3.6.2.1 Specific conditions of use
Potential risk of sparking from aluminum alloy enclosure. The
equipment shall be installed in such manner as to prevent the possibility of
sparks resulting from friction or impact against the enclosure.
CAUTION!
Wiring requirements
• The cable glands and blanking elements used with the transmitter shall conform to
requirements of ANSI/UL 60079-0.
• Unused lead-throughs must be sealed using Ex compliant blanking elements.
• Select a strain relief option that suits the application (either use cable glands that include
strain relief or install separate clamps: see IEC 60079-14).
Connect only de-energized wires. Never switch on the power supply
input before completing the wiring and closing the transmitter body.
CAUTION!
Review the FM Approvals wiring requirements for intrinsically
safe operation in FM Approvals control drawing (page 49) before installation.
WARNING!
Intrinsic safety
The overvoltage category of HMT370EX transmitters is I (non-mains equipment), and ambient
pollution degree is 4, as specified in IEC 60664-1. For intrinsically safe input parameters, see
Table 22 (page 47).
Table 22 Intrinsically safe input parameters
Parameter Value Associated apparatus entity
parameters
U
i
28 VDC U
o
≤ U
i
I
i
100 mA I
o
≤ I
i
P
i
700 mW P
o
≤ P
i
C
i
12.1 nF C
o
≥ C
i
+ C
cable
L
i
16 µH L
o
≥ L
i
+ L
cable
Using analog output test points
There are test points for measuring the voltages and currents of the analog outputs, located
above each screw terminal block as shown in Figure 14 (page 48). Accessing the test points
on the component board requires opening the transmitter enclosure.
Chapter 3 – HMT370EX regional safety certification information
47
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