User's Guide

SAFE-DISTANCE Quick Start Guide - USA
Contact Reactec support at [e-mail] Doc No. 290-197 v1
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SAFE-DISTANCE Proximity Detection
➢ SAFE-DISTANCE contact detection relies on the detection of a Bluetooth (BLE) signal
within one device of a signal emitted by a second device.
➢ The strength of the signal is used to indicate the proximity of the two devices. Field
evaluations have resulted in the settings within your device to most likely detect if the
distance between the two devices is less than 2m. This is deemed contact by the device.
➢ Factors can influence the consistency of when proximity is detected including the body
significantly blocking the signal between the two devices or a reflective surface creating
spurious signals.
➢ A REACTEC device will determine that it is too close to another device if the signal
strength indicates that the other device is close and the strength of signal is maintained
for at least 5 secs. This approach avoids devices being close for very short periods such as
walking past raising false alarms.
1. The HAVwear constantly scans for other HAVwear devices
2. If a HAVwear detects a number of consistent signals that tells it another HAVwear is
too close for > 5 secs the HAVwear receives a short buzz
3. The other HAVwear will only buzz if that HAVwear has also detected that another
HAVwear is too close for > 5 secs. This is usually the case but not always as one
HAVwear may have a different environment to the other eg how the HAVwear face is
orientated relative to the body
4. Once the short buzz has been emitted if the HAVwear does not detect that you have
moved away by 10% of the detected signal, it gives a second longer buzz after 30 secs
5. A long buzz will be repeated every 30 secs until you move away
6. There can be a delay until receiving the long buzz – which can therefore be received
after you have moved away. The display will return to HAV points or blank when the
device has detected that you have moved away
7. When not detecting a HAVwear too NEAR, the display shows HAV exposure points or
is blank for SAFE-DISTANCE only HAVwear.