Installation 1-9
September 2004
Wiring Transducers (cont.) 4. For a 2-Channel AT868, repeat steps 1-3 to connect the CH2
transducers to the DN and UP terminal block for Channel 2.
Note: It is not
required that both channels of a 2-Channel unit be
connected.
5. Do one of the following:
• Proceed to another section to continue wiring the AT868.
• Reinstall the plastic shroud, replace the front cover on the
enclosure and tighten the screws.
IMPORTANT: Each channel must be activated before it can begin
taking measurements. See Chapter 2, Programming
Site Data, for instructions.
Wiring Standard
0/4-20 mA Analog
Outputs
The AT868 has one isolated 0/4-20 mA analog output per channel
(designated as Output A and Output C). These outputs can be
configured independently. Typically, Output A is used for Channel 1
and Output C is used for Channel 2. However, either analog output
can be configured for use with either channel.
Connections to the analog outputs may be made with standard
twisted-pair wiring, but the current loop impedance for these circuits
must not exceed 600 ohms. To wire the analog outputs, complete the
following steps:
1. Refer to Figure 1-5 on page 1-16 for the locations of the
appropriate terminal blocks and wire the analog outputs as shown.
Then, secure the cable clamp.
IMPORTANT: Outputs 1 and 2 in the wiring diagram correspond to
Outputs A and C in the AT868 software.
2. Do one of the following:
• Proceed to another section to continue wiring the AT868.
• Reinstall the plastic shroud, replace the front cover on the
enclosure and tighten the screws.
IMPORTANT: Prior to use, the analog outputs must be calibrated as
described in Chapter 4, Calibration.
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