ABB SensyMaster FMT230 Commissioning Instruction page 34

34 FMT230, FMT250 THERMAL MASS FLOWMETER | CI/FMT230/250-EN REV. B
... 6 Installation
... Assembly of the welding adapter with compression ring fitting
Disassembly and reinstallation of the sensor
When mounting the sensor, a distinction is made between first
installation and reinstallation. We will address reinstallation
below.
Please also follow the 'An Installer's Pocket Guide for Swagelok®
Tube Fittings – MS-13-151.pdf' available at www.swagelok.de/en.
Required tools
• Open-end wrench, width across flats 35 mm (1⅜ in)
• Open-end wrench, width across flats 38 mm (1½ in)
• Marker pen (permanent marker) for marking
Disassembly of the sensor
WARNING
Risk of injury due to process conditions
The process conditions, for example high pressures and
temperatures, toxic and aggressive measuring media, can
give rise to hazards when working on the device.
• Before working on the device, make sure that the process
conditions do not pose any hazards.
• If necessary, wear suited personal protective equipment
when working on the device.
• Depressurize and empty the device / piping, allow to cool
and purge if necessary.
1. Depressurize and empty the device / piping, allow to cool
and purge if necessary.
2. Switch off the power supply of the sensor and remove the
connection cable.
3. Using a suited marker pen, mark the orientation and height
of the sensor on the sensor protection tube, compression
fitting and the welding adapter (see Figure 20, pos.
4. Carefully loosen the union nut of the compression fitting and
hold the sensor while doing so to prevent the sensor
protection frame from hitting the bottom of the piping.
NOTICE
Damage to the device
Mechanical damage to the sensor element can occur due to
improper disassembly.
• The sensor protection frame must not hit the bottom of
the piping.
5. Loosen the fitting body of the compression fitting on the
welding adapter and pull out together with the sensor.
Note
Very high clamping forces are exerted on the clamp ring when
the compression fitting is tightened. As a result, the clamp ring
is lightly pressed into the sensor protection tube. The
compression fitting can no longer be shifted onto the sensor
protection tube and the 'Z' dimension can be readjusted once
again.
Reinstallation of the sensor
WARNING
Risk of injury
Risk of injury due to the sensor ejecting because of a missing
safety ring.
• Mount the sensor with compression fitting only with the
safety ring in place.
1. Make sure that the safety snap ring is inserted in the
provided snap ring groove (see Figure 20, pos.
2. Apply sealing compound to the pipe thread of the fitting
body.
3. Carefully insert the sensor into the welding adapter.
3 ).
NOTICE
Damage to the device
Mechanical damage to the sensor element can occur due to
improper installation.
• When inserting into the welding adapter, sensor
protection frame must not hit the bottom of the piping.
4. Screw in the compression fitting (with thread sealing
compound) into the welding adapter, first by hand and then
tighten with 1.5 to 2.5 turns.
5. Align the sensor in accordance with the marking (height and
direction of flow) and tighten the union nut up to the marked
position.
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