Aalborg GFC User Manual
Page 25
7.2.17.2 Adjust Scaling
Using a digital multimeter connected to either the 0 to 5 VDC or 4 to 20 mA sig-
nal at the 15-pin “D” connector, set the flow rate on the GFC to full scale flow (5
VDC or 20mA). Maintain full scale flow, and adjust the potentiometer [R3] on the
LCD printed circuit board to desired full scale flow reading.
7.2.17.3 Change Decimal Point
To change the decimal place on the LCD display readout, simply move the
jumper to the appropriate location on the [8] pin header block. The numbers are
printed to the side of the connections. Do not attempt to place more than one
jumper for decimal setting.
8.
TROUBLESHOOTING
8.1
Common Conditions
Your Mass Flow Controller was thoroughly checked at numerous quality control
points during and after manufacturing and assembly operations. It was calibrated
in accordance to your desired flow and pressure conditions for a given gas or a
mixture of gases.
It was carefully packed to prevent damage during shipment. Should you feel that
the instrument is not functioning properly please check for the following common
conditions first:
✓
Are all cables connected correctly?
✓
Are there any leaks in the installation?
✓
Is the power supply correctly selected according to requirements?
When several meters are used a power supply with appropriate current
rating should be selected.
✓
Were the connector pinouts matched properly? When interchanging with
other manufacturers' equipment, cables and connectors must be carefully
wired for correct pin configurations.
✓
Is the pressure differential across the instrument sufficient?
21
JUMPER POSITION
MAXIMUM SCALABLE DISPLAY READING
“0”
1999
“1”
199.9
“2”
19.99
“3”
1.999