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8

Limiting Oxygen Index (Digital Flow)


Model Number: SSI 515 LOID

Standard Number: ASTM D 2863IS 13501

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 : Paramagnetic Dumb Bell Cell
Oxygen Readout : Digital, 0 to 100% , LC 0.1%
Temperature : Ambient to 400oC, LC 0.1oC
Total Gas Flow Indicator : Digital, 0-20 LPM, LC 0.1 LPM
Temperature Control : PID Controller, +/- 1oC
Gas Flow Control : Needle Valves
   
Power Requirement : 1.5 KW (with heaters)
Voltage : Single Phase 220 V AC, 50 Hz (110 V, 60 Hz model is also available on request)
Delivery : 3 to 4 weeks : 3 to 4 weeks
Packing  : Two Wooden Boxes (one for instrument and second for Glass Chimney) 
Alternate Model : SSI 515 LOI (with Rota meter for measuring  Total Gas Flow LC: 0.5 LPM)

Description

Instrument Principle

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.

In the limiting Oxygen Index Test Apparatus 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.

The Limiting Oxygen Index Test apparatus also has a double walled test column of flame resistance glass of 75 mm dia. 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 conforms to various other international standards.

Standard

The instrument conforms to ASTM D- 2863 and IS 13501.

Instrument

The Critical Limiting Oxygen Index Test instrument comprises of –

 

      Paramagnetic Dumb Bell Oxygen Analyzer. (Permanent Sensor)

     Double walled glass test column with two heaters, for sample heating and gas heating

     Digital Temperature indicating controller.  

     Flow meters and valves

     Readout for Oxygen: 0 to 100% Oxygen, LC: 0.1%

     Readout for Temperature  up to 400oC , LC : 0.1oC

     Digital Total Gas Flow Indicator : 0 to 20 LPM, LC: 0.1 LPM

     ‘L’ Shaped LPG Burner to ignite the sample

     Sample Holder and hanger

     ‘U’ shaped RTD PT 100 Temperature Sensor  

 

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.