instruction manual for inline refractometer pr-03 - K-Patents

5 Startup, configuration and calibration adjustment 41
Minimum time
Maximum test
This parameter sets a limit to how often the Smart wash is allowed to start a wash, its
range is 0–1440 min.
When this parameter is zero, the Smart wash function is inactive.
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.
5.9.3 Preventing automatic wash
Note: The preconditioning and wash relays are not activated by automatic wash start under Low conc /
no sample as this indicates a clean prism in an empty process line, i.e. there is no need for washing the
prism.
Wash can be prevented when the process temperature is below a limit. The Wash stop function is used to
prevent steam wash when the process pipe is empty or when the process is stopped. To activate the wash
stop use the command sequence Calibrate / Parameters / Prism wash / Wash stop /
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 9.7.
Wash can also be prevented by an external contact closure, telling e.g. that the process pump has stopped.
See Section 5.6.
5.9.4 Prism wash check
The prism wash check is used for making sure that the wash really has an effect on the prism, i.e. that the
wash works correctly. A prism wash is accepted if one of the two conditions are satisfied:
1. TEST exceeds "TEST limit", i.e. the TEST value reaches the set limit during wash cycle
2. TEST increases more than "TEST difference", i.e. the TEST value increases during wash reaching
the value of normal TEST plus the given TEST difference.
The default values of "TEST limit" and "TEST difference" are zero, which makes the Wash check inactive.
If one of the conditions are set to zero, the other condition is valid alone.
Example: A typical case is "TEST limit" = 230, "TEST difference" = 0. The wash is accepted, if the
Test value exceeds 230 during wash, and the Test difference condition is invalid.