GB 26786-2011Specifications for the flame proof of industrial thermocouples and resistance thermometer sensors (English PDF)

4.1 Appearance and quality of assembly

4.1.1 Appearance

The outer surface of the junction box thermocouple and RTD should have the following signs.

a) in the junction box housing a prominent place should be set clear permanent earth Symbols "on";

b) a prominent place on the terminal box cover, should set clear permanent proof mark "Ex";

c) a prominent place on the terminal box cover, should be set to clear a permanent warning words "No live openings."

4.1.2 Assembly quality

Assembly quality thermocouple and RTD should meet the following requirements.

a) the parts assembled correctly, reliable connection parts no defect;

b) the nameplate is correct, reliable fixation; nameplate material chemically resistant materials should be used, such as bronze, brass or stainless steel.

4.2 Flameproof joint housing and the junction box cover and protection tube junction

Thermocouple and thermal resistance of the junction box housing and cover and protective tube with a flameproof joint connections shall comply with GB 3836.2-2000 the relevant requirements of Chapter 5.

4.3 Flameproof joint connection between the cavity and the main cavity

4.3.1 Spigot proof joints

Stop using the port flameproof joint shall comply with GB 3836.2-2000 concerning the 5.1,5.2.2,5.2.3,5.2.4,5.2.5,5.2.6 Claim.

4.3.2 Adhesive flameproof joint

Using adhesive flameproof joint shall comply with GB 3836.1-2000 in Chapters 12 and GB 3836.2-2000 in about 5.5 Claim.

4.4 converter with display with thermocouple and thermal resistance junction box display transparent pieces

4.4.1 Materials

Display transparent parts should be used to effectively withstand the highest temperature at rated conditions of glass material.

4.4.2 Install

Install glass transparent member shall comply with the relevant requirements of 8.2 in GB 3836.2-2000.

4.4.3 Impact

Transparent glass pieces after the impact test should not be any damage to the impact of the explosion-proof performance.

4.4.4 Thermal upheaval

Transparent glass member should be able to withstand drastic changes in the thermal test without cracking.

4.5 Thermocouple and thermal resistance junction box materials, impact and static pressure

4.5.1 Materials

Thermocouple and thermal resistance of the junction box should be used metal materials as a percentage by mass magnesium content of not more than 6%.

4.5.2 Impact

You should be able to withstand the impact test GB 3836.1-2000 defined in 23.4.3 any part of the terminal box or flat surface. test , It should not affect the performance of any explosion damage or deformation.

4.5.3 Static Pressure

Junction box should be able to withstand at least IIC level 1.5MPa, hydrostatic pressure test lasted within the 10s ~ 12s. After the test, may not affect the anti -any damage or deformation explosive properties.

Introduction means 4.6 Thermocouple wire cable and the thermal resistance of the cable Introducing means 4.6.1 thermocouple wire cable and the thermal resistance of the cable should meet the GB 3836.1-2000 in Chapters 16 and GB 3836.2-2000 the relevant requirements of Chapter 12.

4.6.2 When the installation of cables for the scene, which clamping nut entrance compensation should be made of wire or cable bell shape, its inner edge Smooth, see Appendix A in FIG A.1a), FIG A.1b) below.

4.6.3 When the installation site when using flexible connecting pipe explosion or steel wire, its clamping nut and explosion-proof flexible connecting pipe or pipe connections shall Number of not less than 5 buckle made of thread, as shown in Figure A.2.

4.6.4 seal compression nut on (see Appendix A in FIG A.1a), FIG A.1b) and Figure A.2) should be used after aging test after its hard 20% of the heat-resistant rubber does not exceed the amount of change in the degree IRHD aging test before.

4.7 Dynamic internal pressure and ignition are not booster

4.7.1 Dynamic pressure housing

Thermocouple and RTD should be able to withstand dynamic pressure test in GB shell of 15.1 3836.2-2000. After the test should not appear Explosion damage or affect the performance of permanent deformation.

4.7.2 No internal ignition booster

Internal thermocouple and RTD should conform to the provisions of 15.2 GB 3836.2-2000 not ignite the booster requirements.

4.8 Maximum surface exposed portions of thermocouples and RTD temperature

The maximum surface temperature of the exposed portion of the thermocouple and RTD should meet the requirements of 5.1.2 in GB 3836.1-2000.

4.9 RTD and thermocouple protection tube material and pressure

4.9.1 Materials

RTD and thermocouple protection tube should be made of stainless steel or other metal materials.

4.9.2 External pressure

RTD and thermocouple protection tube should be able to withstand the maximum working pressure of its products specified in the instructions of 1.5 times, which lasted 1min outer Hydrostatic testing, no water seepage and damage phenomenon.

