Function group
PROCESSING PARAMETERS
RECOVERY TIME
ECC
After the electrode cleaning procedure is completed, the signal outputs may
be unsteady for a little while. This is due to electrochemical potentials caused
by electrostatic charging of the fluid during the cleaning cycle.
If this is the case, then the recovery time can be extended using this function.
Caution!
During the recovery time (max. 255 s) the last value registered before cleaning
is given. If a very long time has been set, then the system will not detect any
possible change in flow (e.g. standstill) during this time.
6
max. 3-digit number: 1...255 s
Factory setting:
5 s
AMPLIFIER
MODE
Selection of the amplifier mode, e.g. for strongly fluctuating flow rates.
The Promag 33 amplifier has an automatic amplifier booster controller. This
ensure that the amplifier always operates at optimum amplification according
to the flow velocity of the fluid. High accuracy is thus maintained over the wide
dynamic range of 1000:1. Applications with rapid and strongly fluctuating
flow rates can still affect measurement and the desired accuracy will not be
achieved. In such applications it may be better under certain circumstances to
program the amplifier at a fixed amplification step.
Caution!
With the settings “MODE 3” and “MODE 4”, ensure that the actual flow velocity
does not exceed the preset flow spans. If these are exceeded, then the
flowrate is not recognised as an error by the measuring system and faulty
measurement may result.
6
NORMAL
automatic amplifier booster controller
MODE 1 for flow rates 0...>12 m/s
MODE 2 for flow rates 0...12 m/s
MODE 3 for flow rates 0...4 m/s
MODE 4 for flow rates 0...1 m/s
DELAY
Within the measuring amplifier, the delay of the automatic amplification
switchover (see function “AMPLIFIER MODE” → NORMAL) may be varied:
• In case of an overload, the amplification is immediately reduced
independently of the value originally set.
• In case of a massive underload, the ’n’ measured results (samples) are
waited for before the amplification is once again increased. This is especially
useful if occasional and rapid flow peaks occur (e.g. with piston pumps).
The entered number thus corresponds to the number of measuring events
(samples) to be ignored before a switch-over of the amplifier booster is
necessary.
6
max. 4-digit number:
10
...1000
Caution!
Caution!
6 Description of Functions Promag 33
76 Endress+Hauser
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