LUDLUM 3-IS-1 Intrinsically Safe Gamma Ratemeter (0.1 mR/hr ~ 1.0 R/hr)

Application: Gamma surveying in potentially explosive environments 

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 with detector connected 

Typical Sensitivity (137Cs): 100 cpm per mR/hr

Meter Dial: 0 to 10 mR/hr, BAT TEST

Meter: 6.4 cm (2.5 in.) arc, 1 mA analog type

Controls   : 

Rotary Selector: Switches between: Instrument off, Battery check, Ranges: ×0.1, ×1, ×10, ×100

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

Reset Push Button: Zero meter

Audio Switch: 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)

Temperature Range: -20 to 50 °C (-4 to 122 °F) 

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

Relative Humidity: Maximum 95% (non-condensing)

Power: Two each “D” cell batteries (see Warning note below). Batteries are housed in an externally accessible sealed compartment.

Battery Life: Typically greater than 2000 hours with alkaline batteries (battery condition can be checked on meter) 

Construction: Cast and drawn aluminum with beige powder coat 

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

Weight: 1.6 kg (3.5 lb), including batteries

Datasheet

Manual