SST O2I-Flex Manual Download Page 4 | Manualshive

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© 2010 SST Sensing Ltd 4 www.sstsensing.com
DS0074 Rev 7

OUTLINE DRAWING AND MOUNTING INFORMATION

60mm

60mm

67mm

67mm

4 x M4 Mounting holes on industry standard 60x60mm pitch

PCB LAYOUT

O2I

-

Flex

Oxygen Interface

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Summary of Contents for O2I-Flex

Page 1: ...lectable output filtering allows adaptive fast and dynamic or slow and stable output response Power and Sensor Operating LEDs Removable polarised screw terminals for easy wiring SPECIFICATIONS Maximum ratings Supply voltage 24VDC 10 Current consumption 600mA max 24VDC 4 20mA Load 100 600Ω Temperature limits Storage 10 to 70 C Operating 10 to 70 C O2I Flex APPLICATIONS Combustion control including ...

Page 2: ...ygen sensors do not directly measure the oxygen concentration but instead measure the partial pressure of oxygen within the measurement gas In order to output an oxygen concentration the O2I FLEX must be calibrated or more specifically re referenced in a known gas concentration typically normal air Calibration or re referencing is achieved by connecting the calibration input to GND or by pressing ...

Page 3: ...ial pressure of oxygen PPO2 within the measurement gas deviations in the Barometric Pressure BP from that present during calibration will cause readout errors proportional to the change For example if the sensor was reading 21 O2 at 1013 25mbar and the BP increased by 1 the sensor readout would also increase by 1 to 21 21 O2 OXYGEN SENSOR HEATER ADJUSTMENT The Oxygen Sensor heater must be adjusted...

Page 4: ...0 SST Sensing Ltd 4 www sstsensing com DS0074 Rev 7 OUTLINE DRAWING AND MOUNTING INFORMATION 60mm 60mm 67mm 67mm 4 x M4 Mounting holes on industry standard 60x60mm pitch PCB LAYOUT O2I Flex Oxygen Interface ...

Page 5: ...ery SST oxygen sensor has two heater connections which should be connected to pins 1 2 of the O2I Flex the heater coil has no polarity However when connecting to a sensor where the sensor housing is one of the heater connections pin 1 of the O2I Flex should be connected to the housing SYSYEM BLOCK DIAGRAM PIN Description 1 Sensor Heater GND Yellow H 2 Sensor Heater Yellow H 3 Sensor Sense Blue S 4...

Page 6: ...onnections ensure Tx goes to Rx of the PC and Rx goes to Tx of the PC The O2I Flex communicates via standard COM port settings that are default on most PCs and many other RS232 compatible devices If however communication problems are occurring use the settings below to configure the PC or device COM Port O2I Flex Oxygen Interface ...

Page 7: ...ith the amount of averaging user variable whilst the raw un averaged values allow the user to detect sudden oxygen changes The averaged value is the measurement output on both the 4 20mA and 0 10VDC outputs The sensor Td value is the measure of the partial pressure of oxygen in the measurement gas The O2 concentration is the Td value scaled by the stored calibration value To stop or restart the da...

Page 8: ...onse to oxygen changes Press Enter to save The new averaging value is now stored in memory This value is retained on power loss Adjusting the Minimum and Maximum Ranges of the Analogue Outputs 4 20mA and 0 10VDC The O2I FLEX is factory default to output a range of 0 25 O2 via its two analogue outputs This range can be expanded to 0 100 O2 as described on Page 6 When the unit is reconfigured to out...

Page 9: ...umed At this point remove GND from PIN 10 or release the calibration switch The output will now track to the correct value for the calibration gas Calibration is complete Calibration values are retained on power loss Manual Calibration Ensure the O2I FLEX is configured for manual calibration See CONFIGURATION on Page 6 Place the sensor probe in the calibration gas typically normal air Allow the ou...

Page 10: ...ng from Water Droplets In environments where falling water droplets are likely the sensor should be protected from water falling directly onto the very hot sensor cap as this can cause massive temperature shocks to the cell and heater Popular methods include a hood over the sensor cap or for the sensor to be mounted in a larger diameter cylinder At a very minimum the sensor cap should be angled do...

Page 11: ...te O2 measurement is required Investigated gases were H2 Hydrogen up to 2 stoichiometric combustion CO Carbon Monoxide up to 2 stoichiometric combustion CH4 Methane up to 2 5 stoichiometric combustion NH3 Ammonia up to 1500 ppm stoichiometric combustion 2 Heavy Metals Vapours of metals like Zn Zinc Cd Cadmium Pb Lead Bi Bismuth will have an effect on the catalytic properties of the Pt electrodes E...

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