The operation process and data accuracy guarantee of the evaporation loss tester (such as the evaporation loss detection equipment for volatile substances such as fuel, solvents, chemicals, etc.) are key to ensuring the reliability of the test results. The following are general operating procedures and data accuracy assurance measures applicable to evaporation loss detection in laboratories or industrial sites.

1、 Operation process of evaporation loss meter:

1. Preparation work

Equipment inspection:

Confirm that the instrument model and range meet the testing requirements (such as evaporation loss rate range, temperature control range).

Check if sensors (such as pressure sensors, temperature sensors), seals, valves, etc. are functioning properly.

Calibrate instruments (such as weight method, volume method, or pressure method) to ensure accurate initial readings.

Sample preparation:

The sample should be evenly mixed to avoid layering or precipitation affecting the evaporation rate.

Fill the sample into the designated container (such as a standard can, beaker, or sealed chamber) according to standard requirements, and record the initial mass or volume.

Environmental control:

Set up a constant temperature environment (such as a water bath or a constant temperature box) to control temperature fluctuations within ± 0.5 ℃.

Avoid airflow interference (such as turning off ventilation equipment or using windproof covers).

2. Testing steps

Sealing and initial measurement:

Seal the container filled with samples and place it in the instrument, connecting pressure or weight sensors.

Record the initial parameters.

Start testing:

Select the mode according to the testing method (such as static evaporation, dynamic blowing):

Weight method: Real time monitoring of sample quality changes through weight loss sensors.

Pressure method: Monitor changes in steam pressure inside a sealed container through pressure sensors.

Volume method: Monitor the decrease in liquid volume through a liquid level sensor.

Set the testing time and data collection frequency (such as recording once per minute or every hour).

Data collection:

Continuously record the change curve of sample quality, pressure, or liquid level.

Observe and record environmental parameters such as temperature, humidity, and air pressure.

3. End the test

After the test is completed, turn off the instrument and save the data.

Check the sealing of the container to avoid residual sample leakage or contamination.

Clean the sensors and containers, and prepare for the next test.

2、 Measures to ensure the accuracy of data from evaporation loss meters:

1. Equipment calibration and maintenance

Regular calibration:

Calibrate sensors using standard weights (weight method), standard pressure sources (pressure method), or standard level gauges (volume method).

At least once a year, submit for inspection to the authorized institution.

Sealing inspection:

Before testing, use helium leak detection or vacuum pressurization method to check the sealing of the container to prevent gas leakage from causing errors.

2. Control of testing conditions

Constant temperature control:

Use high-precision temperature control equipment (such as water bath, constant temperature box) to control temperature fluctuations within ± 0.1 ℃.

Avoid temperature gradients (such as the temperature difference between the container wall and the sample) affecting the evaporation rate.

Avoid wind and light:

Use windproof covers or sealed chambers to reduce the impact of air flow on evaporation.

Take light avoidance measures (such as using brown containers) for photosensitive samples (such as certain chemicals).

3. Sample processing specifications

Uniformity guarantee:

Stir or shake the sample before testing to ensure uniform distribution of ingredients.

Avoid the formation of film on the surface of the sample (such as preheating oil and fat samples to above the melting point).

Blank control experiment:

Perform blank testing (without samples) using the same container and environmental conditions to eliminate the effects of container adsorption or background volatilization.