RF exposure in complex environments

Because permissible exposure levels or Action Levels (ALs) vary with frequency the Nardalert S3 and RadMan 2LT & XT have shaped alarm thresholds. A shaped alarm threshold means the unit is able to cope with multiple signal environments and will alarm at a set level regardless of the AL changing with frequency. The first alarm is triggered typically at 50% of the AL with a second alarm at 100%.

Personal Monitors

More about Personal Monitors

A flexible EMF safety solution

Field strengths can change over time: increased call traffic, new installations, fault conditions or maybe just an antenna installed in the wrong place all mean that it’s really tricky to prove compliance by periodic measurements with survey equipment.

Personal monitors are a flexible solution in that they continuously monitor whatever field strength the user is exposed to, providing an alarm when the field strength starts to become significant with regard to the Action Level (AL). It’s worth noting that even if a monitor alarms at 100% it’s unlikely there has been a true over exposure. Certainly some action is required (it’s why it’s called the Action Level), such as performing more detailed measurements to determine the field strength or relocating or reducing system power.

Even so you don’t want false alarms causing costly stoppages so it’s important that a personal monitor is as accurate as possible. Narda designed the very first personal monitor over 30 years ago so it makes sense they lead the way in design and specifications.

The RadMan 2LT is a low cost unit designed to be the telecoms workhorse covering a reduced frequency range and the RadMan 2XT covers a wider frequency range (but without a thermocouple sensor).

The Nardalert S3 has a wide frequency range covering the MF & LF bands with a unique low frequency sensor & frequencies up to 100 GHz with a thermocouple sensor ideal for radar applications.


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