Determine the dead time and adjusting the checkout
time
Each controlled system has a dead time. The dead time is the time
that the controlled system requires to determine a change caused
by the addition of the metered chemicals by measurement.
You have to select the checkout time greater than the dead time.
You can determine the dead time by allowing the the metering
pump to operate in manual mode and, e.g. metering acid.
NOTICE!
Dead time determination
You should only determine the dead time when the
actual process cannot be influenced in a negative way
by the manual metering.
You have to determine the time that the controlled system (there‐
fore, the entirety of the controller, sensor, measured water, flow
gauge, etc.) requires to detect the first change to the measured
value, from beginning the metering. This time is the
„Dead Time“
. A
safety margin must be added to this determined dead time, e.g.
25%. This safety margin must be determined individually for your
process. If the set value is not reached after the checkout time has
elapsed, see
Ä Chapter 6.8 „Setting the set value“ on page 29
, the
metering pump switches to base load metering.
If the control module delta
®
should not have reached a certain
threshold after the checkout time, the control module delta
®
switches to base load operation. A warning is released to the supe‐
rior system, the delta
®
solenoid metering pump in this case and the
symbol
is displayed in the status display of the delta
®
solenoid
metering pump.
Settings Comment
Settings 1 min to 999 min in increments
of 1 minute
Starting value off (= 0 min)
If the control module delta
®
is in operating mode
„Checkout time,
“
then the base load metering is active. If, however, one wants to
return to the normal control mode then the checkout time must be
restarted. Press the
-key to restart the checkout time.
Reset after activating the checkout
time
Operating Schematics / Display Symbols
30
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