3-7
If national standards are not in effect, follow these transmitter grounding guidelines:
•
Use copper wire, 14 AWG (2,5 mm
2
) or larger wire size, for grounding.
•
Keep all ground leads as short as possible, less than 1
Ω
Ohm impedance.
•
Connect ground leads directly to earth, or follow plant standards.
The transmitter has both an internal and an external grounding screw (see Figures 3-3 and 3-4).
Ground the transmitter according to applicable local standards.
3.5 Supplying Power
In all installations, power must be provided to the transmitter. Refer to Section 3.2.3 for information on
the transmitter’s power supply requirements.
1. Connect the power supply to terminals 9 and 10, under the Warning flap (see Figure 3-4).
Terminate the positive (line) wire on terminal 10 and the return (neutral) wire on terminal 9.
2. Ground the power supply using the equipment ground, also under the Warning flap.
3. A user-supplied switch may be installed in the power supply line. For compliance with low-
voltage directive 73/23/EEC (European installations), a switch in close proximity to the
transmitter is required.
Figure 3-4 Wiring the Transmitter Power Supply
Equipment
ground
9
10
Warning flap
Instruction and Operation Manual
X-CM-QmBS-eng
Part Number: 541B052AHG
June, 2008
Section 3 Installing Field-Mount Transmitter
QmBS Sensor / QTA Transmitters
