Safe-Drive
®
Process Refractometer PR-23-SD Best Practices, Generation 2
© Copyright K-Patents 2014. All rights reserved.
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4.6 Installing Steam Prism Wash System
In black liquor service material deposit, scaling or coating may occur on the prism surface.
To avoid this, you need to install an integral prism wash with steam that uses the retractable
nozzle included in the SDI2 valve.
Important Steam Prism Wash Considerations
●
The distance from the steam nozzle on the SDI2 valve to the steam shut-off valve
should be kept as short as possible to avoid condensate. The recommended length of
the distance is 0.6 m (2 ft) or less.
●
Separate or isolate the power to the solenoid from the power to the transmitter by
installing a safety switch. This enables the steam wash to be serviced without having
to power down the whole SD sensor system.
●
Pipe the steam trap properly to drain so that the trap is not blowing hot steam.
●
Steam piping upstream of shut-off valve is ½” or larger.
● In addition to the SDI2 valve steam fittings, the following components must be included
in the steam wash installation:
●
steam shut-off valve
●
air-operated solenoid valve
●
steam trap
●
switch or terminal for power isolation
For K-Patents recommendations, please see
K-Patents Steam Instructions
.
●
OPTIONAL, in case of contaminants: To remove any contaminants within the
steam source, installing a steam strainer is recommended. See K-Patents list of
recommended accessories.
