NIOSHTIC-2 Publications Search

Alarm System for Radiation Working Level, Fan Operation, and Air Door Position.

Franklin JC; Barr PE; Weverstad KD; Sheeran CT
MISSING :17 pages
A 32-channel continuous monitoring system has been developed to monitor radiation working level (wl), fan operation, and air door position. The system consists of a surface receiver unit and an underground transmitter that is connected to the various monitors. A continuous wl monitor used with the system can generate alarms at two different wl readings. One of these levels is variable from 0.00 to 0.99 Wl and generates an alarm on the surface receiver. The other level fixed at 1.0 Wl, generates an underground alarm in the vicinity of the monitor. The detectors for fan operation and air door position work on the principle of a completed circuit to the underground transmitter (multiplexer). When the circuit is broken, as is the case when a fan is off or an air door is open, an alarm is generated at the surface receiver. This alarm remains in effect until the circuit is completed, signifying the fan has been turned on or the air door has been closed.
Publication Date
Document Type
IH; Information Circular;
Fiscal Year
Identifying No.
IC 8903
NIOSH Division
Source Name
Page last reviewed: November 12, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division