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.

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.

Measuring Range 1 ppm to 100% oxygen
Sensor Output EMF = 2.154 × 10⁻² × T × logₑ(0.209 / oxygen level)
Response Time • 1234C : 5 seconds with a gas flow of 2 litres / min
• 1234E : 3 seconds with flows from 0.5 to 25 litres / min
• 1234M : 3 secs with flows from 0.1 to 0.5 litres / min
Accuracy ±1% of actual reading
Thermocouple Type K
Warm Up Time Seven to ten minutes
Heater Power 110VAC, 50/60 Hz, 115Watts
Flow Rate Range 0.1 to 25 litres / min
Gas Connection 1/4” tube inlet and outlet (1/8″ tube outlet for 1234C)
Sample Aspiration Convection flow from hot furnace or flue, from process pressure, electric pump or air operated ejector (for 1234E model only).
Environmental Non weather proof cabinet. If mounting outdoors, a weather-hood is required for electrical protection.
Do not enclose in sealed cabinet or overheating may occur. Your cabinet should be vented.
Ambient Temperature 0°C to 100°C,(32°F to 212°F)
Weight 2.2 Kg
Dimensions 300 mm x 125 mm x 88 mm
(11.4″ x 4.9″ x 3.5″)
Optional Sample Pump External electrical diaphragm pump, 240 / 110 VAC, or air operated ejector, 30 to 100 kPa
Optional Process
Sampling Tube,
Filter and Bush
Stainless steel filter, 500ºC max. Process connection bush 1.5” BSP or NPT to 3/8” tube. (3/8”, 16 gauge tube supplied by others)
Mounting Vertical surface mount, brackets supplied
Ordering Information • 1234C If sample is delivered from process or pump
• 1234E If sample is drawn from the outlet by suction, specify mains voltage on 1234E, 240V or 110V
• 1234M For low flow rate requirement
Accessories • Integral electric pump and filter assembly MV-10F (fitted on top of your 1234 sensor)
• Air operated ejector (for 1234E model only)
• Sampling probe filter and bush, tube by others
• Filters for dry dust, wet dust or hydrocarbons
• Flow meter