Model 375/2

Digital Area Monitor

Part Number: 48-2410

Features

• Affordable Area Monitor
• 1µSv/h to 10 mSv/h (0.1 mR/hr to 1 R/hr)
• Integrated Design
• Battery Backup
• Networkable (Requires Ethernet or Webpage Interface Option)
• Audio & Visual Alarms

The Model 375/2 Digital Wall-Mount Area Monitor is designed for visibility and ease of use. This monitor incorporates an internally-housed energy compensated GM detector with a range from 1 µSv/h to 10 mSv/h (0.1 mR/hr to 1 R/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. Calibration is easily accomplished by moving the cal dipswitch to the right, and using the pushbuttons to increment or decrement 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. A battery backup provides 48 hours of additional use after the primary power is removed.

Medical Applications

With the addition of either of the optional Remote Alarm modules, the Model 375/2 can be used to provide continuous monitoring of (normal) background radiation in radioactive material preparation and work areas such as Nuclear Medicine Hot Labs. The system can also be used for monitoring of Teletherapy (Cobalt) Treatment rooms, notifying personnel that the source is exposed and in-use.

• Specifications
• Options
• Documents
• Replacement Parts

• Specifications
• Options
• Documents
• Replacement Parts

Specifications

Indicated Use	Gamma monitoring
Detector	Energy-compensated GM
Operating Range	1 μSv/h to 10 mSv/h (0.1 mR/hr to 1 R/hr)
Display	4-digit LED display with 2 cm (0.8 in.) character height
Display Range	000.0 to 9999 (Series One: 00.00 to 9999)
Display Units	Can be made to display in μR/hr, mR/hr, R/hr, μSv/h, mSv/h, Sv/h, μrem/hr, mrem/hr, rem/hr, cpm, cps, and others
Linearity	Readings within 10% of true value with detector connected
Response	Typically 3 s from 10% to 90% of final reading
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) Low Bat: Yellow light, indicates less than 2 hours of battery power remaining Overload: Senses detector saturation (indicated by display reading “-OL-”) Overrange: Indicates radiation field being measured has exceeded counting range of instrument
Calibration Controls	Accessible from the front of instrument (protective cover provided)
High Voltage	User-adjustable from 450 to 2500 V
Dead Time	User-adjustable to compensate for dead time of the detector and electronics (can be read off the display)
Audio	Can vary from approximately 68 dB to 100 dB through operation of the external rotary baffle and the internal voltage connection
RS-232 Output	A 2-second dump for computer data logging
Remote Display	Optional relay output available for connecting remote displays (see remote display options)
Ethernet	Optional 10 Base-T connection for use with Ludlum Model 375 software
Temperature Range	-15 to 50 °C (5 to 122 °F) May be certified for operation from -40 to 65 °C (-40 to 150 °F)
Power	9 Vdc wall-mount adapter with four sets of prongs for almost any style wall receptacle
Battery Life	48 hours in non-alarm condition (typical) 12 hours in alarm condition (typical)
Battery Charger	Battery is continuously trickle charged when the instrument is connected to line power and turned on
Construction	Aluminum housing with ivory powder-coat finish
Size (H x W x L)	18.7 x 24.6 x 6.4 cm (7.4 x 9.7 x 2.5 in.)
Weight	2.1 kg (4.7 lb)

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Options

Option	Description	Part Number
Model 375 Series Options	Various options are available for the Model 375 Series including: Enclosures Remote displays Alarm annunciators Signal outputs Software & networking options	Various

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Documents

• Data Sheet
• Product Manual
• Ethernet Manual Addendum (for instruments with ESP32 Ethernet board)
• CE Certificate

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Replacement Parts

Description	Part Number
GM Tube	01-5295

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