA value to be re-calibrated. A digital volt meter/multimeter should be connected in series with the 4-20 mA output. Pressing the right arrow button will display OP = 4 mA and the TFA flowmeter will output a steady 4 mA. If the multimeter does not read 4 mA the up and down arrow buttons can be pressed to alter this current until 4 mA exactly is indicated.
  • Page 33 If you have selected Modbus communications you must add an address. This is a three digit number between 001 - 255. Again this must match the address of the device it is communicating to. TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...

  • Page 34: Test Sub-Menu

    4.7 tESt sub-menu The tESt sub-menu allows access to the TFA flowmeter's diagnostic tools. From here the display, 4-20 mA and pulse outputs can be tested. tESt dISP 4-20mA xxx.xxmA PULSE CANCL 4.7.1 dISP This allows the display to be tested. Pressing the right button will cause all the segments on the display to be turned on.

  • Page 35: Alarm Sub-Menu

    It detects if the flow has been constant for long periods when at pressure, which may indicate a stuck / damaged target cone due to debris. If the system that the TFA is fitted to, has long periods where there is zero flow, but the line is kept at a constant pressure, it is advisable to turn the alarm off to avoid unwanted alarm messages.
  • Page 36 Response time: The TFA will start responding within 500 msec. The actual time to fully receive a response from the TFA is baud rate dependent, for example a Modbus poll of 12 registers @1200 baud rate could take ((5 + 24) bytes x ~10 ms / byte) + 500 ms ≈...

  • Page 37: Ascii Communications

    The electrical wiring for the EIA 232C communications has been carried out in accordance with the EIA 232C standard. Please note the TFA EIA 232C connection requires a connector RJ11 linked to a 9 way D-type adaptor. Figure 24 illustrates the TFA flowmeter's RJ11 socket from the front.
  • Page 38 4.11.3 Using RS485 Communications The TFA is available with RS485 communications. This is achieved by converting the communication from RS232 by an additional PCB. The PCB is fitted at the factory when the TFA is ordered with RS485 communications. Note: RS232/4-20 mA outputs are not available if the RS485 board is fitted.

  • Page 39: Modbus Communications

    The TFA flowmeter has Modbus communications, in addition to the ASCII Modbus comms that are available through the TFA RS232 port. An RS485 to RS232 converter is required, or alternatively, an Ethernet to RS232 converter, both of which are widely available.
  • Page 40 (LSB) (MSB) address address (MSB) (LSB) (MSB) (LSB) (12) The above frame will poll all Modbus registers from Total low 16-bits up to and including Software Version. TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...
  • Page 41 40026 Water equivalent flowrate Lbs/hour 40027 Power KBTU/h Energy = (Energy high x 65536) + 40028 Energy low 16 bits kBTU Energy low * 40029 Energy high 16 bits kBTU TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...
  • Page 42 Multiply by the inverse 'Received Data Scale' to extract data in relevant units, i.e. divide polled 'Temperature' by 10 to get the value in °C. Tip: use real (float) type to retain 2-decimal-point accuracy. TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...
  • Page 43 As the TFA is a loop powered instrument, it needs CTS and / or DTR to be wired into it so that it can use these to power its communications interface.

  • Page 44: Operation

    This strain is then converted into a density compensated mass flowrate and is transmitted via a single loop powered 4 - 20 mA output and pulsed output. The unique design of the TFA flowmeter produces the high turndowns and high accuracy required in process applications.

  • Page 45: Fault Finding

    Many faults which occur on commissioning are found to be due to incorrect wiring or setting up, therefore it is recommended that a thorough check is carried out should there be a problem. The TFA flowmeter display has in-built diagnostic features and will indicate a number of errors on the display and via the 4-20 mA output.
  • Page 46 Section 4.6.7. Pulse width incorrectly set. Check maximum pulse width of counter electronics. Pulse output is overloaded. Check load ratings. Pulse output electronics faulty. Test pulse output. If faulty replace unit. TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...
  • Page 47 Green diode lit, Baud rate set wrong. Change baud rate. Yellow diode flashing, blue Change ASCII to Modbus or Modbus diode off. ASCII / Modbus selected wrong. to ASCII. TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...

  • Page 48: Settings Table

    4 mA setting 20 mA setting Flowmeter maximum @ 32 bar g Outputs Pulse Source data Total Number of pulses 1 per kg Pulse width 50 mS Error High Pass code 7452 TFA Flowmeter for Saturated Steam Service IM-P193-02 EMM Issue 4...

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