Calcium carbide (calcium carbide) (3)

4.

4.

The water and auxiliary equipment needed for the calibration, such as thermometer, bottom bottle, glass tube, rubber tube and rubber stopper, etc.

4.

Open the exhaust valve to make the gas meter communicate with the atmosphere, pull down the counterweight to make the pointer rise to two-thirds of the scale, close the exhaust valve to make the gas meter communicate with the standard device, and adjust the counterweight so that A positive pressure difference of about 0.

4.

Calibration can be performed only when the temperature in the gas meter and the water temperature of the standard device are not more than 1 ℃ between the temperature in the calibration chamber

4.

The gas output is measured in the measuring device shown in Figure 1.

4.

Gas output (G), the value is expressed in liters per kilogram (L/kg), calculated according to formula (1):

Where:

a—Gas meter calibration value, the unit is liter per kilogram millimeter [1.

p—The value of atmospheric pressure.

P'―Find out the value of the steam pressure of saturated brine at t℃ according to Table 3, in kilopascals (kPs);

h—The reading on the scale of the gas meter, in millimeters (mm);

t—Determine the value of the temperature inside the clock cover, in degrees Celsius (°C)

Take the arithmetic mean of the results of two parallel determinations as the determination results, and the absolute difference between the results of the two parallel determinations is not more than 4L/kg

Table 2 Steam pressure of saturated brine at different temperatures

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