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Ludlum Model 192

MicroR Radiation Survey Meter

Introduction

● High Sensitivity Gamma MicroR Meter

● 0 to 5000 µR/hr Range

● Internal 2 x 1 in. NaI(Tl) Scintillation Detector

● 4 Decade Analog Meter

● Dual Action Alarm

● Rugged

The Ludlum Model 192 is a high-sensitivity gamma radiation MicroR survey meter employing an internally housed 2.0 in. diameter by 1.0 in. thick (5.1 x 2.5 cm) 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 the four-decade range, instrument shut-off and battery test, an audio on/off switch, a fast/slow response switch, and a reset button. The aluminum cast instrument housing with its 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 turn key system and includes two "D" cell batteries.

Specifications

PART NUMBER: 48-2945

APPLICATION: low-level (μR) gamma radiation survey
RANGE: 0-5000 µR/hr (0-50 µSv/h)

RADIATION DETECTOR: 2.0 in. diameter x 1.0 in. thick (5.1 x 2.5 cm) NaI(Tl) scintillator
SENSITIVITY: typically 700 cpm/µR/hr (7 cpm/μSv/h) for ¹³⁷Cs gamma
ENERGY RESPONSE: energy dependent

LINEARITY: reading within 10% of true value
METER: 2.5 in. (6.4 cm) arc, 1 mA analog type

METER FACE: 0-5 µR/hr, BAT TEST (others available)

ALARM: dual action alarm

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.
Deviation: a quick alarm that is based on background radiation levels. When the instrument is turned on, it takes an 8 second 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 second, and the lamp will flash.

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, re-accumulate background data and recalculate the alarm point

Audio Switch: for audio on/off, built-in unimorph speaker, greater than 60 dB at 2 ft (0.6 m)

Calibration Controls: accessible from front of instrument (protective cover provided)

TEMPERATURE RANGE: -4 to 122 °F (-20 to 50 °C), may be certified from -40 to 150 °F (-40 to 65 °C) BATTERY LIFE: typically 600 hours with alkaline batteries (battery check on meter)

SIZE: 6 x 3.5 x 7.6 in. (15.2 x 8.9 x 19.3 cm) (H x W x D)
WEIGHT: 5 lb (2.3 kg), including batteries

CE CERTIFIED: yes

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