Ludlum Model 12 Ratemeter

Ludlum Model 12 Ratemeter

4 Ranges
Adjustable High Voltage
Adjustable Threshold
Utilizes G-M, Scintillation, or Proportional Detectors
Built In Audio with ON/OFF Switch
Total Range from 0 - 500,000 cpm
Splash Proof

Ludlum Model 12, #48-1609

Model 12 Ratemeter Compatible Detectors: G-M, proportional, scintillation
METER DIAL: 0 - 500 cpm, 0 - 2.5 kV, BAT TEST (others available )
MULTIPLIERS: X1, X10, X100, X1000
LINEARITY: Reading within plus or minus 10% of true value with detector connected
CONNECTOR: Series "C" (others available )
AUDIO: Built in unimorph speaker with ON/OFF switch (greater than 60 dB at 2 feet )
CALIBRATION CONTROLS: Accessible from front of instrument (protective cover provided )
HIGH VOLTAGE: Adjustable from 200 - 2500 volts (can be read on meter )
DISCRIMINATOR: Adjustable from 1 - 100 mV
RESPONSE: Toggle switch for FAST (4 seconds) or SLOW (22 seconds) from 10% to 90% of final reading
RESET: Push-button to zero meter
POWER: 2 each "D" cell batteries (housed in sealed compartment that is externally accessible )
BATTERY LIFE: Typically 2000 hours with alkaline batteries (battery condition can be checked on meter )
METER: 2.5" (6.4 cm) arc, 1 mA analog type
CONSTRUCTION: Cast and drawn aluminum with beige powdercoat
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: 6.5" (16.5 cm)H X 3.5" (8.9 cm)W X 8.5" (21.6 cm)L
WEIGHT: 3.5 lbs (1.6 kg) including batteries

Ludlum Model 12 Manual

*For Mylar window scintillators it is strongly suggested that the optional overload indicator be used on the Model 12 Ratemeter to better determine the presence of a light leak.

Ludlum Model 12 Common Meter Dials


202-356 0 - 500 cpm; 0-2.5 kV For Any Detector	202-354 0-10 cps; 0-2.5 kV For Any Detector	202-618 0-660 cpm; 0-0.2 mR/hr For Model 44-9; 44-9-18; 44-40; 44-88; 44-89; 44-94


202-428 0-5 mR/hr For Model 44-2	202-645 0-5 mR/hr; 0-800 cpm For Model 44-2 and 44-9

Accessories	Replacement Parts
Check Source Source Holder Overload Indicator Scaler Option Shoulder Strap Headset Standard Carrying Case Air and Water Tight Carrying Case	Cables Meter Bezel Meter Movement Handle Probe Clip

For Alpha Measurements	For Beta Measurements	For Gamma Measurements	For Alpha/beta/gamma Measurements
Model 43-1* Model 43-2* Model 43-5* Model 43-20 Model 43-44 Model 43-44-1 Model 43-65* Model 43-68 Model 43-90* Model 44-7 Model 44-9 Model 44-88 Model 44-89 Model 44-94	Model 43-20 Model 43-68 Model 44-1* Model 44-6 Model 44-7 Model 44-9 Model 44-21 Model 44-38 Model 44-88 Model 44-89 Model 44-92 Model 44-94 Model 44-98* Model 44-116*	Model 44-2 Model 44-3 Model 44-6 Model 44-7 Model 44-9 Model 44-10 Model 44-17 Model 44-20 Model 44-21 Model 44-38 Model 44-62	Model 44-7 Model 44-9 Model 44-88 Model 44-89 Model 44-94

Suggested detectors are listed below and are not included with the survey meter price. An additional charge will be added for each detector ordered.

*For Mylar window scintillators it is strongly suggested that the optional overload indicator be used on the Model 12 Ratemeter to better determine the presence of a light leak.

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