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Limiting Oxygen Index

Limiting Oxygen Index


Model Number: SSI 515 LOIPM

Standard Number: ASTM D- 2863, IS 13501, BS 2782 Part 141, ISO: 4589-2ISO: 4589-3NES 714NES 715

Limiting Oxygen Index / Critical Limiting Oxygen Index apparatus is used for determining the minimum percentage of Oxygen required to just support flaming combustion of a material at room temperature in FTA mode or at Higher Temperature (up to 400oC) in HFTA mode

 

Salient Features  
   
Oxygen Analyzer : Paramagnatic Dumb Bell Cell
Oxygen Readout : Digital, 0 to 100% , LC 0.1%
Temperature : Ambient to 400oC, LC 0.1oC
Gas Flow Indicator : Analog using Roto meter, 0-24 LPM, LC 0.5 LPM
Temperature Control : PID Controller, +/- 1oC
Gas Flow Control : Needle Valves,
   
Delivery  : 3 to 4 weeks
Packing  : Two Wooden Boxes (one for instrument and second for Glass Chimney) 
   
Alternate Model : SSI 515 LOIPMD (with Paramagnetic Analyser and Digital Total Flow transmitter )
SSI 515 LOIPMH (with Paramagnetic Analyser and HMI Display)

Description

Instrument Principle

 

Limiting Oxygen Index / Critical Oxygen Index apparatus is used for determining the minimum percentage of Oxygen required to just support flaming combustion of a material at room temperature in FTA mode or at Higher Temperature (up to 400oC) in HFTA mode.

 

The sample is burned in the mixture of nitrogen and oxygen, and the percentage of oxygen required just to support the flaming combustion is recorded through an imported Oxygen Analyzer, which gives direct oxygen readings.

Limiting Oxygen Index apparatus also has a double walled test column of flame resistance glass of 75 mm diameter. suitable for testing different size of samples in FTA or HFTA mode.

A digital temperature-indicating controller provided with the instrument controls the temperature for HFTA mode. The instrument is manufactured as per the ASTM specification and also confirms various other international standards.

Standard

SSIPL Limiting Oxygen Index / Critical Oxygen Index conforms to ASTM D- 2863, BS 2782 Pt 141, IS 13501, ISO 4589-2, ISO 4589-3, NES 714 and NES 715.

 

Instrument

The Limiting Oxygen Index / Critical Oxygen Index instrument comprising of


    Paramagnetic Dumb Bell Oxygen Analyzer. (Permanent Sensor)
    Double walled glass test column with heaters.
     PID Temperature indicating controller.
    Flow meters and valves.
     Digital readout for Oxygen.
     Digital readout for Temperature.
     Roto meter for Gas Flow indication.
     L Shaped Burner for easy burning of samples.
     Sample Holder and hanger.
     ‘U’ Shaped Thermocouple to get the temperature at sample point.

The sample is ignited using the L shaped burner and oxygen % is adjusted till the sample starts to burn like a candle i.e. sustained burning without extinguishing or rapidly spreading the flame.  The Sample should burn in this condition for at least 3 mins. 

At higher temperature the requirement of Oxygen for combustion reduces. The environment around the sample is heated using double walled chimney with heaters for HFTA test. The procedure to determine the LOI remains the same as for ambient temperature. Reading are obtained for various temperatures and Oxygen % vs temperature graph is plotted.