Teledyne M5000B operating instructions Cell Failure, Sccm

3 Operation/Control Unit Model 5000B

####.## % SO2 Zero adj:2048 C—Zero

The analyzer goes through C–Zero, F–Zero, and S–Zero. During C– Zero and F–Zero, use the DÑ keys to adjust displayed Zero adj: value as close as possible to zero. Then, press Enter.

S–Zero starts. During S–Zero, the Microcontroller takes control as in Auto Mode Zeroing, above. It calculates the differences between successive samplings and displays the rate of change as Slope= a value in parts per million per second (ppm/s).

####.## % SO2 Slope=#.### S—Zero

Generally, you have a good zero when Slope is less than 0.05 ppm/s for about 30 seconds.

Once zero settling completes, the information is stored in the analyzer’s memory, and the instrument automatically returns to the Analyze mode.

3.4.1.3 Cell Failure

Detector failure in the 5000BF is usually associated with inability to zero the instrument with a reasonable voltage differential between the refer- ence and measure voltages. If this should ever happen, the 5000BF system alarm trips, and the LCD displays a failure message.

Detector cannot be balanced

Check your zero fluid

Before optical balancing:

a.Check your zero fluid to make sure it is within specifications.

b.Check for leaks downstream from the Sample Cell, where con- tamination may be leaking into the system.

c.Check flowmeter to ensure that the flow is no more than 200

SCCM

d.Check temperature controller board.

e.Check fluid temperature.

f.Check the Sample Cell for dirty windows.

If none of the above, proceed to perform an optical balance as described in section 5.

3-18 Part I

Teledyne Analytical Instruments