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GAS ANALYZER 359

5. O2S Cal Warning

The Oxygen Calibration Warning message indicates that the oxygen sensor did not

measure the minimum voltage required for a fixed oxygen setting. This occurs for the

following reasons: the oxygen sensor connector is not connected, not enough air flow is

reaching the oxygen sensor, or the oxygen sensor has reached the end of its useful life. If

the first two conditions are met, then replace the oxygen sensor.

6. NOx Zero Warning

The NOx Zero Warning message indicates that the sensor hardware is not working

properly. Re-run the NOx Zero procedure under the <MAINTENANCE> menu. If the

message returns, then an internal problem exists.

7. NOx Cal Warning

The NOx Calibration Warning message indicates that the NOx sensor did not measure the

minimum voltage required for a minimum NOx setting. This occurs for the following

reasons: the NOx sensor is connected improperly, the wrong bottle value for NOx was

entered during calibration, or the NOx sensor has reached the end of its useful life. If the

first two conditions are met, then replace the NOx sensor. If the bottle doesn't contain any

NOx, the NOx bottle value must be set to 0. (See Gas Analyzer Calibration on page 352).

8. Single Pt Cal Warn

The Single-point Calibration Warning occurs under two different operations. If this

message occurs during a zeroing operation, then the Oxygen Sensor is suspect. Check the

oxygen sensor connector. Re-zero, pressing 5 under the <GAS ANALYZER> menu.

This may need to be repeated. If the Single-point Calibration Warning occurs during a

Single-point Calibration, it indicates that one or more of the following gases (HC, CO,

CO2, or NOx) calibrated with more than 5% difference from the last Single-point

Calibration. Check the bottle values entered and perform a Single-point Calibration again.

If the bottle doesn't contain any NOx, the NOx bottle value must be set to 0. (See Gas

Analyzer Calibration on page 352).

9. Two Pt Cal Warn

The Two-point Calibration Warning occurs when one or more of the following gases (HC,

CO, or CO2) calibrated more than 5% difference from the last calibration. Recalibrate the

unit, checking the bottle values for correct concentrations. If the warning continues to

occur, refer to the Introduction section on Warranty and Repair information.

10. Low Flow

The Low Flow message indicates an obstruction in the sample system. Remove sample

hose from the analyzer. If the Low Flow condition goes away, check the hose for kinks or

obstructions. Blow air through it to remove possible obstructions. If the Low Flow

condition still exists, check the filters. If the Low Flow condition exists with the filter

bowl separated, then the unit has an internal problem. If the filter bowl is full of water,

stop testing and remove power immediately, inspect the check valve and drain filter, and

assure that the drain pump is operational.

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SEKURE SX-3100LCD Betreibershandbuch Seite 371