Grounding; Safety Barriers For Is Installation - MTS Systems Level Plus Operation And Installation Manual

Grounding

Note:
Grounding the transmitter through a threaded conduit connection does not provide sufficient ground.
There are two methods to provide an earth ground to the earth ground of the electronics. Refer to' Table 2' for safety barrier references.
• Run an earth ground through the conduit and connect directly to the earth ground lug inside the housing.
• Run an earth ground directly to the ground lug on the outside of the housing.

Safety barriers for IS installation

Refer to Table 2 for entity parameters and Figure 12 for passive and active safety barrier types for Model MR transmitter installations.
Entity parameters
FM Vmax = 28 Vdc
Imax = 118 mA per loop circuit
Ci = 0.0 µF per loop circuit
Li = 220 µH per loop circuit
CSA Vmax = 36.1 Vdc
Imax = 118 mA
Ci = 0.0 µF
Li = 220 µH
ATEX Vmax = 28 Vdc
∑ Imax = 118 mA per loop (circuit)
Ci = negligibly low
Li = 220 µH per loop (circuit)
Supplier Type
STAHL 9001/51-280-091-141
Table 2. Safety barrier entity parameter references
24 Vdc
Supply-
Voltage
Figure 12. Safety barrier connections
MTS Sensors
Maximum Maximum current
voltage (each channel)
28 Vdc 91 mA
Non Hazardous Area
Certified
Safety Barriers
I (A)
4-20
I.S. Ground connection
mA
17
Model MR Operation and Installation Manual
Grounding and Safety Barriers
Maximum power Maximum resistance
(each channel) (each channel)
637 mW 350Ω
Hazardous Area
Transmitter
Level Plus ® Liquid-Level Transmitters - M-Series Model MR Analog Transmitter
Operation and Installation Manual, Part No.: 550720 Revision K (EN) 02/2016
Number of
channels
1