Endress+Hauser Micropilot FMR50, Operating Instructions Manual

Page: 44 / 184

Electrical connection Micropilot FMR51, FMR52 HART
44 Hauser
4-wire, 4-20mA HART, active
"Power supply; Output"
1)
Terminal voltage Maximum load
R
max
K: 4-wire 90-253VAC; 4-20mA HART 90 to 253 V
AC
(50 to 60 Hz),
overvoltage category II
500 Ω
L: 4-wire 10,4-48VDC; 4-20mA HART 10.4 to 48 V
DC
1) Feature 020 of the product structure
7.1.5 Overvoltage protection
If the measuring device is used for level measurement in flammable liquids which requires
the use of overvoltage protection according to DIN EN 60079-14, standard for
test procedures 60060-1 (10 kA, pulse 8/20 μs), overvoltage protection has to be ensured
by an integrated or external overvoltage protection module.
Integrated overvoltage protection
An integrated overvoltage protection module is available for 2-wire HART as well as
PROFIBUS PA and FOUNDATION Fieldbus devices.
Product structure: Feature 610 "Accessory mounted", option NA "Overvoltage protection".
Technical data
Resistance per channel 2 × 0.5 Ω max.
Threshold DC voltage 400 to 700 V
Threshold impulse voltage < 800 V
Capacitance at 1 MHz < 1.5 pF
Nominal arrest impulse voltage (8/20 μs) 10 kA
External overvoltage protection
HAW562 or HAW569 from Hauser are suited as external overvoltage protection.
For detailed information please refer to the following documents:
• HAW562: TI01012K
• HAW569: TI01013K
7.2 Connecting the device
L
WARNING
Explosion hazard!
‣
Comply with the relevant national standards.
‣
Observe the specifications in the Safety Instructions (XA).
‣
Only use the specified cable glands.
‣
Check whether the supply voltage matches the specifications on the nameplate.
‣
Before connecting the device: Switch the supply voltage off.
‣
Before switching on the supply voltage: Connect the potential bonding line to the
exterior ground terminal.
Required tools and accessories:
• For instruments with safety pin for the lid: AF 3 Allen key
• Wire stripping pliers
• When using stranded wires: Wire end sleeves.