K-Patents PR-01-S - Manual (Page 78)

INSTRUCTION MANUAL FOR K-PATENTS PR-01-S (-AX/FM/CS) DOCUMENT/REVISION No. INM 1/14
Effective: May 15, 2009
76
8.3. PRISM WASH WITH INTEGRAL HIGH PRESSURE WATER NOZZLE
Integral high pressure water prism wash is recommended to be used in applications where conventional
wash (Section 8.2) is insufficient to remove coating. It can be used e.g. in the measurement of starch, beer
worth, green liquor in the wood pulp industry or directly after the evaporation in the sugar industry.
The Figure 8.30 describes the recommended components for a prism wash system with integral high
pressure water nozzle. The components can be supplied by K-Patents.
Note the following items in the high pressure wash system:
- Integral water wash nozzle (HPN) is built on a sensor which has a Sandvik clamp or a flange
connection.
- For mounting a flow cell see Section 8.4.
- Check valve is included
- It is recommended to mount a filter for the water inlet before the high pressure pump.
Recommended filter size is 0.15 mm and recommended flow rate above 10 liter/minute.
- The high pressure pump should be able to keep a pressure of 100 bar for a 1.25 mm (0.05 in)
diameter nozzle.
- For recommended wash pressures and times, see Section 8.5.
High
pressure
pump Use K-Patents PR-3602-SP high pressure pump. K-Patents recommends to use 3~ pumps
with local voltages. Inlet water temperature should be warm, about 60 °C. K-Patents delivers
high pressure pump with 8 meter rubber high pressure hose. Customer can also make high
pressure line between pump and nozzle from stainless steel pipes which are suitable for
pressures up to 150 bar. With stainless steel pipes K-Patents recommends to use heat trace
and insulation to keep washing water warm (60-70°C).
Warning! Pressure increase can occur in a closed pipe section when the high pressure pump is
operated. K-Patents recommends to mount a pressure relief valve in the pipe section.
Relief pressure should be according to pipe pressure rating.
The Wash control relay unit -WR is used to drive the Power relay unit PR-3603. The Power relay unit
drives the high-pressure pump and the water valve. Pump relay has an overload relay which will switch off
the pump if current goes over the set limit. The configuration of the Relay unit is made from the Indicating
transmitter keyboard, see Section 9.2. For the wiring of the high-pressure components, see Figure 8.31.