Ludlum Model 2241

Digital scaler/ratemeter

Portable readout and counting electronics for external GM, proportional and scintillation detectors.

Weight including batteries: 1.6 kg1

Download product sheet (PDF)All values with references – for tender documents

Specifications checked against the manufacturer’s documents on 2026-10-16

Manufacturer’s product page (opens in a new tab)

Overview

Nuclear power & nuclear technology Research & laboratories Environmental monitoring & radiation protection

Key features

Ratemeter and scaler modes with adjustable alarms.
RS-232 for computer connection and configuration.
Detector selected separately for the application.

Specifications

The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.

Detector

Compatible detectors	GM, proportional and scintillation detectors1

Electronics & signal

Detector high voltage	400–2400 V1
Discriminator	2–100 mV1

Connectivity & interface

Communication	RS-2321
Display	4-digit LCD with backlight1

Power & battery

Typical battery life	200 h, alkaline batteries1
Power supply	2 D-cell batteries1

Mechanical

Dimensions (H × W × L)	16.5 × 8.9 × 21.6 cm1

Environment & ratings

Operating temperature	−20–+50 °C2

Ordering & accessories

Part number	48-24441
Weight including batteries	1.6 kg1

General

Scaler counting time	1–9999 s in 1 s steps1

The data comes from the manufacturer’s published documents. Manufacturers may change specifications; the current configuration and performance are confirmed in the quotation.

Documents

PDFModel 2241 General Purpose Ratemeter / ScalerDatasheet · Ludlum

Sources

The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.

1
Model 2241 General Purpose Ratemeter / Scaler
Publisher: Ludlum MeasurementsDatasheet p. 1, Specifications; p. 1, Specifications (SCALER); p. 1, Specifications (HIGH VOLTAGE); p. 1, Introduction / Specifications (RS-232) … Checked 2026-10-16
2
Model 2241 Digital Scaler-Ratemeter
Publisher: Ludlum MeasurementsProduct page Specifications Checked 2026-10-16