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2. Design and function
2.3 Sensor monitoring
The integrated monitoring is used for the electrical signal transmission of the sensor
status. If the sensor breaks, the pressure in the evacuated chamber between the support
tube and the sensor tube changes. On a deviation of 100 mbar, a first electrical or digital
warning signal is issued. On a deviation of 300 mbar, another electrical alarm signal
follows.
Version with HART
The instrument can communicate with a controller (master). Both the measured values of
the process and the alarm status are transmitted.
Version with current loop (4 ... 20 mA analogue signal)
If the sensor breaks, the instrument 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.
Display and operating unit
The display and operating unit features a main display and an additional display. The
settings for the main and the additional display are versatile. In the factory setting, the
main display shows the pressure value of the output signal and the additional display
shows the temperature at the sensor tube.
The process transmitter can be configured via the display and operating unit.
Adaptable to mounting position
The process transmitter is fitted with a case head which can be turned through 330°.
Rotatable case head
330°
The display and operating unit can be attached in 90° steps. Thus the measured values
can be read irrespective of the mounting position.
WIKA operating instructions, model DMSU22SA
(4 ... 20 mA with HART
®
signal)
EN
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