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Relative Humidity Sensor Troubleshooting and FAQs

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  • Created May 7, 2005
  • Updated May 12, 2009
  • Article #1408

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Relative Humidity Sensor, order code RH-BTA, $69
Specifications and User Guide

TROUBLESHOOTING
-Primary Test: Plug the sensor into a LabPro and run the data-collection program. Check the readings on the default screen of Logger Pro, DataMate, or Data Pro. Move the sensor to two places (one can be a container with a small amount of calcium chloride for low humidity; the other can be a container with a small amount of warm water for higher humidity). Confirm that the relative humidity readings change in a logical manner.

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SPECIFICATIONS
-new order code: RH-BTA
-old order code: RH-DIN
-Range: 0 to 95%
-Power: 200 microAmps @ 5 VDC
-Response Time (time for a 90% change in reading): in still air: 60 minutes (typical); with vigorous air movement: 40 seconds (typical)
-Resolution, 10-bit (CBL, CBL 2, original ULI): 0.16% RH
-Resolution, 12-bit (LabPro, Go! Link, ULI II, Serial Box): 0.04% RH

SPECIFICATIONS FOR THE IH-3602-L INTEGRATED CIRCUIT HUMIDITY SENSOR (at 25 deg C and 5 VDC)
-Total Accuracy (with saturated salt calibration): +/-2% RH
-Total Accuracy (with standard calibration): +/-10% RH
-Operating Temperature Range: 0 to 85 deg C
-Temperature Effect on 0%RH voltage: +/-0.007% RH/deg C (negligible)
-Temperature Effect on 50%RH voltage: -0.11% RH/deg C
-Temperature Effect on 95%RH voltage: -0.22% RH/deg C

CALIBRATION
-Calibrate? No. The sensor is set to match the stored calibration before shipping.
-For greatest accuracy, calibrate the sensor. There are two calibration options. Option One: compare the readings with another instrument that measures relative humidity (easier). Option Two: conduct a two-point calibration. To do this, you must prepare two containers with moistened salts. This process is time-consuming. Refer to the sensor booklet for a detailed set of instructions and a table of salts with relative humidities for five different temperatures.

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