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THT-HR Data Logger

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The THT-HR is a small Three Channel High Resolution (10 bit) Humidity and Temperature Datalogger. The humidity and temperature sensors are housed in a 60 micron Stainless Steel filter at the top of the logger. There is an additional external temperature sensor with a soil penitration probe and 1500mm of cable. The THT-HR loggers now use a 
Sensirion SHT11 humidity sensor. Specification of the older stlye THT-HR using the Humirel 1101 sensor can be found here . A general calibration certificate for all Sensiron Sensors is available from the Sensiron Web Site 

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Sensor Type
Sensirion SHT11
Digital humidity sensor
Long-term stability
Fully calibrated by Sensirion
Response time 4 seconds
Range 0%~100%
Accuracy ± 3.5%RH from 10% to 90%
± 5%RH from 0% to 10% and 90% to 100%
Resolution 0.5%RH
Filter 60 micron Stainless Steel
Internal Temperature:
Sensor Type Thermister
Linear accuracy over range ± 0.3º C (0º C to 70º C)
Repeatability ± 0.1º C
Long term stability ± 0.1º C
External Temperature:
Sensor Type Thermister
Probe Type Sharpened Stainless Steel 140mm X 5mm
Probe Cable Tefsel 1500mm
Working Temperature -30º C to +110º C
Linear accuracy over range ± 0.3º C (0º C to 70º C)
Repeatability ± 0.1º C
Long term stability ± 0.1º C
Working Temperature -30º C to +70º C
Storage Temperature -30º C to +70º C
Sampling Rate
1 second minimum
10 hours maxium
in 1 second intervals
Storage capacity
64,000 8 bit samples
32,000 12bit samples
Two independent Alarms
Triggered on any combination of six user configurable Alarm Conditions
One alarm can be configured to dial a PocketPager
Alarms can be visually checked using the Omnilog Software
Start modes
Start immediately
Start on date/time.
Stop modes
Stop when memory is full
Stop on date/time
Loop around (continues logging)
Logging Modes
Each channel can be set to log any combination of: 
  • Point readings
  • Average reading
  • Maximum reading
  • Minimum reading
Factory Replaceable
One ½ AA 3.6V lithium cell
Five year life. 
The data is retained in the case of battery failure.
Battery Status Monitor in OmniLog Software
Download Time 35 seconds for Full Logger
Case material 304 Stainless tube
Screw on end cap Plated brass
Weight 110g
Size 20mm diameter X 144mm long
1500mm external temperature cable
Sharpened Stainless Steel penitration probe
140mm X 5mm

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