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

The Modbus interface and the digital outputs of the models FMT230/250 can be operated with different types of protection:
• When connecting to an intrinsically safe circuit in Div. 1 as an intrinsically safe device (IS).
• When connecting to a non-intrinsically safe circuit in Div. 1 as a device with flameproof enclosure (XP).
• When connecting to a non-intrinsically safe circuit in Div. 2 as a non-sparking device (NI).
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
Housing: XP, U = 30 V Housing: XP
max
Outputs non IS Outputs: IS
Housings: Div 2
Outputs: NI
Outputs: IS Housing: XP
Housing: XP Outputs: non IS
Housing: XP
Outputs: NI
Housing: XP, U = 30 V Housing: XP
max
Outputs: NI Outputs: IS
Housing: XP
Outputs: non IS
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.
• 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).
• No special measures.
• 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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