Teledyne 3300TB operating instructions Selecting a Fixed Range or Autoranging, Calibration

Trace Oxygen Analyzer Operation 4

4.5Selecting a Fixed Range or Autoranging

The Model 3300TB can operate in fixed high, fixed low, or autoranging mode. To change modes:

1.Press and then release the SET HI RANGE and the SET LO RANGE buttons simultaneously.

2. Within 5 seconds, press either the ∆ or ∇ button until Auto, Lo, or Hi displays on the LCD, as desired.

After about three seconds, the analyzer resumes monitoring in the selected range mode.

NOTE: If the concentration exceeds 9999 ppm oxygen, the analyzer will automatically switch to the Calibration Range, EVEN THOUGH IN-

STRUMENT IS IN THE FIXED RANGE MODE.

4.6Calibration

Preliminary—If not already done: Power up the Analyzer and allow the LED reading to stabilize. Set the Alarm setpoints and the fullscale ranges to the desired values.

Procedure:

1.Expose the sensor to ambient air or instrument grade air (20.9 % oxygen). Allow time for the sampling system to purge and the analyzer to achieve equilibrium.

Note: If the analyzer output goes above the high alarm setpoint or below the low alarm setpoint, the display will go blank and the front panel ALARM Indicator, beneath the SET Function buttons, will blink. Hold down the SPAN button until the ALARM Indicator stops blinking.

2. Press the SPAN button once.

3. Within 5 seconds press either the ∆ or ∇ button until the display is stable and reads 20.9 %.

The unit is now calibrated.

Note: If you use a span gas other than air, do not span in the 0-10 ppm range. Calibration at this level is not dependable.

Note: If you use a span gas other than air, and the span gas oxygen concen- tration is less than 10,000 ppm, the analyzer could take up to 65 seconds to to settle. The lag is caused by a digital filter that is active only below 10,000 ppm (1%) oxygen.

Teledyne Analytical Instruments 4-5