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Model 177-50

Benchtop Counter

Part Number: 48-1202

Features

5-Range Meter
Logarithmic Analog Scale Readout
Adjustable Alarms
50-Hour Rechargeable Battery
Operates with GM, Proportional & Scintillation Detectors

The Model 177-50 is a rugged benchtop ratemeter with an alarm. This instrument is very popular for frisking operations at stations where line power is available. It can also be used in portable applications for up to 50 hours using the internal rechargeable battery.

The 177-50 supports GM, proportional, and scintillation detectors and displays the results on a linear readout analog meter. The audio alarm is adjustable from 0 through 150% of full scale and is factory set to latching. Reconfiguration to non-latching can be accommodated via a minor internal change.

Front-panel controls include an alarm set control, audio volume adjust, power on/off switch, and pushbuttons for count reset, battery test, high-voltage test, and alarm test. The back panel contains the power cord connection and a 9-pin type "D" plug that supports rapid battery charging, 6 to 9.6 volts power output, alarm output, pulse output, and a recorder output.

Specifications

Indicated Use	Multi-purpose radiation monitoring, frisking
Compatible Detectors	GM, Proportional, Scintillation
Linearity	Within 10% of true value
Meter Dial	10 - 1,000,000 cpm logarithmic, 0 - 2.5 kV, BAT TEST
Meter	6.4 cm (2.5 in.) arc 1 mA analog type
Multipliers	None
Response Time	Dependent on number of counts present, typically not greater than 8 s from 10% to 90% of final reading
Alarm Set	Front-panel locking control allowing alarm to be set at any point on the meter (can be read on meter)
Reset	Pushbutton to zero meter and/or reset alarm
Calibration Controls	Accessible from back of instrument (protective cover provided)
Alarm	Indicated by red lamp and full volume audible tone (greater than 60 dB at 61 cm [2 ft])
High Voltage	Adjustable from 400 to 2500 V
Threshold	Adjustable from -2 to -100 mV
Audio	Built-in unimorph speaker with volume control to provide click-per-event audio or audible alarm indicator
Data Out	9-pin series "D" connector allowing for external connections of the following items: Battery Unregulated supply Instrument common ground Alarm signal (current sink) Pulse out External background subtract Recorder output
Recorder Output	Correlated to meter reading (adjustable to 1 V at 1 mA)
Power	95 to 135 Vac (178 to 240 Vac available), 50 to 60 Hz, 6 V sealed lead-acid rechargeable battery (built-in)
Battery Life	Typically 50 hours in non-alarm condition (battery condition can be checked on meter)
Battery Charger	Battery is continuously trickle-charged when instrument is connected to line power and turned on (optional external fast charger available)
Size (H x W x L)	12.7 x 20.3 x 15.2 cm (5 x 8 x 6 in.)
Weight	1.9 kg (4.2 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

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