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Ludlum Model 2241-3

Radiation Scaler/Ratemeter

Introduction

Ludlum Model 2241-3 Radiation Scaler/Ratemeter ● Digital Radiation Ratemeter with Built-In Scaler

● Auto-Ranging and Adjustable Alarms

● Wide Range High Voltage

● Stores 4 Detector Setups for Detector Swapping

● Supports GM, Proportional and Scintillation Detectors

● Overrange and Overload Protection

The Ludlum Model 2241-3 is a general purpose, digital radiation 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 & 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, plus pushbuttons for activating the LCD backlight, and for either resetting the counts or acknowledging any 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.

Specifications

PART NUMBER: 48-2864

APPLICATION: general purpose radiation survey, gross counting

METER TYPE: digital ratemeter and scaler
COMPATIBLE RADIATION DETECTORS: GM, proportional, scintillation
DETECTOR SETUPS: 4
DISPLAY: 4-digit LCD display with 0.5 in. (1.3 cm) high digits, separate annunciators for display units, alert, alarm, low battery, detector overload, counting overflow, and scaler counting
BACKLIGHT: pushbutton to activate
RATEMETER: can display in R/hr, Sv/h, cpm, or cps when selector switch is in RATE position
CONNECTOR: series "C" type (others available)

DISPLAY RANGE: auto ranging from 0.0 μR/hr–9999 R/hr; 0 cpm–999 kcpm
BACKLIGHT “ON” TIME: 5, 15, 30, 60, 90, 120, 180, or 240 s for backlight to stay “ON” when activated
SCALER: adjustable from 1–9999 seconds (in 1-second intervals)
SCALER COUNT TIME: adjustable from 1–9999 seconds
AUDIO DIVIDE: 1, 10, 100, or 1000 events per click
HIGH VOLTAGE: 400–2500 volts
DISCRIMINATOR: adjustable from 2–100 mV
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 mR/hr
DEAD TIME: adjustable from 0–9999 microseconds
CALIBRATION CONSTANT: adjustable from 0.001-280 X 109 counts/display unit
DETECTOR SWITCH: rotating 5-position switch
DISCRIMINATOR ADJUSTMENTS: 1
RESPONSE:

VARIABLE: Dependent on number of counts present. Typical times are FAST 4 to 25 s, SLOW 4 to 60 s (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 s. The SLOW response is approximately 10 to 250 s. For MDA-type measurements, the fixed response mode is recommended.

ALARMS

ALERT/ALARM: indicated by annunciation on display and audible tone
SCALER ALARM: adjustable from 1–999999 counts

RS-232 DATA DUMP MODE: enables or disables binary dump mode to RS-232 port, when enabled binary 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
TEMPERATURE RANGE: -4 to 122 °F (-20 to 50 °C)
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: 6.5 x 3.5 x 8.5 in. (16.5 x 8.9 x 21.6 cm) (H x W x L)
WEIGHT: 3.5 lb (1.6 kg) including batteries