Hach sc200 User Manual page 30

4. Choose Select Source and select a source from the list. Typically the source is one of the
sensors attached to the system. If an analog input card is installed, the analog input may be used
as a source.
5. From the Output Setup menu, choose Select Parameter and choose an option from the list.
Parameters will vary depending on the type of sensors installed.
6. From the Output Setup menu, select Set Function and choose a function. Further setup options
will vary depending on which function is chosen.
Option Description
Linear Signal is linearly dependent on the process value
PID Signal works as a PID (Proportional, Integral, Derivative) controller
Logarithmic Signal is represented logarithmically within the process variable range
Bilinear Signal is represented as two linear segments within the process variable range
7. From the Output Setup menu, select Activation. Use the information in the table below the chosen
function to configure the options.
8. If Transfer is or will be selected as the Error Hold Mode, or if the Transfer will be used during
calibration or other functions within the sensor menu, select Set Transfer from the Output Setup
menu and enter the transfer value.
9. From the Output Setup menu, select Set Filter and enter the filter value.
10. From the Output Setup menu, select Scale and choose the scale (0-20 mA or 4-20 mA).
• Linear
Option
Set low value
Set high value
• PID
Option
Set mode (Auto or
Manual)
Phase (Direct or
Reverse)
Set setpoint
Prop band
Integral
Derivative
Transit time
28 English
Description
Sets the low endpoint of the process variable range
Sets the high endpoint of the process variable range
Description
Auto—the signal is automatically controlled by the algorithm within the analyzer using
proportional, integral, and derivative inputs.
Manual—the signal is controlled by the user through manual adjustment of the %
change value. This option is shown as Manual Output after the manual set mode is
selected.
The direction in which the signal responds to process change.
Direct—signal increases as the process increases.
Reverse—signal increases as process decreases.
Creates a desired control point of process
A function of the difference between the measured signal and the desired setpoint.
The period of time from the injection point of a reagent to contact with the measuring
device.
Used to compensate for the 2
applications can be controlled without the use of the derivative setting.
Stops all PID control for a selected period of time as the sample travels from the
control pump to the measurement sensor.
nd
order effects of the process. The majority of