4�5 Safelink; What Is Safelink - Honeywell Impact Series Operating Instructions And Maintenance Manual

4�5 Safelink
4�5�1 What is Safelink?
Safelink is a confined space entry communication system between instruments,
fitted with the Safelink feature. It allows one instrument (the 'attendant') to display
the gas readings measured by the other connected instrument (the 'entrant'), up
to a maximum cable length of 100m. Safelink also provides an automatic timed
response system requiring the Entrant's instrument to return a signal, activated
by the entrant, within a user-specified time interval. Failure of the user to respond
will cause an alarm to be raised on the Attendant's instrument. Additionally, any
continued pressing on any button on the entrants instrument at any time will cause
an 'Emergency' message to appear on the attendant instrument - similar to the action
of a panic button. In Safelink mode the entrant instrument can neither be switched
off, nor can the pump feature (where fitted) be used on either instrument. It will be
found that while the pump is running the Safelink option on the instrument menu
system has been removed. Furthermore, if an attempt to start the pump is made
(on either the attendant or entrant instrument) during Safelink operation an alarm
condition is generated and Safelink Mode has to be exited.
Safelink mode cannot be entered when the batteries are low (i.e. there is less than
1 bar on the battery indication meter).
In some instances a Fault or Warning will not be displayed on the Entrant instrument.
In this case it is important to note that gas alarms on the Entrant instrument are still
indicated on the Entrant and the Attendant instruments.
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