ANATEL A643, Operator'S Manual, Page: 129 / 222

Anatel A643a - Analog Outputs 129 of 220
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Operator Manual
5) Press Esc repeatedly to exit this function and return to the normal display.
9.3
Optional Conductivity/Resistivity & Temperature Outputs
Note:
Resistivity DAC: P/N FG2006702
Temperature DAC: P/N FG2006802
The necessity for an analog output to report the Anatel A643a’s conductivity (or resistivity) and
temperature values is addressed through external Digital-to-Analog Converter (DAC) Modules.
A separate DAC Module is required for each desired analog output. Anatel supplies pre-
programmed, prewired DAC Modules to forward this processed information to a data
acquisition system, remote meter or other analog input device. Software setup of the External
DAC Module includes enabling the Analyzer output, defining its range as well as its zeroscale
and full-scale values, and the signal that is to be output in the event of an alarm.
9.3.1 Hardware Setup
Note:
Refer to the manufacturer’s manual for complete instructions on installing and using external
DAC Modules.
External DAC Modules are connected to the Anatel A643a at its DIAGNOSTICS Port. This
RS232C serial interface communicates at 1200 baud, 8 data bits, 1 stop bit and no parity.
Three- or five-conductor cable is adequate for this analog interface (AWG 24 is recommended).
Two DAC Modules can be daisychained to obtain both conductivity (or resistivity) and
temperature data and can be positioned up to 50 feet from the associated Analyzer. Anatel
provides five feet of cabling.
CAUTION:
Always disconnect the instrument from its power source before attempting to access internal
components.
Fig 9-17 : DAC Calibration Output Screen