Endress+Hauser Oxygen Sensor COS61D

Effects on process and process control

‣ When carrying out any work on the system, take into account possible repercussions for process control or the process itself.

‣ For your own safety, only use genuine accessories. With genuine parts, the function, accuracy and reliability are also ensured after maintenance work.

1. Take it out(sensor) of the medium and dry it.

2. After 10 minutes, measure the oxygen saturation index in air.

Decide depending on the result: If the measured value is not 100 ±2 %SAT, you must maintain the sensor. Otherwise, double the length of time to the next inspection.

The following tasks are mandatory:

Effects on process and process control

‣ When carrying out any work on the system, take into account possible repercussions for process control or the process itself.

‣ For your own safety, only use genuine accessories. With genuine parts, the function, accuracy and reliability are also ensured after maintenance work.

10.5.2 Replacing fluorescence cap

The typical operating life of a fluorescence cap is more than 2 years. The sensor checks whether the cap is aging and issues a warning via the transmitter if the rate of aging reaches a specific value. The sensor is still able to measure at this stage. However, it is advisable to change the cap as quickly as possible.

Removing the old fluorescence cap

1. Remove the sensor from the medium.

2. Unscrew the protection guard.

Effects on process and process control

‣ When carrying out any work on the system, take into account possible repercussions for process control or the process itself.

‣ For your own safety, only use genuine accessories. With genuine parts, the function, accuracy and reliability are also ensured after maintenance work.

1. Take it out(sensor) of the medium and dry it.

2. After 10 minutes, measure the oxygen saturation index in air.

Decide depending on the result: If the measured value is not 100 ±2 %SAT, you must maintain the sensor. Otherwise, double the length of time to the next inspection.

The following tasks are mandatory:

Effects on process and process control

‣ When carrying out any work on the system, take into account possible repercussions for process control or the process itself.

‣ For your own safety, only use genuine accessories. With genuine parts, the function, accuracy and reliability are also ensured after maintenance work.

The measurement can be corrupted by sensor fouling or malfunction due to the following, for example:

Deposit on the fluorescence cap

These result in longer response times and, under certain circumstances, a reduced slope.

For reliable measurement, the sensor must be cleaned at regular intervals. The frequency and intensity of the cleaning operation depend on the measuring medium.

NOTICE: Effects on process and process control

When carrying out any work on the system, take into account possible repercussions for process control or the process itself.

For your own safety, only use genuine accessories. With genuine parts, the function, accuracy and reliability are also ensured after maintenance work.

Maintenance cycles depend to a great extent on the operating conditions.

The following rule of thumb applies:

Constant conditions, e.g. power plant = long cycles (1/2 year)

Greatly varying conditions, e.g. daily CIP cleaning = short cycles (1 month or shorter)

The following method helps you determine the necessary intervals: