Hach-Lange HACH 5500 sc PO43-HR Operations - Manual (Page 11)

Configure the outputs
4–20 mA module setup
1. Select SETUP SYSTEM>SETUP OUTPUTS>4–20mA SETUP.
2. Select the OUTPUT.
3. Select an option.
Option Description
ACTIVATION The menu list items change with the selected function.
Refer to
4–20 mA activation options on page 11 for
more information.
SELECT
SOURCE Select the output. Options: None if the output is not
configured, the analyzer name or calculation if a
calculation formula has been configured. Refer to
Set up
the calculation on page 10.
SET
PARAMETER Select the measurement channel from the list.
SET FUNCTION Select a function. Further options will vary depending on
which function is chosen. LINEAR CONTROL—Signal is
linearly dependent on the process value. PID
CONTROL—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.
SET TRANSFER If TRANSFER is or will be selected as the ERROR
HOLD MODE, select SET TRANSFER and enter the
transfer value. Range: 3.0 to 23.0 mA (default = 4.000).
Refer to
Set the error hold mode on page 14.
SET FILTER Enter the filter value. This is a time-average filter value
of 0 to 120 seconds (default = 0).
SCALE 0mA/4mA Select the scale (0–20 mA or 4–20 mA).
4–20 mA activation options
1. Select SETUP SYSTEM>SETUP OUTPUTS>4–20mA SETUP.
2. Select the applicable OUTPUT.
3. Select SET FUNCTION>LINEAR CONTROL and then select the
applicable options in the ACTIVATION menu.
Option Description
SET LOW VALUE Sets the low endpoint of the process variable range.
SET HIGH VALUE Sets the high endpoint (upper value) of the process
variable range.
4. Select SET FUNCTION>PID CONTROL and then select the
applicable options in the ACTIVATION menu.
Option Description
SET MODE AUTO—the signal is automatically controlled by the
algorithm when the analyzer uses proportional, integral
and derivative inputs.
MANUAL—the signal is controlled by the user. To change
the signal manually, change the % value in MANUAL
OUTPUT.
PHASE Selects the signal result when process changes occur.
DIRECT—signal increases as the process increases.
REVERSE—signal increases as the process decreases.
SET SETPOINT Sets the value for a control point in the process.
PROP BAND Sets the value for the difference between the measured
signal and the necessary setpoint.
INTEGRAL Sets the period of time from the reagent injection point to
the contact with the measuring device.
DERIVATIVE Sets a value that adjusts for vacillation of the process. The
majority of applications can be controlled without the use
of the derivative setting.
TRANSIT TIME Sets the value to stop the PID control for a selected period
of time when the sample moves from the control pump to
the measurement sensor.
English 11