Models 375 (Including Series One), 375/1, 375/2 & 375/4 Section 1
Ludlum Measurements, Inc. Page 1-1 May 2017
Introduction
he Model 375 Digital Wall-Mount Area Monitor is designed for
visibility and ease of use. Featuring a wall-mount chassis, the Model
375 has a four-digit LED display that is readable from 9.1 m (30 ft)
away. Backlit indicators warn of low-radiation alarm (yellow), high-
radiation alarm (red), instrument failure (red), and low battery (yellow). A green
status light is a positive indication of instrument operation.
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. Depending on
the needs of the customer, the Model 375 comes equipped with an internal
detector or a connector for use with an external detector. The Model 375/1
comes equipped with an internal CsI scintillator detector. The Model 375/2
and 375/4 come equipped with internal, energy-compensated GM detectors.
The Ludlum Model 375 Series One is a Model 375 with modified firmware.
Changes include certain display values in decimal points and units. Details can
be found in sections “Getting Started” and “Specifications.”
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