20
4.
Start-up
4.1
Factory Set Parameters
The mass flowmeter leaves the factory ready to be used. All process data has been
programmed according to the customer order. See factory programming sheet delivered with
the flowmeter.
When no process details were supplied at the time of order, the mass flowmeter is
programmed to a standard default set of values and functions.
The current and pulse outputs treat all flows as positive. The actual flow and quantity is
thereby measured independent of the flow direction. The indicator will indicate a “ – “ or “ + “
in front of the flow rate.
These factory-set settings for current and pulse may cause an error under the following
conditions: When the pump is stopped and a reverse flow is present, which is larger than the
low flow cut-off or when totalizing should be indicated for both flow directions.
To avoid these possible problems:
a) Set flow mode (Fct. 3.1.8) to either flow > 0 or Flow < 0, so that back flows are ignored.
or
b) Increase Low Flow cut-off (Fct. 3.1.7) so that small back flows are ignored.
or
c) Set the alarm output (Fct. 3.5.1) to DIRECTION so that external equipment can
differentiate between positive and negative flows.
4.2
Initial Start-up
•
Please check that the power supply corresponds to the information supplied on the data
plate.
•
Switch on the power supply.
•
On switch-on, the signal converter first carries out a self-test. The following sequence is
displayed:
TEST
10 E
PX.XX
Primary Head
Software Version
STARTUP
Mass flow will be displayed following a brief settling phase for the primary head.
•
For stable and accurate mass flow results the following should be checked:
a) The quality of the mechanical installation. See Sect. 2.
b) A good zero point calibration should be done. See Sect. 4.4. Further information
regarding zero point calibration can be found in Sect. 5.
A minimum warm-up time of 30 minutes is recommended to ensure
stable measurement operation.
