Ashcroft GC52 - Rangeable wet/wet Differential Pressure Transmitter - Manual (Page 34)

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Check
Terminals
14.5 Loop Check
In each display mode, regardless of applied pressure, the loop check can
be changed by arbitrarily linking the display with the analog output using
the key operation. The display will show representative pressure readings
correlating to the 4-20mA signal.
Ⅲ Loop check method
(1) Remove the lid of this product.
(2) Shift to either the differential pressure, linear display or flow
measurement modes. (See Section 14). Use (M) button to scroll to
Loop Check function as indicated within Section 14.1, 14.2 or 14.3 re-
spectively. The display and output (4mA) are at the zero point when
loop check starts.
(3) If the T is pressed, the display will increase along with the
output. By pressing S key, decrease will occur. Release the
key at the desired indication. For example, if the key is released at
25.0m, the display will stop and be held at analog output 12mA cor-
responding to the indication, ref. example from section 14.2
Ⅲ Analog Output Check Terminals
When the front cover is removed, the analog output check terminals
(pad: CH+, CH–) are visible at the upper part of the display substrate.
The analog output can be checked during measurement mode or loop
check by applying a probe, such as a tester for current measurement,
onto the check terminal of the substrate, as shown in the following figure.
In addition, receivers are not affected by the tester's probes.
Loop check / linear display