Selecting A Fixed Range Or Autoranging; Calibration - Teledyne 3300TA Operating Instructions Manual

Trace oxygen analyzer

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Table Of Contents

Table of Contents

Trace Oxygen Analyzer

4.5

The Model 3300TA 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

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.

4.6

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

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.