17
Programming
Version: FAU_M_EN_170308_E004
3.4.4.
Flow-Limit MIN
Now enter the min. limit. If the flow rate bypasses this limit, the switch output MIN will be activated. Enter the
min limit keeping to the unit and resolution selected under 3.1.2 and 3.1.3 .
Example: the volume flow must not bypass 1.185 litres per minute.
to chose the cursor position
to select 0 to 9 for the present cursor position
to enter
Enter with and continue with the hysteresis for the min limit.
3.4.5.
Hysteresis for Limit MIN
If the volume or mass flow is unstable, the switch output may start to "scatter" when the flow rate approaches
the limit. To avoid this enter a hysteresis which is slightly higher than the percentual flow variation within the
min. limit range.
Example:
with flow variations of 7.0 % in the lower range, the hysteresis should be approx. 7.2 %.
to chose the cursor position
to select 0 to 9 for the present position
to enter
Entering with will terminate programming. Press to get back to the measuring mode.
Battery Lifetime
3.5.
The FAU has a battery to maintain all parameter settings and counts when the FAU is turned off. With normal
operation (8 h per day) the battery will last for at least ten years.
When the battery becomes low or fails, the FAU will inform you on this
with the following display after switching on.All parameters are lost now.
Press to remove this display.
The FAU will go to the first parameter level "K-Factor" (see chapter 3.1.1). After re-programming you can go on
operating.
WARNING!
If the FAU was turned off now, all parameters would be lost again. This would require a new programming of the
FAU each time it had been turned off. You should therefore send the FAU back to KEM to have the battery
replaced.
