Model 3 Survey Meter

Ludlum Measurements

The Ludlum Model 3 Survey Meter is the industry standard of radiation survey meters.  The meter has a rugged design and microprocessor electronics. With proper care, the Ludlum Model 3 will last decades. It operates on two "D" cells for approximately 2000 hours. The Ludlum Model 3 has adjustable high voltage to 1500 volts and includes external calibration controls. The four counting ranges are x0.1, x1, x10, x100. (Dual scale, mR/hr & cpm available on special request.) Typical Counting Range is from 0 - 200 mR/hr, or 0 - 500,000 cpm. The Ludlum Model 3 is supplied as shown with built-in speaker, strain relief cable, probe clip-on handle, two "D" cell batteries and standard factory calibration. Model 44-3 or 44-2 gamma scintillator probes and many others can also be used with this meter.

Newer Digital Versions of this type of survey meter are available with auto-ranging, multiple units and scaler function.

Digital models are also available.

Waterproof Pelican Cases Available

Ludlum Measurements Model 3 Survey Meter

Ludlum Model 3 Survey Meter with Pancake probeLudlum Model 3 Survey Meter CE Mark

Ludlum Model 3 Survey Meter

Ludlum Model 3 Survey Meter with 44-9 Pancake Probe

INDICATED USE: General purpose survey
COMPATIBLE DETECTORS: G-M, scintillation
METER DIAL: 0 - 2 mR/hr, or 0 - 5k cpm, BAT TEST (others available)
MULTIPLIERS: X0.1, X1, X10,X100
LINEARITY: Reading within ±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 - 1500 volts
THRESHOLD: 30 mV ± 10 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 greater than 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 polyurethane enamel paint
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

 

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Ludlum Model 3 Common Meter Dials

 202-002
0 - 5k cpm
For Any Detector

 202-608
0-6.6k cpm; 0-2 mR/hr
For Model 44-9; 44-9-18;
44-40; 44-88; 44-89; 44-94

 202-664
0-6.6k cpm; 0-20
mSv/h
For Model 44-9; 44-9-18;
44-40; 44-88; 44-89; 44-94


 

 

 

 202-627
0-2 mR/hr

For Model 44-9; 44-9-18;
44-40; 44-88; 44-89; 44-94

202-889
0-20 mSv/h

For Model 44-9; 44-9-18;
44-40; 44-88; 44-89; 44-94
 

202-330
0-4k cpm; 0-2 mR/hr
For Model 44-7
 


 202-676
0-4k cpm; 0-20
mSv/h
For Model 44-7

 202-085
0-2 mR/hr
For Model 44-7

 202-393
0-20
mSv/h
For Model 44-7


 

 

202-084
0-2 mR/hr
For Model 44-6; 44-38

202-379
0-20
mSv/h
For Model 44-6; 44-38

202-241
0-2 mR/hr; 0-2.4k cpm
For Model 44-6; 44-38


202-546
0-20
mSv/h; 0-2.4k cpm
For Model 44-6; 44-38

202-654
0-50
mR/hr; 0 - 8.5k cpm
For Model 44-2

202-666
0-50
mR/hr
For Model 44-2


 

 

202-740
0-0.5
mSv/h
For Model 44-2

202-212
0-5
mR/hr; 0-3500 cpm
For Model 44-3(I-125)

202-570
0-50
mSv/h; 0-3.5k cpm
For Model 44-3(I-125)


   

202-717
0-5
mR/hr
For Model 44-10

COMMONLY USED DETECTOR PROBES for the Ludlum Model 3:

For
Alpha
Detection

For
Beta
Detection

For
Gamma
Detection

For Alpha/beta/gamma Detection

Model 44-7
Model 44-9
Model 44-88
Model 44-89
Model 44-94
Model 43-1
Model 43-2*
Model 43-5*
Model 43-65*
Model 43-90*
Model 44-94

Model 44-6
Model 44-7
Model 44-9
Model 44-38
Model 44-88
Model 44-89
Model 44-94
Model 44-1*
Model 44-21
Model 44-116*

 

Model 44-2
Model 44-3
Model 44-6
Model 44-7
Model 44-9
Model 44-38
Model 44-10
Model 44-17
Model 44-20
Model 44-21
Model 133-2
Model 133-4
Model 133-6
Model 133-7
Model 133-8
 

Model 44-7
Model 44-9
Model 44-88
Model 44-89
Model 44-94

*For Mylar window scintillators it is strongly suggested that the optional overload indicator be used on the Model 3 Survey Meter to better determine the presence of a light leak.

AVAILABLE ACCESSORIES
Cables , Meter Dials, Check Source And Holder, Carrying Case, Overload Indicator, Scaler Option, Shoulder Strap

Ludlum Model 3 Manual

 

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