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Design Modification of Femco Model 702909 Wireless Ground Monitor.

Authors
Vitt-LP; Ritter-DT
Source
NTIS: PB/262-858 Available for Reference At Bureau Libraries :31 pages
Link
NIOSHTIC No.
10001237
Abstract
This report details the work done to provide the Bureau of Mines with a customized wireless ground monitor system. Femco model 702909 wireless ground monitor was modified as follows: (1) a voltage regulator was added to prevent false trips with line voltage variations, (2) a ground wire trap was designed to eliminate problems with parallel paths and provide spark suppression, (3) a three-phase filter was designed to permit complete test of installed systems, and (4) the design was modified to insure trip with an open ground wire in the event of a failure of any one semiconductor component.
Publication Date
19760101
Document Type
CP; Final Contract Report;
Fiscal Year
1976
NTIS Accession No.
PB-262858
NTIS Price
A04
Identifying No.
OFR 15-77
NIOSH Division
PRC;
Source Name
NTIS: PB/262-858 Available for Reference At Bureau Libraries
State
IN;
Performing Organization
Femco Div., Gulton Ind., Inc.
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