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FIGURE 1.4 - ELECTRICAL SIGNAL I/O CONNECTIONS
1.6 Electrical I/O Connections
1.6.1 Analog Output
The analog output is a two pin connector (See Figure 1.4). The analog output can be
configured for voltage or current output. The standard is a 0-5 volt output. 0-100mV, 0-
1V, 0-10V, and 4-20 mA outputs are also available. See Section 5.2 for information on
setting other output ranges.
1.6.2 Relay Outputs
Three form C relay outputs are provided on three pin connectors (See Figure 1.1). These
outputs correspond to the ‘HI’ and ‘HI-HI’ concentration alarms and a System OK status
output that is used to indicate a fault or error condition in the instrument. The relay
contacts are rated to 3A at 240VAC. Do not exceed these ratings when connecting
equipment to the instrument.
1.6.3 Digital Outputs
There are 12 digital output. These outputs are optically isolated NPN transistors which
can pass 50 mA of DC current. These outputs can be used to interface to devices that
accept logic-level digital inputs, such as Programmable Logic Controllers(PLC’s).
The outputs labeled ‘STATUS OUT’ are used to indicate instrument operational status
and fault conditions. Table 1.1 below summarizes the functions of all the digital outputs.
P/N 02826B1 Teledyne API Model 450H O
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Monitor Instruction Manual - Page 19