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       Material Testing Instruments
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Air-Oxygen

Air Oxygen Pressure Chamber


Model Number: SSI 519 AOPC

Standard Number: IS: 10810 (Pt.16), IS: 10810 (Pt.56), Appendix A of IS 6380 - 1984, IEC 60811-1-2

The Instruments is used for heat Ageing test under oxygen air pressure for insulation & sheath of electric cables. This apparatus is also used for estimating the relative resistance of vulcanized rubber to age determination by assessment of change in tensile strength & elongation of material by subjecting them to accelerated ageing in oxygenair pressure.

 

Salient Feature  
   
Chamber Size :  150mm (Dia) x 300mm (Height)
Chamber Construction :  Doubled Walled, Inner Chamber of 8-10 mm  wall thickness Seamless pipe. Outer MS / GI.
Heating :  Dry heating using Jacket Heater
Temperature Range :  Ambient to 200oC, LC 0.1oC
Temperature Control :  Digital PID Controller, +/- 1-2oC
Pressure :  0 to 22 kg/cm2, LC 0.1 kg/cm2
Pressure Control :  Using Digital indicating Controller
Safty :  3 Layered Safety for over pressure
   
Packing : One wooden Box
Delivery  : 4 to 6 Weeks
Alternate Model : SSI 519 AOPCH (Air Oxygen Pressure Chamber with HMI / PLC Control)

Description

Instrument Principle

The instrument is manufactured for Thermal Ageing test under oxygen air pressure for insulation & sheath of electric cables. This apparatus is also used for estimating the relative resistance of vulcanized rubber to age determination by assessment of change in tensile strength & elongation of material by subjecting them to accelerated ageing in oxygen air pressure.

Temperature Range : Ambient to 200oC

Pressure Range : 0-22 Kg/cm2 (0-2.2 Mpa)

Standard

The instrument conforms to IS: 10810 (Pt.16), IS: 10810 (Pt.56),  Appendix A of IS 6380 – 1984 and IEC 60811-1-2

 

Instrument

 

The instrument consist of the following :

     Inner chamber of seamless steel  pipe of at least 6 mm thickness

     SS lid and provision for placing the rubber test pieces,

     Pressure Control by Digital Pressure Controller

     Jacket Heaters outside the Inner Chamber

     PID Digital Temperature Indicating Controller , least count 0.1oC

     Pressure Gauge Digital (least count 0.1 kg/cm2, )

     Inlet,  outlet  for Air / Oxygen

     Safety valve (preset / sealed at 25 kg/cm2)

     Manifold with pressure switch, solenoid valve for compensating drop in pressure of gas from cylinders

     Power cord, extra seal, rubber pipe to connect bomb with cylinder

       

The sample is kept inside the pressure chamber under high temperature and pressure for the desired time period. After the

time period is over, the sample is tested visually for any creaks or deformations and also physical test are preformed like tensile

and elongation to determine the change as a result of ageing.


Safety Feature

 

The Chamber is designed with three safety devices for over shoot of pressure.

a) The input is regulated by digital pressure control which switch off the solenoid value once the desired pressure is reached.

b) A separate pressure switch with solenoid value is provided in series with the first solenoid value. The value of this pressure switch is set slightly higher than the set value, and will cut off the pressure if the digital pressure control fails.

c) A release value is provided on the top, set at ~25 kg/cm2 and will release the pressure if both the solenoid fails.