Casella CEL Indoor air quality monitor - Manual (Page 31)

12.3 Solid State Temperature
and Humidity Probe
This sensor combines two transducers into a
single probe allowing for the measurement of both
temperature and relative humidity to be made
simply and quickly.
The relative humidity transducer is based on a
Capacitive element using “Thin Film” technology,
while the temperature transducer uses a Ceramic
based “Platinum Resistance Wire” technology.
The relative humidity readings are temperature
compensated to reduce the error due to changes
in ambient temperature.
Specification
Relative Humidity
Type Capacitive
Operating Range 10% to 98% RH
Calibration Accuracy ±2% RH (inc. hysteresis)
Response Time (T
90
) 2.5 S
Calibration Check once per year
Calibration Hysteresis ±5%
Hysteresis at 20
o
C ±5% RH
Long Term Stability Better than 15 over one year
Calibration Check Points 35%, 80% & 10% RH
Overall Total Accuracy ±3% RH
Linear Voltage Output 0 to 1 V DC for 0 to 100% RH
Temperature Transducer
Type
Operating Range
Calibration Accuracy
Response Time (T
90
)
Calibration
Calibration Hysteresis
Linear Voltage Output
Sensor Specifications
Page 31 of 42
MICROTHERM indoor air quality &
WinIaq Application Software - User Manual