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3.2. Electrode wiring
Yellow: Vin+
Black: Vin-
Red: 4-20mA Input
Green: Ground, 0VDC
NOTE:
1. The standard cable length is 3 feet. If another cable length is needed, contact your supplier or manufacturer.
The maximum length should be no more than 30 feet to avoid signal loss.
2. The output current of power source should be more than 100 mA.
3. The A420-FCL output can be measured by multimeter or other devices which allow the analogue input and
measurement. The maximum loop resistance of the devices should be less than 400Ω for testing the current
output of A420-FCL (4-20mA version).
6. Make sure the silicone band is not covering the vent hole and screw
the membrane cap on the electrode until it is finger tight. The vent hole
will allow excess IFG to escape.
► Note:Do this step over a sink with running water to rinse away excess
IFG.
7. Push the silicone vent hole band back into the recess and rinse the
electrode thoroughly before using.
8. Wipe water off the electrode gently. Avoid touching the membrane
after assembly.
The electrode is now ready for polarization and conditioning steps.
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