Page 13 Instruction manual Parker X-Flow FM-1407 Rev - 11/2021
because if the tubing has been exposed to air, introducing these fluids will tend to clog up or corrode the
system due to a chemical reaction with oxygen or moist air. Complete purging is also required to remove
such fluids from the system before exposing the system to air. It is preferred not to expose the system to
air, when working with these corrosive fluids.
2.11 Zeroing
The zero point of each instrument is factory adjusted. However, the zero point may shift slightly due to
temperature, pressure, gas type and mounting position influences. If required, the zero point of the
instrument may be re-adjusted.
Zeroing is possible over RS232 Flowbus®, RS485 Modbus® or by means of using the micro switch
button on top of unit. Zeroing by means of using the micro switch button on top of unit is described in this
manual.
•
Warm-up, pressurize the system, and fill the instrument according to the process conditions.
•
Make sure no flow is going through the instrument by closing valves near the instrument.
•
The setpoint must be zero.
•
Press the micro switch button on top of unit and hold it. After a short time, the red LED will go ON
and OFF, then the green LED will go ON. At that moment release the micro switch button on top of
unit.
•
The zeroing procedure will start at that moment and the green LED will blink fast. The zeroing
procedure waits for a stable signal and saves the zero. If the signal is not stable zeroing will take a
long time and the nearest point to zero is accepted. The procedure will take approx. 10 sec with a
stable signal.
•
When the process is completed the green LED is on continuously.
For information how to start the zeroing procedure over RS232 Flowbus® or RS485 Modbus® check
section 4.1.4, “Auto Zeroing”
Summary of Contents for X-Flow FM-1407
Page 1: ...11 FM 1407...
