3. Transmitter maximum input parameters:
Max. input
voltage Ui (V)
Max. input
current Ii (mA)
Max. input
power Pi (mW)
Max. input parameters
28 100 700 Ci(nF) Li(μH)
12.1 16
4. When the transmitter is used in mixed explosive gas atmospheres, the transmitter must
be used with certified intrinsic safety associated apparatus in intrinsic safety system. The
system wiring must comply with the installation manuals of the transmitter and intrinsic
safety associated apparatus. The terminals for connection must not be wrong.
5. The enclosure Type of Protection of the transmitter is IP54.
6. To avoid dismissing and damaging the explosion-proof characteristics of the transmitter,
it is strictly prohibited for the user to modify the electrical components. The user must
contact the product manufacturers to solve any operating problems.
7. Electrical installations design, selection, erection, installations inspection, maintenance,
equipment repair, overhaul and reclamation shall comply with relative requirements in the
manual, GB 3836.13-2013
(note: IEC
60079-19 MOD), GB/T 3836.15-2017
(note: IEC 60079-14 MOD), GB/T 3836.16-2017
(note: IEC 60079-17 MOD), GB/T
3836.18-2017 (note: IEC 60079-25 MOD) 及 GB
50257-2014
(English name:
Code for construction and acceptance of electric equipment on fire and explosion hazard
electrical equipment installation engineering).
Wiring requirements
• The cable glands and cables used for wiring the device must not impair the Ex protection.
• Unused lead-throughs must be sealed using Ex compliant plugs.
• 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!
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 16 (page 36).
Table 16 Intrinsically safe input parameters
Parameter Value Associated apparatus entity
parameters
U
i
28 VDC U
o
≤ U
i
HMT370EX User Guide M212305EN-B
36
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