Changing The Sensor Sensitivity; Figure 13: Setup Procedure - Step 5; Figure 14: Changing Sensor Sensitivity - Pentair Goyen Mecair FFD Installation And Operation Manual

The Early Warning Alarm (RELAY 2) is triggered at HALF the value set for RELAY 1, which in this example this
equates to:
IMPORTANT NOTE:
Take care to ensure that the alarm level is set to more than TWICE the calculated dust level, otherwise RELAY 2 will be
triggered continuously.
STEP 5 – Set the Alarm Delay
Set the alarm delay period to a suitable value. The delay period is the period of time the FFD waits before activating
an alarm when the average plant emission exceeds the alarm setting (e.g. to avoid the alarm being triggered by the
bag-cleaning sequence).
The delay period can be either one or two minutes, depending on the type of process. Referring to Figure 13 below, adjust
the MODE slide switch as follows:
For stable, continuous processes: set the MODE slide switch to RUN 1 (for an alarm delay period of 1 minute).
•
For dynamic, unstable processes: set the MODE slide switch to RUN 2 (for an alarm delay period of 2 minutes).
•
If you are not sure of the dynamics of your process: set the alarm delay period to RUN 1, and if RELAY 2 is intermittently
•
triggered, increase the alarm delay to 2 minutes bysetting it to RUN 2.
Figure 13: Setup procedure – Step 5
STEP 6 – Complete the Setup
1. Refit any connections that were removed (i.e. relays; see the Note on page 15).
2. Refit the enclosure cover lid and secure using 4 off screws. Check that the cover lid is fitted securely and that all cable
glands are sufficiently tight.

6.3.1 Changing the Sensor Sensitivity

Figure 14: Changing sensor sensitivity

By default, the sensitivity on the FFD sensor is set to LOW, i.e. the jumper is fitted to the lower pair of pins
on the JP2 link. The HIGH sensitivity setting is approx. 10 times more sensitive than LOW sensitivity.
If during STEP 2 (see page 16) of the setup procedure it is not possible to make the STATUS LED change colour from
GREEN to RED, then it is recommended to increase the sensor sensitivity.
18 INSTALLATION AND OPERATION MANUAL – OWNER'S RECORD FFD MANUAL – FILTER FAILURE DETECTOR
1500/2 = 750 units