K-Patents PR-01-S - Manual (Page 74)

INSTRUCTION MANUAL FOR K-PATENTS PR-01-S (-AX/FM/CS) DOCUMENT/REVISION No. INM 1/14
Effective: May 15, 2009
72
8.2. PRISM WASH WITH INTEGRAL STEAM NOZZLE
Prism wash with integral steam nozzle is for use in applications where steam can remove coating from pipe
lines. For other applications see Sections 8.3 and 8.4. The integral nozzle is mounted on the sensor head
(Figure 8.21).
Integral steam nozzle (HPS) can be equipped for a standard length sensor or a long probe sensor with
standard insertion length (LPS) and with the following process connections:
– Sandvik L-clamp, 80 mm
– ANSI-flange 150 lbs
– DIN flange 2556, PN25, DN 80
– JIS flange, 10 K 80A
The earlier mentioned sensors are equipped with an integral nozzle connection (HPY) as a standard. An
integral steam nozzle can be easily fitted afterwards, if required.
The Figures 8.22 and 8.24 show recommended components for a prism wash system with integral steam
nozzle. In Figure 8.22 the Relay unit PR-7080 is used for connections. In Figure 8.24 the Wash control
relay unit -WR is used for connections, see Chapter 9 for Relay units. The components are provided by
K-Patents. The steam line should be equipped with a check valve (Figures 8.22 and 8.24). If the process
medium solidifies at ambient temperature, the check valve should be insulated (Figure 3.10). A condensate
trap should be used to keep the steam line hot (Figures 8.22 and 8.24).
The Relay unit (Chapter 9) is used to drive the wash valves, see Figures 8.23 and 8.25. Configuration of
the Relay unit is made from Indicating transmitter keyboard, see Section 9.2.
Alternatively, an external timer can be used. The timer should be equipped with extra contact which is kept
closed during prism washes. To lock the output signal (see Section 2.8), connect the extra contact to a
switch input in the Indicating transmitter (Figure 3.64).
Note. Do not connect the extra contact to external voltage.
For recommended wash pressures and times see Section 8.5.
Note. In Intrinsically Safe system solenoid valves are mounted in the safe area and the pneumatic
valves in hazardous area.