This product is no longer available and has been replaced by: HMP60. Some accessories, replacement parts, or services may still be available.
HMP50-L Temperature and Relative Humidity Sensor
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The HMP50 measures both temperature and relative humidity and is suitable for long-term, unattended monitoring. The humidity component features a field-replaceable chip, which eliminates downtime typically required for the recalibration process. The HMP50 is compatible with all Campbell Scientific data loggers.

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Benefits and Features

  • Field-replaceable humidity chip eliminates recalibration down time
  • Can be mounted to a tower/tripod mast or crossarm


Technical Description

The HMP50 measures temperature with a 1000 Ohm platinum resistance thermometer (PRT) and relative humidity (RH) with a 50Y Intercap capacitive chip. The chip is field-replaceable, which eliminates the downtime typically required for the recalibration process. This temperature and RH sensor is compatible with all Campbell Scientific data loggers.

The HMP50 should be housed in a solar radiation shield—typically the 41303-5A. The 41303-5A 6-plate naturally aspirated shield attaches to a mast, crossarm, or tower leg.


Supply Voltage 7 to 28 Vdc (typically powered by data logger’s 12 V supply)
Current Consumption 2 mA (typical)
Housing Material Chrome-coated aluminum and chrome-coated ABS plastic
Operating Temperature Range -40° to +60°C
Diameter 1.2 cm (0.47 in.)
Length 7.1 cm (2.8 in.)
Weight 0.05 kg (0.1 lb) with 1.83-m (6-ft) cable

Relative Humidity

Sensor Vaisala’s INTERCAP capacitive chip
Measurement Range 0 to 98% RH (non-condensing)
  • ±3% (0% to 90% range)
  • ±5% (90% to 98% range)
Temperature Dependence See graph in product brochure.


Temperature Sensor 1000 ohm Platinum Resistance Thermometer
Measurement Range -40° to +60°C
Accuracy See graph in product brochure.


Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.


Product Compatible Note
CR1000 (retired)
CR1000 (retired)
CR200X (retired)
CR216X (retired)
CR5000 (retired)
CR9000X (retired)

Additional Compatibility Information


The HMP50 is typically housed in a 41303-5A 6-plate naturally aspirated shield.

It may also be housed in a 41003-5 10-plate shield if additional hardware is used. A 41322 Adapter Plate allows the HMP50 to be mounted in the lower part of the 41003-5 10-plate shield. Alternatively, a 41381 extension tube and the 6637 split nut plug can be used to mount the HMP50 in a higher part of the 41003-5; the #41381 cable is also required.

Both the 41303-5A and the 41003-5 attach to a crossarm, mast, or user-supplied pipe with a 1.0-in. to 2.1-in. outer diameter.

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