T-mass 65 Thermal Mass Flowmeter Installation Guide
A full pipe is a prerequisite for accurate measurement with a thermal flowmeter. Therefore, the following requirements must be observed when installing the flowmeter.
1. Installation Location
Disturbed fluid conditions have a significant impact on instruments that measure based on the thermal dispersion principle. The correct installation location is the foundation for ensuring measurement accuracy.
- Observe the recommended upstream and downstream straight pipe length requirements.
- Rich engineering practice experience is a prerequisite for correct piping system design and installation.
- Ensure the correct installation orientation and installation position of the sensor.
- Take necessary measures to reduce or avoid condensation (for example: install a condensate separator, apply thermal insulation, etc.).
- The requirements for the maximum permissible ambient temperature and medium temperature range must be observed.
- Install the transmitter in a shaded area, or install a protective cover.
- Based on mechanical structural considerations, in order to protect the pipe, it is recommended to use a mounting base when installing a heavier sensor.
① When measuring saturated gases or impure gases, it is recommended to use a vertical pipe with an upward flow direction to reduce the effects of condensation/contamination.
② Not recommended for strong vibration conditions or unstable installation.
③ Only suitable for clean/dry gases. If adhesion or condensation may occur, do not use a horizontal pipe with the transmitter head facing downward. Refer to the sensor installation
④ When measuring moist gases or saturated water gases (for example: biogas), it should be installed on an inclined pipe (a = max. 135°).
2. Insulation
When measuring moist gases or saturated water gases (for example: steam), the piping and the flowmeter housing should be thermally insulated to prevent water droplets from penetrating into the measurement sensor.
Schematic diagram of the maximum insulation layer thickness for T-mass 65F and 65I:
a. Maximum insulation layer thickness for the flanged sensor
b. Maximum insulation layer thickness for the insertion sensor
3. Upstream and Downstream Straight Pipe Lengths for Thermal Flowmeters
Disturbed fluid conditions have a significant impact on instruments that measure based on the thermal dispersion principle. Generally, thermal flowmeters should be installed as far away from disturbance sources as possible. For detailed information, please refer to the ISO 14511 standard.
- When two or more disturbance sources exist upstream of the flowmeter, the recommended upstream straight pipe length for the strongest disturbance source should be observed. For example: if a valve is installed before a pipe elbow, the required straight pipe length between the valve and the flowmeter should be 50 x DN.
- When measuring very light gases (for example: helium and hydrogen), all upstream straight pipe lengths should be doubled.
Minimum recommended upstream and downstream straight pipe lengths (without flow conditioner):
Flanged sensor
1=Reducer; 2=Expander; 3=90° elbow or T-piece; 4=2x90° elbow; 5=2x90° elbow (3-way); 6=Control valve
Insertion sensor
1=Reducer; 2=Expander; 3=90° elbow or T-piece; 4=2x90° elbow; 5=2x90° elbow (3-way); 6=Control valve or pressure regulator
General thermal mass flowmeter installation requirements (reducer, expander, and 90° elbow or T-piece):
| Sensor Type | Upstream Straight Pipe Length | Downstream Straight Pipe Length |
|---|---|---|
| Flanged sensor | 15 x DN | 2 x DN |
| Insertion sensor | 20 x DN | 5 x DN |
4. Orifice Flow Conditioner
When the upstream and downstream straight pipe length requirements cannot be met, it is recommended to install an orifice flow conditioner.
1 = Flow conditioner for flanged sensor; 2 = Flow conditioner for insertion sensor
Flow conditioner for insertion sensor 65I
The applicable pipe diameter range is DN 80 .. 300 mm (3...12"). The flow conditioner must be installed upstream of the sensor, with an upstream straight pipe length of 8 x DN. The flow conditioner itself also requires an upstream straight pipe length of 5 x DN.
Flow conditioner for flanged sensor 65F
Endress+Hauser specially designed t-mass F sensor (nominal diameters DN 25 .. 100 (1' ... 4")). Various mounting hole types and installation dimensions are available. One orifice plate can simultaneously meet the requirements of multiple different flange ratings (for example: CI. 150 and CI. 300).
Installation of the flow conditioner:
The flow conditioner and gasket must match the two pipe flanges and the flowmeter flange. Only mounting nuts that match the flange bolt holes are allowed to ensure correct positioning. The alignment slot must be in the same horizontal plane as the transmitter. Incorrect installation of the flow conditioner has very little impact on measurement accuracy.
1=Orifice flow conditioner; 2=Sealing ring/gasket; 3=Alignment slot; 4=Calibration slot in the same plane as the transmitter
Downstream straight pipe length with pressure measurement: The pressure measurement point should be installed on the downstream pipe of the measuring instrument to ensure that the process connection of the pressure transmitter has no effect on the flow entering the measurement point.
Note!
- To optimize measurement performance, it is recommended to order the t-mass F sensor and the flow conditioner together so that both can be calibrated at the same time. This has minimal impact on measurement performance.
