INDICATED USE: Area monitoring
COMPATIBLE DETECTORS: G-M, proportional, scintillation, and neutron
DISPLAY: 4 digit LED display with 0.8"(2cm) character height
DISPLAY RANGE: 000.0 - 9999
DISPLAY UNITS: Can be made to display in microR/hr, mR/hr, R/hr, microSv/h, mSv/h, Sv/h, microrem/hr, mrem/hr, rem/hr, cpm, cps, and others
LINEARITY: Reading within plus or minus 10% of true value with detector connected
RESPONSE: Typically 3 seconds from 10% to 90% of final reading
STATUS: (green light) Indicates the instrument is functoning properly
LOW ALARM: Indicated by a yellow light and slow beep (1 per second) audible tone (can be set at any point from 0.0 - 9999)
HIGH ALARM: Indicated by a red light and fast beep (4 per second) audible tone (can be set at any point from 0.0 - 9999)
NOTE:Audible indicators can be configured as a single beep if desired.
DET FAIL: (red light and audible tone; greater than 68 Db at 2 feet) Indicates detector overload, no count from detector, or instrument failure
LOW BAT: (yellow) Indicates less than 2 hours of battery power remaining
CONNECTOR: Series "C" (others available )
CALIBRATION CONTROLS: Accessible from front of instrument (protective cover provided )
HIGH VOLTAGE: Adjustable from 200 - 2500 volts
THRESHOLD: Adjustable from 2 - 100 mV
DEAD TIME: Adjustable to compensate for dead time of the detector and electronics (can be read on the display)
OVERLOAD: Senses detector saturation (indicated by display reading"-OL-")
OVERRANGE: Indicates the radiation field being measured has exceeded the
counting range of the instrument (indicated by display reading "----")
DATA OUTPUT: 9 pin connector providing 5 decade log output, RS-232 output, signal ground connection, FAIL and Alarm signals (current sink), and direct connection to battery and ground
REMOTE(optional): Model 271, or Model 272 remote units
POWER: 95 - 135 VAC (178 - 240 VAC available), 50 - 60 Hz single phase (less than 100 mA), 6 volt sealed lead acid rechargable battery (built in)
BATTERY LIFE: Typically 48 hours in non-alarm condition, 12 hours in alarm condition
BATTERY CHARGER: Battery is continuously trickle charged when instrument is
connected to line power and turned on
CONSTRUCTION: Aluminum housing with ivory polyurethane enamel paint
TEMPERATURE RANGE: -4 degrees F(-20 degrees C) to 122 degrees F(50 degrees C)
May be certified for operation from -40 degrees F(-40 degrees C) to 150 degrees F(65 degrees C)
SIZE: 7.4" (18.7 cm)H X 9.7" (24.6 cm)W X 2.5" (6.4 cm)L
WEIGHT: 6.5 lbs (2.3 kg)

Ludlum Model 375 Area Monitor Variations available:

 Model 375 Area Monitor without Detector

 Model 375/2 Digital Monitor w/ internal GM (0.1 mR/hr - 1.0 R/hr)

 Model 375/4 Digital Monitor w/ internal GM (1.0 mR/hr - 4.0 R/hr)


MODEL 271 - Remote Display
MODEL 272 - Remote Display with Analog Meter

MODEL 375/2 - Area Monitor
MODEL 375/4 - Area Monitor
MODEL 375 DUAL - Area Monitor

MODEL 133 SERIES - G-M Detectors
MODEL 44-2 - Gamma Scintillator
MODEL 42-30 - Neutron Detector


Remote Displays
Time Date Stamp

For Gamma Monitoring

For Neutron Monitoring

Model 133 Series
Model 44-2
Model 44-3
Model 44-6
Model 44-10
Model 44-38
Model 44-62

Model 42-30



Nuclear Instrumentation

Dosimetry Shielding Sources Specials

Hepa Vacuums

Chemical Detection

Marinelli Beakers

Fume Hoods


Emergency Response

Nuclear Medicine

Radiation Therapy Search Home

Direct Scientific  /  tel (310) 589 0601 /   Email

contact us: en espaņol, auf Deutsch
Open 8:00 AM - 5:00 PM Pacific Standard Time