Q-S161 RH/Temp. Sensor
back of the instrument
Q-S161 RH/Temp. Sensor back of the instrument
Q-S161 RH/Temp. Sensor

Qubit Systems’ combined Q-S161 RH/Temp Sensor allows simultaneous measurements of relative humidity and gas temperature at the RH sensor. Water vapor concentration can then be calculated in absolute units. No calibration is needed if used with  C901 Logger Pro software and the associated calibration files (factory calibrated).  We recommend the use of C610 LabQuest Mini data acquisition interface with Q-S161 for logging relative humidity of a gas and the temperature at the RH sensor.

The Q-S161 RH/Temp  Sensor has the relative humidity  range from 0 to 100% with 1% resolution and temperature range  from 5 to 60°C with resolution of 0.01°C.

The Q-S161 RH/Temp Sensor is ideal for transpiration measurements in an open-flow gas exchange system. It comes with our Q-Box CO650 Plant CO2 Analysis Packages and Q-Box SR1LP Soil respiration package.

It may also be used to study water loss from animals or to observe RH levels in environmental chambers.

  • Simple operation
  • Two analog outputs (RH and Temp)
  • Flow through RH gas analyzer
  • Two valve adjustments of in and out gas flow
  • 1LPM max flow (no load)

Applications

  • Leaf Transpiration measurements
  • Monitoring of RH in Environmental chambers
  • Studies of water loss from animals
  • Soil Moisture loss studies

RH sensor specifications

thermoset polymer-based capacitive sensor  
Linear voltage output vs %RH  
Low power design  
Accuracy ± 2% RH, 0-100 % RH non-condensing, 25 °C
Linearity ± 0.5% RH Typical
Hysteresis ± 1.2% of RH Span Maximum
Repeatability ± 0.5% RH
Response Time 15 s in slowly moving (200ml/min) gas @ 25 °C
Stability ± 1% RH Typical at 50% RH in 5 Years
Range 0 to 100% RH, non-condensing
Operating Temperature Range 5 °C to 60 °C
Temperature Compensation True RH = Sensor RH/(1.0546-0.00216T) T in °C (True RH = Sensor RH/(1.093-0.0012T) T in °F)
Chemically resistant  
0%RH V out =  0.200V
100%RH V out =  4.800V
Slope = 21.739, Offset =  -4.3478
Warranty  1 year

 

Temperature sensor specifications

NTC Chip Thermistor, non-linear response  
Use Steinhart Equation in software for degree Celsius reading 1/(0.000903+0.000226*ln((Volts)*2000000)/(25*5-Volts))+1.11E-007*(ln((Volts*2000000)/(25*5-Volts)))^3)-273.15
Accuracy +/- 0.2C
Range 5°C to +60°C
Power requirements 12VDC, 0.1A
Dimensions H x W x D = 5.5 to 9.5 x 9.5 x 17cm
Weight 900g

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