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OT-2, OT-3 & OT-3H Natural Gas Oxygen Measurement System

What is the capacity of the OT-3 acid scrubber?
I intend to power my OT-3H with solar panels. What would the wattage and amperage requirements be?
Can you walk through the calibration setup for me?


What is the capacity of the OT-3 acid scrubber?

It holds 0.24 lbs of Purafil.


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I intend to power my OT-3H with solar panels. What would the wattage and amperage requirements be?

The Micro-fuel Cell sensor has an absolute minimum operating temperature of approximately -11C (freezing temp). Because of this, the OT-3H has a heater circuit that will operated at temperatures of approximately 10C or less.

This heating circuit will consume 14W during it operation and maintains the cell holder temperature at 10C or more. The heater circuit is also used to heat the flow restrictor above the freezing temperatures.

The analyzers control unit consumes approximately 2.8 watts at all times. The OT-3H is designed to operate on a 12VDC nominal supply (10VDC min.).


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Can you walk through the calibration setup for me?

OT-3 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.

OT-2 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.

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.

• 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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