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       Material Testing Instruments
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33

Hot Set Apparatus (Dial Gauge Model)


Model Number: SSI 521 HSDG

Standard Number: IS; 7098 (Pt.1, 2 & 3)IS: 10810 (Pt. 30)

Laboratory Hot Set Test Apparatus is designed to determine the elongation & permanent set of insulation of armored and unarmored single, twin, three , four and multi-core cross linked Polyethylene (XLPE) insulated & PVC sheathed cables for electric supply and control purposes under specified conditions of load temperature and air flow.

 

 

Salient Features  
   
Chamber :  300 x 200 x 500 (LBH in mm)
Chamber Construction :  Double Walled, Inner Chamber made of Stainless Steel, Outer Chamber MS / GI
Temperature Range :  Ambient to 250oC. Test Temperature 200oC, LC 0.1oC
Temperature Control : Using PID Digital Temperature Controller, +/- 2
Samples :  2 Samples can be tested at one time
Weight :  2 Sets of Hanger and Weights are provided
Elongation Measurement :  2 Dial Gauges are provided to measure the sample Elongation
   
Delivery  : 3 to 4 weeks
Packing  : One Wooden Box
Alternate Models : SSI 521 HSSS (Hot Set with SS Scales for elongation measurement)
: SSI 521 HSVS (Hot Set with Vernier Caliper for elongation Measurement).
SSI 521 HSH (Hot Set with HMI / PLC Control)

Description

 

Instrument Principle

Laboratory Hot Set Test Apparatus is designed to determine the elongation & permanent set of insulation of armored and unarmored single, twin, three , four and multi-core cross linked Polyethylene (XLPE) insulated & PVC sheathed cables for electric supply and control purposes under specified conditions of load temperature and air flow, as specified in IS: 7098.

Standard

The instrument conforms IS 7098 (Pt.1, 2 & 3), IS: 10810 (Pt.30)

Instrument

     A double walled cabinet with inside chamber of stainless steel

    Inner dimensions of the chamber are 30 cm x 50 cm  20 cm (W x H x D).

    Full view glass Door to observe the specimen under test.

     Temp. Range 250 ± 2oC. at sensor point. 

    The oven is designed to give 8 to 20 air changes per hour.  

    An air flow meter (Rota meter) is fitted to control and monitor the airflow rate. Range 0- 10 LPM, LC-0.5 LPM

    Grips are provided at the top of the oven to hang specimen/s.

    Suitable weights up to 1 kg are provided with provision to attach the weights to one end of the test pieces.

    Two Dial Gauges with 50 mm travel are provided for elongation measurement

    Metallic are attached to facilitate the operator to take exact reading of the sample elongation.  

    A blade is provided in the oven to cut the sample to remove the tensile force without opening the door.

The sample is hanged using the grips inside the Hot Set Oven along with the weights for 15 mins. The sample starts to elongate due to heat. The elongation of the sample is measured using Dial Gauges. The sample is then cut to evaluate the permanent set. 

Hot Set apparatus (Open) Elongation Measurment system Sample Assembly
Extra Dummy Sample Grip Syatem Hanger with Weights

 

Difference between Hot Air Oven and Hot Set Oven

The test requirement is 8 to 20 air changes per hour, measured on a Flow Meter. According to IS standard, if the Oven does not have a regulated air supply, the oven is then termed as a Hot Air Oven and not a Hot Air Oven (as offered by some manufactures) and cannot be used for this kind of test

Also if normal oven is used for the test, the operator will have to open the front door to hang the samples, resulting in loss of temperature. As the test is only 15 mins, it will not be possible to regain the temperature. In our Hot Set oven, we use an especially designed Top Hanger which can be hanged from the top of the Hot Set Oven, without opening the front door. To achieve minimum loss of temperature, we provide two hanger assemblies. One is used as dummy that is used for achieving the desired temperature. In the meanwhile operator can assemble the sample, weights etc on the other hanger, which can be then put in the oven, just be replacing the dummy into the oven. This way the loss in temperature is not more than few degrees.

  • Air source to provide 8-20 air changes per hour, a compressor compressed air line of 4 to 10 liters min. is required. If this facility is not already available, a suitable air compressor may be purchased from us.
  • Sample Conditioning: The test specimens are required to be kept at a temperature of 27 ± 2 deg C for a period of 16 hours, immediately before the test. If the conditioning chamber is not available with you, the same can be purchased from us.