Teledyne 460H Operation, Front Panel Display, 4.1.1 O3 readout, Pressure Display, Status LED’s

4.0 Operation

The M460H has been designed for simple and trouble-free operation. The Sections below detail the operational features of the M460H.

4.1Front Panel Display

4.1.1O3 readout

The current ozone concentration is displayed in the 4 digit readout in the center of the display. The concentration is displayed in the currently selected units, either wt% or g/Nm3.

4.1.2 Pressure Display

The pressure inside the measurement cell can be displayed on the readout by pressing and holding the ‘Pressure’ key on the front panel. The pressure is displayed in units of psia (pounds per square inch absolute.) The normal ambient pressure at sea level is about 14.7psia. Ambient pressure at higher elevations will be somewhat less.

The M460H can accurately measure ozone at cell pressures of 12 - 20psia. Care should be taken in setting up the monitor to avoid over-pressurizing the cell, as this will result in erroneous readings.

4.1.3 Zero Calibration

A Zero Calibration can be performed on the monitor at any time by simultaneously pressing the two ‘Zero’ buttons on the front panel. The monitor will briefly display dashes (‘----‘) after which the concentration should quickly go to zero.

The Zero Calibration is calculated based on the current measurement in the cell; so care must be taken to ensure that all ozone is purged from the cell before pressing the ‘Zero’ buttons.

If the Auto-Zero option is not used, API recommends performing a manual Zero Calibration on the monitor once a week.

4.1.4 Status LED’s

The four status LED’s to the right of the display indicate the general status of the Model 460H Monitor. During normal operation, after the monitor has warmed up, the green ‘Sensor OK’ LED should be on and all other Status LED’s should be off. For information on troubleshooting using the Status LED’s, see Chapter 7.

P/N 03662D Teledyne API Model 460H O3 Monitor Operator Manual - Page 19