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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 3 (page 9) .
Table 3 Intrinsically safe input parameters
Parameter
U
i
I
i
P
i
C
i
L
i
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
the component board requires opening the transmitter enclosure.
Figure 2 Location of test points and service port
1 Multimeter test points for analog output channels 1 and 2
2 Service port for PC connection
Chapter – Using HTM370EX Series transmitters in hazardous locations
Value
28 VDC
100 mA
700 mW
12.1 nF
16 µH
Figure 2 (page
1
Test Points
V mA V mA
CH1
CH2
Associated apparatus entity
parameters
U ≤ U
o i
I ≤ I
o i
P ≤ P
o i
C ≥ C + C
o i cable
L ≥ L + L
o i cable
9). Accessing the test points on
!
Do not remove this cover
A Service Port
Use only in safe area
2
9