Bronkhorst®
Instruction Manual IQ+FLOW® Series Digital Mass Flow / Pressure Controllers for Gases
9.17.045V
11
2.10
Zeroing
The zero point of each flow meter/controller is factory adjusted. If required the zero point can be re-adjusted over RS232 or
by means of the micro-switch. Procedure for zeroing by-micro-switch (not for pressure meter/controller):
·
Warm-up, pressure up 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 micro-switch 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.
·
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 long and the nearest point to zero is accepted.
The procedure will take approximately 10 seconds.
·
When the indication is showing 0% signal and the green indication LED is burning continuously again, the zeroing
action was successful.
2.11
Calibration
Each IQ+FLOW® instrument is factory calibrated. Bronkhorst certifies that all instruments meet the rated accuracy.
Calibration is performed using measurement standards traceable to the standards of the Dutch Metrology Institute (VSL).
Calibration certificates are included in the shipment. When operated properly (clean gas, no pressure shocks, no vibrations,
no thermal shocks, etc.), regular maintenance is not required. However, periodical inspection, recalibration or verification of
the accuracy may be subject to individual requirements of the end-user.
2.12
Supply pressure
It is recommended to turn on power before applying pressure and to switch off power after removing pressure.
Be sure to apply the specified operating pressure(s). Avoid pressure shocks and bring the fluidic system gradually up to the
level of operating conditions; open and close the fluid supply gently.
