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Compact Circular Temperature and Humidity Data Loggers

Temperature and Humidity Data Loggers


Item# OMYL-RH20-4M

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $461.37
5-9 $438.30
10-24 $429.07
25-49 $410.62
50-99 $401.39
100+ $392.16

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Lead Time ( If not in Stock): 2 weeks

Temperature and Humidity Data Loggers OMYL-RH20-4M OMYL-RH20-4M
  • Integral Temperature/Humidity Sensors
  • OMYL-RH20 Has Internal Temperature/Humidity Sensors
  • OMYL-RH20E Has Temperature/Humidity Sensors Fitted in Integral Probe
  • Up to 4 Million Readings (Internal Memory Size)
  • Up to 4 Hz Sampling Rate
  • High Accuracy
  • 20 Bit A/D Converter
  • Shock Proof, IP65 Housing (Dust and Water Jet Proof)
  • Transfer Rate of 500 kbps
  • Low Current Consumption
  • Up to 4 Years Battery Life

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Measurement Type
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Input Type
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Product Specs

The OMYL-RH20 and OMYL-RH20E are robust devices capable of logging temperature and humidity readings and are software configurable to record either both of these parameters or just individual variables. These data loggers are available with standard memory of 100,000 readings (OMYL-RH20, OMYL-RH20E) or expanded memory of 4 million readings (OMYL-RH20-4M, OMYL-RH20E-4M). The OMYL-RH20/OMYL-RH20-4M have built-in sensors for temperature and humidity. The OMYL-RH20E/ OMYL-RH20E-4M have the temperature and humidity sensors fitted in an integral 100 mm steel probe. These data loggers are suited for a variety of applications including environmental or climate studies, meteorological research and also in clean rooms and laboratories.

The storage medium is non-volatile flash memory so no data is lost if the battery becomes discharged. Data logger setup as well as data retrieval is accomplished using the included standard OMYL-SOFT software. Downloaded data is stored in the OMYL-SOFT software as a text file for viewing in third party software packages or Microsoft Excel. The OMYL-SOFT standard software does not include any graphing functionality. Graphing and analyzing downloaded data files requires the OMYL-SOFT-PLUS version of the software (sold separately).

Sensor Type
    OMYL-RH20/OMYL-RH20-4M: Internal temperature and humidity sensors
    OMYL-RH20E/OMYL-RH20E-4M: Temperature and humidity sensors fitted in integral probe
    Range: -30 to 70°C (-22 to 158°F) with standard lithium battery (included); -40 to 90°C (-40 to 194°F) with optional high
    temperature lithium battery
    Resolution: 0.01°C (0.02°F)
    Accuracy: See chart on PDF
    Range: 0 to 100 %RH
    Resolution: 0.01 %RH
    Accuracy: See chart on PDF
Reading Rate: 1 second to 24 hours; 2 Hz, 4 Hz in fast mode
Start Modes: Immediate start, delayed start
Memory Capacity
    OMYL-RH20, OMYL-RH20E: 100,000 readings
    OMYL-RH20-4M, OMYL-RH20E-4M: 4 million readings
Memory Wrap Around: Yes (software configurable)
Battery: 3V lithium battery [standard temperature range battery (included), optional high temperature range battery]; user replaceable
Battery Life (Standard Temperature Range Battery): 4 years at 1 minute reading rate, 230 days at 10 second reading rate, 25 days at 1 second reading rate
LED Functionality: Integrated status LED indicates data logging status, low battery or alarm condition
Alarms: Software programmable high/low thresholds
Computer Interface: USB (interface cable included)
Software: XP SP3/Vista/7 and 8 (32- and 64-bit)
Operating Environment: -30 to 70°C (-22 to 158°F) with standard lithium battery; -40 to 90°C (-40 to 194°F) with optional high temperature lithium battery
    OMYL-RH20, OMYL-RH20-4M: 30 H x 50 mm dia (1.18 x 1.97')
    OMYL-RH20E, OMYL-RH20E-4M: 30 H x 50 mm dia (1.18 x 1.97') with 100 L x 8 mm dia probe (3.94 x 0.31')
Weight: 70 g (2.5 oz)
Enclosure: Robust, shock-proof POM, IP65

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