Hach LXV526.98.1011A Operaciones página 13

4.16 Configure the 4-20 mA analog outputs
If an analog output(s) in the analyzer is connected to an external device, select the channel
represented at the analog output and the measurement range.
1. Enable an analog output as follows:
a. Push menu, then select SETUP SYSTEM > CONFIGURE ANALYZER > SETUP OUTPUTS
> 4-20 mA SETUP > [select an output].
b. Select SELECT SOURCE > [analyzer name].
2. Select an option.
Note: Select SET PARAMETER first, then SET FUNCTION and then ACTIVATION.
Option
ACTIVATION
SELECT SOURCE NONE (default)—Sets the analog output to disabled. [analyzer name]—Sets the analog
SET PARAMETER Sets the channel represented at the analog output.
SET FUNCTION
SET TRANSFER
SET FILTER
SCALE 0mA/4mA
• LINEAR CONTROL function
Option
SET LOW VALUE
SET HIGH VALUE Sets the high measurement value that is represented as 20 mA at the analog output.
• PID CONTROL function
Option Description
SET MODE AUTO—The analog value (mA) is automatically controlled by the algorithm when the
analyzer uses proportional, integral and derivative inputs. MANUAL—The analog value
(mA) is controlled by the user. To change the value manually, change the % value in
MANUAL OUTPUT.
PHASE DIRECT—The analog value increases as the measurement value increases. REVERSE—
The analog value increases as the measurement value decreases.
SET SETPOINT Sets a measurement value as the setpoint value.
PROP BAND Sets a value for the difference between the measured value and the setpoint value.
Description
The ACTIVATION options change based on the SET FUNCTION setting. Refer to the
tables that follow to configure the analog output.
output to enabled.
Note: Do not select a channel that contains the symbol "~" (e.g., 4-~SAMPLE4).
Channels that contain the symbol "~" are not measured.
Sets the function of the analog output. Refer to the tables that follow for more
information. LINEAR CONTROL (default)—The analog output is linearly dependent on
the measurement value. PID CONTROL—The analog output operates as a PID
(Proportional, Integral, Derivative) controller. LOGARITHMIC—The analog output is
represented logarithmically within the measurement range. BILINEAR—The analog
output is represented as two linear segments within the measurement range.
Sets the value of the analog output when an error occurs if the ERROR HOLD MODE
setting is set to TRANSFER OUTPUTS (0 to 25 mA, default: 4 mA). Refer to
error hold mode on page 21.
Sets the amount of time for analog output averaging (0 to 999 seconds, default:
0 seconds). For example, if the value is set to 30 seconds, the value of the analog
outputs is updated every 30 seconds and the value is the average of the analog output
values during the previous 30 seconds.
Sets the analog output value range to 0–20 mA or 4–20 mA (default).
Description
Sets the low measurement value that is represented as 0 or 4 mA at the analog output.
Set the
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