Transmitter Configuration - GE Masoneilan 12420 Instruction Manual & Safety Manual

7.2.

TRANSMITTER CONFIGURATION

Always perform or check instrument configuration before any calibration procedure. Configuration defines 12400 operating
mode, validates various features or sub-menus activation and impacts instrument internal diagnostics.
Check the following key features before initiating any calibration procedure:
♦ Measurement function: LEVEL or INTERFACE.
For special applications, it might be of interest to set the instrument in interface mode even for a level measurement. In this
case low specific gravity is set at 0.
♦ Mounting position of the instrument head versus displacer: LEFT or RIGHT.
An incorrect configuration causes calibration errors that my impact instrument operating and advanced diagnostics
capabilities.
♦ Loop current action: DIRECT or REVERSE.
This function both applies on AO_1 and AO_2 (main and second 4-20 mA output signals).
In case of failsafe signal use ([FAIL LOW] or [FAIL HIGH]), check that loop current variations are in line with
process and safety rules implemented into the Distributed Control System.
♦ See Appendixes A to G which describe operating and setting menus.
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