YSI 556 MPS - Manual (Page 28)

Probe Module Section 3
YSI 556 MPS YSI Incorporated Page 22
O-Rings Sensor nut
Figure 3.4 O-ring Lubrication
CAUTION: Make sure that there are NO contaminants between the o-ring
and the sensor. Contaminants that are present under the o-ring may cause
the o-ring to leak.
5. Be sure the probe module sensor port is free of moisture and
then insert the sensor into the correct port. Gently rotate the
sensor until the two connectors align.
6. With the connectors aligned, screw down the sensor nut using
the sensor installation tool.
Figure 3.5 Sensor Installation
CAUTION: Do not cross thread the sensor nut. Tighten the nut until it is
flush with the face of the probe module bulkhead. Do not over tighten.
Figure 3.6 Bulkhead Seating
7. Repeat steps 3-6 for any other sensors.