Teledyne 7300A manual Auto Mode Zeroing

Infrared Gas Analyzer Operation 4

If you want to calibrate ALL of the ranges at once (multiple application analyzers only), use auto mode zeroing in the Cal Range.

Make sure the zero gas is flowing to the instrument. If you get a CELL CANNOT BE BALANCED message while zeroing skip to section 4.4.1.3.

4.4.1.1Auto Mode Zeroing

Observe the precautions in sections 4.4 and 4.4.1, above.Scroll to ZERO function buy using UP/DOWN control and enter the zero function mode. The screen allows you to select whether the zero calibration is to be performed automatically or manually. Use the UP/DOWN key to toggle between AUTO and MAN zero settling. Stop when AUTO appears, blinking, on the display.

Select zero mode: AUTO

Press Enter to begin zeroing.

####.## % CO2 Slope=#.### C—Zero

The beginning zero level is shown in the upper left corner of the display. As the zero reading settles, the screen displays and updates information on Slope= in ppm/second (unless the Slope starts within the acceptable zero range and does not need to settle further). The system first does a course zero, shown in the lower right corner of the screen as C—Zero, for approximate 3 min, and then does a fine zero, and displays F—Zero, for approximate 3 min.

Then, and whenever Slope is less than 0.01 for at least 3 min, instead of Slope you will see a countdown: 9 Left, 8 Left, and so fourth. These are software steps in the zeroing process that the system must complete, AFTER settling, before it can go back to Analyze. Software zero is indicated by S–Zeroin the lower right corner.

####.## %	CO2
4 Left=#.###	S—Zero

The zeroing process will automatically conclude when the output is within the acceptable range for a good zero. Then the analyzer automatically returns to the Analyze mode.

Teledyne Analytical Instruments 4-17