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 Ludlum Model
177
Radiation Alarm Ratemeter
 Features
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4 Decade
Range
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Linear
Analog Scale Readout
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Adjustable Alarms
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50 Hour
Rechargeable Battery
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Supports
GM and Scintillation Type Radiation Detectors
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Total Counting Range from 0 - 500,000 cpm
Introduction
The Ludlum
Model 177 is a rugged benchtop radiation ratemeter with alarming capability.
These units are very popular for frisking operations at stations where line
power is available but can also be used in portable applications for up to 50
hours using the internal rechargeable battery. The 177 supports G-M and
scintillation type radiation 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 a 4
position rotary switch for selecting each detector decade, alarm set control,
audio volume adjust, fast/slow response switch, power on/off switch and push
buttons 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 - 9.6 volts power output, alarm output,
pulse output and a recorder output.
Specifications
PART NUMBER:
48-1632
INDICATED USE: Multi-purpose radiation
monitoring; frisking
COMPATIBLE RADIATION DETECTORS: G-M, scintillation
METER FACE: 0 - 500 cpm, 0 - 1.5 kV, BAT TEST (see picture
below)
MULTIPLIERS: X1, X10, X100, X1k
LINEARITY: Reading within plus or minus 10% of true value with detector
connected
CONNECTOR: Series "C"
(others available)
AUDIO: Built in unimorph speaker with volume control (greater than 60
dB at 2 feet full volume)
ALARM: Indicated by a red lamp and full volume audible tone
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; and
recorder output.
RECORDER OUTPUT: Correlated to meter reading (adjustable to 1 volt at
1 mA)
CALIBRATION CONTROLS: Accessible from back of instrument (protective
cover provided)
HIGH VOLTAGE: Adjustable from 200 - 1500 volts (can be read on meter)
THRESHOLD: Adjustable from 10 - 100 mV
RESPONSE: Toggle switch for FAST (4 seconds) or SLOW (22 seconds) from
10% to 90% of final reading
RESET: Push-button to zero meter
POWER: 95 - 135 VAC (178 - 240 VAC available), 50 - 60 Hz single
phase (less than 100 mA), 6 volt sealed lead acid rechargeable battery (built
in)
BATTERY LIFE: Typically 50 hours (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 is
available)
METER: 2.5" (6.4 cm) arc, 1 mA analog type
CONSTRUCTION: Cast and drawn aluminum with beige polyurethane enamel
paint
TEMPERATURE RANGE: -4° F(-20° C) to 122° F(50° C)
May be certified for operation from -40° F(-40° C) to 150° F(65° C)
SIZE: 5" (12.7 cm) H X 8" (20.3 cm) W X 6" (15.2 cm) L
WEIGHT: 4.2 lbs (1.9 kg)
 This Product is CE Certified
Compatible Radiation Detectors
Compatible radiation detectors are listed below and are
not included with the survey meter price. An additional charge will be added for
each detector ordered.
*For Mylar window scintillators it is strongly
suggested that the optional
overload indicator be used on the Model
177 Radiation Alarm Ratemeter to better determine the presence of a light leak.
Meter Face
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202-096
0 - 500 cpm; 0 - 1.5 kV |
Options
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Check Source
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Overload Indicator
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Low Battery Light Indicator Option - Model L-4347-155
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4-20 mA Output (Non-Isolated) - Model L-5173-351
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4-20 mA Outout (Isolated) - Model L-5347-079
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Shelf (or Wall) Bracket - Model L-7173-078-02
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Alarm Set Cover - Model L-7328-021
Replacement Parts
Technical Information
Other Ludlum Products
Ludlum Information
For more information or to request a quotation,
please contact us
by phone at: (865)
947-5123 or by email at:
sales@deqtech.com.
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Copyright 2005-2011 © DEQ Technical Sales, LLC