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Section 1
Introduction
1.1 General Description
Remote Alarm and Alarm/Meter (948A-40 & 948A-50)
The 948A-50 Remote Alarm/Meter continuously indicates the level of radiation at the detector site and provides a
visual and audible indication of a high radiation level on an analog meter, light, and Sonalert. The meter of the
Remote Alarm/Meter is an analog meter scale that indicates in the range of 0.1 to 10
7
mR/h. The light and Sonalert are
actuated when the radiation level exceeds the high alarm set point of the Universal Digital Ratemeter. Both models
have a momentary pushbutton to silence the Sonalert. The 948A-40 and 948A-50 enclosures are Steel. The 948A-40 is
identical with the exception that it has no analog meter. Refer to Appendix A for drawings.
1.2 Application
The remote alarm/meter is an actual component of the 945 and 945A Wide Range Area Monitoring System. A typical
Wide Range Area Monitoring System consists of the following VICTOREEN instruments: a 977-series Ion Chamber
Detector, a 946A-200 Universal Digital Ratemeter (UDR), and a 948A-50 Remote Alarm/Meter or 948A-40 Remote
Alarm. When used with 977-201 detectors, refer to Loop Diagram 945-3 for interconnection information. When used
with 977-210 detectors, refer to Loop Diagram 945A-3 for interconnection information.
1.3 Specifications
Specifications for the 948A-40 Remote Alarm and the 948A-50 Remote Alarm/Meter are shown below.
Power Requirement 12 VDC for the Sonalert, relay, and light
0 to 10 VDC for the meter of the 948A-50 (supplied by the detector)
Recommended Cable P/N 50-150
Cable Length 1500 ft (457 m)
Operating Temperature 32° to 122°F (0° to 50°C)
Storage Temperature 32° to 122°F (0° to 50°C)
Relative Humidity 0 to 95%, non-condensing
Housing Material Steel
Dimensions, Enclosure 8 (w) x 4 (d) x 10.25 in (h)
(20.3 x 10.2 x 26 cm)
Dimensions, Overall 8.94 (w) x 4.62 (d) x 11.5 (h)
(22.7 x 11.7 x 29.2 cm)
Weight 8 lb (3.6 kg)