- When other types of flow conditioners not from Endress+Hauser are used with the t-mass F sensor for measurement, the fluid conditions and pressure drop in the pipe may affect measurement performance.
- Bolts, nuts, sealing rings, etc. are not standard supplied parts and must be provided by the user.
5. Requirements for the Piping System
- The connecting pipe should be consistent with the inner diameter of the flowmeter. The maximum pipe diameter deviation must not exceed:
- Nominal diameter < DN 200 (8"): 1 mm (0.04 inch)
- Nominal diameter ≥ DN 200 (8"): 3 mm (0.12 inch)
- During reinstallation, no metal particles or abrasive particles should be generated, to prevent damage to the sensing element during startup.
6. Installation Orientation of the Thermal Mass Flowmeter
Always ensure that the arrow on the sensor points in the same direction as the gas flow in the pipe.
Flanged
Insertion
① When measuring saturated gases or impure gases, it is recommended to use a vertical pipe with an upward flow direction to reduce the effects of condensation or contamination.
② In environments with severe vibration, or when installation is unstable, this installation orientation is not recommended.
③ Only suitable for measuring clean gases/dry gases. When measuring very moist gases or saturated water gases (for example: biogas), do not install the sensor from the bottom of a horizontal pipe. An inclined pipe installation orientation as shown in the figure below should be used (a = 135°).
7. Installation of the Insertion Sensor
Installation conditions for the welding socket:
Caution!
When installing in thin-walled rectangular pipes, please use a suitable sensor bracket for installation.
D = Ø31.0mm±0.5 mm (Ø1.22"±0.019")
Adjusting the position of the insertion sensor:
Insert the sensor into the welding socket, hand-tighten the lower nut of the fastening sleeve, then use a wrench (42 mm) to tighten by 1/4 turn.
Caution!
- NPT thread: Use thread sealing tape or sealant
- G1A thread: A sealing ring must be installed (standard supplied part)
Calculation of insertion depth:
a. Inner diameter of circular pipe. When the sensor is installed vertically, the pipe height of a rectangular pipe; when the sensor is installed horizontally, the pipe width of a rectangular pipe. (a = min. 80 mm or 3")
Calculate insertion depth: (0.3 x a) + b + c + 2 mm
(Insertion depth = (0.3 x A) + B + (C1 + C2) + 0.079 inch)
b. Pipe wall thickness
c. Depth of the welding stub on the pipe, including the sensor pipe connection and the online replacement installation kit (optional).
The minimum length required for the insertion sensor can be calculated using Endress+Hauser's Applicator sizing software (version 10.02 or later) or by the following steps. The minimum length required for the insertion sensor depends on the required insertion depth. The calculated insertion depth value must be within the adjustable range of the corresponding insertion sensor.
1. Determine dimensions A, B, C1 and C2
A = Circular pipe: pipe inner diameter (DN); rectangular pipe/channel: internal dimension
B = Pipe wall thickness or channel thickness
C1 + C2 = Installation component length and insertion pipe length of the fastening sleeve
When calculating the insertion depth through the sensor "Quick Setup" menu, the following parameters are required:
2. Calculate insertion depth: Insertion depth = (0.3 x A) + B + (C1 + C2) + 2 mm
3. Compare the calculated insertion depth value with the parameter values in the table below to obtain the appropriate insertion depth for the insertion sensor. The calculated insertion depth value must be within the adjustable range of the corresponding insertion sensor!
Adjusting the calculated insertion depth value:
- Tighten the upper nut of the fastening sleeve, ensuring that sensor position adjustment can still be performed.
- Adjust the sensor position according to the calculated insertion depth value.
Referring to the flow direction, adjust the insertion direction of the insertion sensor:
Check and confirm that the sensor installation direction on the pipe is 90° to the flow direction, and rotate the sensor so that the arrow on the sensor points in the same direction as the flow.
Securing the insertion sensor:
- Hand-tighten the fastening sleeve (1) to secure the sensor. Then, use an open-end wrench (36 mm) to tighten an additional 1/4 turn clockwise.
- Tighten the two fixing screws (4), (hexagon socket wrench 3 mm; 1/8").Warning! Note the torque: 4 Nm (2.95 lbf ft)
- Check to ensure that the sensor and transmitter no longer rotate.
- At maximum operating pressure, check whether there is leakage at the measurement point.
8. Transmitter Installation Guide
Rotating the field-mounted aluminum housing: Field-mounted aluminum housing, suitable for non-hazardous areas
Field-mounted aluminum housing, for Zone 1 or Cl. I Div. 1 hazardous areas
- Loosen the fixing screw.
- Gently rotate the transmitter housing clockwise until it reaches the stop position (top of the thread).
- Rotate the transmitter housing counterclockwise (max. 360°) to the desired position.
- Retighten the fixing screw.
- Press the side latch of the display module to remove the display module from the electronics compartment cover.
- Rotate the display module to the desired position (maximum rotation angle in both directions is 4x45°), and reinstall the display module onto the electronics compartment cover.