4.9.3 Internal pressure

RTD and thermocouple protection tube should be able to withstand at least IIC level 1.5MPa, hydrostatic test period within the 10s ~ 12s. After the test, shall not affect the performance of any explosion damage or deformation.

4.10 Thermocouples and RTD fasteners

4.10.1 When the screw or bolt washers do not completely screwed into the hole, the thread should be left between the bottom of the tail of a screw or bolt and screw holes margin.

4.10.2 When using removable screw or bolt explosion-proof junction box housing, the screw or bolt holes should not penetrate the shell wall around the hole Metal thickness should not be less than one-third of the diameter of the holes, but at least 3mm.

Terminal Block thermocouple and thermal resistance of 4.11

4.11.1 Wiring seat conductive rod bolts or nuts, when the twisting force in line with GB 3836.1-2000 defined in 23.4.5 is applied Moments later, the conductive rod and wire holder should not be loose or turn.

4.11.2 Wiring seat between two different potential terminals, clearances between terminal and junction box housing and creepage distances shall not be less to 3mm.

4.11.3 Terminal Block comply with the relevant requirements of GB 3836.1-2000 in Chapter 7 and Appendix A of GB 3836.2-2000.

4.12 Grounding thermocouple and thermal resistance of the connecting member

On the junction box housing should be not less than the M4 grounding screw. For aluminum alloy or other light metal material of the junction box, Nuts should be made of copper alloy or stainless steel insert for the manufacture of the transition piece.

4.13 Thermocouple and thermal resistance with the enclosure class

Thermocouple and thermal resistance of protective enclosure shall not be less than GB 4208-2008 in IP54 protection requirements.

5.1 Appearance quality inspection and assembly

5.1.1 Appearance

Thermocouple and RTD appearance test by visual inspection.

5.1.2 Assembly quality

Thermocouple and RTD assembly quality inspection, should check pattern, check the component is assembled correctly, the connection is secure.

5.2 Flameproof joint housing and the junction box cover and protection tube junction

Flameproof joint housing and the junction box cover and protection tube junction thermocouple and RTD should check pattern control, use and flameproof Engaging surface structure corresponding measuring inspection.

5.3 Flameproof joint connection between the cavity and the main cavity

5.3.1 Port flameproof joint stop

Spigot should be flameproof joint control pattern with a micrometer and calipers to test its size; a standard roughness comparison model and flatness testing device Set to test its surface roughness and flatness of the flameproof joint.

5.3.2 Adhesive flameproof joint

Flameproof joint adhesive pattern control and glue should check the quality of its technical documents adhesive seal junction.

5.4 converter with display with thermocouple and thermal resistance junction box display transparent pieces

5.4.1 Materials

Glass transparent piece of material shall be provided by the manufacturer material valid documents to confirm.

5.4.2 Install

Transparent glass mounted in accordance with GB 3836.2-2000 inspection shall be in 8.2.1 and 8.2.2 requirements, control drawings, process documents and Physical inspection.

5.4.3 Impact

Impact test transparent glass member shall be conducted in accordance with the method specified in GB 3836.1-2000 in 23.4.3.1.

5.4.4 Thermal upheaval

Hot glass transparent member upheaval test shall be at the maximum operating temperature, with the temperature 10 °C ± 5 °C, a diameter of 1mm of its water injection.

5.5 RTD and thermocouple junction box materials, impact and static pressure

5.5.1 Materials

Material manufacturer shall thermocouple and thermal resistance junction box to provide material valid documents to confirm. The use of aluminum or other Light metal material, it must provide a single laboratory material composition or certificate.

5.5.2 Impact

Impact test thermocouple and thermal resistance junction box should be carried out according to the method specified in GB 3836.1-2000 in 23.4.3.1.

5.5.3 Static Pressure

With water at room temperature, according to the provisions of 4.5.3 the pressure was within the last 10s ~ 12s hydrostatic test for each terminal box.

5.6 Thermocouple wire cable and the thermal resistance of the cable glands

Introducing means 5.6.1 thermocouple wire cable and the thermal resistance of the cable should control pattern and physical inspection, and shall GB 3836.1-

2000 Appendix D of D3.1.1, D3.1.3 and D3.1.4 of test methods for clamping test; according to GB 3836.2-2000 Appendix D the D2.1.1 and D2.2 sealing test methods and mechanical strength tests.

5.6.2 of cables, should control the structure and shape of the entrance to Appendix A in Figure A.1a) and A.1b) test and the compression nut Inner edge smoothness.

5.6.3 explosion-proof flexible connecting pipe or steel pipe, should control Figure A.2 in Appendix A test structure and the compression nut connecting thread Number buckle.

Method D3.3 5.6.4 seal material hardness and aging shall GB 3836.1-2000 test prescribed in Appendix D test.

5.7 Dynamic internal pressure and ignition are not booster

5.7.1 Dynamic pressure housing

Shell dynamic pressure test thermocouple and thermal resistance shall be carried out in accordance with the requirements of 15.1.2.2 of GB 3836.2-2000.

