DDS EX
Explosion-Proof Transmitter and Controller Instruction Manual
73
4-20 mA Output Calibration
The 4-20 mA output can be
recalibrated in the field. A calibrated
digital meter with an input range of at
least 25 mA and a resolution of 1 μA is
recommended.
4-20 mA Output Calibration Procedure
1. Wire the DSS EX 4-20 mA output to a current loop that includes a power supply (internal or external
12 to 24 VDC), and the mA input on the digital meter. See page 20 for details.
2. Turn on all devices. Allow for a 15 to 30 minute warm-up.
3. Go to the Advanced Features menu, and navigate to the Analog Output Programming
(
AoutPr
)/Calibration (
Calib
) menu and press
Enter
..
4. The display will show
4 nmA
. The DSS EX mA output should now be close to 4 mA. Press
Enter
and the display will show
04.000
. Enter the actual value read by the digital mA meter and press
Enter
.
5. The display will show
20 nmA
. The DSS EX mA output should now be close to 20 mA. Press
Enter
and the display will show
20.000
. Enter the actual value read by the digital mA meter and press
Enter
.
6. The DSS EX will now calculate the calibration factors and store them.
7. Press Menu to exit and return to Run mode.
CAUTION!
If an uncalibrated meter or a meter with less resolution is used, the calibration of the
4-20 mA output could be adversely affected.
!
•
There is
no need to recalibrate
the 4-20 mA output
when first received from the factory.
•
The 4-20 mA outputs is
factory calibrated
prior to
shipment. The calibration equipment is traceable to
NIST standards.
