Page 6
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Installation and Technical Manual Rev: H10
A – 6: Sensor Preparations
NOTE: As soon as you install the sensors,
immediately move on to the next step to insure that
they always stay wet.
A – 6.1: Sensors
The pH and ORP (if included) sensors are shipped
with a wetting cap covering the measuring end.
This cap contains a solution of pH 4 buffer
saturated with potassium chloride (KCl). Gently
remove the wetting cap by unscrewing the sensor
and sliding the cap off of the sensor body.
It is a good idea to save the wetting cap and
the box that the sensor came in for future
long-term storage.
During shipping, the air space inside the pH glass
may have moved into the bulb. Grasp the sensor
near the cable end and gently swing it through an
arc to force the internal electrolyte into the pH
bulb. Rinse the measuring ends of potentiometric
sensors with de-ionized or distilled water before
installation into a flow cell.
A – 7: Opening the Sample Stream Valve
Open the sample stream valve and check for leaks.
Note the reading on the compound pressure gauge
and make sure that it shows a positive and steady
pressure. The sample stream should be about 2-20
psi at the flow cell. If this is not the case, then adjust
the valves or relocate the point at which the sample
stream is connected to the recirculation system.
Negative pressure will destroy the sensors. Once
you have a positive and steady pressure, open the wet
test valve and make sure that it generates a vigorous
stream.
A – 8: Plugging in the Sensors
Remove the protective covers from the BNCs. Plug
the pH sensor into the coded BNC jack and the
ORP (if included) sensor into the coded BNC jack
on the bottom of the BECSys3 controller by twisting
them a quarter of a turn. Allow the sensors to rinse
in the sample water while you do the wiring (Section
B).
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