HMP45A and HMP45D
U274en-1.2 Operating Manual
1
1. GENERAL
The HMP45A and HMP45D probes are designed for the measurement of
relative humidity and temperature. Humidity measurement is based on the
capacitive thin film polymer sensor HUMICAP
180. Temperature
measurement is based on resistive platinum sensors (Pt 100 and Pt 1000).
Both the humidity and temperature sensors are located at the tip of the probe
and in standard version protected by a membrane filter. The HMP45A and
HMP45D have a similar humidity output, but the temperature output is active
in HMP45A (voltage output 0-1V) and passive in HMP45D (resistive output
Pt 100).
2. CONNECTIONS
The cable wires are connected as shown in Figure 1.
RED GND (SENSE)
VIO GND
BLU V+ 7...35VDC
YEL OUTPUT
0...1V=-40...+60 ˚C
BRN OUTPUT
0...1V=0...100%RH
HMP45A
GREY (SHIELD)
Pt100
Pt100
Pt100
Pt100
Pt100
VIO GND
BRN OUTPUT 0...1V=0...100%RH
BLU 7...35VDC
BLK
GRN
WHT
YEL
RED GND (SENSE)
HMP45D
GREY (SHIELD)
Figure 1 Wire colours
SIGNAL GROUND is used for output signal in a differential measurement. With
SIGNAL GROUND, the cable can be extended up to 100 metres without
disturbing the measurement accuracy. When outputs are not measured against
SIGNAL GROUND, connect GROUND and SIGNAL GROUND to the same point.
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