Vaisala HMT100 - Manual (Page 23)

Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 23
NOTE If an isolated output is required with current outputs, both channels
require their own power supply. CH1 is always required to be powered
because CH1 is the main output, and the transmitter will not operate if
only CH2 is connected.
4.
Close the cover and tighten the cover screws. The transmitter is
ready for use.
0704-064
Figure 10 (1) Isolated Current-Loop Wiring, (2) Voltage Output
Wiring
Table 3 Wiring Table
Terminal Current Output
(2-Wire, CH2 Isolated)
Voltage Output
(3-Wire)
1 CH1+ (signal and power supply +) Power supply +
2 CH1– (signal and power supply –) Power supply –
3 CH1+
4 CH2+
5 CH2+ (signal and power supply +)
6 CH2– (signal and power supply –) CH– (for both
channels)
7 Shield Shield
The numbers 1 ... 7 in the first column of the wiring table refer to Figure
10 above. If you have at order time selected a two-wire transmitter, make
the wiring according to item 1 in Figure 10. If you have selected a three-
wire transmitter, make the wiring according to item 2 in Figure 10.