Endress+Hauser Micropilot FMR67B - Housing and Display Adjustments

Micropilot FMR67B HART Electrical connection
Endress+Hauser 21
11.2.3 4 to 20 mA HART
2
3
4
Y
+ +
- -
I
1
mA
A0028908
 5 Block diagram of HART connection
1 Device with HART communication
2 HART communication resistor
3 Power supply
4 Multimeter or ammeter
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
11.2.4 Overvoltage protection
The overvoltage protection can optionally be ordered as a "Mounted accessory" via the product
structure
Devices without optional overvoltage protection
Equipment from Endress+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 1 000 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