Campbell Scientific HMP155A Temperature and Relative Humidity Probe - Manual (Page 15)

HMP155A Temperature and Relative Humidity Probe
6. After selecting the sensor, click at the left of the screen on Wiring
Diagram to see how the sensor is to be wired to the datalogger. The
wiring diagram can be printed out now or after more sensors are
added.
7. Select any other sensors you have, then finish the remaining Short Cut
steps to complete the program. The remaining steps are outlined in
Short Cut Help, which is accessed by clicking on Help | Contents |
Programming Steps.
8. If LoggerNet, PC400, RTDAQ, or PC200W is running on your PC,
and the PC to datalogger connection is active, you can click Finish in
Short Cut and you will be prompted to send the program just created
to the datalogger.
9. If the sensor is connected to the datalogger, as shown in the wiring
diagram in step 6, check the output of the sensor in the datalogger
support software data display to make sure it is making reasonable
measurements.
5. Overview
The HMP155A Temperature and Relative Humidity probe contains a Platinum
Resistance Temperature detector (PRT) and a Vaisala HUMICAP  180
capacitive relative humidity sensor.
The HMP155A outputs a 0 to 1 Vdc signal for temperature and relative
humidity that can be measured by all models of Campbell Scientific
dataloggers with model HMP155ACBL1 cable. The HMP155A also has
RS-485 outputs for temperature and relative humidity that can be interfaced to
the CR800, CR850, CR1000, and CR3000 dataloggers using model
HMP155ACBL2 cable and the SDM-SIO1 Serial I/O Module (Appendix C,
Interfacing with HMP155A RS-485 Output). The RS-485 outputs has a higher
current drain than that listed in the specifications.
The HMP155A can be powered continuously or the power may be switched to
conserve battery life. The HMP155A consumes less than 3 milliamperes
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