WIKA DMSU21SA Mode D'emploi page 8

2. Design and function
Diaphragm monitoring
The monitoring element is used for electrical signal transmission of the diaphragm
condition. In addition, the diaphragm condition is displayed on a dial with red/green areas.
In the event of a diaphragm rupture, the pressure monitored in the intermediate space
EN
increases. As soon as the display of the monitoring element exceeds the predefined set
point, an optical and electrical/digital alarm signal will be output.
Display of monitoring element
Diaphragm intact
Version with HART
The diaphragm monitoring system can communicate with a controller (master). Both the
measured values of the process and the diaphragm status are transmitted.
Version with current loop (4 ... 20 mA analogue signal)
In the event of a diaphragm rupture, the diaphragm monitoring system transmits the
measured values via the current loop or the analogue error signal.
→ See chapter 10.8 "Alarm status of diaphragm monitoring" for signal processing within
the process transmitter
Measuring range scaling (turndown)
The start and end of the measuring range can be set within defined ranges.
8

(4 ... 20 mA with HART
Diaphragm rupture
®
signal)
WIKA operating instructions, model DMSU21A