First, the product introduction:
Asphalt flash point meter is a professional testing instrument for Cleveland Open Cup (COC) for determining the flash point and ignition point of viscous petroleum asphalt, coal tar pitch and liquid petroleum asphalt material with flash point above 79 °C to assess construction safety. use.
Second, technical parameters:
★Power supply: 220V±10% 50H
★ Ambient temperature: -10 ° C ~ 50 ° C
★ Relative humidity: ≤85%
★Automatic sweeping and ignition;
★ Electric furnace heating power 0~400W continuously adjustable;
★The heating wire is protected by transparent quartz tube, no open flame, explosion-proof, and the heating speed is fast;
Third, the installation and use:
★ Open the package and check the appearance of the instrument and related accessories according to the instrument package and technical documents. If there is no damage or missing, install it as shown in the structure diagram.
★ Check if the power supply is well grounded.
★ Turn on the power switch, the indicator light is on, and then the test operation can be performed.
★ Wash the sample cup with solvent, dry it, and install it on the stand.
★ Install the thermometer and insert the thermometer vertically into the sample cup. The mercury ball of the thermometer is about 6.5mm from the bottom of the cup, and the position is 16mm from the edge of the cup on the opposite side of the igniter.
★ After preparing the sample, inject it into the sample cup to the marking line, and make the other parts of the sample cup not contaminated with asphalt. (Note: The sample heating temperature should not exceed 55 ° C below the flash point)
★ All devices should be placed in a place where the room is dimly lit and there is no significant air circulation, and the wind screen is surrounded by three sides.
★ Connect the igniter to the flammable gas pressure vessel (such as liquefied propane gas or natural gas) with a hose, turn the igniter to one side, test the ignition, and debug the flame into a standard ball shape or a small sphere with a diameter of 4 mm ± 0.8 mm. Test the flame.
ourth, the test steps:
★ Start the heating test so that the heating rate quickly reaches 14 ° C / min ~ 17 ° C / min. When the sample temperature reaches 56 ° C before the expected flash point, the heater is adjusted to lower the temperature increase rate so that the temperature increase rate can be controlled at 5.5 ° C / min ± 0.5 ° C / min at 28 ° C before the expected flash point.
★ When the temperature of the sample reaches 28 °C before the expected flash point, press the igniter button once every 2 °C, so that the flame of the igniter is swept once along the center of the test cup with a radius of 150 mm, from the test cup. The time passed from one side to the other is about 1 second. At this point, it should be confirmed that the flame tester of the igniter is a fireball with a diameter of 4 mm ± 0.8 mm and is located 2.5 mm above the mouth of the test cup. (Note: The sample cup should not be exhaled during the test)
★ When the blue flame immediately disappears on the surface of the sample, immediately read the temperature from the thermometer as the flash point of the sample. Be careful not to mistake the blue-white flame around the flame for a flash point flame.
★ Continue heating, keep the sample heating rate 5.5 °C / min ± 0. 5 ° C / min, and use the igniter ignition test according to the above operation requirements.
★When the sample comes into contact with the flame and immediately catches fire, and can continue to burn for not less than 5s, stop heating and read the temperature on the thermometer as the ignition point of the sample.
★ The same sample is tested at least twice in parallel. The difference between the two determination results does not exceed the allowable difference of 8 °C in the repeatability test. The integer of the average value is taken as the test result.
★ Precision or tolerance:
The allowable difference of the repeatability test is: flash point 8 ° C, ignition point 8 ° C;
The allowable difference in the reproducibility test was: a flash point of 16 ° C and a flash point of 14 ° C.