YSI 58 User Manual
Page 13
3.
Grasp the probe in your left hand (or right for left-
handers). When preparing the YSI 5739 probe, the
pressure compensating vent should be to the right.
(A left-handed operator may choose to reverse
hands and vent direction.) Successively fill the
sensor body with electrolyte, then pump the
diaphragm with the eraser end of a pencil or with
some similar soft, blunt tool. Continue filling and
pumping until no more air bubbles appear. (With practice, you can hold the probe and pump
the diaphragm with one hand while simultaneously pouring electrolyte into the sensor body
with the other.)
2.
DRY MEMBRANE
Figure 5
3
4
5
6
7
8
Figure 6
4.
Secure a membrane between your left thumb and
the probe body. Always handle the membrane
with care, touching it only at the ends.
5.
With the thumb and forefinger of your right
hand, grasp the free end of the membrane. With
one continuous motion, gently stretch it up, over,
and down the other side of the sensor. The
membrane should conform to the face of the
sensor.
6.
Secure the end of the membrane under the
forefinger of your left hand.
7.
Roll the O-ring over the end of the probe, being
careful not to touch the membrane surface with
your fingers. There should be no wrinkles or
trapped air bubbles. Small wrinkles may be
removed by lightly tugging on the edges of the
membrane. If bubbles are present, remove the
membrane and repeat steps 3-8.
8.
Trim off any excess membrane with a sharp knife
or scissors. Rinse off any excess KCl solution,
but be careful not to get any water in the
connector.
9.
Shake off excess electrolyte and reinstall the sensor guard.
10.
A plastic bottle without a bottom is provided with the YSI Field probes for convenient
calibration and probe storage. Place a small piece of moist towel or sponge in the bottle and
insert the probe into the open end. This ensures 100% humidity for accurate calibration and
helps protect the probe against drying out in storage. The YSI 5905 and 5750 probes can be
stored in a BOD bottle containing about 1” of water.
YSI Incorporated
YSI 58 DO Meter
9