K-Patents PR-01-S - Manual (Page 88)

INSTRUCTION MANUAL FOR K-PATENTS PR-01-S (-AX/FM/CS) DOCUMENT/REVISION No. INM 1/14
Effective: May 15, 2009
86
Wash stop
Wash stop function can be defined from the prism wash menu. Wash can be prevented when the process
temperature is below the limit or when the process is stopped. To activate the “wash stop” key sequence
Calibrate/Parameters/1. Prism wash/Wash stop/1. Activate and set the temperature limit.
The default value for wash stop is inactive. When the wash is not accepted the diagnostics message is
“Wash stop/temp. limit”, see Section 6.3.
9.3. COMPATIBILITY
– The Relay unit PR-7080 can not be used with models preceding PR-01-S, see Section 2.9.
– The Wash control relay unit -WR requires a Program version 6.0 or higher.
9.4. WASH LOGICS AND SMART WASH
Figure 9.21 describes the standard prism wash sequence Preconditioning/Wash/Recovery/Interval. In some
cases the wash routine should be modified to better fit the application. The Wash decision logics (Figure
9.41) of K-Patents refractometer covers a wide range of options.
AUTOMATIC WASH START:
1. The wash interval timer starts a wash at a preset interval after last wash, independently of how the last
wash was initiated. If the wash interval is set to zero, the timer will not initiate a wash. How to set the
wash times is described in Section 9.2.
2. The Smart wash starts the wash when the prism shows signs of being coated. An early indicator of
beginning coating is that the Slope decreases. Slope is a measure of the sharpness of the optical image,
Section 6.5. The settings are made at Calibrate/Parameters/Prism Wash/C Smart wash:
− Slope limit:
A wash is initiated when the Slope value goes below this limit. The Slope limit has to be set based
on observations of slope values both at clean prism and at slight coating. When the slope limit is
set to zero, this Smart wash function is inactive.
− Minimum time, 0...1440 min:
This parameter sets a limit to how often the Smart wash is allowed to start a wash. When this
parameter is zero, the Smart wash function is inactive.
− Maximum Test:
This parameter should normally be set to zero. Then it will not influence the Smart wash function.
It may be used for fine-tuning: The Smart wash will initiate Wash only if the Test value is below
Maximum Test.