Relative Humidity Measurement Solution
Four Channel RH and Temperature Data Logger
SmartReader 2 is a data logger for easy and reliable tracking of “air quality” conditions. It has a built-in remperature sensor and a plug-in Relative Humidity sensor. The Relative Humidity sensor is field replaceable so you can always be assured of accurate readings.


No. of Channels - Four. (One for the internal temperature sensor, one for the internal RH sensor, one for optional external RH and one for optional external temperature or resistance).
Relative Humidity Sensor - Capacitive thin polymer film.
Range - 0 to 95% (non-condensing).
Accuracy - +/-4% RH from 10 to 90% (-20 to 40ºC [-4 to 104ºF]).
Resolution - Better than 0.4% between 25 & 60% RH at 25º C (77ºF).
Response Time - Adequate ventilation reduces the response time which is approximately 5 minutes in still air.
Memory Size - 32 KB.
Environmental Conditions - Like all relative humidity sensors, when exposed to contaminants and/or extreme environmental conditions, accuracy degradation could result. For maximum longterm stability, sensor should not be exposed or subjected to organic solvents, corrosive agents (strong acids, SO2, H2SO4, CI2, HCl, H2S, etc.), and strong bases (compounds with PH greater than 7). Dust settling on the sensor surface will not affect sensor performance except possibly to decrease the speed of response. For more information on the RH sensor’s tolerance to chemicals, see Accessories section under Relative Humidity.
Accessories - ACR EH-020A Temperature & RH Probe. ACR ET Series Temperature Probe.


  • 4 channels
  • 10-year battery life
  • User-configurable
  • Accessible remotely by modem
  • Network capable
  • N.I.S.T. traceable measurements
  • Includes calibration certificate