5
Note: The Model 10 D.O. sensor undergoes a
thorough and accurate test and calibration
procedure before shipment from the factory.
Calibration of the D.O. reading at startup is not
necessary and is not recommended.
Analog Outputs
Two isolated 4-20 or 0-20 milliamp signals capable of driving 600 ohms are available from the
terminal block labeled TB1. See drawing IIG04R111 for details. The analog #1 output, for channel #1, is
labeled "I 1" and the analog #2 output, for channel #2, is labeled “I 2”. The common or ground for these
signals are labeled "ICOM”.
Digital Output
A Modbus communications (RS-485) output is available from TB2. This is a three wire signal with a
transmit plus (labeled X+), a transmit minus (labeled X-), and a transmit ground or common (labeled X
COM). See drawing IIG04R111 for details. The RS-485 interface is electrically isolated from the
measurement and microprocessor circuitry of the Model 2000. The communications protocol for the
Digital Output is fully described in Appendix A.
Relay Outputs
There is one independent programmable set point control relay for each channel. These relays are
Form-C with contacts rated 10/6 amps resistive load at 125/250 VAC. Two Form-A relays with contacts
rated 10/6 amps resistive load at 125/250 VAC are used for the jet clean function. The connections for
the relay outputs are available from TB6. See drawing IIG04R111 for connection details.
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