Ludlum Model 3003

SCA and detector readout

Readout instrument for external radiation detectors with a single-channel analyzer and timed counting. Base model 3003 has no internal detector.

Weight excluding detectors and clips: 0.9 kg1
Enclosure rating and conditions: IP531

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

Selectable RATE, MAX, COUNT and DOSE modes.
Separate setups for up to four external detectors.
Logging requires the optional Lumic Data Logger Kit.

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

External detector setups	Up to 4; GM, scintillation, proportional or neutron1
Compatible external detectors	Up to 4 external GM, scintillation, proportional or neutron detectors1

Performance

Linearity	±10 %1

Measuring range

Response time	User-selectable from 1 to 60 seconds, auto SLOW, auto FAST, fixed SLOW (22 s), fixed FAST (4 s)1

Electronics & signal

Detector high voltage	300–2400 V DC1
Detector bias	300 to 2400 Vdc1

Connectivity & interface

Count display range	0–999 million counts; operational range depends on detector and dead time1
Communication	USB; optional Bluetooth/RS-232/TTL, select one output option2

Power & battery

Approximate battery life	175 h1
Power supply	4 AA batteries1
Battery life	Approximately 175 hours (series specification)1

Mechanical

Dimensions (H × W × L)	16.5 × 11.4 × 21.6 cm1
Weight excluding detectors and clips	0.9 kg1

Environment & ratings

Operating temperature	−20–+50 °C1
Enclosure rating and conditions	IP531

Ordering & accessories

Part number	48-42891
Logging capacity (optional)	Up to 1000 data points; Lumic Data Logger Kit required1

General

Analyzer	SCA with upper window2

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

Models

5 models in the series. Filter or scroll the table to compare.

5 / 5

Model	Part number1	Internal detector1	Internal detector range1	Dose response condition1
3003i	48-4326	Energy compensated GM	1 µSv/h to 50 mSv/h (0.1 mR/hr to 5 R/hr)	–
3003i/1	48-4378	CsI scintillator, 18 x 18 mm	Background to 500 µSv/h (50 mR/hr)	Nonlinear energy response; dose and exposure readings may be over- or under-reported
3003i/3	48-4411	Energy compensated GM	1 µSv/h to 250 mSv/h (0.1 mR/hr to 25 R/hr)	–
3003i/4	48-4326-4	Energy compensated GM	10 µSv/h to 500 mSv/h (1 mR/hr to 50 R/hr)	–
3003i/6	48-4326-6	Energy compensated GM	40 µSv/h to 10 Sv/h (4 mR/hr to 1000 R/hr)	–

Documents

PDFModel 3003 Series Multi-Detector Survey Meter with Optional Internal DetectorDatasheet · 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 3003 Series Multi-Detector Survey Meter with Optional Internal Detector
Publisher: Ludlum MeasurementsDatasheet p. 1, Configurations table; p. 2, Specifications (COMPATIBLE DETECTORS); p. 2, Specifications; p. 2, Specifications (DISPLAY RANGE and NOTE) … Checked 2026-10-16
2
Model 3003 Series Multi-Detector Survey Meter
Publisher: Ludlum MeasurementsProduct page Introduction; Features; Options tab (Data Output Options) Checked 2026-10-16