Aalborg Vortex Insertion - Manual (Page 73)

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6.2 Temperature and Pressure Sensors Calibration*
7. START UP
7.1 Cautions Prior to Start Up
In general, it is good practice to purge the line slowly to prevent unnecessary
damage to the meter.
Once the pipeline is pressurized, check the flow meter and flanges for leaks.
The temperature and pressure transducers should also be checked for leaks.
The meter may give erratic outputs during purging the line if the power has been
turned on before purging the line.
The Vortex flow meter does not have the capability of measuring two phase flow.
In liquid applications, the line should be totally purged of air before powering the
flow meter.
During start up, remember that the meter will not read accurately until the flow
rate meets or exceeds the minimum flow rates stated on the I.D. sheet. The
maximum and minimum flow rates for a specific flow meter can be found on the
meter I.D. sheet.
NOTE: If recalibration of the Temperature or Pressure sensors is
required, it is recommended to use the Aalborg
® supplied calibration
and maintenance software for analog output calibration. This software
includes an automated calibration procedure which may radically
simplify calculation of the offsets and spans variables and, the reading
and writing for the EEPROM table.
,
NOTE: If your flow meter is equipped with optional Temperature and
Pressure sensors, then they were calibrated at the factory. There is no
need to perform Temperature and Pressure sensors calibration unless
the CPU / TERM PCB or actual Temperature or Pressure sensor was
replaced. Any alteration of the temperature or pressure input scaling
variables in the EEPROM table will VOID calibration warranty supplied
with instrument.
,