Advanced Operations

SYSTEM SETUP OUTPUT SETUP mA OUTPUT INT/EXT

 

 

Default value: 0

 

PROPORTIONAL

Sets the proportional part of the PID controller (in minutes).

 

The proportional part of the controller generates an output signal which is linearly dependent to

 

 

the control deviation. This part responds directly to any changes at the input but starts to

 

 

oscillate easily if set to high. The proportional part cannot completely compensate disturbances.

 

 

 

 

 

Default value: 0

 

 

Sets the integration part of the PID controller (in minutes).

 

INTEGRAL

The integral part of the controller generates an output signal which increases linearly when the

 

control deviation is constant. The integral part responds slower than the proportional part but can

 

 

 

 

completely adjust to disturbances. The higher the integral part value is set, the slower it

 

 

responds. If the integral part is set to a low value, it can start to oscillate.

 

 

 

 

 

Default value: 0

 

 

Sets the derivative part of the PID controller (in minutes).

 

 

The derivative part of the PID controller gives an output signal. The faster the control deviation

 

DERIVATIVE

changes, the higher the output signal gets.

 

Control deviation changes=Output signal.

 

 

 

 

Control deviation does not change=No output signal.

 

 

If there is no knowledge about the controlled process behavior, it is recommended to set this part

 

 

to “0”, because this part tends to oscillate strongly.

 

 

 

 

SNAP SHOT

Displays the latest snap shot of the process value.

 

With the help of the output current the PID controller tries to approach the controlled process

 

 

 

 

value to the set point.

 

 

 

 

CURRENT

Displays the calculated output current (in mA).

 

By default the calculated output current does not represent the real output current. The real

 

 

 

 

current output depends on the opposite input resistance and can never exceed 22 mA.

 

 

 

 

 

Default value: OFF

 

LOG INTERVAL

Sets the interval (in minutes) for logging the displayed value into the data logger.

 

 

Options: OFF, 5min, 10min, 15min, 20min, 30min

 

 

 

VERSION

Displays the software version number.

 

 

LOCATION

Displays the current location.

 

 

 

80

Page 82
Image 82
Hach sc1000 user manual Proportional, Integral, Derivative, Snap Shot, LOG Interval, Version, Location