Model 2224-1

Alpha-Beta Scaler-Ratemeter

Part Number: 48-2679

Features

• Alpha-Beta Scaler-Ratemeter
• Analog Display with Digital Scaler Readout
• Alpha-Beta Audio Discrimination

The Model 2224-1 is an optimized Alpha-Beta Scaler-Ratemeter that offers traditional analog readout, supplemented with a digital LCD for the scaler function. Simultaneous, separate counting of alpha and beta is featured on this instrument. 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 one of four decades, battery test, or instrument shut-off; separate pushbuttons for testing the high voltage and resetting the counts; an audio volume adjustment knob; and 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 promotes long-lasting protection and instrument life. A dipswitch control housed internally allows setting the scaler count time, audio divide-by value, and audible tone discrimination settings.

• Specifications
• Options
• Documents
• Replacement Parts

• Specifications
• Options
• Documents
• Replacement Parts

Specifications

Indicated Use	Simultaneous alpha and beta counting and discrimination
Compatible Detectors	Proportional and dual phosphor scintillation
Linearity	Reading within 10% of true value with detector connected
Meter Dial	0 - 500 cpm, 0 - 2 kV, BAT OK, OL (overload)
Meter	6.4 cm (2.5 in.) arc, 1 mA analog type
Scaler	6-digit LCD display with 0.64 cm (0.25 in.) digits, overflow arrow, and colons to indicate when a count is in process
Multipliers	x1, x10, x100, x1000
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
Response	Will vary according to number of counts present, typically 2 to 11 s from 10% to 90% of final reading
High Voltage	Adjustable from 400 to 2000 V (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)
Audio	Built-in unimorph speaker with volume control (greater than 60 dB at 61 cm [24 in.], 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)
Temperature Range	-20 to 50 °C (-4 to 122 °F) May be certified for operation from -40 to 65 °C (-40 to 150 °F)
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)
Connector	Series “C” (others available)
Size (H x W x L)	16.5 x 8.9 x 21.6 cm (6.5 x 3.5 x 8.5 in.)
Weight	1.6 kg (3.5 lb), including batteries

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Options

Option	Description	Part Number
Lighted Handle	Handle with LED to illuminate the instrument display.	4464-154
Headphone Jack	Adds headphone jack to instrument.	4464-464
Stereo/Mono Headphones	Adjustable stereo/mono headphones.	22-9313
Stick-On Check Source Holder	Adhesive check source holder that attaches to instrument housing.	4464-473

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Documents

• Data Sheet
• Product Manual - English
• Product Manual - Arabic
• Product Manual - French
• Product Manual - Russian
• Product Manual - Spanish
• CE Certificate

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Replacement Parts

Description	Part Number
Handle	4408-075

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