Environmental Restoration Group

Ludlum Model 2224
Ludlum Product Description
When you need to separately count alpha and beta concurrently, this is the right instrument for the job. The Model 2224-1 is an optimized Alpha Beta Ratemeter/Scaler that offers traditional analog readout supplemented with a digital LCD for the scaler function. A front panel mounted three way switch facilitates selecting alpha only, beta only or alpha plus beta. Other controls include a rotary switch for selecting any of 4 decades, battery test and instrument shut off, separate pushbuttons for testing the high voltage and resetting the counts, an audio volume adjustment knob and finally a scaler count start button located on the instrument handle. The instrument housing is cast aluminum incorporating a separate battery compartment and an accompanying metal handle that promote long lasting protection and instrument life. A dipswitch control housed internal to the instrument allows setting the scaler count time, audio divide by value and audible tone discrimination settings.


INDICATED USE: Simultaneous alpha, beta counting and discrimination sugested DETECTORS: Proportional and dual phosphor scintillation detectors
CONNECTOR: Series C (others available)
AUDIO: Built in unimorph speaker with volume control (greater than 60 dB at 2 feet, full volume). Selectable dual or individual click-per-event for alpha and beta counts and divisions of 1, 10, 100, or 1000 events-per-click (beta counts only)
METER: 2.5(6.4 cm) arc, 1 mA analog type
METER DIAL: 0 - 500 cpm, 0 - 2 kV, BAT OK, OL (overload)
MULTIPLIERS: X1, X10, X100, X1000
LINEARITY: Reading within 10% of true value with detector connected
SCALER: 6 digit LCD display with 0.25(0.64 cm) digits, overflow arrow, and colons to indicate when a count is in process
COUNT: Pushbutton to initiate scaler count
COUNT TIME: Externally selectable times of 0.1, 0.5, 1, or 2 min.
SELECTOR SWITCH: Toggle switch to select alpha and beta, alpha only, or beta only
HIGH VOLTAGE: Adjustable from 200 - 2000 volts (can be read on meter)
HIGH VOLTAGE ADJUST: Accessible from front of instrument (protective cover provided)
OVERLOAD: Senses detector saturation. Indicated by red lamp on meter and meter going to full scale (adjustable depending on detector selected)
RESPONSE: Will vary according to number of counts present. Typically 2 - 11 seconds from 10% to 90% of final reading
POWER: 2 each D cell batteries (housed in sealed compartment that is externally accessible)
BATTERY LIFE: Greater than 350 hours with alkaline batteries (battery condition can be checked on meter)
TEMPERATURE RANGE: -4 F to 122 F (-20 C to 50 C) May be certified for operation from -40 F to 150 F (-40 C to 65 C)
SIZE: 4.2 H x 3.5 W x 8.5 L (10.7 x 8.9 x 21.6 cm)
WEIGHT: 3.5 lbs (1.6 kg) including batteries
8809 Washington St. NE Suite 150
Albuquerque, NM 87113
Tel: (505) 298-4224
Fax: (505) 797-1404