17
Functions
DME and DMS
Dosing monitoring
Applies to all DME 2 to 48 and DMS AR
The dosing monitor is designed to monitor the dosing of
liquids which may cause gas accumulation in the pump
head, thus stopping the dosing process even if the
pump is still operating.
For every measured dosing stroke, the dosing monitor
gives a pulse signal to the level input so that the pump
can compare performed pump strokes (from internal
stroke sensor) with externally measured physical
strokes (from the dosing monitor). If an external dosing
stroke is not measured together with the internal dosing
stroke, this is considered a fault that may have been
provoked by an empty tank or gas in the dosing head.
When used together with a DME pump, the monitor will
only operate if it is mounted on the suction side of the
pump.
When used together with a DMS (A, AR) pump, the
monitor will also operate if it is mounted on the
discharge side of the pump.
The dosing monitor should be connected to the level
input (pins 2 and 3). This input must be configured to
dosing monitoringin the pump's setup menu. Conse-
quently, it cannot be used as level input.
Once the input has been set for dosing monitoring and
a dosing monitor has been connected and set, the
dosing monitoring function will be active.
Definitions:
• Correct dosing stroke: A pulse from the dosing moni-
tor corresponds to the internal stroke signal within
acceptable time.
• Incorrect dosing stroke: There is no pulse from the
dosing monitor corresponding to the internal stroke
signal within the acceptable time (the pump is not
pumping).
Logic:
If two incorrect dosing strokes are performed, the pump
will continue operating, but it will change over to alarm
mode, like in case of "low level". The red indicator light
will be on and the alarm output, if any, will be activated
(variant AR).
For each correct stroke the counter is reset and the
alarm output, if any, is deactivated.
Operation in connection with vent valve:
TM02 2029 3201 - TM02 2030 3201 - TM02 2031 3201
Monitor mounted on suction side
(DME and DMS)
Monitor mounted on discharge side
(DMS only)
Dosing stoke measured
Dosing stoke measured
Dosing stoke measured
Monitor mounted in dosing tube.
In discharge tube: DMS (in-line)
In suction tube: DME and DMS (in-line)
TM02 2048 4802
Dm123.book Page 17 Tuesday, February 8, 2005 8:24 AM
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