Hach sc200 User Manual page 24

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 Description
Set low value Sets the low endpoint of the process variable range
Set high value Sets the high endpoint of the process variable range
• PID
22 English
Option Description
Set mode (Auto Auto—the signal is automatically controlled by the algorithm
or Manual) within the analyzer using proportional, integral, and
derivative inputs.
Manual—the signal is controlled by the user through
manual adjustment of the % change value identified in the
menu as Manual Output.
Phase (Direct The direction in which the signal responds to process
or Reverse) change.
Direct—signal increases as the process increases.
Reverse—signal increases as process decreases.
Set setpoint Creates a desired control point of process
Prop band A function of the difference between the measured signal
and the desired setpoint.
Integral The period of time from the injection point of a reagent to
contact with the measuring device.
Derivative Used to compensate for the 2
The majority of applications can be controlled without the
use of the derivative setting.
Transit time Stops all PID control for a selected period of time as the
sample travels from the control pump to the measurement
sensor.
• Logarithmic
Option Description
Set 50% value Sets the value corresponding to 50% of the process variable
range.
Set high value Sets the upper value of the process varible range
• Bilinear
nd
order effects of the process.