Model 375/1

Digital Area Monitor

Part Number: 48-3831

The Model 375/1 Digital Wall-Mount Area Monitor is designed for visibility and ease of use.

 This monitor incorporates an internally housed 18 mm CsI scintillator with a sensitivity of approximately 120 cpm per µR/hr. It features a wall-mount chassis and a four-digit LED display that is readable from 9 meters (30 feet) away. Backlit indicators warn of low radiation (yellow), high radiation (red), instrument failure (red), and low battery (yellow), along with an alarm. A green status light indicates the instrument is functioning properly.

Parameters are protected under a calibration cover that provide access to adjusting the calibration constant, dead time correction, and alarm point parameters. Parameters are stored in non-volatile memory (retained even with power disconnected). A five-decade logarithmic analog output is provided.

Options available include remote displays, an Ethernet port, alarm relay output, and a NEMA 4 outdoor enclosure.

Note: While the detector used in this instrument is sensitive and is often used for detection of near-background levels of radiation, its nonlinear energy response means that does and exposure measurements may be over/underreported.


  • Affordable Area Monitor

  • Range: 0.1 to 9999 µR/hr

  • Compact, Integrated Design

  • Low Background Sensitivity

  • Audio & Visual Alarms

  • Networkable (Requires Ethernet or Webpage Interface Option)




Detector18 mm CsI detector (nonlinear energy response, see Energy Response Curve in the Graphs tab)
Sensitivity120 cpm per µR/hr
Measurement Range0.1 to 9999 µR/hr (alternately 0.01 to 99.99 mR/hr)
Display4-digit LED display with 2 cm (0.8 in.) characters
Display UnitsµR/hr (other units available upon request)
Status Indicators
  • Instrument Status: Green light indicates instrument is functioning properly
  • Low Alarm: Yellow light and slow beep (1/sec) audible tone (can be set at any point from 0.0 to 9999)
  • High Alarm: Red light and fast beep (4/sec) audible tone (can be set at any point from 0.0 to 9999)
  • Overload: Senses detector saturation (indicated by display reading “-OL-”)
  • Overrange: Indicates radiation field being measured has exceeded counting range of instrument
AudioIntensity can vary from approximately 68 dB to 100 dB through operation of the external rotary baffle and the internal voltage connection. Frequency is approximately 3 kHz
Remote DisplayOptional relay output available for connecting to remote displays (see remote display options)
Temperature Range-20 to 50 °C (-4 to 122 °F)
Power9 Vdc wall-mount adapter handles any mains voltage in the world, supplied with four sets of prongs for almost any style wall receptacle
Battery Life48 hours in non-alarm condition (typical)
12 hours in alarm condition (typical)
Battery ChargerBattery is continuously trickle charged when instrument is connected to line power and turned on
ConstructionAluminum housing with ivory powder coat
Size (H x W x L)18.7 x 24.6 x 6.4 cm (7.4 x 9.7 x 2.5 in.)
Weight2.1 kg (4.7 lb)



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