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Zirconia Oxygen Sensor System

Zirconia Oxygen Sensor System

The Zirconia Oxygen Sensor System offers a complete solution, removing the need for customers to develop their own electronics. Frequently used in combustion control systems, burning coal, oil, gas and biomass and in oxygen generation systems.

The Zirconia Oxygen Sensor System consists of SST’s fast response (<4s T90) zirconium dioxide (ZrO₂) screw fit sensor in conjunction with the OXY-LC oxygen sensor interface board.

The system employs a well proven, zirconium dioxide element at its heart and, due to its innovative design, does not require a reference gas. This, along with its rugged stainless steel construction means the sensor can be used in extreme temperatures and aggressive environments.

These oxygen sensors use a unique closed loop measurement system. While the sensor continuously measures the oxygen level, a heartbeat signal is also generated, providing an immediate warning of any failures.

The sensor is housed in a short probe with an M18x1.5mm thread, making installation quick and easy. The oxygen sensor can operate in temperatures ranging from -100°C to 250°C and has a lifetime of up to 10 years (depending on the application).

When connected to the OXY-LC interface board, the zirconia oxygen sensor can measure oxygen concentrations of 0.1% to 25% and 0.1% to 100%.

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TECHNICAL SPECIFICATIONS

Supply voltage
  RS485 output variant:8—28VDC
  Analogue output variants:20—28VDC
Supply current600mA max. at 24VDC
 1.2A max. at 12VDC
Digital outputRS485 (Modbus RTU)
 4—20mA; load 600Ω max
 0—10VDC; load 10kΩ min
Pump impedance at 700°C< 6kΩ
Permissible gas temperature-100°C to +250°C
Gas flow rate0—10m/s
Operating pressure limits260—1260mbar absolute
Mounting threadM18 x 1.5

OUTPUT VALUES

Oxygen range (analogue output)0.1—25% O2
 0.1—100% O2
Oxygen range (Modbus RTU)0.1—100% O2
Accuracy after calibration0.5% O2
Output resolution0.01% O2
Response time (10—90% step)< 4s
Initial warm up time (till stable output)5—10mins
Output inactive start up delay (heater warm up)
  From OFF to ON mode:60s
  From Standby to ON mode (RS485 only):20s

OUTLINE DRAWINGS

ELECTRICAL INTERFACE

PinAssignment
       RS485 VariantAnalogue Variant
1     Sensor Heater +Sensor Heater + (1)
2     Sensor Heater 0VDCSensor Heater 0VDC (2)
3     Sensor PumpSensor Pump
4     Sensor CommonSensor Common
5     Sensor SenseSensor Sense
6     8—28VDC20—28VDC
7     0Vdc0VDC
8     RS485 A (+)4—20mA or 0—10VDC
9     RS485 B (-)Calibrate IN/PWM OUT

FEATURES

  • Zirconium dioxide (ZrO2) sensor and OXY-LC sensor interface board
  • Screw mount sensor (M18 x 1.5) with 28mm, 45mm or 55mm length
  • Interface provides digital (RS485 or PWM) or analogue (4-20mA or 0-10Vdc) outputs
  • No need for temperature stabilisation
  • Integral heating element
  • Interface has built in pressure sensor
  • Reverse voltage and transient overvoltage protection

BENEFITS

  • Complete Oxygen Measuring System
  • Easy to install
  • To cover extensive application requirements
  • Accurate, fast response (standard <15s ; fast <4s)
  • Short warm-up time
  • For barometric pressure compensation
  • Robust electronics

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Application Notes

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