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O2I-FLEX Oxygen Sensor Interface Electronics

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Specification

TECHNICAL SPECIFICATIONS

Supply voltage24Vdc +/- 10%
Supply current600mA max. at 24Vdc
Digital outputRS232
Analogue output4-20mA; load 600Ω max or
0-10Vdc; load 10kΩ min
Temperature limits
    Storage-10 to 70⁰C
    Operating-10 to 70⁰C
Oxygen pressure limits¹1 to 1000mbar

OUTPUT VALUES

Oxygen range (analogue output)³0.1² to 25% O₂ or
0.1² to 100% O₂
Oxygen range (RS232 output)0.1² and 100% O₂
Accuracy after calibration⁴⁵1% O₂
Repeatability after calibration⁴0.5% O₂
Output resolution
    Analogue 4-20mA0.01mA
    Analogue 0-10Vdc0.01V
    Digital RS2320.01% O₂
Response time
    Fast response sensor connected:<4s
    Standard response sensor connected:<15s
Initial warm up time (until stable output)5-10 mins
Output inactive start up delay (heater warm up)60s


OUTLINE DRAWINGS

outline-drawing

¹Sensor and interface for correct barometric pressure compensation.
²Prolonged operation below 0.1% O₂ can damage the sensing element.
³Range selectable by altering the position of the jumper links on the PCB, refer to datasheet for details.
⁴Assuming barometric pressure (BP) remains constant.
⁵As the O₂ sensor measures the partial pressure of oxygen (PPO₂) within the measurement of gas deviation in the BP from the present during calibration will cause readout errors proportional to the change, e.g. if the sensor reads 21% O₂ at 1013.25mbar and the BP increases by 1%, the sensor readout will also increase by 1% to 21.21% O₂.

ELECTRICAL INTERFACE

 

Electrical-connections

PinAssignment
1Sensor heater GND (1)
2Sensor heater + (2)
3Sensor sense
4Sensor common
5Sensor pump
624Vdc +/- 10%
7GND
84-20mA output
90-10Vdc output
10Calibrate
11Cycle
12RS232 Tx
13RS232 Rx

Features & Benefits

FEATURES

  • Provides the electronics necessary to power and control SST’s range of zirconium dioxide (ZrO₂) sensors
  • Externally triggered automatic or manual calibration. Calibration can also be initiated via an on-board push button
  • Power and sensor operating LEDs
  • Removable polarised screw terminals for easy wiring

BENEFITS

  • Adaptive software filtering provides a fast sensor response coupled with a stable oxygen output
  • High accuracy linear output
  • Can be calibrated in fresh air (20.7% O₂) or in any other known O₂ concentration

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