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Model 177-84

Alpha-Beta Benchtop Counter

Part Number: 48-2727

Features

Simultaneous Alpha & Beta Counting
Independent Alpha & Beta Readouts, Alarm Setpoints & Audible Signatures
Automatic Background Subtraction & Updating
50 Hour Battery Backup

The Model 177-84 is a microprocessor based radiation survey instrument used to measure and discriminate low level alpha and beta radiation when used with an alpha-beta scintillation or proportional detector. The instrument has automatic background subtract and automatic background update. It also has an adjustable count timer which can be set from 0 to 120 seconds. An external switch must be connected to the instrument to initiate a count.

The radiation level is displayed on two analog meters. The Alpha meter dial indicates 0 - 1000 cpm on a three-decade log scale. The Beta meter dial indicates 100 - 100,000 cpm on a three-decade log scale. Each channel has its own distinguishable click per event audio tone. Beta events are a low pitch and alpha events are a high pitch. Beta clicks per event can be set at 1 per 1, 10, 100, or 1000. Each channel has its own alarm point which is adjustable from zero to full scale. Alarms are indicated by an audible tone and LEDs.

Specifications

Compatible Detectors	Gas proportional, Dual phosphor scintillation (such as Model 43-93 and Model 43-68 )
Linearity	± 10% of true value, typically ± 2% of true value when measured with an electronic pulser
Meters	Dual meters (one each for alpha and beta), 1 mA, 2 inch DC movement
Alpha Parameters	Threshold: -1 to -180 mV Meter Scale: 0 - 1000 cpm
Beta Parameters	Threshold: -1 to -4 mV Window: Adjustable 4 to 70 mV Meter Scale: 100 - 100,000 cpm
Cross Talk	≤ 1% alpha counts in beta channel ≤ 10% gross counts in alpha channel
Controls	Front Panel: ACK/Reset button, Meter readout mode (HV, Alarm, Ratemeter) Rear Panel: Power On/Off
Status Indicators	Green LEDs: Updating background, Checking, Check on Red LEDs: Incomplete, Overload, Low battery
Inputs	Count switch signal input via phone jack TINI-JAX #41
Response Time	Beta varies between 1 to 5 s Alpha varies between 5 to 15 s
Count Time	Adjustable between 0 to 120 s in 8 s increments
High Voltage	200 to 2500 Vdc
Power	117 Vac, 60 Hz, and internal rechargable 6 V (sealed-acid) battery, battery life approximately 50 hours
Detector Connectors	Series type “C”
Size (H x W x L)	19.1 x 22.9 x 15.3 cm (7.5 x 9 x 6 in.)
Weight	2.3 kg (4.9 lb.)

Options

Option	Description	Part Number
Low Battery Light Indicator	Adds a low-battery indicator light to instrument.	4347-155
4 - 20 mA Output (Isolated)	Analog output signal.	4347-437
Shelf (or Wall) Bracket	Mounting bracket for the Model 177-Series of instruments.	7173-078-02
Alarm Set Cover	This device may be mounted to the Model 177-Series of benchtop counters to provide protection against unintended modifications to the instrument's alarm setting. It is constructed of aluminum and has two drilled holes for screw-mounting it to the instrument.	7328-021
Wall Station for Model 43-93 Detector	Wall mount bracket for a Model 43-93 alpha-beta detector. Includes a built-in switch to support background update functionality.	4347-500
Wall Station for Model 43-68 Detector	Wall mount bracket for a Model 43-68 alpha-beta detector. Includes a built-in switch to support background update functionality.	4347-501

Description	Part Number
AC Rustrack Cable	8303-387
DC Rustrack Cable	8303-426
Meter Assembly	4173-166
Rechargeable Batteries	21-9385