This product is no longer available and has been replaced by: HYGROVUE5.
CS215-PWS Temperature and Relative Humidity Probe for PWS100
Services Available
Repair Yes
Calibration No
Free Support Yes


The CS215-PWS is a temperature and relative humidity probe with a special connector on the cable for attaching to a PWS100.  It uses a Swiss-made digital humidity and temperature element that makes accurate and stable measurements. The CS215-PWS outputs an SDI-12 signal measurable by most Campbell Scientific data loggers.

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Benefits and Features

  • Accurate and stable measurements
  • Field changeable element allows on-site recalibration
  • Each sensor element is individually calibrated so no further adjustment of the probe is required
  • Low power consumption
  • Digital SDI-12 output
  • Simple data logger programming


Detailed Description

For this version of the CS215 Temperature and RH Probe, the cable has, instead of pigtails, a connector for attachment to the PWS100. 

The CS215 uses the Sensirion SHT75, a combined relative humidity and temperature element, to provide accurate, stable measurements. The Sensirion SHT75 element is field-replaceable, eliminating the downtime typically required for the recalibration process. The CS215 outputs an SDI-12 signal that's measurable by many Campbell Scientific data loggers.

The CS215 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.


Sensing Element Sensirion SHT75
Communication Standard SDI-12 V1.3 (responds to a subset of commands)
Supply Voltage 6 to 16 Vdc (typically powered by data logger’s 12 V supply)
Typical Current Drain
  • 120 μA (quiescent)
  • 1.7 mA (measurement takes 0.7 s)
EMC Compliance Tested and conforms to IEC61326:2002.
Operating Temperature Range -40° to +70°C
  • 1.2 cm (0.5 in.) at sensor tip
  • 1.8 cm (0.7 in.) at cable end
Probe Length 18.0 cm (7.1 in.) including strain relief
Cable Length 10 m (33 ft)
Weight 350 g (12.3 oz) with 10-m (33-ft) cable

Relative Humidity

Measurement Range 0 to 100% RH (-20° to +60°C)
Output Resolution 0.03% RH
  • ±2% (10% to 90% range) at 25°C
  • ±4% (0% to 100% range) at 25°C
Short-Term Hysteresis < 1% RH
Temperature Dependence Better than ±2% (-20° to +60°C)
Typical Stability ±1.0% per year
Response Time with Filter < 20 s (63% response time in still air)
Calibration Traceability NIST and NPL standards


Measurement Range -40° to +70°C
Output Resolution 0.01°C
  • ±0.3°C (at 25°C)
  • ±0.4°C (5° to 40°C)
  • ±0.9°C (-40° to +70°C)
Response Time with Filter < 120 s (63% response time in air moving at 1 m s-1)


For this version of the CS215 Temperature and RH Probe, the cable has, instead of pigtails, a connector for attachment to the PWS100. Cable length is 1 meter.


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