Setting Prism Wash Parameters - Vaisala PR-23 Series User Manual

PR-23 Series User Guide
7.5.2 Setting prism wash parameters
To set the prism wash parameters for a given sensor, first select the sensor, then select 5
CALIBRATION from the Main menu, and then 4 PRISM WASH. This menu contains the
alternatives (factory settings are given in parentheses):
Parameter
1 PRECONDITION TIME
2 WASH TIME
3 RECOVERY TIME
4 WASH INTERVAL
5 WASH CHECK MODE
6 HOLD DURING WASH
7 TEMP LIMIT ACTIVATION
8 TEMP LIMIT VALUE °C
9 EMPTY PIPE CHECK
0 MORE...
1 WASH nD LIMIT
2 WASH TOLERANCE TIME
The prism wash cycle: See
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 be initiated
only by using the manual wash or remote wash request.
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.
Wash check: The prism wash check monitors automatically that the wash really has an
effect on the prism. In the WASH CHECK STANDARD mode, prism wash is accepted if the
refractive index n either falls below wash n
D
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, see
message priorities (page
the message becomes PRISM WASH FAILURE. Both messages and the wash tolerance
counter are reset by a successful wash.
The WASH CHECK AUTOMATIC WASH CUT mode differs from the standard mode by
stopping the wash 2 s after the n
To stop the measurement for the duration of the prism wash, choose 6 HOLD DURING
WASH and in that menu activate the hold function. The CONC reading and mA outputare
held in the value they had immediately before starting the wash cycle.
82
Figure 43 (page 81)
limit (default 1.34) at Normal operation or NO
D
97), displays. If no wash is accepted during wash tolerance time,
falls below the limit.
D
Value
0 ... 30 s (0 s)
0 ... 30 s (3 s)
0 ... 30 s (20 s)
0 ... 1440 min (20 min)
(Disabled)
(Active)
(Active)
(0 min)
and Wash cycle (page
IM-EN-PR23-E
77). The timing of the
Diagnostic