YSI Pro-BOD - Manual (Page 7)

5
Warm Up
Every time the instrument is turned on, the 5905/5010/200-
BOD/Pro-BOD Probe must be allowed to warm up for about 10-
20 minutes before taking the first reading. This allows the probe
to use up all the oxygen retained in the cap.
---IMPORTANT---
New Probe Break In (motor off)
For best results, please allow the probe more than the usual 20
minutes to warm up after the first membrane is installed. The
process may be faster if the probe is allowed to warm up in a
BOD bottle filled with clean water. If possible, it’s a good idea to
let new probes warm up overnight (with a new membrane and
KCl) prior to first use.
Electrode Cleaning
The 5905/5010/200-BOD/Pro-BOD should be cleaned only when
erratic readings occur or after about every 500 hours of use (two
months). Each cleaning removes material and reduces the life of
the probe, so excessive cleaning should be avoided.
Gold Cathode
For correct probe operation, the gold cathode must be textured
properly (for its location, see figure 2). It can become tarnished
or plated with silver after extended use. The gold cathode can be
cleaned by using the sanding disc provided in the 5906 and 5908
Membrane Kits. Place the disc in the palm of your hand, then
sand the gold with a twisting motion about 3 times or until all
silver deposits are removed and the gold appears to have a matte
finish. If the cathode remains tarnished, return the probe for
service.