GE AquaTrans AT868, User Manual

Page: 15 / 158

September 2004
1-6 Installation
Wiring Transducers
!WARNING!
Before connecting the transducers, discharge any static
buildup by shorting the center conductor of the transducer
cables to the metal shield on the cable connector.
Note:
For transducer frequencies below 2 MHz, the cable lengths
must be within 4 in. (10 cm) of each other. If the transducer
frequency exceeds 2 MHz, the cable lengths must be within 0.5
in. (1.25 cm) of each other.
1.
Follow the instructions on page 1-4 to prepare the unit before you
connect power.
2.
Locate the CH1 transducer cables and connect them to the two
CH1 transducers. Feed the free ends of the cables through the
selected conduit hole in the electronics enclosure.
3.
If an optional lightening protector is being installed, connect it
between the meter and the transducers.
4.
Refer to the wiring diagram in Figure 1-4 on page 1-14 and
connect the transducer cables to the terminal block labeled DN
and UP for Channel 1. Then, secure the cable clamp.
Note:
The RED cable leads are the SIG(+) leads and the BLACK
cable leads are the RTN(-) leads.
!ATTENTION EUROPEAN CUSTOMERS!
To meet CE Mark requirements, all cables must be installed
as described in Appendix B, CE Mark Compliance .
5.
For a 2-Channel (path) AT868, repeat steps 2-4 to connect the
CH2 transducers to DN and UP terminal block for Channel 2. It is
not required that both channels/paths of a 2-Channel unit be
connected.
Note:
The AT868 uses two channels or paths to make more accurate
flow measurement by averaging, subtracting or adding the
channels/paths together.
6.
Do one of the following:
•
Proceed to the next section to continue wiring the Model AT868
flow transmitter.
•
Reinstall the plastic shroud, replace the front cover on the
enclosure and tighten the screws.
Note:
A channel must be activated before it can begin taking
measurements. See Chapter 2,
Programming Site Data , for
instructions.