NovaLynx Corporation
225-HMP60x
Page 6
February 2021
5
INSTALLATION
Note: The tip of the sensor may be protected by a yellow plastic cap to prevent damage in shipping.
Remove the yellow cap before installing the sensor.
The
225-HMP60
sensors must be protected from direct sunlight and precipitation when used outdoors
for weather monitoring. A variety of sunshields are available, ranging from self-aspirated to fan-
aspirated models. Fan aspirated sunshields are preferred where there is little or no air movement.
Some fan-aspirated units include a solar array, eliminating the need for an external power source for
the fan.
Note: When model 380-280-HMP60 Sunshield is ordered at the same time as the 255-
HMP60x Sensor, the sensor is pre-assembled, making installation simpler.
Recommended sunshields include brackets for mast mounting by means of a U-bolt. The U-bolt can be
removed for surface mounting the bracket. Refer to instructions included with the specific model for
installation of the sensor and mounting options.
Mast-mounted sensors are usually positioned at "shelter" height, or about four feet above ground
level, on the north side of the mast. Temperature readings can be affected by heat reflected from the
ground so try to avoid installation over asphalt or bare ground.
Wire the sensor to your monitoring equipment according to the wire installation tables (Section 3). Use
the table marked "225-HMP60 with Extended Cable" if the optional additional cable was ordered.
Program your logger or PLC to power the sensor for at least 4 seconds before taking a reading.
6
MAINTENANCE
The
225-HMP60 Relative Humidity and Temperature Sensors
do not require calibration and have no
calibration adjustments available to the user. Field-check the accuracy of the sensor by comparison
with an accurate reference on an annual basis, or more often in dusty or polluted areas.
The probe may be removed from the sunshield for inspection and service if necessary. With the probe
removed, clean off any dust that has collected on or inside the sunshield.
Sunshield
Type
Power Supply
380-280-HMP60
Self Aspirated
n/a
380-281
Self Aspirated
n/a
380-283
Fan Aspirated
Integrated solar panel / NiMh battery
380-RHRS
Self Aspirated
n/a
380-43502
Fan Aspirated
12-14 Vdc @ 500 mA for blower, AC adapter included
