How to Exchange Membrane and Electrolyte of an InPro6850iG Oxygen Sensor

This video demonstrates how to exchange the membrane module and electrolyte of the InPro6850iG Amperometric gas-phase oxygen sensor.

To request information or pricing on the InPro6850iG Amperometric gas-phase oxygen sensor, visit:
https://www.mt.com/global/en/home/pro...

The InPro6850iG can be installed directly in to the process and in contact with the gas stream, and they are easy to maintain. The following steps are the process for exchanging the membrane module and electrolyte:

After the sensor has been safely removed from the process you unscrew the cap sleeve from the shaft and gently pull it off the sensor.

Pull off the membrane body from the inner body.

Be careful, the membrane body is filled with the electrolyte which has a very alkaline pH of about 13. Contact with the skin and the eyes should be avoided at all times, so make sure that you wear protective eyewear and the required lab coat protection and gloves for this operation.

Once the used membrane body and electrolyte have been disposed of properly rinse the inner body with DI water and dry it with a clean tissue.

Visually inspect the o-rings and the washer for mechanical damage and replace them if necessary. New o-rings for each type of gas sensor can be found in the membrane replacement kit.

Take a new membrane body from the replacement kit and half fill the cavity with electrolyte, which is also part of the kit.

Make sure that the electrolyte is bubble free. Air bubbles can be removed by carefully tapping on the membrane body.

Slowly slip the membrane body over the interior body while holding the sensor in a vertical position.

The excess electrolyte will be displaced and should be removed using a
tissue.

Carefully slip the cap sleeve over the fitted membrane body and screw
it in tightly. The cap sleeve must be clean and dry. Clean up all excess
electrolyte using a clean tissue.

After each replacement of the electrolyte in the membrane, the sensor must be polarized over a period of six hours or more. For polarizing the sensor three options are available. You can use our polarizer and checking unit called sensor master. You can use the transmitter the sensor will be connected to during operation. Or you can polarize it on iSense, the PC-based asset suite that allows you to monitor the health status of your sensor. After the sensor has been polarized calibration is necessary. Using iSense this can be performed easily in a lab environment. Because the Amperometric sensors are highly linear from 0 to 100 percent oxygen, it is sufficient to perform a one-point calibration in air. The calibration itself is very fast and straightforward.

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0:00 Amperometric sensors
0:44 Membrane body and electrolyte exchange
2:38 Polarization
3:12 Calibration
3:40 Saving on investment and maintenance cost