Endress+Hauser Hart Cerabar PMP71B, Руководство по эксплуатации

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Electrical connection Cerabar PMP71B HART
28 Hauser
6.2.2 Terminals
• Supply voltage and internal ground terminal: 0.5 to 2.5 mm 2 (20 to 14 AWG)
• External ground terminal: 0.5 to 4 mm 2 (20 to 12 AWG)
6.2.3 Cable specification
• Protective ground or grounding of the cable shield: rated cross-section > 1 mm 2 (17
AWG)
Rated cross-section of 0.5 mm 2 (20 AWG) to 2.5 mm 2 (13 AWG)
• Cable outer diameter: Ø5 to 12 mm (0.2 to 0.47 in) depends on the cable gland used
(see the Technical Information)
6.2.4 4-20 mA HART
2
3
4
Y
+ +
- -
I
1
mA
A0028908
 2 Block diagram of HART connection
1 Measuring device with HART communication
2 HART communication resistor
3 Power supply
4 Manometer
The HART communication resistor of 250 Ω in the signal line is always necessary in
the case of a low-impedance power supply.
Take the voltage drop into consideration:
Maximum 6 V for a 250 Ω communication resistor
6.2.5 Overvoltage protection
Devices without optional overvoltage protection
Equipment from Hauser fulfills the requirements of the product standard IEC /
DIN EN 61326-1 (Table 2 Industrial Environment).
Depending on the type of port (DC power supply, input/output port) different testing levels
according to IEC / DIN EN 61326-1 against transient overvoltages (Surge) are applied
(IEC / DIN EN 61000-4-5 Surge):
Test level on DC power ports and input / output ports is 1000 V line to earth
Devices with optional overvoltage protection
• Spark-over voltage: min. 400 V DC
• Tested according to IEC / DIN EN 60079-14 sub chapter 12.3 (IEC / DIN EN 60060-1
chapter 7)
• Nominal discharge current: 10 kA
Overvoltage category
Overvoltage category II