Introduction
The Ludlum Model 2401-P instrument is a general purpose, pocket size radiation detection meter designed around the venerable GM pancake detector. The detector is conveniently packaged inside the instrument with a protective screen window. The meter presents two scales, CPM for contamination measurements and mR/hr for exposure rate.
Specifications
PART NUMBER: 48-2875
INDICATED USE: Alpha, beta, gamma radiation survey
RANGE: 0-15 mR/hr; 0-50,000 cpm
RADIATION DETECTOR: Pancake G-M
SENSITIVITY: Typically 3300 cpm/mR/hr (137Cs gamma)
ENERGY RESPONSE: Energy dependent
METER FACE: 0 - 0.15 mR/hr; 0 - 500 cpm; BAT OK (see picture below)
MULTIPLIERS: X1, X10, X100
LINEARITY: Reading within plus or minus 10% of true value
AUDIO: Built in unimorph speaker (select quiet position on main switch to silence the audio)
CALIBRATION CONTROLS: Accessible from front of instrument
RESPONSE: Typically 5 seconds from 10% to 90% of final reading
POWER: 1 ea. 9 volt
BATTERY LIFE: Typically 250 hours with alkaline batteries (battery condition can be checked on meter)
METER: 2.5" (6.4 cm) arc, 1 mA analog type
CONSTRUCTION: Aluminum housing with beige polyurethane enamel paint, and a recessed subsurface printed membrane front panel
TEMPERATURE RANGE: -4° F(-20° C) to 122° F(50° C)
May be certified for operation from -40° F(-40° C) to 150° F(65° C)
SIZE: 1.8" (4.6 cm) H X 3.3" (8.4 cm) W X 5.3" (13.5 cm) L
WEIGHT: 0.9 lbs (0.4 kg) including batteries