Ludlum Model 2241-3i Digital Scaler / Ratemeter

INDICATED USE: General purpose survey, gross counting
COMPATIBLE DETECTORS: G-M, proportional, scintillation
CONTROL SWITCH: A 5 position rotating switch to allow for quick change among 3 external detectors or the internal G-M.
INTERNAL DETECTOR: Energy compensated G-M
INTERNAL DETECTOR LINEAR RANGE: 1mR/hr to 10 R/hr
ALERT/ALARM: Indicated by annunciator on display and audible tone
DISPLAY: 4 digit LCD display with 0.5"(1.3cm) high digits, separate annunciators for display units, alert, alarm, low battery, detector overload, counting overflow, and scaler counting
BACKLIGHT: Push-button to activate
RATEMETER: Can display in R/hr, Sv/hr, cpm, or cps when control switch is in RATEMETER position
DISPLAY RANGE: Auto ranging from 0.0 犀/hr - 9999 R/hr; 0.000 猶v/hr - 9999 Sv/hr; 0.00 cpm - 999k cpm; or 0.00 cps - 100k cps
SCALER: Activated by push-button in handle (count time adjustable from 1 - 9999 seconds in 1 second intervals)
HIGH VOLTAGE: Four independent controls; each adjustable from 200 - 2500 volts
DISCRIMINATOR: Adjustable from 2 - 100 mV
OVERLOAD: Indicated by OVERLOAD on display (adjustable depending on detector selected)
BATTERY LIFE: Typically 200 hours with alkaline batteries (24 hours when low battery is first indicated on display)
SIZE: 6.5"(16.5cm)H X 3.5"(8.9cm)W X 8.5"(21.6cm)L
WEIGHT: 3.5 lbs (1.6kg) including batteries

The following parameters are adjusted for each detector by removable switchboard. Once initial setup and calibration have been completed the switchboard can be removed without affecting normal operation of the instrument (Model 2241-3i may be ordered without switchboard)

BACKLIGHT "ON" TIME: 5, 30, 60, 90, 180, or 240 seconds for the backlight to stay "ON" when activated.
SET MINIMUM DISPLAY: Allows lower limit of auto-ranging display to be fixed. For example, display can be set to not show values less than 1 R/hr.
RS-232 DATA DUMP MODE: Enables or disables dump mode to RS-232 port. When enabled data will be dumped every 2 seconds
RS-232 DETECTOR SETUP MODE: Allows for detector parameters to be input by RS- 232 port
BAUD RATE: 150, 300, 600, 1200, 2400, 4800, 9600, or 19200 bps.
DEAD TIME: Adjustable from 0 - 9999 seconds
CALIBRATION CONSTANT: Adjustable from 0.001 - 280 X 109 counts/display unit
DISPLAY UNITS: Can read in R/hr, Sv/hr, cpm, or cps
TIME BASE: Can read in seconds or minutes
AUDIO DIVIDE: 1, 10, 100, or 1000 events-per-click
RESPONSE:
     FIXED: FAST response time adjustable from approximately 2 - 50 seconds. SLOW response is 5 times
          fast setting
     VARIABLE: Dependent on number of counts present. Typical times FAST - 4 - 25 seconds,
          SLOW - 4-60 seconds
(All times stated from 10% to 90% of final reading)
RATEMETER ALERT/ALARM: Set at any point corresponding to pre-selected ratemeter range
SCALER ALARM: Adjustable from 1 - 999999 counts
SCALER COUNT TIME: Adjustable from 1 - 9999 seconds

For Alpha Measurements	For Beta Measurements	For Gamma Measurements	For Alpha/beta/gamma Measurements
Model 43-1 Model 43-2 Model 43-5 Model 43-20 Model 43-44 Model 43-44-1 Model 43-65 Model 43-68 Model 43-90 Model 44-7 Model 44-9 Model 44-88 Model 44-89 Model 44-94	Model 43-20 Model 43-68 Model 44-1 Model 44-6 Model 44-7 Model 44-9 Model 44-21 Model 44-38 Model 44-88 Model 44-89 Model 44-92 Model 44-94 Model 44-98 Model 44-116	Model 44-2 Model 44-3 Model 44-6 Model 44-7 Model 44-9 Model 44-10 Model 44-17 Model 44-20 Model 44-21 Model 44-38 Model 44-62	Model 44-7 Model 44-9 Model 44-88 Model 44-89 Model 44-94

Accessories	Replacement Parts
Check Source Source Holder Headset Shoulder Strap Standard Carrying Case Air and Water Tight Carrying Case	Cable Meter Bezel LCD Display Handle Probe Clip