• Radiation Alert® Sentry EC Dosimeter & Ratemeter

    The Radiation Alert Sentry EC Radiation Dosimeter & Ratemeter is ruggedized, has vibrating and audible alarms, and collects accumulated exposure in the on-board memory. Set alarms and download data with the FREE SentryCom Software

Sentry EC / Dosimeter & Ratemeter

Sentry EC Radiation Dosimeter and Ratemeter


The Radiation Alert® Sentry EC is a Personal Alarming Dosimeter / Ratemeter designed to ensure the safety of personnel that work in occupations with potential x-ray or gamma exposure.

The pocket sized unit has an energy compensated tube for a linear response to gamma and built in memory for recording data points for tracking accumulated exposure. The SentryCom Software option enables you to generate incident reconstruction for analysis. The software also permits you to easily set the vibrating and audio alert to your desired levels for dose (>1.0 mR/10 µSv) and dose rate (>1.0 mR/hr/10 µSv/hr).

Use the audio switch to choose between audible clicks with each count recieved or a discreet silent mode.


Energy Compensated GM Tube

Dose Rate Linearity

Better than ±15% up to 15 R

Energy Response

Down to 20 KeV


Typically ±15% of reading (Cs137)

Gamma Sensitivity

1.5 cps/mR/hr (Co60)

Operating Range

Dose Rate: 0.1 - 15 R/hr (1 µSv/hr - .15 Sv/hr)
Accumulated Dose: 0.1 - 65 R (1 µSv - .65 Sv)

Gamma SensitivityAudible Alarms

Accumulated Dose & Dose Rate, 90db @ 1 ft.

Alarm Thresholds

Default: Dose 500 mR / Rate 50 mR/hr
Sievert Option: Dose 5000 μSv / Rate 500 μSv/hr Alarm and warning levels are user selectable with the Free SentryCom Software.

Switch Functions

Power, Vibrate & Audible Alert, Silent Vibrating Only Alert, and Audio Clicks On/Off.

Power Requirements

9-Volt Alkaline Battery(Included) Approx. 1500 hrs at normal background.


Anodized Aluminum Housing w/ Metal Belt Clip

Energy ResponseOutputs


Temperature Range

-20° - + 50°C (-4° - +122°F)


243 g (8.6 oz)


106 x 67 x 28 mm (4.2 X 2.7 X 1.1 in)

Limited Warranty

1 year limited


Operation Manuals (PDF) English | Español | HTML5 Version (Bing Translator Available) | Quick Specs | PowerPoint | All Sentry EC FAQs
Quick Start Video Guide | SentryCom Software

Frequently Asked Questions about TheSentry EC

How many data points can the Sentry collect?

The Sentry can collect up to 1024 data points. When the limit is reached, the earliest data points then are over written by the most recent data points one point at a time. How frequently each point is collected can be set with the Optional Sentry Software.

When I connect the USB-Serial Cable to the computer, why does Windows does not recognize that the device is connected?

Most Windows operating systems will download the necessary driver for the cable from Windows Update. In the event that the driver does not install automatically, you can download and install the driver for your OS at the following page by Clicking Here

Accessories / Expand Sentry EC Alarming Ratemeter and Dosimeter


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