September 2004
1-8 Installation
Wiring the Totalizer/
Frequency Output
The Model AT868 also provides a second output per channel
(designated as Output B and D) that can be configured as a totalizer
or frequency output using the Instrument Data Manager (IDM)
software.
Like the analog outputs, these outputs can also be configured
independently. Typically, Output B is used for Channel 1 and
Output D is used for Channel 2; however, outputs can be configured
to measure either channel.
Figure 1-1 below shows a sample wiring diagram of a totalizer and
frequency output circuit.
Figure 1-1: Totalizer/Frequency Output Wiring
!WARNING!
DO NOT CONNECT EXTERNAL POWER TO THE
PULSE/FREQUENCY OUTPUT TERMINALS.
To wire the totalizer/frequency outputs, complete the following steps:
1. Follow the instructions on page 1-4 to prepare the unit before you
connect power.
2. Refer to Figure 1-4 on page 1-14 for the location of the
appropriate terminal blocks and wire the totalizer/frequency
outputs as shown. Secure the cable clamp.
Note: Analog outputs 1 and 2 in the wiring diagram correspond to
analog outputs B and D in the AT868 software.
!WARNING!
To meet CE Mark requirements, all cables must be installed
as described in Appendix B, CE Mark Compliance.
3. 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.
+5V
200
OUT
RTN
IN
Common
Model AT868 Pulse/Frequency Counter
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