need to be tightened correctly (see figure 2.6 on p. 12).
Wiring Instructions
Wire the MTI10/MTL10 by opening the rear enclosure cover, bringing
customer-supplied wires in through the conduit openings and connecting to
the terminal blocks. The MTI10/MTL10 has two conduit openings to maintain
separation between AC input power and output signal wiring. To eliminate
the possibility of noise interference, use a separate conduit for AC power and
cut all wires short for a minimum service loop.
Wiring Precautions
• WARNING
- DO NOT OPEN WHEN ENERGIZED OR AN EXPLOSIVE
ATMOSPHERE IS PRESENT.
•
All plumbing and electrical installations of flowmeters must be in
compliance with local codes, the end user’s best engineering practices,
and manufacturer’s recommendations.
• An external power disconnect and 16A over-current protection are
required for the AC and DC powered MTI10/MTL10
•
Do not install the MTI10/MTL10 enclosure near an igniter, igniter-
controller or switching equipment.
• Do not install an external power supply in a cabinet containing an
igniter controller or switching equipment.
•
This flowmeter contains components that can be damaged by static
electricity. You must discharge yourself by touching a grounded steel pipe
or other grounded steel material prior to working inside this flowmeter.
•
For the remote sensor option, the serial number of the electronics
enclosure must match the remote sensor probe.
•
Close any unused entries using suitably certified plugs
Power Wiring
For power wiring, use stranded copper wire, no larger than 16-gauge. If
an external 24VDC power source is used, twisted pair shielded cable is
recommended. Supply connection wiring must be rated for at least 90°C
(194°F).
Grounding
The enclosure must be properly grounded with a quality earth ground. 16
gauge, stranded wire is recommended.
Signal Wiring
For signal wiring, the recommended wire gauge is 18 to 22 AWG. Always use
twisted pair shielded cable. The cable shield should not be connected at the
flowmeter, it should be connected at the power supply AC ground terminal or
instrumentation AC ground. Do not route the power and signal wires in the
same conduit. Power wires must enter left-hand conduit entry. Signal and
remote sensor (where applicable) must enter right-hand conduit entry.
15
Wiring: General
Scope
Precautions
Power Wiring
Grounding
Signal Wiring