Model 192

microR Survey Meter

Part Number: 48-2945

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.

Specifications

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

Meter Faces

This table lists the most commonly used meter faces. Others are available upon request.

Meter Face	Image (click to view larger)	Description
202-912		0 - 0.05 µSv/h BAT TEST
202-923		0 - 50 nSv/h BAT TEST
202-939		0 - 40 cps BAT TEST

Options

Option	Description	Part Number
Overload Indicator Option	Adds Overload indicator with a light.	4464-130
Detector Clips	Stainless steel clip attaches to instrument handle or case facilitating one-handed carrying of instrument and detector.	Depends on detector.
Lighted Handle	Handle with LED to illuminate the instrument display.	4464-154
Shoulder Strap	Adjustable nylon shoulder strap.	4363-413
Transport & Storage Case - Small	Rugged, dust- and waterproof transport and storage case.	2311062
Plastic Disk Check Sources	General purpose check sources used to check instrument response.	Depends on source material and activity.

Description	Part Number
Detector Assembly	47-2951