Model 3-IS Radiation Survey Meter

Intrinsically Safe

Model 3-IS Intrinsically Safe, Radiation Survey Meter Model 3-IS Intrinsically Safe, Radiation Survey Meter, control board

Features

This intrinsically safe general purpose ratemeter 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. The Model 3-IS can only be used with select detectors to sustain the intrinsic safety rating. Click the tab below to view compatible detectors.

Like the Model 3 before it, the 3-IS retains the well-deserved reputation for accuracy and long-lasting dependability. The cast aluminum 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. The analog meter comes in a variety of measurement ranges and units to support the external radiation detector selected.

A one meter (39 in.) straight type detector cable equipped with special connectors designed to prevent quick or accidental disconnection in the field is included in the price of the instrument.

WARNING: Use only Duracell Procell PC1300 1.5 V type "D" batteries. To reduce the risk of ignition of a flammable or explosive atmosphere, batteries must be changed only in a location known to be a non-hazardous area.

WARNING: When repairing this unit, substitution of components may impair intrinsic safety.

Specifications

Application Alpha, Beta, Gamma, or Neutron surveying in potentially explosive environments
Compatible Detectors Supports select Ludlum radiation detectors (see Compatible Detectors tab) that can be purchased separately
Detection Range Typically 0 to 200 mR/hr, or 0 to 500 kcpm
Linearity Reading within 10% of true value with detector connected
Meter Dial 0 to 2 mR/hr, or 0 to 500 kcpm, BAT TEST (others available)
Meter 6.4 cm (2.5 in. arc), 1 mA analog type
Controls

High Voltage Adjustable from 400 to 1000 Vdc
Threshold Fixed at 40 mV ± 10 mV
Temperature Range -20 to 50 °C (-4 to 122 °F)
Power Two each Procell PC1300 “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
Connector Series "C" with locking screws to prevent inadvertent disconnection during operation
Size (H x W x L) 16.5 × 8.9 × 21.6 cm (6.5 × 3.5 × 8.5 in.), including handle
Weight 16 kg (3.5 lb), including batteries
Intrinsically Safe Certification Class I, Division 1, Groups A, B, C, and D, T6

Ludlum Model 3IS manual

Manual