AMI Analyzer Manual •
••
• 14
Sensor replacement procedure:
The sensor is provided in a special sealed bag. Do not open this until you are totally ready to install the
sensor.
Before installing sensor, turn ON power.
1. Unscrew the sensor unit cap.
2. Carefully remove old cell.
3. Inspect the sensor unit cavity, and if any sign of moisture clean it out with a Q tip or similar. Make sure
that the contact springs inside the sensor unit are intact. Be careful not to snag them with the Q tip.
4. Carefully open the bag using a pair of scissors or a knife. Make sure you don’t stab the sensor! Make
sure that there is no sign of any liquid in the bag, if so do not proceed, you need a new sensor. Be
careful that you don’t poke anything such as a fingernail through the membrane.
5. Remove shorting clip. This may be found on the top of the sensor.
6. Slide the sensor into the sensor unit (gold plated contact side of sensor should be facing up touching the
sensor unit contacts. The membrane side is covered by a convex gold plated mesh). Be careful not to
touch the membrane while doing this - if the membrane is punctured the sensor must be replaced.
7. Carefully replace the cap, making sure that you do not cross thread it, and tighten firmly by hand. Do
not over-tighten.
8. Allow the sensor to stabilize for a few minutes and then calibrate it preferably using known fresh air as
the calibration gas.
Calibration:
For percent level analyzers, the sensor will stabilize within a few minutes, and it may be calibrated almost as
soon as it has been installed.
1. Either expose the sensor unit to known good fresh air, or using a user-supplied valve, flow a
known good span gas past the sensor.
2. If calibrating on air, adjust the system gain so that the reading on system display is 20.9%.
3. If using a calibration gas, read the value on the gas bottle label.
4. Adjust the system gain until the reading on the system display corresponds to the value on the
gas bottle.
To Next Page
Loading...