5.7.2 No internal ignition booster

Internal thermocouple and thermal resistance of ignition shall not booster test in 15.2 GB 3836.2-2000 requirements.

5.8 Maximum surface exposed portions of thermocouples and RTD temperature

The maximum surface temperature of the thermocouple and thermal resistance of the exposed portion of the 23.4.6.1 according to the provisions of GB 3836.1-2000 test.

5.9 RTD and thermocouple protection tube material and the water pressure

5.9.1 Materials

RTD and thermocouple protection tube material manufacturer shall provide valid documents to confirm.

5.9.2 External pressure

With water at room temperature, according to 4.9.2 for each predetermined pressure to protect the outer tube of the pressure test lasted 1min.

5.9.3 Internal pressure

With water at room temperature, according to a predetermined pressure 4.9.3 for each period within the protection tube hydrostatic testing of 10s ~ 12s.

5.10 Thermocouples and RTD fasteners

5.10.1 control pattern with the appropriate balance between the left thread gages individually check screws and bolts tail.

5.10.2 control pattern with the corresponding measuring individually check the junction box housing does not penetrate the thickness around the screw holes.

Terminal Block thermocouple and thermal resistance of 5.11

5.11.1 Wiring seat conductive rod bolts or nuts, GB 3836.1-2000 moment in 23.4.5 shall be provided, with a torque wrench Hand torsion torque test.

5.11.2 Wiring seat between two different potential terminals and terminals with clearances between the junction box housing and creepage distances apply Vernier caliper test.

5.11.3 Terminal Block material manufacturer shall provide a valid proof to confirm, other properties should be GB 3836.2-2000 Appendix A predetermined test is performed.

5.12 Thermocouple and thermal resistance of the ground connection

Thermocouple and thermal resistance of the ground connection should control drawings and objects, in accordance with the relevant provisions of GB 3836.1-2000 into Chapter 15 Line test.

5.13 Thermocouples and RTD enclosure class

Shell protection grade test thermocouple and thermal resistance, the relevant requirements of GB 4208-2008 should be.

6.1 Explosion-proof certification and issuance of certificate

6.1.1 trial each unit according to the standard thermocouple and RTD, should be sent by the State Quality Supervision, Inspection department authorized for testing.

6.1.2 Sample inspection test report should provide the following.

a) test reports or quality of materials related materials guarantee;

b) junction box hydrostatic test report;

c) within the protective tube, the outer pressure test report;

d) basic product performance test report.

6.1.3 The test procedures shall comply with GB 3836.1-2000 Appendix A requirements.

6.2 Factory inspection

Each response thermocouple and RTD factory inspection and qualified along with product certificate before leaving the factory. Factory inspection There are any one of the results do not meet this standard, the product is defective and can not be shipped.

Factory inspection project, junction box cover flameproof joint, wiring cavity and the main cavity spigot flameproof joint, junction box hydrostatic testing, security Protective tube inner and outer pressure test shall be conducted prior to product assembly.

6.3 Type inspection

6.3.1 thermocouple and thermal resistance of various structures, there should be one of the following types of testing.

a) new product trial time;

b) when the normal production of products amounted to five years;

c) When the product structure, materials and technology have greatly changed;

d) the national quality supervision agencies carry out type testing requirements.

6.3.2 Type test sampling method using the factory inspection of a number of products at random no less than three thermocouple or RTD.

6.4 Test Project

Thermocouple and thermal resistance of factory inspection and type test items shown in Table 1.

Table 1 Thermocouple and RTD Inspection project

No. Inspection items Technical Requirements Test Method No. Terms Terms Factory test a type test

1 Appearance and assembly quality 4.1 5.1 * * 2 junction box with cover and protective tube connection flameproof joint 4.2 5.2 * * Flameproof joint between the junction box cavity 3 and the main chamber Mouth flameproof joint stop Adhesive flameproof joint 4.3.1 4.3.2 5.3.1 5.3.2 4 junction box display transparent parts Glass transparent piece of material Transparent glass mounting Transparent glass parts impact Transparent glass parts hot upheaval 4.4.1 4.4.2 4.4.3 4.4.4 5.4.1 5.4.2 5.4.3 5.4.4

Table 1 (continued)

No. Inspection items Technical Requirements Test Method No. Terms Terms Factory test a type test

5 Junction box material, impact testing, hydrostatic Junction box material Impact test Hydrostatic test 4.5.1 4.5.2 4.5.3 5.5.1 5.5.2 5.5.3 6 introduction means Clamping test, seal test, mechanical strength test Compression nut Seals 4.6.1 4.6.2 or 4.6.3 4.6.4 5.6.1 5.6.2 or 5.6.3 5.6.4