Endress+Hauser Waterpilot FMX21 - Page 57

Waterpilot FMX21 Commissioning
Endress+Hauser 57
1
2
A0018822
1 HART master, e.g. PLC (programmable logic controller)
2 Waterpilot FMX21
Adjustment of the Waterpilot for level measurement
1 Select the "Level" measuring mode via the "Measuring mode" parameter.
Menu path: Setup → Measuring mode
L
WARNING
Changing the measuring mode affects the span (URV)
This situation can result in product overflow.
‣
If the measuring mode is changed, the setting for the span (URV) must be checked in the "Setup"
operating menu and readjusted if necessary.
2 Select a pressure unit via the "Press. eng. unit" parameter, here "mbar" for example.
Menu path: Setup → Press. eng. unit
3 The sensor is unpressurized, perform a position adjustment →  40
4 Set the "Auto dens. corr." parameter to Sensor temperature.
Menu path: Expert → Application
5 Perform level adjustment (wet or dry)
6 Result: The measured value output by the Waterpilot corresponds to the level in the deep well corrected
by means of the density characteristic line of the water.
9.11.2 Automatic density compensation using an integrated Pt100
for calculation in a suitable HART master (e.g. PLC)
Example:
In this example, the FMX21 with an integrated Pt100 is connected via the common
communication bus to any temperature head transmitter with HART communication (e.g.
TMT182). The temperature and pressure signal are transmitted to the HART master (e.g.
PLC), where a corrected level value can be generated using a stored linearization table or
density function (of a chosen medium). A pressure signal and a temperature signal can
thus be generated with a chosen density function to compensate for a level.