Ludlum 2241-3i

Handheld survey meter

Ludlum 2241-3i – handheld survey meter from Ludlum Measurements.

Compatible external detectors: GM, proportional, scintillation1
Internal detector: Energy-compensated GM tube, range up to 10 R/hr1
Detector bias: 400 to 2400 V1
Power supply: 2 "D" cell batteries1

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 Defence, security & preparedness Emergency services & first response Environmental monitoring & radiation protection Industry & quality control

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 external detectors	GM, proportional, scintillation1
Internal detector	Energy-compensated GM tube, range up to 10 R/hr1

Electronics & signal

Detector bias	400 to 2400 V1

Connectivity & interface

Display range	Auto-ranging: 0.0 µR/hr–9999 R/hr; 0.000 µSv/h–9999 Sv/h; 0 cpm–999 kcpm; 0 cps–100 kcps1

Power & battery

Power supply	2 "D" cell batteries1
Battery life and conditions	Typically 200 hours with alkaline batteries1

Mechanical

Dimensions (H × W × L)	16.5 x 8.9 x 21.6 cm1
Weight	1.6 kg including batteries1

Environment & ratings

Operating temperature	-20 to 50 °C1

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

Documents

PDFDatablad (PDF)Datasheet · 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 2241-3i Digital Scaler-Ratemeter with Internal Detector
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Compatible External Detectors'; Specifications tab, 'Internal Detector'; Specifications tab, 'High Voltage'; Specifications tab, 'Power' … Checked 2026-10-16