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Ludlum Model 3-IS

Intrinsically Safe Radiation Survey Meter

Introduction

Ludlum Model 3-IS Intrinsically Safe Radiation Survey Meter ● Intrinsically Safe General Purpose Radiation Survey Meter

● Surveys in Potentially Explosive Environments

● 4 Decade Analog Meter

● Supports GM and Scintillation Detectors

● Rugged

The Ludlum Model 3-IS 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. The Model 3-IS can only be used with select detectors to sustain the intrinsic safety rating. It is shown with the optional Model 44-9 detector on right.

The optional detectors for this application are:

Model 44-9: 15 cm²GM pancake probe

Model 44-2: 1 x 1 in. (2.5 x 2.5 cm) NaI scintillator

Model 44-6: GM gamma probe with beta window

Model 44-38: energy compensated GM probe with beta window

Model 42-41L: proton recoil type neutron detector

Like the Model 3 before it, the 3-IS retains the well-deserved reputation for 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. 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.

Specifications

PART NUMBER: 48-3581

APPLICATION: alpha, beta, gamma, neutron radiation surveying in potentially explosive environments

RADIATION DETECTOR: supports select Ludlum radiation detectors (see list above) that can be purchased separately

DETECTION RANGE: typically 0-200 mR/hr, or 0-500,000 cpm

LINEARITY: reading within 10% of true value with detector connected

HIGH VOLTAGE: adjustable from 400-1000 Vdc

THRESHOLD: fixed at 40 mV ±10 mV

METER DIAL: 0-2 mR/hr, or 0-500 kcpm, 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

CONNECTOR: series “C” with locking screws to prevent inadvertent disconnection during operation

TEMPERATURE RANGE: -4 to 122 °F (-20 to 50 °C)
POWER: two each “D” cell batteries (housed in 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: