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M-4271/0707, pg. 17 of 26
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 anti-clockwise and begin making small clockwise adjustments until a
zero reading is obtained.
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.