7.Zero Adjustments
The zero should be checked as detailed in section C part 2. If an adjustment is needed the Zero Potentiometer should be carefully turned until the output (VDC) becomes zero.
Caution: Do NOT adjust the Gain Potentiometer when adjusting the zero or the unit will need to be recalibrated.
Making Zero Adjustments Using a Small Flathead Screwdriver
Care should be taken to only make small adjustments to the zero potentiometer. If too much of an adjustment is made and difficulties are being experienced in achieving a zero reading then turn the potentiometer fully
8.Recalibration
If recalibration is required please contact the Omega Engineering Customer Service Department.
9.Changing the Calibration Gas – FMA 3400/3400ST Series Only
The FMA 3400/3400ST Series may be calibrated for up to three gases. These gases, their corresponding flow ranges and accuracy specifications are detailed on the calibration certificate.
The calibration gas required is determined by selecting the corresponding dip switch on the front panel of the display.
