3 ELECTRICAL CONNECTIONS
Manual ERZ2000-DI · EN1.2 · 2017, December 21st
85
Up to 5 analogue inputs, including a pressure measurement input for analog
signals and for HARD protocol
Current measurement
Range
0/4 to 25 mA
Resolution
20 bit
U max
2.5 V
Ri
250 Ω
Tk
< 15 ppm
Measuring time
50 ms
Overvoltage protection
6.8 V
Calibration of current inputs takes place at the factory, but correction can take
place with the adjustment of the input variables pressure, temperature, etc.
HART protocol connection SMART transmitter (optional)
Two-wire system
Communication
Simultaneously analog and digital
Protocol
HART master
Inputs
3 (optionally 6)
With EX isolation card
(optional)
+ 2 inputs
Distribution of inputs
1 x pressure (reserved)
1 x temperature (reserved)
Remainder -> Free availability
Up to 2 resistor inputs, a temperature measuring input for resistance meas-
urement
Resistance measurement
Type
PT 100 four-wire
Range
-20°C to +60°C
Resolution
0.01°C
Accuracy
0.05°C
Measuring time
50 ms
8 signal inputs for H/L gas switching, travel direction reversal and external
freeze
