The horn relay operates as a true alarm system and can be connected directly to a horn. The horn relay is latching and
can be reset by pressing the alarm button. The contacts (terminals 28 and 29) will be closed whenever the alarm light is
flashing. Refer to Figure 3.5.
3.6 USING THE AUTOMATIC OXYGEN CHECK SYSTEM
The on-line oxygen calibration system is optional. The gas change-over solenoid must be mounted external to the
cabinet. Typical connection details are shown in Figure 3.5.
For details on its operation refer to Section 2.9.
Figure 3.5 Automatic Oxygen Calibration check Solenoid Connection
Mains Volta
e 110/240
AC Solenoids
Cal 2
Solenoid
4
Pur
e
Pur
e
Cal 1
Solenoid
Cal 1
Solenoid
Cal 2
45
43
44
41
42
3.7 CONNECTING THE PRINTER
RS 485 network
24
23
22
20
21
Serial Port Connections
A printer with a serial port, or a data logger, or a computer terminal may be connected to RS 232-C or the network port.
Data is logged out of the port as arranged in Set-up steps 52 to 54. The baud rate is selectable in set-up step 55. The
RS-232 protocol for the serial port is eight data bits, one stop bit, no parity.
Teledyne Analytical Instruments 9070 Oxygen Analyzer Page 19
