Features
- Rugged, Low-Weight microR Survey System
- Multi-Function Pole-Mounted Digital Display
- Very Sensitive Plastic Scintillator Gamma Detector
- Large Backlit Display with Ambient Light Sensor
- Ball-Joint Mounted Display Unit with Adjustable Viewing Angle
- Adjustable Pole Length and Handle Position
Visuals
Main Product Image: A full view of the Ludlum Model 30-6 Extended Reach microR Survey Meter, featuring a long adjustable pole, a detector head at the end of the pole, and a digital display unit mounted on the pole. The display unit is shown in detail in a separate inset image.
Close-up of Pole and Handle: An inset image showing a close-up of the adjustable pole and handle mechanism of the Model 30-6 survey meter, highlighting its construction and adjustability.
Meter Face Detail: An inset image displaying the Model 30 meter face. It features a digital screen showing a reading of '0', several control buttons, and indicator lights.
Specifications
Part Number: 48-4195
Detector: EJ-212 plastic scintillator, 15.2 x 2.5 cm (6 x 1 in.) (D x L)
Sensitivity (¹³⁷Cs gamma): Typically 150 kcpm per µSv/h (1500 cpm per µR/hr)
Energy Response: Energy dependent
Linearity: Reading ±10% of actual value
LCD Display: 3 digit LCD with large 13.4 mm (0.53 in.) digits, low-battery indicator, MAX, ALARM, MUTE
Backlight: Built-in ambient light sensor automatically activates low-power LED backlight, unless internal dipswitch is set to continuous-on (will reduce battery life). Alarm light intensity varies based on ambient light levels.
Range: 0.00 to 2000 µR/hr; 0.00 to 20 µSv/h
User Controls:
- OK button: Long press powers instrument ON and OFF; Toggle click audio; Acknowledge audio alarms; Reset MAX mode; Start/Reset the COUNT time.
- UNITS button: Long press cycles through configured display units; two sets of units can be configured for RATE/MAX mode and COUNT.
- MODE button: Long press cycles through the operating modes: RATE, MAX, COUNT.
Response Time: User-selectable from 1 to 60 seconds, auto-response rate FAST or SLOW, or Fixed FAST and SLOW
Alarms: Count rate, exposure/dose, and count alarm setpoints adjustable over the display range
Sigma Audio Alarm: Instrument takes a baseline reading at startup. If subsequent readings exceed two sigma above baseline, a steady pulse pattern will be heard.
Fault Detection: Overload protection, Loss of Count protection, Over-Range, Calibration Expiration Lockout
Dead Time Correction: Employs first and second order corrections for extended performance
Operating Voltage: 700 to 1100 Vdc
Audio: Greater than 75 dB at 0.6 m (2 ft), approximately 4 kHz
Click Audio Divide: x1, x10, x100, x1k
Power: Two alkaline or two rechargeable "AAA" batteries
Battery Life: Approximately 100 hours of operation, 24 hour low battery warning
Construction: Display: High-impact plastic with water-resistant rubber seals; Detector Housing and Pole: Aluminum with powder-coat finish
Temperature Range: -20 to 50 °C (-4 to 122 °F), may be certified for operation from -40 to 65 °C (-40 to 150 °F)
Environmental Rating: NEMA rating of 3x or IP rating of 52 with audio hole seal option (hole seal option will reduce maximum volume by approximately 10 dB)
Overall Length: Adjustable from 111 to 161 cm (43.6 to 63.4 in.), with 11 different length settings
Overall Weight: 2.9 kg (6.5 lb)
Contact Information
Ludlum Measurements, Inc.
P.O. Box 810, Sweetwater, Texas 79556
Tel: 800-622-0828 / 325-235-5494
Fax: 325-235-4672
Email: sales@ludlums.com
Note: Specifications subject to change without notification. Ludlum Measurements, Inc. is not responsible for errors or omissions.
Document Date: Sep 2025
