Ludlum General Purpose Alarming Ratemeter - Model 3A (DTRD213)
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SPECIFICATIONS:
APPLICATION: alpha, beta, and gamma surveying
DETECTION RANGE: typically 0-200 mR/hr, or 0-500,000 cpm
COMPATIBLE DETECTORS: GM, scintillation (see complete list)
LINEARITY: reading within 10% of true value with detector connected
HIGH VOLTAGE: adjustable from 400-1500 Vdc
THRESHOLD: fixed at 40 mV ± 10 mV
METER DIAL: 0-2 mR/hr, or 0-500 kcpm, BAT TEST (see all available dials)
METER: 6.4 cm (2.5 in.) arc, 1 mA analog type
ALARM: indicated by red lamp on front panel and audio going to constant tone. The alarm circuit on the Model 3A is triggered by meter deflection.
CONTROLS:
1. Rotary Selector: switches between instrument off, battery check, ranges: x0.1, x1, x10, x100
2. Response Switch: toggles between FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading
3. Reset Pushbutton: to zero meter
4. Audio Switch: for audio on/off, built-in unimorph speaker, greater than 60 dB at 0.6 meters (2 ft)
5. Calibration Controls: accessible from front of instrument (protective cover provided)
CONSTRUCTION: cast and drawn aluminum with beige powder coat
CONNECTOR: series “C”
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 each “D” cell batteries (housed in externally accessible sealed compartment)
BATTERY LIFE: typically greater than 2000 hours with alkaline batteries (battery condition can be checked on meter)
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
WEIGHT: 1.6 kg (3.5 lb) including batteries
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