Models 375-31H Area Monitor with Neutron Detector
Section 1
Ludlum Measurements, Inc.
Page 1-1
January 2021
Introduction
he Model 375-31H Area Monitor with Neutron Detector is a versatile,
compact, and easy-to-use digital electronic controller designed for
monitoring radiation in areas. Its simple design accommodates many
different detectors to suit a wide variety of applications, and it is
equipped with a local readout and alarms. These versatile units may also be
connected to an optional auziliary indicator/annunciator to alert personnel at
remote locations.
The 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).
The user-friendly digital design enhances setup and operation. The Model 375-
31H units may also be networked to a central PC-based station where data are
logged and alarms posted.
This affordable and very flexible system has found its way into many
applications resulting in a full complement of detectors, accessories, and
options that include remote indicator alarms, printers, relay outputs, weather-
proof enclosures, Ethernet networking software, industrial cameras, and more.
Sites requiring centralization of their data can link multiple systems together via
Ethernet and view them using a common web browser with the purchase of
Ludlum’s Webpage & Service Software. See that manual for more information.
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