Electrical Connections; Safety Instructions - ABB SensyMaster FMT230 Commissioning Instruction

FMT230, FMT250 THERMAL MASS FLOWMETER | CI/FMT230/250-EN REV. B
Installation of the sensor during operation
Note
The changing device must be in the disassembly position before
disassembling the sensor, the sensor connection is sealed.
Installing the sensor:
1. Place the supplied O-ring in the groove of the sensor
connection.
2. Carefully slide the sensor into the changing device.
Observe correct alignment to the centering pin in the
process.
3. Fasten the sensor to the sensor connection using screws.
Use the supplied M12 screws, as well as two extended
special screws for this.
4. Place the protection caps onto the special screws and
tighten using two nuts.
5. Twist the transmitter with the union nut into the
measuring position. The lower edge of the union nut
indicates the position of the sensor. Only when the
measuring position is reached 50 - OPEN - MESSEN (the
lower limit stop of the union nut) will the sensor be in the
middle of the piping and precise values can be provided.
6. Carry out the electrical connection
Disassembly of the sensor during operation
Disassembly of the sensor:
1. Twist the transmitter with the union nut into the
disassemble position. The lower edge of the union nut
indicates the position of the sensor. Only when the
disassemble position is reached 0 - CLOSE - ZU (the
upper limit stop of the union nut) will the sensor be in the
disassemble position and the hot tap fitting sealed off
from the process.
2. Disconnect electrical connections.
3. Remove protection caps.
4. Remove flange screws.
5. Carefully pull the sensor out of the changing device (do
not tip to the side).

7 Electrical connections

Safety instructions

DANGER
Danger of explosion if the device is operated with the
transmitter housing or terminal box open!
Before opening the transmitter housing or the terminal box,
note the following points:
• A valid fire permit must be present.
• Make sure that there is no explosion hazard.
• Switch off the power supply and wait for t > 20 minutes
before opening.
WARNING
Risk of injury due to live parts.
Improper work on the electrical connections can result in
electric shock.
• Connect the device only with the power supply switched
off.
• Observe the applicable standards and regulations for the
electrical connection.
The electrical connection may only be established by authorized
specialist personnel and in accordance with the connection
diagrams.
The electrical connection information in this manual must be
observed; otherwise, the IP rating may be adversely affected.
Ground the measurement system according to requirements.
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