Electric digital display low temperature compliance instrument installation and commissioning - Database & Sql Blog Articles

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1. Put the sink into the low temperature box and add the freezing liquid. Any mixture of frozen liquids:

—propylene glycol

/aqueous solution (volume ratio 1:1) as low as -25 ° C, or

- below

Ethanol/water mixture at -20 ° C (2:1 by volume).

Liquid level is

100mm, after the test piece has reached the specified temperature, it will remain at this temperature for 1h ± 5min.

2. Connect the host and controller lines, turn on the power supply 220V, and have reliable grounding. Turn on the power switch and adjust the bending axis position through the falling and stopping buttons on the control panel. Let the test piece be placed at the lowest end. The size of the test piece is (150±1) mm×(25±1)mm. Before starting all the tests, the distance between the two cylinders (see Figure 1) should be according to the test piece. Thickness adjustment, ie the diameter of the bending axis + 2 mm + the thickness of the test piece. The device was then placed in the cooled liquid and the upper end of the cylinder was about 10 mm below the surface of the frozen liquid, with the bending axis in the lower position.

The diameter of the bending axis can be different depending on the product.

20mm, 30mm, 50mm.

3. After completing the above work, set the required temperature in the first step. The second step sets the time required. The third step is to turn the switch to the up position and place the main unit in the low temperature box. That is, reaching the desired temperature and time, the bending axis automatically rises one experiment to complete.

Time setting: Set according to the constant temperature time required for material testing. That is, after reaching the set temperature, the test piece is lifted for a certain time delay.

4. Temperature setting: In the normal display state of SV/PV, press “SET” button to make the SV display flashing. Press “<” to find the number of digits of the desired temperature, then press up or The down button is set to the desired temperature value. After the setting is completed, press the “SET” button again to turn the meter to the SV/PV normal display state.

5. Use of clearing key: When the set temperature and time are reached, the bending axis is lifted upwards at a speed of 360mm/min in the bending axial direction, that is, one test is completed, press the down key to return it, press the clear Zero key to be tested next time.

6. After the set temperature is reached, the bending rod is automatically tested. In the 10S bending process, the test piece is visually inspected for cracks under a suitable light source, and if necessary, assisted by an auxiliary optical device. If one or more cracks penetrate from the coating layer to the carcass layer, or completely through the unreinforced coil, there is a crack. A group of five test pieces should be tested separately. If the size of the device is satisfactory, several sets of test pieces can be tested simultaneously. The range of cold bend temperature (unknown) was initially determined. Each test piece was tested every 6 ° C from the desired cold bend temperature, so each test temperature was a multiple of 6 ° C (eg -12 ° C, -18 ° C, -24 ° C, etc.). Starting from the lowest temperature at which the damage was caused, the upper and lower surfaces of each of the five test pieces were tested at intervals of 2 ° C, and the temperature was changed continuously every 2 ° C until at least 5 test pieces of each group were tested. 4 without cracks, this temperature is recorded as the cold bending temperature of the test piece.