The Ludlum Model 3-IS - The universal INTRINSICALLY SAFE survey meter.It was designed and tested to USA standards for instrinsic 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. The optional detectors for this application are:
- Model 44-9: 15 cm2 GM pancake probe
- Model 44-2: 2.5 x 2.5 cm (1 x 1 in.) NaI scintillator
- Model 44-38: energy compensated GM probe with beta window
The Ludlum Model 3 can be customized to suit any application. Universal meter body can be paired with any Ludlum probe. This meter can only be calibrated to one probe at a time.
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.
A one meter (39 in.) straight type detector cable with "C" style connector is included in the price of the instrument.
Meter Body:
| Indicated Use | Dependant on probe selection |
|---|---|
| Linearity | Reading within 10% of true value with detector connected |
| High Voltage | Adjustable from 400-1500 Vdc |
| Threshold | fixed at 40 mV to 10 mV |
| Meter | 6.4 cm (2.5 in.) arc, 1 mA analog type |
| Controls |
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| Construction | cast and drawn aluminum with beige powder coat |
| Temperature Range | -20 to 50 °C (-4 to 122 °F), may be certified for operation from -40 to 65 °C (-40 to 150 °F) |
| Power | Two "D" Cell Batteries |
| Battery Life | Typically greater than 2000 hours with alkaline batteries |
| Size | 16.5 x 8.9 x 21.6 cm (6.5 x 3.5 x 8.5 in.) (H x W x L), including handle |
