User Manual

13
Symptoms Actions
Does not hold
calibration
• Allow sufficient time for temperature and
oxygen stabilization before calibration
• Check for water droplets on membrane
• Check membrane for a pinhole or split
• Change membrane
• Clean probe (see instructions under
Electrode Cleaning)
Unstable readings • Check membrane for a pinhole or split
• Allow 60 sec. for reading to stabilize
• Change membrane
• Clean probe (see instructions under
Electrode Cleaning)
Membrane cap is
tight
• Use pliers to loosen the cap (turn counter
clockwise while facing sensor tip)
S
ERVICING
The 5239 probe has only two replaceable parts (other than the
membrane cap), the probe guard and the 5-pin MS connector
on the end of the cable. The cable is permanently attached to
the probe and cannot be replaced.
YSI part number Description
110275 5-pin MS connector kit
059956 Probe guard
5238 Probe reconditioning kit