1231 & 1232 In-Situ Oxygen Probes

1231 & 1232 In-Situ Oxygen Probes

In-situ Oxygen Analysis for Concentrations as low as 1×10-30% to 100%


The Novatech 1231 and 1232 Oxygen probes incorporate the world’s most rugged zirconia sensors. They are ideal for:

  • Flue gas analysis
  • Oxygen levels in boilers, kilns and furnaces
  • Combustibles analysis
  • Carbon potential measurement
  • Water vapour concentration and dew point measurement
  • Inert and sterile packaging
  • General industrial use
  • Annealing furnaces

The Novatech 1231 and 1232 Oxygen Probes are Australian-made and embody the research and development of one of Australia’s premier research organisations, the CSIRO. The Novatech 1231 and 1232 probes are highly accurate, and have minimal drift (±1%). The Novatech in-situ probes are highly durable; choose the Novatech 1231 for analysing gases with temperatures below 900ºC (1650ºF) and the Novatech 1232 for temperatures ranging between 700°C and 1400°C (1290ºF to 2550ºF).

The Novatech 1231 and 1232 probes have a very rapid response to changes in Oxygen levels

With a response time of less than 4 seconds, potentially hazardous situations such as those caused through the build-up of dangerous fuel-rich conditions can be avoided.

The Novatech 1231 and 1232 probes are easy to install

The probes are inserted into the flue, or other measuring point, and the threaded nipple (1231 has 1.5“ BSPT/NPT; 1232 has 3/4” BSPT/NPT) is screwed on to a mating socket welded to the process.

Connect the probe cable to the transmitter, and you are ready to measure and/or control the combustion process.

Sample Chamber for abrasive or corrosive processes

Certain processes, such as glass furnaces, ceramic furnaces or incinerators may contain highly corrosive particulate, abrasive or hostile compounds that will destroy any in-situ measuring device in short time.  By using a simple and inexpensive sample tube to extract a gas sample into a secondary sample chamber, accurate oxygen measurement can be achieved while reducing the exposure of the oxygen probe to the process environment.

For more information on our sample chamber, refer to the sample chamber data sheet

Novatech offers you safety of operation

The Novatech 1732 Oxygen Transmitter provides a main burner safety interlock. This is the ONLY reliable way of preventing potentially explosive situations.

Should the main burner fail or shut down then the sensor’s heater is de-energised so that dangerous flue gases cannot be ignited by the probe.

1231 Heated Probe 1232 Unheated Probe
Applications Combustion Flue gasses below 900°C (1650°F) Combustion flue gasses above 700°C (1290°F) with no contaminants;
eg natural gas, light oils
Range of Measurement 100% to 1×10-30 Oxygen
Temperature Range 0°C to 900°C  (32°F to 1650°F) 700°C to 1100°C 253MA Stainless Steel
(1290°F to 2010°F)
700°C to 1400°C Alumina Ceramic
(1290°F to 2550°F)
Process Pressure Range -50 kPa to 250 kPa
Probe Insertion Length Standard Lengths:
250, 350, 500, 750, 1000, 1500mm
(10”, 14”, 20”, 30”, 40”, 60”)
Standard Lengths:
500, 750, 1000mm
(20”, 30”, 40”)
Process Connection 1.5” BSPT or NPT 3/4” BSPT or NPT
Outer Sheath 32mm OD 316 Stainless Stell, or 42mm with optional filter 19mm OD 253MA Stainless Steel or Alumina Ceramic
Electrical Connection Weather-proof plug-in connector or optional screw terminals.
The plug connector can be supplied with the cable
Cable 1231 Cable can be supplied with a separate polyurethane reference airline
Heater Yes No
Internal Thermcouple Type ‘K’ Typically Type ‘R’.
Also available with no TC, Type ‘S’ or Type ‘K’
Response Time Typically <4 seconds Typically <1 second
Head Temperature -25°C to 100°C ( -15°F to 212°F) with standard terminations
-25°C to 150°C ( -15°F to 300°F) with optional ceramic terminal block
Reference Gas Air 50 cc/minute approx. Pump can be supplied within transmitter
Calibration Check Gas Flow Approx. 2 litres per minute
Reference Air Connection 1/4” tube Integral air line through connector or 1.4” tube
Particulate Filter Optional sintered titanium alloy
30 µm standard or 15µm extra fine
Not available
Calibration Check Gas Connection 1/8” NPT female 1/8” NPT female
Weight approx. 2Kg + 165g per 100mm insertion length.
Exact weight will vary depending on electrical terminations and filters.
approx. 1.1Kg + 65g per 100mm insertion length
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