Model 192 Micro R Meter
Features
- High Sensitivity to Gamma
- Range: 0 to 50 μSv/h (0 to 5000 µR/hr)
- Rugged
- 4-Range Analog Meter
- Dual Action Alarm
The Model 192 is a high-sensitivity gamma μR ratemeter employing an internally housed 5.1 x 2.5 cm (2 x 1 in.) NaI(Tl) detector. This instrument supports two types of alarms: a user adjustable fixed point alarm and a deviation alarm that activates at levels above a floating background. An alarm light is mounted to the front panel and is accompanied by an audio signal.
The front-panel controls include a rotary switch for selecting one of four ranges, instrument shut-off and battery test, an audio on/off switch, a fast/slow response switch, and a reset button. The cast aluminum instrument housing with a separate battery compartment and accompanying metal handle offer an industrial robustness and quality that promote long-lasting protection and instrument life. The Model 192 is a complete turnkey system and includes two "D" cell batteries.
Application Low-level (microR) gamma survey
Detector (D x L) NaI(Tl) scintillator, 5.1 x 2.5 cm (2.0 x 1.0 in.)
Detection Range 0 to 50 µSv/h (0 to 5000 µR/hr)
Sensitivity (137Cs gamma) Typically 650 cpm per µR/hr
Energy Response Energy Dependent
Linearity Reading within 10% of true value
Meter Dial 0 to 5 µR/hr, BAT TEST
(Meter Faces tab lists other available meter faces)
Meter 6.4 cm (2.5 in.) arc, 1 mA analog type
Controls
- Rotary Selector: Switches between instrument off, battery check, ranges: x1, x10, x100, x1000
- Response Switch: Toggles between FAST (4 s) or SLOW (22 s) from 10% to 90% of final reading
- Reset Pushbutton: To zero meter, and also re-accumulate background data and recalculate the alarm point
- Audio Switch: For audio on/off, built-in unimorph speaker, greater than 60 dB at 0.6 m (2 ft.)
- Calibration Controls: Accessible from front of instrument (protective cover provided)
Alarms
This instrument incorporates dual action, latching type alarms:
- A fixed alarm point that can be set at any point from 10% of full scale to full scale, and is indicated by a constant audible tone, and the lamp turning on.
- A quick deviation alarm that is based on background radiation levels. When the instrument is turned on, it takes an 8 s measurement of background radiation levels and determines a deviation alarm setting. If the radiation level exceeds this setting, the alarm audio will beep every 1/8 s, and the lamp will flash.
Battery Life Typically 600 hours with alkaline batteries (battery condition can be checked on meter)
Size (H x W x L) 21.6 x 8.9 x 22.4 cm (8.5 x 3.5 x 8.8 in.) with handle
Weight 2.3 kg (5 lb), including batteries
