Calibrating The 4-20 Ma Output - Sigma 980 Operating And Maintenance Manual

Section 4
4.1.2 Calibrating the 4–20 mA Output
Page 68
4–20 mA Output
5. Select an Input Channel (e.g., channel 1, 2, 3, or, flow, etc.) to assign to
that output. Press the
channel names. When the desired channel is displayed, press the
soft key to pick that channel.
ACCEPT
11:00 AM 21 - APR - 01
ACCEPT
INPUT CHANNEL:
CANCEL
SELECT APPROPRIATE UNITS
6. Assign a channel value to the 4 mA current value. This value is typically 0,
however any value can be set. In other words, enter the value of the input
needed to generate 4 mA of current at the output.
11:00 AM 21 - APR - 01
ACCEPT
4 mA INPUT VALUE
CLEAR
ENTRY
SELECT APPROPRIATE UNITS
7. Assign an input value to the 20 mA current level.
8. Repeat this process to configure the other 4–20 mA output.
After wiring the 4–20 mA connection perform a 4–20 mA output calibration.
The 4–20 mA output calibration requires a multimeter and an interface or
access to the 4–20 mA current loop wiring. Two 4–20 mA outputs are
available and are designated Output A and Output B. Both outputs are
calibrated the same way and are isolated from each other.
Calibration may be performed while the 4–20 mA device is in the current loop,
as shown in Figure 28 or disconnected from the current loop as shown in
Figure 29. In either case, the multimeter must be set to a 20 milliamp dc range
or greater.
1. From the Main Menu, select
CALIBRATION > 4–20 mA OUTPUTS.
2. Connect a multimeter to the 4–20 mA current outputs per
Figure 29.
3. Make sure that the 4–20 mA output is enabled. If it is not enabled, press
the
CHANGE CHOICE
press the soft key.
ACCEPT
4. Select the output (A or B) to calibrate.
5. Press any key to set the selected output to 4.00 mA dc.
soft key to cycle through the
CHANGE CHOICE
FLOW
0.00 mgd
OPTIONS > ADVANCED OPTIONS >
soft key so that the display shows ENABLED and
4–20 mA OUTPUTS
CHANGE
CHOICE
4–20 mA OUTPUTS
CANCEL
Figure 28 or