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O2I-FLEX Oxygen Sensor Interface Electronics

O2I-FLEX Oxygen Sensor Interface Electronics

The O2I-Flex Oxygen Sensor Interface Electronics provides the electronics necessary to power and control SST’s range of zirconium dioxide oxygen sensors.

The O2I-Flex oxygen sensor interface electronics can be user configured to output measuring ranges of 0-25% O₂ and 0-100% O₂. The entire measurement range is linear in both cases and offers three output options 0-10V, 4-20mA and RS232 comms interface.

The O2I-Flex can be calibrated in fresh air (20.7% O₂) or in any other known O₂ concentration by either an automatic or manual external trigger or via an on-board push button switch. The electronics offer power and sensor operating LEDs and removable polarised screw terminals for easy wiring.

The adaptive software filtering provides a fast sensor response coupled with a stable oxygen output.

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TECHNICAL SPECIFICATIONS

Supply voltage 24VDC ± 10%
Supply current 600mA max. at 24VDC
Digital output RS232
Analogue output 4—20mA; load 100—600Ω
  0—10VDC; load 10kΩ min
Temperature limits
  Storage -10 to 70⁰C
  Operating -10°C to +70°C
Oxygen pressure limits 1—1000mbar

OUTPUT VALUES

Oxygen range (analogue output) 0.12—25% O2
  0.12—100% O2
Oxygen range (RS232 output) 0.12—100% O2
Accuracy after calibration 1% O2
Repeatability after calibration 0.5% O2
Output resolution:
  0—10VDC: 0.01V
  4—20mA: 0.01mA
  RS232: 0.01% O2
Response time (step 10—90%)
  Fast response sensor connected: < 4s
  Standard response sensor connected: < 15s
Initial warm up time (till stable output) 5—10mins
Output inactive start up delay (heater warm up) 60s

OUTLINE DRAWINGS

ELECTRICAL INTERFACE

Pin Assignment
1 Sensor Heater GND (1)
2 Sensor Heater + (2)
3 Sensor Sense
4 Sensor Common
5 Sensor Pump
6 24VDC ± 10%
7 GND
8 4—20mA Output
9 0—10VDC Output
10 Calibrate
11 Cycle
12 RS232 Tx
13 RS232 Rx

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 butto
  • 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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