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Monitor 200 Radiation Detector

Multi‑Purpose Radiation Survey Meter with USB & Bluetooth Connectivity

The Monitor 200 is a versatile, high‑performance radiation survey meter designed for accurate measurement of alpha, beta, gamma, and X‑ray radiation. Built for professional monitoring in laboratory, industrial, and field environments, it delivers reliable real‑time readings with flexible display and connectivity options.

Comprehensive Radiation Measurement

The Monitor 200 provides radiation readings in multiple selectable units, allowing users to view data in the format best suited to their application. Supported measurement units include:

  • Counts Per Minute (CPM)
  • Counts Per Second (CPS)
  • µSv/hr
  • mR/hr
  • Accumulated Counts

This flexibility ensures compatibility with a wide range of monitoring, safety, and compliance requirements.

User‑Friendly Design & Alerts

A digital backlit display ensures clear readability in both bright and low‑light environments. For enhanced situational awareness, the Monitor 200 features a red count indicator light and an audible beeper that signals each detected event.

User‑adjustable features include:

  • Adjustable counting timer
  • Customizable loud alarm thresholds

These settings allow the Monitor 200 to be tailored to specific operational needs while maintaining ease of use.

Built‑In Memory & USB Data Management

The Monitor 200 includes internal data memory, enabling collection and storage of radiation measurements during surveys. Included with the instrument is Free Observer USB Software (Windows compatible), which allows users to download, review, and manage data efficiently, as well as configure computer‑based alarms for added monitoring capability.

Optional Bluetooth® Connectivity

With the optional Bluetooth® module, the Monitor 200 integrates seamlessly with the Radiation Alert® Observer BLE app (available on Android via Google Play). The app provides advanced mobile functionality, including:

  • Real‑time radiation readings with descriptive labels
  • Timed counting functions
  • GPS location tagging of surveys
  • Saving and sharing survey files
  • Alarm mirroring from the instrument to the Android device

This wireless capability expands monitoring flexibility and enhances data collection in mobile and field‑based applications.

Applications & Uses

Checking accelerator & x-ray shielding for leakage, industrial gauges containing Cesium-137, Locating Sources, Personal protection, General surveying

Digital Radiation Detector Comparison

Specifications

Detector

Halogen-quenched GM tube with thin mica end window. Mica window density 1.5-2.0 mg/cm2. Effective window diameter is .360 inch. Side wall is .012 inch thick.

Operating Range

mR/hr – .001 (1µR) to 200 mR/hr
µSv/hr – .01 to 2000
CPM – 0 to 235,400
CPS – 0 to 3923
Total Counts – 1 to 9,999,000 counts

Monitor 200 Detector Window

Energy Sensitivity

1070 CPM/mR/hr referenced to Cs137
Detects alpha down to 2.5 MeV; typical detection efficiency at 3.6 MeV is greater than 80%.
Detects beta at 50 keV with typical 35% detection efficiency.
Detects beta at 150 keV with typical 75% detection efficiency.
Detects gamma and x-rays down to 10 keV typical through the window, 40 keV minimum through the case.
(Ref to Cs137)

Accuracy of Radiation Detector Device

Referenced to Cs137
Typically ±15% from factory, ±10% with NIST Source Calibration NIST Calibration Additional

Anti-Saturation

Readout will OVERRANGE in radiation fields as high as 100 times the maximum reading.

Selectable Alert Set Range

mR/hr .001 – 100 and CPM 1 – 350,000. Pulsating beeper sounds the alert. Adjustable alert levels are used for mR/hr / CPM, and µSv/hr / CPS. 70db @ 1m. Alarm will sound when in Timer Mode when set alarm threshold is reached.

Display

Graphic LCD with Backlight.

Outputs

USB for use with Free Observer USB Software for PCs
Bluetooth Option Additoinal: Wirelessly connects the instrument with an Android mobile device for use with Free Observer BLE App

Count Light

Red LED flashes with each count.

Audio Indicator

Sounds with each count (can be switched off for silent operation)

Power Requirements

USB Power or Two (2) AA alkaline batteries (included). Approx. 800 hrs @ background.

Temperature Range

-10° to +50°C (14° to 122°F)

Humidity

10% to 70% Non-Condensing.

Size

140 X 68 X 33 mm (5.5 X 2.7 X 1.3 in.)

Weight

181 g (0.4 lbs.)

Includes

Carrying Case,  Rubber Boot, Lanyard, Stand, Batteries, Mini-USB Cable, Observer USB Software Download, Observer BLE App Certificate of Conformance
Bluetooth module available for use with Observer BLE APP and Rad Responder

Options

Water Resistant Case , NIST Calibration

Limited Warranty

1 year limited warranty







What Our Clients Say

Ron Ulbrich, Geiger Counter Pro

“The Radiation Alert Ranger® is a great value for those looking for a modern Geiger counter. I found that is simple to use yet includes many advanced functions if and when you want them without obstructing the simplicity…”

Judson Kenoyer, CHP, CIH

“I have used the Monitor 4 in courses that I teach radiation safety for close to 8 years. The students love it and affectionately call it the “Batman unit” because of its use in the movie The Dark Knight Rises. It is light-weight, sensitive, and quite often out performs some of the more expensive units from other companies that we use in a lab exercise…”

Neil Breslow, NDT Supply

“NDT Supply has been working with SE International since we started business in 2000. We have found them to be easy to work with, and a very reliable and responsive supplier. Questions and issues are always handled promptly and with a smile…”