Electrical Interconnections; Conduit Seal And Pressure Relief; Figure 2-10. Conduit Entry Seal Installation - ABB MINI-MAG 10D1475 Instruction Manual

10D1475 MINI-MAG MAGNETIC FLOWMETER INSTRUCTION BULLETIN

2.5 Electrical Interconnections

The Series 10D1475 Magnetic Flowmeter may be furnished with either an integrally or remotely
mounted Signal Converter. Interconnection wiring is arranged differently for the two systems. Refer
to interconnection diagrams provided in the Instruction Bulletin supplied with the appropriate Signal
Converter for wiring details.
WARNING
ELECTRICAL SHOCK HAZARD. Equipment powered by AC line
voltage presents a potential electric shock hazard to the user.
Make certain that the system power input leads are disconnected
from the operating branch circuit before attempting electrical
interconnections.
Regardless of the interconnection procedure required, the grounding procedures given in Section 2.4
must be followed.

2.6 Conduit Seal and Pressure Relief

In accordance with the National Electrical Code (NEC) ANSI/NFPA 70, Article 501-5(f)(3), the
flowmeters include a conduit entry seal and pressure relief to prevent the process liquid from
entering the electrical conduit system. These safety features consider the remote possibility of a
primary seal failure between the meter and the electronic housing.
The conduit entry seal will prevent the
process liquid from entering the electrical
conduit system. This seal consists of a
conduit entry cable seal on the meter
junction box. It is the user's responsibility
to properly install the conduit entry cable
seal fitting supplied with the Signal Con-
verter interconnection cable. This will en-
sure proper performance of this safety
feature. Refer to Figure 2-15.
A pressure relief is provided in the elec-
tronics housing of the flowmeter. The
pressure relief is located in the center of
the cover joint on the side opposite from
the conduit connection. If the primary
seal should fail, the pressure relief will
vent the process preventing an over
pressurization and potentially dangerous
failure of the electronics housing. It is the
user's responsibility to be aware of this
safety feature and to consider the un-
likely event of its functioning. Based on
knowledge of the process and meter ap-
plication, the user should consider the
use of deflectors to safely direct the
vented process.
FIGURE 2-10. CONDUIT ENTRY SEAL
INSTALLATION
INSTALLATION 2-13