Hach-Lange HACH 5500 sc SiO2 Operations - Manual (Page 12)

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.
5. Select SET FUNCTION>LOGARITHMIC and then select the
applicable options in the ACTIVATION menu.
Option Description
SET 50% VALUE Sets the value corresponding to 50% of the process
variable range.
SET HIGH VALUE Sets the high endpoint (upper value) of the process
variable range.
6. Select SET FUNCTION>BILINEAR 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.
SET KNEE POINT
VALUE Sets the value at which the process variable
range divides into another linear segment.
SET KNEE POINT
CURRENT Sets the value of the current at the knee point
value.
Relay setup
1. Select SETUP SYSTEM>SETUP OUTPUTS>RELAY SETUP.
2. Select the relay.
3. Select an option.
Option Description
ACTIVATION The menu list items change with the selected function.
Refer to
Relay activation options on page 13 for more
information.
SELECT
SOURCE Selects the output. Options: None (if the relay is not
configured), the analyzer name or calculation (if a
calculation formula has been configured). Refer to
Set
up the calculation on page 11.
12 English