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2.0 OPERATION
2.1 Key features
The important features of the Teledyne API Model 450H Ozone Monitor are listed
below.
2.1.1 O
3
readout
The Teledyne API Model 450H O
3
Monitor constantly displays the current ozone
reading (in units selected) in the upper right hand corner of the alphanumeric display.
2.1.2 Concentration Alarms
The Teledyne API O3 Monitor provides two concentration alarms, HI and HI-HI. The
concentrations corresponding to each alarm levels can easily be set using the front panel
interface. Two form C relays for the two alarm level are provided on the rear panel. In
addition, the alarms can operate in either latching or non-latching modes.
2.1.3 O
3
analog output
The M450H provides an analog output of the current ozone reading on the rear panel (see
Figure 1.2). The output can be configured for 0-100mV, 0-1V, 0-5V, 0-10V. Isolated 4-
20mA or 2-20mA current output is available as an option. The voltage outputs are bi-
polar and also provide for 20% over-range.
2.1.4 E
2
ROM backup of software configuration
The Teledyne API O
3
Monitor has few DIP switches or jumpers that need to be set by
the operator. Configuration of the Monitor is done under software control and the
configuration options are stored in electrically erasable (E
2
) ROM. Thus, configuration
options are saved even when the Monitor is powered off.
There is one exception to this. The analog output voltage range is set by DIP Switches
on the A/D-I/O board as shown in Section 5.2.
2.1.5 RS-232 interface
The Teledyne API O
3
Monitor features an RS-232 interface which can output the
instantaneous and/or average O
3
data to another computer. It can also be used as a
command and status channel to allow a computer to control the Monitor.
For more details on the use of the RS232 interface, please contact Teledyne API and
request document number 01350.
P/N 02826B1 Teledyne API Model 450H O
3
Monitor Instruction Manual - Page 27