Changing The Type Of Protection - ABB SensyMaster FMT230 Commissioning Instruction

FMT230, FMT250 THERMAL MASS FLOWMETER | CI/FMT230/250-EN REV. B

Changing the type of protection

If you are installing in Zone 1 / Div. 1, the Modbus interface and digital outputs of models FMT230/250 can be operated with different
types of protection:
• Modbus interface and digital output in intrinsically safe ia / IS design
• Modbus interface and digital output in non-intrinsically safe design
If a device that is already operational is operated with a different type of protection, the following measures must be
implemented/insulation checks performed in accordance with applicable standards.
Original installation New installation
Zone 1 / Div. 1: Zone 1 / Div. 1:
Modbus interface and digital Modbus interface and digital
outputs in non-intrinsically safe outputs in intrinsically safe
design ia / IS design
Zone 1 / Div. 1: Zone 1 / Div. 1:
Modbus interface and digital Modbus interface and digital
outputs in intrinsically safe outputs in non-intrinsically safe
ia(ib) / IS design design
Note
For further details on explosion protection, types of protection and device models, refer to the installation diagram in the annex!
Necessary test steps
• 500 × 1.414 = 710 V DC/1min
Test between terminals A / B, 41 / 42 as well as 51 / 52 and the terminals A, B, 41, 42, 51 and
the housing. When this test is performed, no voltage flashover is permitted in or on the
device.
• Optical evaluation particularly of the electronic circuit boards, no visible damage or evidence
of explosion.
• Visual inspection, no damage visible on the threads (cover, ½ in NPT cable glands).
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