P.O. Box 26, FIN-00421 Helsinki, FINLAND
Tel: +358 9 894 91
Fax: +358 9 8949 2485
Email: industrialsales@vaisala.com
www.vaisala.com
HMP45A & HMP45D Relative Humidity and Temperature Probes; Solar Radiation Shield
The HMP45A and HMP45D humidity and temperature probes are excellent for measuring humidity in weather stations.
Versatile probes
The Vaisala HUMICAP® Humidity and Temperature Probes HMP45A and HMP45D are designed for a wide range of instrumentation (e.g. recorders, data loggers, laboratory equipment and weather stations.)
The probes interface easily, are simple to service, operate from a wide range of supply voltages and consume little power.
The HMP45A/D is an excellent solution for measuring humidity in weather stations. However, the Vaisala HUMICAP® Humidity and Temperature Transmitter HMP337, with warmed sensor head, is a better solution if condensation continuously disturbs measurement.
Vaisala HUMICAP® Sensor
The combined performance of the Vaisala HUMICAP® Sensor and IP65 (NEMA 4) protected probe provides accurate and repeatable humidity and temperature measurements in high humidity.
Easy field maintenance
Field calibration is easy. The probe head containing the sensor and electronics can be quickly removed from the probe body, a replacement installed and the measurements continued while the other sensor head is calibrated in a laboratory.
44
'The DTR503A shield provides protection from both scattered and direct solar radiation, and precipitation.
On-site, one-point calibration
One-point calibration of relative humidity and temperature can be done in the field using Vaisala HUMICAP® Humidity Indicator HMI41.
Shield protects sensor
Vaisala Radiation Shield DTR503A is a naturally ventilated, maintenance-free, 12 plate plastic shield that protects the humidity and temperature sensors from both scattered and direct solar radiation, and precipitation. The plastic material in the plates offers excellent thermal characteristics and UV stabilized construction. The white outer surface reflects radiation, while the black inside absorbs accumulated heat.
The shield is easy to install and is suitable for a wide range of applications. It can be installed on a vertical pole, horizontal beam, or flat surface.
DTR503A horizontal beam installation.
Features/Benefits
•Vaisala HUMICAP® Humidity and Temperature Probes HMP45A/D provide up to 100 %RH with high accuracy
•Vaisala HUMICAP® Sensor for excellent accuracy, negligible hysteresis and long-term stability in high humidities, and is resistance to dust and most chemicals.
•Easy field calibration
•Vaisala Solar Radiation Shield DTR503A
•IP65 (NEMA 4) housing protects against dust, water spray, and electromagnetic interference.
•NIST traceable (certificate included)
Dimensions
Dimensions in mm.
DTR503A |
(ø105) |
|
for the HMP45A/D |
||
|
||
|
(266) |
|
(437) |
|
|
|
(233) |
DTR503A pole mast installation.
Pole Mast diameter
30...60 mm/ 1,2" ... 2,3"
HMP45A/D
Vaisala Instruments Catalog 2007
Ref. B210641en rev. A
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