K-Patents PR-01-S - Manual (Page 64)

INSTRUCTION MANUAL FOR K-PATENTS PR-01-S (-AX/FM/CS) DOCUMENT/REVISION No. INM 1/14
Effective: May 15, 2009
62
d
SUPPORT RING
PRISM
KALREZ GASKET
SENSOR BODY
Figure 6.71 Mounting of Kalrez gaskets.
3. Always use new gaskets. Clean the gaskets with cleansing spray. Mount the Kalrez gaskets and put
the prism in place. Slide the prism lightly in the groove in both directions (± 1 mm). This helps the
gaskets to settle in the right position.
4. Put prism holders and screws in place. The teflon or compression pads should be carefully fitted
between the prism and the prism holders. No part of the compression pads should be between the
prism holder and the refractometer body. Tighten the screws alternatingly in small steps. Trim excess
teflon with a razor blade.
5. Tighten the screws with torque wrench to 10 Newton meters. Note. For the special wetted parts
materials, such as Hastelloy C 276, Titanium and SAF 2205, the torque is 5 Newton meters.
6. Inspect the gasket contact surfaces through the prism. They should form regular concentric rings
around both holes (Figure 6.72). The rings should have the same size.
7. If the contact surfaces do not look good loosen the screws and start again from the beginning.
PRISM
GASKETS
Figure 6.72 Kalrez gaskets seen through the prism