Setting zero is the key for the nicety measurement of flow meters. After a primary
meter installed, this operation should be done first. Steps as follows:
- After connecting the cable and power on the transmitter. About five seconds
elapsed; automatically turn into normal operation menu, and display mass
flow and gross. Keep for 5 minutes up for warm-up.
- Open valves on upper and lower reaches of line, keep large flux (larger
more than 50% full range) continually for 20~30 minutes. Ensure there is no
air in the tube, no remain stress on the meter and all screws in line are never
unscrewed.
- Firstly close the valve on the lower reaches of the line, then close the upper valve. Surely fulfill with fluid in the flow meter, there is no air bubble in and fluid steadied. Keep this state for more than 5 minutes.
- Press down-key to scroll the menu to the setting zero, press the return-key and the synchronous return-key at the same time, then the meter will enter the zero setting state. After setting, observe for minutes, if DP was small, such as less than ±15, the setting would be successful. Or else repeat setting zero steps above.
Should observe the DP zero ever period of time (such as months). If exceeds ±20,
must execute the steps of setting zero, to insure meters measurement correctly.
Setting zero must be operated while the liquid in line at rest.