LUDLUM 2241-3

This instrument is a general purpose, digital ratemeter with a built-in scaler that provides timed
counts over a user specified period. This system will store detector setup information for up to four
detectors and offers a front-panel mounted rotary switch so personnel can quickly swap detectors in
the field.
The LCD presents readings in a four-digit, moving decimal format together with one of a wide range
of available units of measure and is accompanied by several operational and alert icons. The LCD
backlight can be activated and remains lit for a user-adjustable interval.
This instrument features adjustable alert and alarm setpoints for both the Ratemeter and Scaler
modes. Front-panel controls include a rotary switch for selecting between Off, and up to four
detector setups; separate switches for selecting Ratemeter Mode and Scaler Mode, audio on/off,
and fast/slow response time; and push-buttons for activating the LCD backlight and for either
resetting the counts or acknowledging alarms.
Calibration, user configured alarms, scaler count intervals and detector setups can be configured via
an internally housed switchboard or through an RS-232 serial interface to a PC.

Indicated Use General purpose survey, gross counting
Detectors GM, Proportional, Scintillation
Detector Setups 4
4-digit LCD display with 1.3 cm (0.5 in.) high digits, separate annunciators for
display units, alert, alarm, low battery, detector overload, counting overflow, and
scaler counting
Display Range
Auto ranging from:
 0.0 μR/hr to 9999 R/hr
 0.000 μSv/h to 9999 Sv/h
 0 cpm to 999 kcpm
 0 cps to 100 kcps
Backlight Pushbutton to activate
Ratemeter Can display in R/hr, Sv/h, cpm, or cps when selector switch is in RATE position
Scaler Adjustable from 1 to 9999 s (in 1 s intervals)
Detector Switch Rotating 5-position switch
Alert/Alarm Indicated by annunciation on display and audible tone
High Voltage 400 to 2500 V
Discriminator Adjustable from 2 to 100 mV
Adjustments 1
Temperature Range -20 to 50 ºC (-4 to 122 ºF)
RS-232 Port Available in two output formats: binary output or ASCII output. The ASCII output
format option requires a firmware change (PN 4408-192).
Power 2 “D” cell batteries housed in an externally accessible, sealed compartment
Battery Life Typically 200 hours with alkaline batteries (low battery warning on LCD)
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.

14 + 14 =

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