Yokogawa Pneumatic Retractables RF20H - Manual (Page 7)

IM 12B06K07-E-E
Figure 4: Program sequence
Cleaning I/1
Cleaning with 1. cleaning solution, e.g water.
„Cleaning I“ valve and drain valve are opened
and closed again after the preset time (10…300
seconds).
By opening the „Cleaning I“ valve, a delivery pump
can be triggered via an outlet trigger (no. 21 + 22).
Cleaning II
Cleaning with 2. cleaning solution, e.g. acid.
„Cleaning II“ valve and drain valve are opened
and closed again after the preset time (0…300
seconds). If this time is set to "0", this program step
is left out completely.
By opening the “Cleaning II” valve, a delivery pump
can be triggered via an outlet trigger (no. 23 + 24).
CLeaning II RT
Exposure time for 2. cleaning solution
Cleaning II RT is a reaction time for the 2. cleaning
solution and provided so that the cleaning acid,
which was put into the rinsing chamber, is able to
react, for example.
All cleaning valves and the drain valve stay closed.
After the preset time (0…300 seconds), the next
program step follows. If this time is set to “0”, this
program step is left out completely.
CLeaning I/2
Cleaning with 1. cleaning solution, e.g. water.
“Cleaning I” valve and drain valve are opened and
closed again after the preset time (0…300 seconds).
If this time is set to “0”, this program step is left out
completely.
By opening the “Cleaning I” valve, a delivery pump
can be triggered via an outlet trigger (no. 21 + 22).
Pause
If the sensor is not to be moved again into the
process directly after cleaning, the pause time is
activated.
This is particularly recommended if the measuring
medium is especially aggressive and therefore the
lifetime of the sensor is especially short. In this case,
short measuring intervals and long pause times can
minimize the dipping time of the sensor and thus
increase the lifetime.
The sensor remains in the rinsing chamber, all
cleaning valves and the drain valve remain closed.
After the preset time (0…999 minutes), the sensor
moves to the measurement position.
If the time is set to “0”, this program step is left out
completely.
Measure
Measuring interval at parameterization “loop” or
“loop + trigger”.
The sensor is moved to the measurement position
and stays there for the preset time (1…999
minutes). This time can be interrupted in case of
parameterization “loop + trigger” by an external
trigger. After this time has elapsed, the next
cleaning cycle begins.
Measure Clean I/1 Clean II Clean II/RT
Clean I/2 Pause Measure
Start
Loop / Event / Trigger
End
Trigger OFF
3.3 Cleaning program
As soon as a cleaning program is started (see 3.1),
the following functions are run one after the other: