200
Chapter 6 • Contamination detection and maintenance prognosis
Connection of detectors Labor Strauss
6
Contamination detection and maintenance prognosis
This part describes when the control panel will indicate a contamination – technical message – and how
the detector replacement will be predicted. A contamination can only be found out by elements which
have an optical sensing chamber. Heat detectors and manual call points as well as modules do not
provide a contamination. Furthermore, this description does not apply to detectors that are connected in
conventional technology.
The analogue value of Series FI700 or FI750 elements is not to be confused with the measured value
of the contamination! These are two different measured values. Series FI700/FI750 elements have, for
example, an analogue value of 32 (optical detectors, manual call points, ...) which can NOT be used to
determine the degree of contamination.
6.1
Series FI700/FI750 elements on the BC216 / BC600
The detector responds with an estimate of its contamination. A value of 32 means that the detector is
clean; in the case of a value of 192, the contaminated flag will be set in the device status. If the flag has
been set, a technical message with the information that the detector is dirty will be output.
6.2
Maintenance prognosis
The maintenance prognosis indicates a detector's degree of contamination, or rather its contamination in
the past months, and calculates when it will be necessary to replace a detector, provided that the con-
tamination will progress at the same rate.
For the BC600 or PARSOFT-3, the following holds true: the % values (this is the degree of contamina-
tion) are recorded within 7 days, for 99 elements on average. If more elements have been installed, find-
ing out the percentage takes longer because this process is based on the polling cycles.
In the case of the BC216, every 30 days an average value is calculated based on the contamination data
(measured values), – this corresponds to the current contamination of the detector – and only after the
mentioned period of time has elapsed will it be indicated on the control panel or in PARSOFT.
The above-mentioned monthly average values can be read out by means of PARSOFT and are shown in
the historical columns of the read-out of measured values. The maintenance prognosis is created when 6
historical monthly average values are available. As method the linear regression is used.
6.2.1
Series FI700/FI750 elements on the BC216
A value of 32 means that the detector is clean; in the case of a value of 192, the contaminated flag will
be set in the device status. At a contamination value of 96, which corresponds to 40% of the drift com-
pensation, the Fire Detection Control Panel Series BC216 will output a technical message with the
information that the detector is dirty.
6.2.2
Series FI700/FI750 elements on the BC600
The contamination data are directly interpreted and indicated as percent value.
6.3
Detection of detector replacement
When power is applied to the detector, the production date will be read out. If it differs from the one
that has been read out last, a detector replacement will be detected.
If a detector replacement is detected, the detector's historical measured values will be discarded and the
data for the calculation of the maintenance prognosis will also be reset. It is not necessary to confirm
the detector replacement. The detector replacement is detected automatically. On the BC600, the histor-
ical course of the detector's measured values (contamination) can be deleted individually.
Connection-LST.odt / 2009 / AN9161298
200/200
200
