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Technical Support FAQ

3110 Series - Portable Oxygen Analyzers

How many data points can the 3110 store?
Can you go through the calibration setup for me?
What should I do if the display does not come on after charging the batteries.
We replaced the batteries and calibrated a 3110 unit at a customer location. Previously, our technician used the cell simulator and checked the whole thing out good, but the customer is saying that he even tried putting a new cell in it and it works great on the high end, but says it won’t measure below 12ppm! Any ideas what it could be or some way for us to check it out here?
How do I cold start the 3110?
When I install a sensor and apply a span gas, the reading displays "OVFL". What is this and how can I remove it?
There is a problem with one unit of 3110. It seems that the charge light still light on even when not in charging when on charging, the light will become brighter.
I am looking for some troubleshooting help on one of our Teledyne portable oxygen analyzers. It is specifically the 3110p model. We plug the charger in and the green light comes on however the batteries don't seem to take a charge. The machine will not turn on after a full night's charge. These batteries were recently replaced and both measure 3.4VDC from terminal to terminal. All of the connections appear good and the three fuses are working properly. Is there a transformer in the unit that converts the plug in to the correct voltage that could have gone bad? If you have seen this problem before, please advise on how to service this piece of equipment Feel free to call or email a response.


How many data points can the 3110 store?

The unit has a 3200 record capacity.

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Can you go through the calibration setup for me?

3110 calibration setup:
• Place the span gas cylinder near the analyzer in an upright position in a secure location.
• Attach the pressure regulator to the cylinder.
• Attach the flow restrictor to the regulator (flat end).
• Attach a 1/4” to 1/8”reducer to the restrictor (open end).
• Attach the sample line to the restrictor using the union.
• Attach a 1/4” to 1/8” reducer to the end of the sample line.
• Attach a quick release connector to the 1/4” reducer.

Purging calibration gear:
Prior to each use, the assembled calibration setup must be purged to remove air trapped in its various parts. This process will purge the system while minimizing both time and span gas use.
1. Do not terminate the calibration sample line at the analyzer end.
2. Momentarily crack open the span gas cylinder valve to pressurize the regulator and close the valve fully.
3. Allow the sample delivery set up to depressurize (about 4 seconds).
4. Repeat steps 2 and 3 at least five times.
5. Open the span gas cylinder valve fully.
6. The sample delivery system is now fully purged and ready for use.

Attaching the span gas and calibration:
When span gas is first delivered to the analyzer, it must be at a high flow rate because there will be air trapped in the analyzer’s span gas plumbing. This must be purged rapidly to allow the sensor to properly respond to the low levels of O2 in the span gas. Model 3110 portable analyzers do not typically have sample systems that could trap air and therefore require only low (.2-1 SCFH) flow rates.

• With the sample gas flowing, attach it to the analyzer’s span gas inlet.
• Select the span gas with the calibration valve on the analyzer.
• Adjust the pressure regulator to set the analyzer to its maximum flow rate, or to full scale on the analyzer’s flowmeter.
• Allow the analyzer to purge at this high rate for 2 minutes or until its reading starts to approach the correct span value.
• Reduce the pressure and set the analyzer’s flow rate to its standard value (the sample flow rate used for the sample gas; 0.2 - .5 SCFH typical).
• At 4 minute intervals, note the analyzer’s reading to determine if it has stabilized.
• After the reading has been stable for a period of 4 minutes, record the current O2 reading and adjust the analyzer’s span to match the span gas O2 content.
• After 4 minutes to verify the span reading is stable and correct.
• Select the sample gas with the analyzer’s span valve.
• The analyzer is ready to return to service.
• Close the span gas valve prior to disassembling the calibration setup.


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What should I do if the display does not come on after charging the batteries.

1) Adjust the contrast.
2) Momentarily, reconnect the AC power to the analyzer, then remove charger, and push the ON button,
.... If the red light blinks on, that will verify that the analyzer power is on. so just Adjust the contrast.
.... If the red light does not blink on, contact factory.

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We replaced the batteries and calibrated a 3110 unit at a customer location. Previously, our technician used the cell simulator and checked the whole thing out good, but the customer is saying that he even tried putting a new cell in it and it works great on the high end, but says it won’t measure below 12ppm! Any ideas what it could be or some way for us to check it out here?

The first thing to do is to check the unit for leaks. The easiest way to do this is to flow sample or N2 gas for say 45 minutes at 1scfh, and wait for a stable reading. Then double the flow and see if the reading goes down. If so there is most likely a leak somewhere in the analyzer or tubing connected to it. If it is the analyzer the common spots are the oring and or the quick disconnect fittings.

The other thing that can cause is a bad or exhausted fuel cell sensor.

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How do I cold start the 3110?

With the unit powered down, while holding the ESC button down, press and hold the ON button. The analyzer should power up and display “RESETTING EEPROM,” indicating the memory has been set to factory defaults.

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When I install a sensor and apply a span gas, the reading displays "OVFL". What is this and how can I remove it?"

OVFL indicates an overflow in the memory, an issue that may have been caused by calibrating without any sensor signal such as doing a span calibration with no sensor or a disconnected simulator installed. Ensure the sensor is making proper contact or a proper sensor signal is being applied, and reattempt the calibration.

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There is a problem with one unit of 3110. It seems that the charge light still light on even when not in charging when on charging, the light will become brighter.

Open the cover, and remove the power cable to see if the charging light still on.


If the light turn off, that means something short on the power cable. If the light still on, that means the PCB has problem.

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I am looking for some troubleshooting help on one of our Teledyne portable oxygen analyzers. It is specifically the 3110p model. We plug the charger in and the green light comes on however the batteries don't seem to take a charge. The machine will not turn on after a full night's charge. These batteries were recently replaced and both measure 3.4VDC from terminal to terminal. All of the connections appear good and the three fuses are working properly. Is there a transformer in the unit that converts the plug in to the correct voltage that could have gone bad? If you have seen this problem before, please advise on how to service this piece of equipment Feel free to call or email a response.

Can you please open up the unit by removing the back panel and look on the PCB if IC chips at U16 and U17 are installed. They should not be installed. Their location would be on the same side of the LCD display, near the right edge below the enter button and above the contrast pot.

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