Author Question: While checking a polarographic (Clark) electrode, you determine that the device fails to read 100 ... (Read 40 times)

vicky · **on:** Jul 16, 2018

While checking a polarographic (Clark) electrode, you determine that the device fails to read 100 when exposed to pure O2. Which of the following actions would be the proper first step?

a. Check the silica crystals.
b. Send the device out for repair.
c. Replace the analyzer's batteries.
d. Change the analyzer's fuel cell.

Question 2

During calibration of a Clark polarographic O2 analyzer, you cannot get the sensor to read 100 when exposed to 100 O2, even after adjusting its calibration control. The unit has new batteries.

Which of the following actions would be correct?
a. Use it only with low FiO2 values.
b. Send the device out for repair.
c. Replace the unit's batteries.
d. Change the sensor or electrode.

jliusyl · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: C
Because a low battery condition is so common with Clark electrode systems, the first step in troubleshooting is to replace the batteries.

Answer to Question 2

ANS: D
If the analyzer still does not calibrate on fresh batteries, the problem is probably a depleted sen-sor. With most analyzers, a depleted sensor must be replaced (some Clark electrodes can be re-charged).