70
MI instruction manual
Document/Revision No.
IM-EN-MI
/2.00
Effective: September 2, 2019
7.1.2 Setting prism wash parameters
To set prism wash parameters for a given refractometer, first select the Refractometer
app, then select Calibration and then Prism wash. This menu contains the alternatives
(factory settings are given in parentheses):
1. Precondition secs 0-60 s (0)
2. Recovery secs 0-120 s (20)
3. Wash secs 0-30 s (3)
4. Empty pipe check (enabled)
5. Wash check mode (disabled)
6. Wash verify delta nD limit 0.0-0.5 (0.0)
7. Wash inhibit temp enable (disabled)
8. Interval mins 0-1440 min (20)
9. Wash inhibit temp value 0-200 C (0)
10. Wash verify nD limit 1.15-1.80 (1.35)
11. Wash failure tolerance mins 0-1440 (0)
12. Measurement hold during wash (enabled)
13. Temperature hold during wash (disabled)
The prism wash cycle
: The timing of the wash cycle is controlled by the
WASH INTERVAL
,
PRECONDITION TIME
,
WASH TIME
and
RECOVERY TIME
settings. If the
WASH INTERVAL
is set to zero,
the wash can only be initiated by using the manual wash (
PRISM WASH
on Diagnostics
menu) or general input module configured for external wash.
If the
PRECONDITION TIME
is zero (or there is no relay configured for preconditioning), the
preconditioning phase is skipped. If the
WASH TIME
is zero (or there is no relay for wash),
the wash functionality is completely disabled.
The recommended wash times and wash medium pressures are given in the refrac-
tometer manual.
Wash check mode, standard
: The prism wash check monitors automatically that the
prism wash really has an effect on the prism. In the
WASH CHECK
mode, prism wash is
accepted if the refractive index n
D
either falls below wash verify n
D
limit (default 1.35)
at
NORMAL OPERATION
or
NO SAMPLE
occurs. This is the indication of a successful wash
with water or steam.If the wash is not accepted, the diagnostic message
PRISM WASH
WARNING
will appear. If no wash is accepted during wash tolerance time, the message
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