Ludlum 194/SE

Handheld survey meter

Ludlum 194/SE – handheld survey meter from Ludlum Measurements. Detector: Rugged plastic scintillator, EJ-256. Enclosure rating and conditions: IP65.

Detector: Rugged plastic scintillator, EJ-2561
Enclosure rating and conditions: IP651
Weight as specified: 1.1 kg including 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

Detector	Rugged plastic scintillator, EJ-2561

Measuring range

Low range	Background to 19.99 µSv/h (1999 µrem/hr)1
High range	1 to 1999 µSv/h (0.1 to 199.9 mrem/hr)1
Detector arrangement	Extended detector (protrudes from the case) with low-energy 3.2 mg/cm² window for operation below 50 keV1

Power & battery

Power supply	Two "AA" cell batteries1
Battery life and conditions	Approximately 200 hours without backlight or audio; green BAT OK light indicates adequate battery power1

Mechanical

Dimensions (H × W × L)	19.0 x 8.9 x 21.6 cm1
Weight as specified	1.1 kg including batteries1

Environment & ratings

Operating temperature	-10 to 50 °C1
Enclosure rating and conditions	IP651

Ordering & accessories

Part number	48-4388-11

General

Readout unit	µSv/hr1

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 194 Dose Equivalent Rate Meter
Publisher: Ludlum MeasurementsProduct page Specifications tab, 'Detector' (shared table for all 194 configurations); Specifications tab, 'Low Range'; Specifications tab, 'High Range'; Specifications tab, 'Power' … Checked 2026-10-16