Overview

This document provides technical specifications, operational parameters, and usage guidelines for the Unfors NED radiation measurement device. It includes details on dose rate ranges, accumulated dose ranges, trigger levels, exposure times, and compliance with electromagnetic compatibility (EMC) standards.

Measurement Ranges and Units

• Dose Rate Range: 0.18 mSv/h to 9.0 Sv/h (equivalent to 50 nGy/s to 2.5 mGy/s, or 18 mR/h to 880 R/h)
• Accumulated Dose Range: 50 nSv to 9999 Sv (equivalent to 50 nGy to 9999 Gy, or 4.9 µR to 9999 R)

Trigger Levels and Exposure Time

• Start Trigger Level: 0.27 mSv/h (75 nGy/s) - threshold to begin measurement
• End Trigger Level: 0.18 mSv/h (50 nGy/s) - threshold to stop measurement
• Exposure Time: Ranges from 10 milliseconds to 9999 seconds; defined as the total time the sensor signal remains above the end trigger level after initially exceeding the start trigger level.

Display and Measurement Details

• The device displays the highest average dose rate measured over 1-second intervals since the last reset.
• When continuously measuring, the average dose rate updates every second on the display.

Technical Specifications

• System Bandwidth: 10 Hz (3 dB)
• Sensor Size: 6 x 11 x 22 mm
• Sensor Cable Length: 1.5 meters
• Power Source: Two LR06 (AA) alkaline batteries
• Battery Life: Approximately 130 hours
• Auto Power Off: Activates after 2 hours without radiation detection or user interaction
• Display: 4-digit LCD
• Instrument Housing Size: 82 x 98 x 21 mm
• Total Weight (with batteries): 200 grams

Compliance and Durability

• The device meets EMC requirements according to EN 55 011:1990 Class B, EN 61 000-4-2:1995, and EN 61 000-4-3:1996 standards.
• Sensor, cable, and housing can be disinfected using 70% medical alcohol wipes.

Included Accessories

• Hard carrying case
• Waist case with belt
• Bracelet

Additional Notes

The dose rate values shown after each exposure represent the highest average dose rate measured during any 1-second period since the last reset, ensuring accurate peak radiation detection.