wtw DIQ/S 181, Руководство по эксплуатации, Страница: 80 / 104

Outputs
DIQ/S 181
80
ba77083e01 02/2015
Characteristic curve You can specify the minimum and maximum pulse width (v). This
determines the steepness of the characteristic curve of the output.
In order to obtain a negative characteristic curve, a value for End value
must be entered that is smaller than the value for Start value .
6.4.7 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 181. 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 the 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.
Start value within the
measuring range
(sensor-
dependent) Minimum spacing:
5 % of the
measuring range
End value
Pulse width (v) min. 0 ... 100 % Minimum spacing:
10 % of the
Cycle
duration (T)
Pulse width (v) max.
Cycle duration (T) 5 ... 100 s Length of the
switching period T
T = (t
on
+ t
off
)
Error pulse width 0 ... 100 % In case of system
errors or sensor
errors (see
page 87), the relay
switches with the
pulse-width
specified.
Action Open
Close Relay action
Setting Selection/Values Explanation