8. Technical data
Application Process transmitter Universally presettable transformer of current signals from
pressure, level, flow and temperature measurement with
signal monitoring and retransmission.
Operation and
system
construction
Measurement
principle
The connected analogue signals are digitalised and
transformed into engineering units.
Using the basic mathematics operators such as
addition/subtraction/ multiplication a further process value can
be calculated in addition to the two input values. Using digital
analogue convertors two analogue outputs proportional to the
process values are made available as either voltage or current
signals. These can be used for transmission to further
instrumentation or peripheral equipment.
Additionally an LC display and alarm set point relays round off
the system.
Measurement
system
Microcontroller controlled measurement system with LC
display, analogue in/outputs, alarm relays and loop power
supply including HART communication connections
Inputs Input type Current
Measurement range Current: 0 to 20 mA (-0.2 to 22.0 mA)
4to20mA(3.85to20.5mA);
max. Current: 50 mA (without damage)
Ri: 205 Ohm
Scale -19999 to +99999, 0 to 4 decimal points
Offset -19999 to +99999, 0 to 4 decimal points
Signal damping Low pass 1st level, Filter constant 0 to 99 s
Number max. 2
A/D-resolution 13 bit
Isolation voltage 375 V
AC/DC
between inputs
Linearisation Possible using max. 20 linearisation points per analogue inputs.
Integration time 40 ms for 2 channels
Output
Loop power supply
Output signal 17.0...19.7 V, 22 mA; U
max
27.3 V
Communication
resistance
The resistors required for HART
communication are installed.
Number max. 2
Galvanic isolation To all other current circuits
Analogue
Output signal 0/4...20 mA, 20...4/0 mA or 0...10 V, over range + 10 %
Voltage max. load: 20 mA
Current Resistance max. 500 Ohm
Signal source Input 1, Input 2, mathematics process values
Scale/zoom Presettable between 0 and 100% of the signal
Process transmitter
69
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