Model Selection Guide

The table below provides a summary of recommended hardware for different oxygen measurement applications.

This table is available for download in PDF format

Type of Process or Appliance Usual Process Conditions Sensor Location(s) Measuring Range Models Used Comments
Boilers Package Combusted gas or fuel oil Flue 0.1 to 5% O₂ 1732 & 1231 Probe insertion length is usually 250mm
Power Generation Combusted Coal, dusty fly-ash Economiser Outlet 0.1 to 5% O₂ 1732, 1231 & FIL-2 If the probe can be mounted vertically downwards then filters are not required but the purge should still be used. Some fly-ash is abrasive.
Combusted Oil Economiser Outlet 0.1 to 5% O₂ 1732 & 1231 Don’t use filters with oil fired appliances
Combusted Wood Chips, ash Economiser Outlet 0.1 to 5% O₂ 1732, 1231 & FIL-2 Vertically down for the probe or else use filters; purge required
Black Liquor Recovery Combusted Black Liquor, dusty Economiser Outlet 0.1 to 5% O₂ 1732, 1231 & FIL-2 Large amounts of hydrated sodium sulphate & water vapour, use filters and purge (Na₂SO4 =90%; Na₂CO3 =10%) Dust Loading 5 to 15 g/Nm3
Iron & Steel Heating Furnace Combusted Gas Preheat, Heating & Soaking Zones 0.1 to 5% O₂ 1732, 1231 & S/Chamber Gas flow ˜ 5 lpm, back-purge required
Annealling Furnace H₂Nx (indirect fired) Base of Furnace 1 x 10-26 to 1 x 10-20% O₂ 1738 & 1231 4 – 5 years life at BlueScope Steel, Westernport works
Coke Oven Combusted Gas Flue 0.1 to 5% O₂ 1732 & 1231 Use filters if gas contains particulate
Soaking Pit Combusted Gas Before Recuperator 0.1 to 5% O₂ 1732 & 1231 Minimise ingot surface oxidation
Aluminium Potlines & Holding Furnace Hostile component – fluoride Sampling point from hood < 1% O₂ 1732, 1231 & S/Chamber Alco, Pt Henry, ˜ 5 year sensor life
Incinerators PVC Combusted Gas & HCl Sample point from after-burner outlet 0.1 to 5% O₂ 1732, 1231 & S/Chamber High HCl use condensate / acid trap before sample chamber
Medical or Toxic Waste Combusted Gas & hostile compounds Sample point at the final combustion chamber outlet 0.1 to 5% O₂ 1732, 1231 & S/Chamber Keep distance between sample point & chamber to a minimum to minimise transport lag time
High Temp Kilns / Furnaces Rotary Lime Combusted Gas Kiln end 0.1 to 5% O₂ 1732, 1231 & FIL-2 Probe location is critical; large amounts of abrasive dust and tramp air
Cement Combusted Gas (and sometimes rubber) Cyclone outlet 0.1 to 5% O₂ 1732, 1231 & FIL-2 Often used to incinerate rubber from spent vehicle tyres
Glass Combusted Gas (high silica) Sample point from kiln roof 0.1 to 5% O₂ 1732, 1231 & S/Chamber High silica destroys zirconia catalyst >800°C
Ceramic Combusted Gas (high glazing flux) Sample point from reduction firing zone < 1000ppm O₂ 1732, 1231 & S/Chamber Glazing salts are hostile to the sensor >800°C, sample tube between sample point & chamber require periodic replacement due to salts condensing in tube
Brick Combusted Gas (high glazing flux) Sample point from reduction firing zone(s) < 1000ppm O₂ 1732, 1231 & S/Chamber Same as ceramic kilns
Heat Treatment Sealed Quench Furnace CO / CO₂ (reducing) Side mount 0 to 1.5% Carbon 1734 & 1232 253MA Use purge to burn-out carbon build-up around the sensor
Rotary Furnace CO / CO₂ (reducing) End mount 0 to 1.5% Carbon 1734 & 1232 253MA These are usually “dirty” furnaces, use purge to burn-out carbon build-up around the sensor
Mesh Belt Furnace CO / CO₂ (reducing) Side mount 0 to 1.5% Carbon 1734 & 1232 253MA These are also usually “dirty” furnaces, use purge to burn-out carbon build-up around the sensor
Nitrogen Purity Generator Clean nitrogen Sample drawn from outlet < 100ppm O₂ 1732 & 1234 Use MOZ-1 for OEMs
Oxygen Enrichment Generator Oxygen & Nitrogen Sample drawn from outlet 90 to 95% O₂ 1732 & 1234 1234 must be degreased for pure oxygen service
Drying Ovens Direct Fired Water Vapour Side mount probe and sample tube 20 to 40% water vapour 1735, 1231 & RGS-01 Used in textile industry, gypsum dryers, paper machine drying hoods
Indirect Fired Water Vapour Side mount probe 20 to 40% water vapour 1735 & 1231
Baking Ovens Indirect Fired Water Vapour & fat Side mount probe 10 to 99% water vapour 1735 & 1231 Avoid direct jets of water on probe during wash-down
Food Packaging Food Packs – Spot Checks Clean gas Hypodermic with septum to sample package gas level 1 ppm to 5% O₂; 0-100% CO₂ 1637 Mk-II Use the white particulate filters if dust is present, use the blue filter to block water if droplets are in the work area or food pack, use septum to seal the hypodermic through the food pack.
Continuous Monitoring Clean gas Gas drawn from the packaging machine sample point 1 ppm to 5% O₂ 1732 & 1234 Use the activated carbon filter if hydrocarbons are present in the gas stream
Laboratory Use Clean gas Analyse take-up rate of CO₂ and O₂ permeation of package film 1 ppm to 5% O₂; 0-100% CO₂ 1637 Mk-II The instruments are well looked after in most of these facilities