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Technical Support FAQ

3190Z - Trace Oxygen Analyzer (ZrO2 sensing)

What is the minimum flow rate for the 3190Z and 3290Z units?
Why is it that when you power down the unit after restart, the display reads 0.0 until it is calibrated?
Why is it that when you push the span button it goes straight to 20.9% so you have to bring the point down to 10 ppm or whatever your gas is?
What is the warm up time for the 3190Z? Can we leave the analyzer on without gas flowing? This is for a batch process that will see air at the start and need to run around 500 ppm in x minutes. Will there be any issues?
What is the maximum resistive load on the 4-20mA analog output?
What gases can harm the zirconium oxide sensor?


What is the minimum flow rate for the 3190Z and 3290Z units?

1 scfh. Below this erratic and inaccurate operation will result.

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Why is it that when you power down the unit after restart, the display reads 0.0 until it is calibrated?

When you power up, it takes a couple minutes for the bias voltage and the sensor heater to reach full potential. So immediately after power up, the unit should start reading 0.0 because the sensor reaction is not activated. It will then adjust to true reading.

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Why is it that when you push the span button it goes straight to 20.9% so you have to bring the point down to 10 ppm or whatever your gas is?

The ziconium sensor is easily calibrated in air since it recovers fast and air concentration has no detrimental consequences. We recommend air calibration for this type of sensor.

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What is the warm up time for the 3190Z? Can we leave the analyzer on without gas flowing? This is for a batch process that will see air at the start and need to run around 500 ppm in x minutes. Will there be any issues?

The Zirc oxide sensor takes a few minutes to warm up. When you say "leaving the analyzer on without gas flowing," I'm assuming you mean air will eventually get to it. If the unit is powered down, air exposure is no problem. Even if it is exposed to air, it's not as detrimental to a ZrO2 sensor as it is with a fuel-cell, but exposing it to high O2 while powered will result in a slower recovery time. We're talking minutes, not hours.

The one drawback of the ZrO2 is that it can only read trace. Depending on the configuration, the sensor will saturate before getting anywhere near percent levels. You may want to run the application and customer's desired O2 range by us just to make sure.

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What is the maximum resistive load on the 4-20mA analog output?

Maximum resistive load is 500 ohms.


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What gases can harm the zirconium oxide sensor?

Streams containing H2S or Sox, organic vapors or halogens (e.g. F, Cl, Br) should be avoided, as well as water or condensed humidity.

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