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Digital Thermometer with Thermistor Probe

  • Recommended In Production

    Explanation of Product Status

    Under Development Products under development
    Please contact us for product availability and sample lead-time.
    In Production Product is in mass production.
    to be discontinued Not recommended for new designs. We are evaluating the schedule for the discontinuing of production of this item. Contact Murata or refer to the website for details of product supply and possible alternative product information.
    Discontinued product Production of this product has stopped. Contact Murata for inventory availability and possible alternative products.
    Recommended product This product is particularly recommended among our products currently in production.
    New product It's new item.


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Technical Information

Series DMR20-1-TMP
Series Headline AC or DC Powered Digital Thermometer with Thermistor Sensor
Series Description

Murata Power Solutions’ new DMR20-1-TMP thermistor-input thermometer modules provide a simple cost-effective way to accurately measure air temperatures from -40 to +221°F (-40 to +105°C). The user can choose between Celsius or Fahrenheit readings via a rear pc-board jumper. Each thermometer is supplied with an epoxy-dipped NTC thermistor probe and is factory-calibrated to a typical accuracy of ±1°F. The probe features 18 inch (46cm) long leads to allow for remote installation.

Operating power can be from either 24Vac (50/60Hz) or 6 to 50V DC supplies. Two display-brightness levels are provided to ensure optimal readability under various ambient lighting environments. Typical power consumption from a 12 or 24Vdc supply is 3mA in the low brightness setting, and 5mA in the high-brightness setting. A built-in resettable fuse assures long term reliability, and all units are reverse polarity protected to -75Vdc.

Their large, 0.30 in./7.6mm, bright LED displays can be easily read from 10 feet away (3 meters). Visual indications alert the user to over / under temperature conditions, as well as an open or shorted thermistor. DMR20-1-TMP thermometers employ a precision 0.2% voltage reference and metal-fi lm resistors to achieve outstanding performance over an operating ambient temperature range of –25 to +60°C. The DMR20-1-TMP features a round polycarbonate housing that provides excellent protection against moisture, dust, shock and vibration. The supplied hardware is designed to provide moisture ingress protection to IP67/NEMA 6. Panel installation is straightforward: using available tooling, punch a 1.2 inch (30.5mm) diameter hole, insert the thermometer and gasket into the panel, and securely fasten using the supplied plastic hex nut.

Measurment Type Temperature
Measuring Range -40 to +221°F (-40 to +10°C)
Accuracy ±1°C
Display Type LED
Color Red
Number of Digits 3
Digit Height (inch) 0.3
Digit Height (mm) 7.6
Update Rate (samples /sec) 1
Power Supply Type DC Powered
Power Supply (V) 6 to 50Vdc or 24Vac
Loop Drop (V) n/a
Power Supply Current (mA) 6
Operating Temp. Range (C) -25 to 60
Mounting Type Panel Mount
Humidity 0 to 85%
Weight (oz) 0.74
Weight (g) 21
Case Material Polycarbonate
RoHS 6 Yes
Sensor Type NTC Thermistor