MSA Senscient ELDS 1000 series, Operating Manual

Page: 99 / 184

Installation & Commissioning
Senscient ELDS™
Rev 15 99
GB
7) Verify 4-20mA Loop
SITE now displays the screen below, providing options for verifying the correct operation of the
4-20mA loop(s).
The 4-20mA loop verification options can be used as follows:

Force 4-20mA
Use the Up & Down arrows by the Forced Value box to adjust the current that is to be forced
out of the Receiver’s two 4-20mA outputs. Check that the current flowing through the 4-20mA
loops is correct by use of either a multi-meter, the current measured and displayed by the
control system, or the Loop1 Actual current loop read-back (Mod State 2 and higher).
NB: When using the Loop1 Actual current loop read-back feature, a ±0.5mA allowance needs
to be made for the cumulative tolerances that affect the Loop1 Actual reading. In the above
illustration a Forced Value of 4mA is reading back as 3.7mA, which is within the expected
range.
Having satisfactorily verified the 4-20mA loop operation, click
Continue
to proceed to the next
step.

Skip 4-20mA Verification
If you do not want to verify the 4-20mA output, or the 4-20mA loop is not connected at the time
of performing commissioning, click Skip Verify to proceed to the next step.