ludlum 2241-2 RK Rental

Rent Ludlum 2241-2 RK Kit Digital Ratemeter

The 2241-2RK Emergency Kit packages all the basic radiation measurement tools you're likely to need to handle a radiological emergency into a convenient carrying case to facilitate a quick response when required. It is also a versatile tool for general radiological surveys. The kit includes Ludlum's digital, auto-ranging, and versatile Model 2241-2 Ratemeter/Scaler that can measure exposure, contamination, and samples. Responders can either plug in the alpha beta gamma GM pancake probe (Model 44-9) for contamination measurements and measuring samples or the (Model 44-2) high-sensitivity gamma scintillator for locating the source of the high readings. A locked toggle switch selects the correct set of operating parameters for detector presently connected to the instrument to optimize the measurement. The carrying case supplied with the kit is air and water tight with cutouts for each device including a 137Cs check source to verify proper operation of the equipment.

  • Ready-to-Go Kit for General Survey or Emergency Response
  • Measures Alpha Beta Gamma Contamination
  • Measures Exposure Rate
  • Includes a High-Sensitivity Gamma Probe for Quickly Finding Sources
  • Auto-Ranging Digital Ratemeter/Scaler


DET1/DET2: a locking toggle switch to allow for quick change between two detector setups
ALERT/ALARM: indicated on display and by audible tone
DISPLAY: 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. Two additional 0.5 cm (0.2 in.) digits are used for the overflow counter (scaler mode) and exponential powers (parameter setup).
BACKLIGHT: pushbutton to activate
RATEMETER: can display in R/hr, Sv/h, cpm, or cps when control switch is in RATEMETER position
DISPLAY RANGE: auto ranging from 0.0 μR/hr-9999 R/hr; 0.000 μSv/h-9999 Sv/h; 0 cpm-999 kcpm; or 0 cps-100 kcps
SCALER: activated by pushbutton in handle (count time adjustable from 1-9999 seconds in 1-second intervals)
OVERLOAD: indicated by OVERLOAD on display (adjustable depending on detector selected)
BATTERY LIFE: typically 200 hours with alkaline batteries (low battery indicated on display)
TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F)
BACKLIGHT “ON” TIME: 5, 15, 30, 60, 90, 120, 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 μR/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 microseconds
CALIBRATION CONSTANT: adjustable from 0.001-280 X 109 counts/display unit
DISPLAY UNITS: can read in R/hr, Sv/h, cpm, or cps
TIME BASE: can read in seconds or minutes
AUDIO DIVIDE: 1, 10, 100, or 1000 events per click
Dependent on number of counts present. Typical times are FAST 4 to 25 seconds, SLOW 4 to 60 seconds (All times stated from 10% to 90% of final reading).
FIXED: The parameter is adjustable from 10 to 25 resulting in a FAST response from approximately 2 to 50 seconds. The SLOW response is approximately 10 to 250 seconds. For MDA-type measurements, the fixed response mode is recommended.
RATEMETER ALERT/ALARM: set at any point corresponding to pre-selected ratemeter rang
SCALER ALARM: adjustable from 1-999999 counts
SCALER COUNT TIME: adjustable from 1-9999 seconds
OVERALL SIZE: 43.2 x 29.7 x 15.7 cm (17 x 11.7 x 6.2 in.) (H x W x D)
CASE WEIGHT: 3.08 kg (6.8 lb) empty, 5.9 kg (13 lb) with instruments

Product Manual (PDF)
Specifications (PDF)