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Humidity and Air Temperature Probe Vaisala HMP155
Installation Guide
The HMP155 measures ambient air temperature and
humidity and provides data to the Sutron 9210B datalogger
as analog signals. Here are basic installation and operating
guidelines for using the using the HMP155 in LI-COR eddy
covariance systems with a biomet system running Biomet_
100, Biomet_101, Biomet_102, and Biomet_103 programs.
VAISALA
HMP155
HUMIDITY AND
TURE PROBE
TEMPERA
1Temp Signal (white)
2 Not Connected (brown)
2
3 Analog Ground (green)
4 RH Signal (yellow)
3
5 Not Connected (grey)
6 Not Connected (pink)
4
7 Voltage, 12 VDC (blue)
8 Ground (red)
9 Shield (black)
8
1
7
6
5
Figure 1. Install the HMP155 at a minimum distance from nearby
obstructions of at least four times the height of the obstruction (H).
Place the HMP155 over an open, level area that is
free of obstructions.
HMP155 Specifications:
Operating Temperature Range:
Operating Humidity Range:
Voltage Output:
Average Current Consumption:
Operating Voltage:
-40 to +60 °C
0 to 100% RH
0 to 1 V
<3 mA
7 to 28 VDC
For more information and complete operating instructions
see: www.vaisala.com/HMP155
Place it at least 30 m from paved areas.
Position the probe as far above vegetation as
possible. If you will use the temperature
measurement for eddy covariance data
processing, position the sensor close to the sonic
anemometer but far enough away that it won't
obstruct airflow.
3. Mount the Humidity and Temperature Probe.
Installing the HPM155
1. Assemble the Humidity and Temperature Probe.
Wrap the band clamp around a vertical
mast.
VAISALA
HMP155
HUMIDITY AND
TURE PROBE
TEMPERA
Secure the cable to the tower using zip ties.
Avoid bending the cable sharply.
Remove
Remove the protective yellow cap from the sensor
prior to use.
Install the HMP155 in the R.M. Young 14-plate
radiation shield (7900-135).
Loosen the plastic split-nut on the bottom of the
radiation shield and insert the sensor into the splitnut and shield. Tighten the split-nut to clasp the
sensor.
4. Install the Humidity and Temperature Probe
Leads.
The HMP155 is supported by datalogger programs
Biomet_100, Biomet_101, Biomet_102, and Biomet_
103. For custom programs, use the AT/RH block and
configure it as described in "Humidity and
Temperature Probe (HMP155)" in the Biomet System
Instruction Manual.
Note: Route the sensor cable(s) through an opening in
the enclosure prior to installing the leads in the terminal
strip.
2. Siting the Humidity and Temperature Probe.
1
Table 2. HMP155 wiring for the Biomet_102 and Biomet_103
programs. For Biomet_102, terminal assignments are for AIO2. For
Biomet_103, terminal assignments are for AIO3.
Figure 2. HMP155 wiring for the Biomet_100 and Biomet_101
programs.
Table 1. HMP155 wiring for the Biomet_100 and Biomet_101
programs.
Description
Color
Terminal
Temp. Signal (+)
Shield
RH Signal (+)
Signal Ground
Power Ground
Power (+)
Not Connected
White
Black
Yellow
Green
Red
Blue
Brown/Gray/Pink
A15 (CH8)
A16 (AGND)
A17 (CH9)
B14 (GND)
B14 (GND)
B15 (SW'D12)
None
Description
Color
Terminal
Temp. Signal (+)
Shield
RH Signal (+)
Signal Ground
Power Ground
Power (+)
Not Connected
White
Black
Yellow
Green
Red
Blue
Brown/Gray/Pink
11 (CH8)
12 (AGND)
13 (CH9)
15 (GND)
17 (GND)
18 (SWBAT)
None
Retrieving Data
If the system is configured to log biomet data in .ghg files
for processing in EddyPro® software or the SMARTFlux™,
see "Field Setup for Logging Data in GHG Files" in the
Biomet System Instruction Manual. Otherwise, see
"Retrieving Data" in the Biomet System Instruction Manual
to get data from the datalogger memory.
Maintenance
Monthly: Check the radiation shield to be sure it is free
of debris.
Check the probe filter for contaminants. Clean or
replace as needed. Replacement filters are available
from Vaisala.
Clean the probe with a soft, lint free cloth. Use water
and mild detergent if needed.
In regions near salty bodies of water, salt may
accumulate on the radiation shield, sensor, or filter.
Salt should be removed by gently rinsing with distilled
water.
Recalibrate the sensor based on the manufacturer’s
recommendations.
Figure 3. HMP155 wiring for the Biomet_102 program. Wiring for
Biomet_103 is identical, except leads connect to AIO3 rather than
AIO2.
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Serving Denmark, Finland, Ireland, Norway, Sweden, and UK.
LI-COR Biosciences UK Ltd.
St. John’s Innovation Centre
Cowley Road
Cambridge
CB4 0WS
United Kingdom
Phone: +44 (0) 1223 422102 • Fax: +44 (0) 1223 422105
envsales-UK@licor.com • envsupport-UK@licor.com
LI-COR Distributor Network:
www.licor.com/env/distributors
© LI-COR, Inc. 2014
07/14 988-12668 Rev2
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