●  Gamma Surveys in Potentially Explosive Environments

●  Built-in Energy Compensated GM Detector

●  0.1 mR/hr to 1.0 R/hr Range

●  Rugged

The Ludlum Model 3-IS-1 intrinsically safe general purpose radiation survey meter is patterned after Ludlum's best selling Model 3. It was designed and tested to USA standards for intrinsic safety, permitting it to be used in potentially explosive atmospheres. This instrument includes an internally housed, energy compensated GM radiation detector with a gamma detection range of 0.1 mR/hr to 1.0 R/hr. The Model 3 type instruments are well known for their accuracy and long-lasting dependability. 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 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 count reset button.

APPLICATION: gamma surveying in potentially explosive environments
RADIATION DETECTOR: internally housed energy compensated GM detector
DETECTION RANGE: 0.1 mR/hr to 1.0 R/hr
LINEARITY: reading within 10% of true value

METER DIAL: 0-10 mR/hr, BAT TEST
METER: 2.5 in. (6.4 cm) arc, 1 mA analog type
CONTROLS:

Rotary Selector: switches between instrument off, battery check, ranges: x0.1, x1, x10, x100

Response Switch: toggles between FAST (4 s) or SLOW (22 s) from 10% to 90% of final reading

Reset Pushbutton: to zero meter

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)

CONSTRUCTION: cast and drawn aluminum with beige powder coat

ENVIRONMENTAL RATING: NEMA 3R, constructed for either indoor or outdoor use to provide a degree of protection against dirt, rain, sleet, or snow

TEMPERATURE RANGE: -4 to 104 °F (-20 to 40 °C)
RELATIVE HUMIDITY: maximum 95% (non-condensing)
POWER: two each “D” cell batteries (must use Duracell Procell PC1300 1.5V alkaline to retain intrinsic safety rating) Batteries are housed in an externally accessible sealed compartment.
BATTERY LIFE: typically greater than 2000 hours with alkaline batteries (battery check on meter)

SIZE: 6.5 x 3.5 x 8.5 in. (16.5 x 8.9 x 21.6 cm) (H x W x L), including handle

WEIGHT: 3.5 lb (1.6 kg) including batteries

CERTIFICATIONS:

UL 913 Class I, II & III Division 1 Groups A, B, C, D

CSA 22.22 No. 157

UL 61010-1 CSA C22.2 No. 61010-1

CE Certified