Analog Data Output; Sensitivity Compensation - Panasonic MEW01 351 Planning Manual

Panasonic Electric Works Nordic AB
MEW01351 Rev: -
18.6
18.7
Planning Instructions Fire alarm system EBL512 G3, V1.1.x
data1 = The average smoke obscuration value (S) for 60 seconds before the alarm
threshold level was passed.
data2 = The sum of the difference between the smoke obscuration value (S) and the
alarm threshold level every second for nine seconds after the counter shows "9".
data2' = The sum of the difference between the 2S+deltaT value and alarm threshold
level every second for nine seconds after the counter shows "9".
delay time is depending on other alarm and filtering algorithms (see
chapter "Functions / Services / Features", page 89).
4300: Alarm delay time is depending on other alarm and filtering
algorithms (see chapter "Functions / Services / Features", page 89).

Analog data output

The smoke obscuration value (%/m) and the temperature (°C) can be
shown via the c.i.e. A new value is calculated every second. (The
smoke obscuration value is an average value for the last four seconds.)
The following is valid for the different type of detectors:
4352: This detector has no analog output.
4350: This detector has no analog output.
4301: This detector has a smoke obscuration value output in the
NORMAL mode.
4300: This detector has a smoke obscuration value output and a
temperature value output in the NORMAL mode.

Sensitivity compensation

In order to maintain a constant sensitivity regardless of the contami-
nation of the detector, a Contamination Compensation Factor (CCF) is
calculated during a 36 hours period as follows:
During 13 minutes, all smoke obscuration values are saved and an
average value is calculated. The CCF will be changed if it is lower
than the actual CCF, else no change.
After 18 hours, the CCF will be changed if it is lower or higher than
the actual CCF. (It will normally be higher by contamination.)
After 18 hours more (totally 36 hours) the CCF will be changed if it is
lower or higher than the actual CCF and it will be saved in the
detector's EEPROM, so it can be used e.g. after the detector has been
without power supply. A new 36 hours period starts.
Max. compensation is 2 %/m. A service signal will then be activated
and shown in the c.i.e.
The following is valid for the different type of detectors:
4352: This detector has no sensitivity compensation.
4350: This detector has sensitivity compensation (but no service
signal output).
4301: Sensitivity compensation is depending on other alarm and
filtering algorithms (see chapter "Functions / Services / Features",
page 89).
4300: Sensitivity compensation is depending on other alarm and
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4301: Alarm