Oxygen Analyzer for Built-in Packing Machine LF-200

The LF-200 zirconia oxygen analyzer was developed for automatic gas filling packaging equipment based on Toray Engineering's long track record with oxygen analyzers for the food packaging industry.
This analyzer is equipped with our unique, compact zirconia sensor to enable stable and highly accurate measurement over the long term, and an oxygen sensor protection mechanism for unprecedented durability. This is an easy to operate, compact oxygen analyzer which is ideal for integration into automatic packaging equipment for foods, pharmaceuticals and other products.


♦ Protection against oils
The system is equipped with a new type of filter to improve measurement of gases with dispersed oils. The filter can be replaced without removing the analyzer from the panel.
♦ Suction pump protection function
Enables pump protection while avoiding problems due to on-site cleaning caused by blowing air.
♦ High-speed response
Internal pipe flow which minimizes gas stagnation at points of measurement.
♦ Power supply
AC200V is provided standard, for ease of integration into packaging equipment (AC100V is optional).

Principle of Measurement

Toray zirconia oxygen analyzers determine oxygen concentration using the conductivity of a zirconia ceramic cell. Zirconia ceramic cells only allow oxygen ions to pass through at high temperatures. With reference gas on one side and sample gas on the other, oxygen ions move from the side with the highest concentration of oxygen to that with the lowest concentration. The movement of ions generates an EMF (Electro Motive Force) which can be measured to determine the oxygen content. This is in accordance with the Nernst equation.

LF-200 Internal Flow Diagram

LF-200 Internal Flow Diagram


Equipment Specifications

Type Panel-mounted (Portable type is optional)
Display system Digital 4-digit display (O2 concentration)
Measurement range 1 ppm-100 vol%O2
Display range 0-1000 ppm / 1 / 10 / 100 %, automatic
*The 1000 ppm range is not guaranteed
Output range 0-0.5 / 5 / 10 / 100 %, Fixed
Sampling system Two methods: continuous suction with a built-in pump, and injection
*Injection method is not guaranteed
Supply gas rate 1000 mL/min
Sensor gas rate 60 ± 10 mL/min
Gas connection INLET (Sample gas inlet): Rc1/8
BYPASS OUT (Bypass outlet): Rc1/4
OUTLET 1 (Sample gas outlet1): Rc1/4
OUTLET 2 (Sample gas outlet2): Rc1/4
Reference gas Air
Weight Approx. 7 kg
Paint color Front, back: Silver metallic
Cover: Stainless


Repeatability Within ±1 % of full scale (at or above 0-1 % range)
Within ±2 % of full scale (below 0-1 % range)
(0-1000 ppm is not guaranteed)
Air point stability Within ±0.5 % of full scale/24h
Measurement value output External output: DC 4-20 mA
Concentration alarm output LED display (Upper/Lower limit)
Contact output: 2a individual output
Contact: AC 30 V DC 30 V, 0.5 A
Self-diagnosis functions Warmup error, Thermocouple error
Internal temperature error
CPU error, Furnace temperature error
Asymmetry potential error, Sensor resistance error
AIR point calibration error
SPAN point calibration error
Sample gas conditions Must not contain flammable components, halogen, silica, corrosive components or water droplets.
Pressure: Pressurized at 0.03 MPa max.
Flow rate: 1,000-2,000 mL/min
Temperature: 50 °C max.
Humidity: Dew point lower than ambient temperature
Power supply Voltage: AC 200 V, Wired to terminal block
Frequency: 50/60 Hz
Set up conditions Set up location: Indoors, Non-explosion-proof zone
Ambient temperature: 0-40 °C
Ambient humidity: 45-85 %RH, No condensation
Equipment options Communication output (RS-232C compliant, unidirectional)
Activated carbon filter, Cotton filter
Power supply voltage AC 100 V

Engineering Specifications

LF-200 Engineering Specifications

Zirconia Oxygen Analyzer LF-200
Oxygen Analyzers
High/Medium Concentration Measurement Type LC-750H
Clean Gas Sampling Equipment Built-in Type LC-750H/PC-110
Dirty Gas Sampling Equipment Built-in Type LC-750H/PC-111
Medium/Low Concentration Measurement Type LC-750L
Clean Gas Sampling Equipment Built-in Type LC-750L/PC-120
Research/Experimental Use High Performance Type LC-850K, KS, KD
Research/Experimental Use High Performance Type LC-860
General-Purpose Type LC-300
Low Concentration Measurement General-Purpose Type LC-450D
Low Concentration Measurement General-Purpose Type LC-450A
Baking and N2 Reflow Use Analyzer RF-30
Baking and N2 Reflow Use RF-400
Separate Sensor Type vacuum deposition SW/LD-300
Oxygen Analyzer for Food Packaging LC-450F
Gas Flush Packaging Sampling Inspection Type LC-750F
Oxygen Analyzer for Built-in Packing Machine LF-200
Combustion Management Application Type SE-740/SE-740D
Relevant web pages
Principle of Measurement of Zirconia Oxygen Analyzers
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