Martek MARK 22 Operation Manual page 39

MAINTENANCE & TROUBLESHOOTING - 6
into the Mark 22. Also make sure that the
cell being used is clean and has no air
bubbles in it when the sample passes
through it.
5. pH readings are erratic and "noisy"
when pH sensor is installed in adaptor
p l u g .
ANSWER: Check to see that the flow to
the chamber is very close to 50 ml/min.
Higher flow rates could create a stream-
ing affect that can cause pH values to fluc-
tuate. Carbon dioxide may also affect pH
readings. Make sure that the plug is prop-
erly grounded.
Martek Instruments, Inc. 35