GB/T 17650.2-1998 Test on gases evolved during combustion of materials from cables - Part 2: Determination of degree of acidity of gases by measuring pH and conductivity (English Version)
Test on gases evolved during combustion of materials from cables - Part 2: Determination of degree of acidity of gases by measuring pH and conductivity
1 Scope
Part 2 of this standard specifies a method for the determination of the degree of acidity of gases evolved during the combustion of compounds taken from the components of electric or optical cables.
Note 1: The relevant cable standard should indicate which components of the cable should be tested, and which method of calculation (see clause 8) should be used in the case of dispute.
Note 2: For the purposes of this standard the term “electric cable” covers all insulated metallic conductor cables used for the conveyance of energy or signals.
2 Principle of the Method
A pre-determined quantity of the test material is burned in a tube furnace. The evolved gases are trapped by bubbling through bottles filled with distilled or demineralized water.
The acidity is measured by determination of pH value. The conductivity of the solution is also measured.
3 Test Apparatus
The principle diagram of the apparatus is shown in Figures 1 to 5.
The assembly of the components which constitute the test apparatus shall be leak-tight. The connections between the tube and the first wash bottle and between the first and the second wash bottle shall be as short as possible.
3.1 Tube furnace
The effective length of the heating zone of the furnace shall be 500 mm to 600 mm and its inside diameter 40 mm to 60 mm. It shall be equipped with an adjusted electric heating system.
3.2 Tube
The furnace contains a fireproof tube made of silica resistant to the action of corrosive gases. The tube shall be approximately concentric to the tube furnace. The inside diameter of the silica tube shall be within the limits of 32 mm to 45 mm. The initial clearance shall only allow for thermal expansion. The tube protrudes on each side by a length L of:
— on the entrance side: 60 mm ≤ L ≤ 200 mm;
— on the exit side: 60 mm ≤ L ≤ 100 mm.
3.3 Combustion boats
1 Scope
2 Principle of the Method
3 Test Apparatus
4 Conditioning of the Samples
5 Test Pieces
6 Test Procedure
7 Determination of the pH Value and Conductivity
8 Expression of the Results
9 Recommended Values
GB/T 17650.2-1998 Test on gases evolved during combustion of materials from cables - Part 2: Determination of degree of acidity of gases by measuring pH and conductivity (English Version)
Standard No.
GB/T 17650.2-1998
Status
superseded
Language
English
File Format
PDF
Word Count
3000 words
Price(USD)
90.0
Implemented on
1999-10-1
Delivery
via email in 1 business day
Detail of GB/T 17650.2-1998
Standard No.
GB/T 17650.2-1998
English Name
Test on gases evolved during combustion of materials from cables - Part 2: Determination of degree of acidity of gases by measuring pH and conductivity
1 Scope
Part 2 of this standard specifies a method for the determination of the degree of acidity of gases evolved during the combustion of compounds taken from the components of electric or optical cables.
Note 1: The relevant cable standard should indicate which components of the cable should be tested, and which method of calculation (see clause 8) should be used in the case of dispute.
Note 2: For the purposes of this standard the term “electric cable” covers all insulated metallic conductor cables used for the conveyance of energy or signals.
2 Principle of the Method
A pre-determined quantity of the test material is burned in a tube furnace. The evolved gases are trapped by bubbling through bottles filled with distilled or demineralized water.
The acidity is measured by determination of pH value. The conductivity of the solution is also measured.
3 Test Apparatus
The principle diagram of the apparatus is shown in Figures 1 to 5.
The assembly of the components which constitute the test apparatus shall be leak-tight. The connections between the tube and the first wash bottle and between the first and the second wash bottle shall be as short as possible.
3.1 Tube furnace
The effective length of the heating zone of the furnace shall be 500 mm to 600 mm and its inside diameter 40 mm to 60 mm. It shall be equipped with an adjusted electric heating system.
3.2 Tube
The furnace contains a fireproof tube made of silica resistant to the action of corrosive gases. The tube shall be approximately concentric to the tube furnace. The inside diameter of the silica tube shall be within the limits of 32 mm to 45 mm. The initial clearance shall only allow for thermal expansion. The tube protrudes on each side by a length L of:
— on the entrance side: 60 mm ≤ L ≤ 200 mm;
— on the exit side: 60 mm ≤ L ≤ 100 mm.
3.3 Combustion boats
Contents of GB/T 17650.2-1998
1 Scope
2 Principle of the Method
3 Test Apparatus
4 Conditioning of the Samples
5 Test Pieces
6 Test Procedure
7 Determination of the pH Value and Conductivity
8 Expression of the Results
9 Recommended Values
