YSI DIQ/S 182 XT-4-PR - Manual (Page 111)

System 182 XT-4 Relay outputs
6 - 21 ba76027e01 02/2012
6.4.8 Cleaning
Function The Cleaning function enables the time controlled automatic start of the
sensor cleaning function with the aid of a relay of the DIQ/S 182 XT-4-
PR. The relay controls the DIQ/CHV valve module and switches the
compressed air for the CH sensor cleaning head on or off.
In order to set up the Cleaning function for a relay output, the relay
output must be linked with a sensor (see section 6.2.1).
The assigned relay always works as a closer.
The cleaning cycle consists of Cleaning duration and Adjustment time.
During the cleaning cycle the Clean display flashes. The outputs linked
with this sensor are frozen. The maintenance condition is active.
After the Cleaning duration, the relay is opened. During the following
Adjustment time the outputs remain blocked.
The outputs linked with this sensor are only released when the cleaning
cycle is complete. The Clean display disappears. The maintenance
condition is finished.
Testing the
operativeness
The operativeness of the cleaning system can be tested as follows:
manually open or close the relay with the Manual control function (see
section 6.4.9) and, while doing so, check the behavior of the cleaning
system.
Alternatively, the operativeness of the cleaning system can be tested
by checking the performance of the function at the programmed start
time (reference time ± interval). To perform a test immediately, the
reference time can be set so that the next cleaning cycle will start in a
few minutes (settings: see following table).