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Evaluation of Proximity Warning Devices.

Authors
Hipp-JE; Henson-FD; Martin-PE; Phillips-GN
Source
NTIS: PB/80-144413 :136 pages
Link
NIOSHTIC No.
10001187
Abstract
Three electrostatic field sensing proximity warning devices were tested using full-scale cranes and powerline systems, a scaled model facility, environmental testing facilities, and theoretical- numerical analysis. The design objective of each device is to assist in safe crane operation near overhead powerlines. Several design deficiencies were noted, including inadequate overlap in sensitivity ranges, utilization of vacuum tubes and electromechanical parts, temperature sensitivity, and inaudible alarms. In addition, the testing showed major device limitations including sensitivity to boom orientations and length, polarization- dependent responses, and unreliable operation in the presence of multiple powerline circuits. The multiple powerline circuit problem is intrinsic to electrostatic sensing devices. The remaining deficiencies and limitations are correctable within a state-of-the- art design.
Publication Date
19800101
Document Type
CP; Final Contract Report;
Fiscal Year
1980
NTIS Accession No.
PB80-144413
NTIS Price
A08
Identifying No.
OFR 22-80
NIOSH Division
PRC;
Source Name
NTIS: PB/80-144413
Performing Organization
Southwest Research Institute
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