General Description; Technical Data - Grundfos GRA1031 Instrucciones De Instalación Y Funcionamiento

CONTENTS
1.

General description

1.1 Definitions
1.2 Logic
2.

Technical data

3. Mounting and setting of dosing monitor
4. Disposal
Prior to installation, read these installation
and operating instructions. Installation and
operation must comply with local
regulations and accepted codes of good
practice.
1. General description
Fig. 1 Monitor mounted on pump discharge side
The dosing monitor is designed to monitor the dosing
of liquids which may cause gas accumulation in the
dosing head, thus stopping the dosing process even
if the pump is still operating.
During the dosing process, the dosing monitor gives
pulse signals to the monitor input so that the pump
can compare performed dosing strokes (from internal
stroke sensor) with externally measured physical
strokes (from the dosing monitor). If an external
dosing stroke is not measured as a result of the
internal dosing stroke, this is considered a fault that
may have been provoked by empty tank or gas in the
dosing head.
DME/S 2 to 48: The dosing monitor should be
connected to the level input. This input must be
configured for dosing monitoring. Consequently,
it cannot be used as a level input.
DME 60 to 940: The dosing monitor should be
connected to the input for dosing monitoring. This
input must be configured for dosing monitoring.
Once the input has been set to dosing monitoring
and a dosing monitor has been connected and set,
the dosing monitoring function will be active.
4
1.1 Definitions
Correct dosing stroke: A pulse from the dosing
Page
monitor corresponds to the internal stroke signal
4
within acceptable time.
4
Incorrect dosing stroke: There is no pulse from the
4
dosing monitor corresponding to the internal stroke
4
signal within the acceptable time (the pump is not
5
pumping).
5
1.2 Logic
If a number of incorrect dosing strokes are
performed, the pump will continue operating, but
it will change over to alarm mode. The red indicator
light will be on and the alarm output, if any, will be
activated (variant AR).
When a correct dosing stroke is detected, the red
indicator light is turned off and the alarm output,
if any, is deactivated.
2. Technical data
Maximum pressure
Maximum liquid temperature
Maximum liquid viscosity
*) DME 60 to 940: When pumping a liquid with a
higher viscosity, it is recommended to test the
performance with the liquid to be pumped.
Materials in contact with the pumped liquid
Housing
Gaskets
10 bar
50 °C
500 mPa s*)
Polypropylene
EPDM/FKM