WGM - 28 November 2007 - Edition 01
PAT700 Total Organic Carbon Analyzer – Installation Page 23
Anatel Operator Manual
I/O wiring
The analyzer has three 4-20 mA outputs, two discrete inputs, and four discrete outputs.
4-20 mA outputs
The analyzer has three 4-20 mA outputs, as listed in Table 2-7.
• Analog output 1 represents TOC (total organic carbon).
• Analog output 2 represents conductivity or resistivity (user selected).
• Analog output 3 represents temperature in °F or °C (user selected).
Discrete inputs
The analyzer has two discrete inputs, as listed in Table 2-8.
• Discrete input 1 initiates TOC analysis. When the output state switches from high to
low, the analyzer stops the current operation and runs a single TOC analysis. After the
analysis is complete, the analyzer returns to the mode defined by digital input 2. During
the TOC analysis, the analyzer ignores all subsequent trigger values.
• Discrete input 2 switches the analyzer modes. If digital output 2 is in high state, the
analyzer is in TOC mode. If digital output 2 is in low state, the analyzer runs in flow with
conductivity mode.
Table 2-7 4-20 mA output wiring terminal designations
Wiring connector Terminal Description Variable Designation
1 4-20 mA source output for analog output 1 (+) TOC AO1+
2 4-20 mA sink output for analog output 1 (–) TOC AO1–
3 4-20 mA source output for analog output 2 (+) Conductivity or
resistivity
AO2+
4 4-20 mA sink output for analog output 2 (–) Conductivity or
resistivity
AO2–
5 4-20 mA source output for analog output 3 (+) Temperature AO3+
6 4-20 mA sink output for analog output 3 (–) Temperature AO3–
Table 2-8 Discrete input wiring terminal designations
Wiring connector Terminal Description Variable Designation
1 Common connection for external sourcing (+) Common DI1/2+
2 Digital input 1 voltage source return input (–) Initiates TOC analysis DI1–
3 Digital input 2 voltage source return input (–) Analyzer mode DI2–
4 • 12 VDC power supply +
• Connect only if output device requires power
supply
Output power supply +12V
5 • 12 VDC power supply –
• Connect only if output device requires power
supply
Output power supply GND
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