Ludlum Model 2401 Survey Meter

Pocket Survey Meter Series with Multiple Detector OptionsModel 2401 Radiation Survey Meter

The Ludlum 2401 series pocket size meter features analog display, and a variety of internal detectors. The instrument is lightweight, and rugged. The Model 2401-series pocket survey meters are enclosed in an aluminum housing for added strength, weighing less than a pound. There are four separate models to meet varied applications:

Model 2401 -EC Pocket Survey Meter employs an internal energy compensated G-M detector for gamma radiation with a range of 0-200 mR/hr. Model 2401-EC2 has an internal energy compensated G-M detector with a range of 0-2000 mR/hr. Model 2401 -EW employs an end-window G-M for alpha, beta, and gamma detection. Model 2401-P Pocket Survey meter has a full size pancake G-M (2"dia.) for alpha, beta, and gamma detection.

Check out newer, available models:

Model 2401 -EC Pocket Survey Meter

Indicated Use: Gamma survey
Detector: Energy compensated G-M
Sensitivity: Typically 1050 cpm/mR/hr (CS137 gamma)
Range: 0-200 mR/hr, 0-210,000 cpm
Meter Dial: 0 -2.0 mR/hr, BAT OK, 0-2.1 kcpm
Multipliers: x1, x10, x100

Model 2401 -EC2 Pocket Survey Meter

Indicated Use: High range gamma survey
Detector: Energy compensated G-M
Sensitivity: Typically 120 cpm/mR/hr (CS137 gamma)
Range: 0-2000 mR/hr, 0-2.1 k cpm, BAT OK
Meter Dial: 0 -20 mR/hr BAT OK
Multipliers: x1, x10, x100

Model 2401-EW Pocket Survey Meter

Indicated Use: Alpha, Beta and Gamma survey
Detector: 0.566 inch diameter end window G-M detector
Sensitivity: Typically 1050 cpm/mR/hr (CS137 gamma)
Range: 0 - 200 mR/hr, 0 - 210,000 epm
Meter Dial: 0 - 20 mR/hr; 0 - 2.1 k, BAT OK
Multipliers: x1, x10, x100

Model 2401 -P Survey Meter with Internal Pancake G-M Detector

Indicated Use: Alpha, Beta and Gamma survey
Detector: 2.11 inch diameter pancake G-M detector
Sensitivity: Typically 3300 cpm/mR/hr (CS137 gamma)
Range: 0 - 0.15 mR/hr, 0 - 210,000 cpm
Meter Dial: 0 - 15 mR/hr; 0 - 50,000k cpm, BAT OK
Multipliers: x1, x10, x100

Model 2401 -S Pocket Survey Meter

Detector: 18 mm diameter CsI scintillation crystal
Sensitivity: Typically 120 cpm/microR/hr (Cs-137 gamma)
Meter Dial: 0 - 50 microR/hr; BAT OK
Multipliers: X1, X10, X100
Linearity: Reading within plus or minus 10% of true value


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