Setting Prism Wash Parameters - Vaisala K-PATENTS PR-23 Series Instruction Manual

6 Configuration and calibration

6.5.2 Setting prism wash parameters

To set the prism wash parameters for a given sensor, first select the sensor, then select
from the Main menu, and then
5 CALIBRATION
alternatives (factory settings are given in parentheses):
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 Figure 6.16 and Section 6.5.1. The timing of the wash cycle
is controlled by the
WASH INTERVAL
settings. If the
WASH INTERVAL
the manual wash or remote wash request.
If the
PRECONDITION TIME
the preconditioning phase is skipped. If the
wash), the wash functionality is completely disabled.
The recommended wash times and wash medium pressures are given in Section 4.2.1,
"Recommended wash pressures and times".
Wash check: The prism wash check monitors automatically that the wash really has
an effect on the prism. In the
the refractive index n either falls below wash nD limit (default 1.34) at
D
ATION 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
tion 8.4) will appear. If no wash is accepted during wash tolerance time, the message
becomes PRISM WASH FAILURE
set by a successful wash.
The
WASH CHECK AUTOMATIC WASH CUT
ping the wash 2 seconds after the n
To stop the measurement for the duration of the prism wash, choose
and in that menu activate the hold function. The CONC reading and mA
ING WASH
output are held in the value they had immediately before starting the wash cycle.
To activate (or deactivate) a temperature limit, choose
and then the appropriate command in the menu.
4 PRISM WASH
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)
,
PRECONDITION TIME
is set to zero, the wash can be initiated only by using
is zero (or there is no relay configured for preconditioning),
WASH TIME
WASH CHECK STANDARD
. Both messages and the wash tolerance counter are re-
mode differs from the standard mode by stop-
falls below the limit.
D
. This menu contains the
, and
WASH TIME RECOVERY TIME
is zero (or there is no relay for
mode, prism wash is accepted if
NORMAL OPER-
PRISM WASH WARNING (see Sec-
6 HOLD DUR-
7 TEMP LIMIT ACTIVATION
59