1、 Purpose:

YYX-130A (improved version of TH-130)tilting micromanometerUsed to measure the positive and negative micropressure and pressure difference of various gases. The measurement range ranges from 0 to 1250Pa and there are nine specifications to choose from. It is a classic and cost-effective micro pressure measuring instrument. Widely used in coke ovens, various industrial kilns, heating and ventilation, environmental monitoring, scientific research and education, and other fields.

tilting micromanometerThe characteristics of the instrument are:

1. Stable and reliable work. Without complex and vulnerable components, without power or mechanical transmission, the measurement work is completed according to the principles of liquid statics. Almost no malfunctions;

2. High accuracy. We have selected an elongated and thickened Parex type glass graduated tube, which has been specially crafted to provide clear markings and highly sensitive flow of the working fluid, ensuring an accuracy of 1%. When using a range of 0-100Pa, the resolution can reach 1Pa;

3. It can be directly read on site without the need for multiplication factor conversion, as there are nine specifications and ranges to choose from;

4. Easy to install. This instrument is a hanging type, hung on the wall or equipment, and can be leveled. If it needs to be placed on a table or used for frequently moving measuring points, a small wooden rack can be self-made, and the instrument can be hung on it for use as a seat.

2、 Working principle and structure

1. Working principle (Figure 1)

This instrument uses the principle of liquid statics to measure the pressure of gas by utilizing the height difference of the liquid column. Its structure consists of a large box shaped positive pressure container connected to a slender glass inclined tube negative pressure container. The box contains liquid and is connected to positive pressure. One end of the inclined tube is connected to negative pressure, and under the action of external force, the liquid inside the box flows towards the inclined tube. Due to the much larger horizontal area of the liquid inside the box compared to the cross-sectional area of the inclined tube. Therefore, as long as there is a slight decrease in the liquid level inside the box, the inclined tube liquid column will rise significantly. By using the amplification principle of the inclined tube, the tiny pressure of the gas can be accurately measured.

This instrument has converted the pressure unit to Pa, so the scale readings of the tube are all in Pa.

The angle of the inclined tube of this instrument can be fully adjusted, so it can perform multi range measurements.

The instrument structure is shown in Figure 2 and Figure 3.

Front schematic diagram (Figure 2)

Back view (Figure 3)

1. Hanging control board (4 pieces) 2. Signage 3. Positive pressure valve 4. Negative pressure valve 5. Leveling 6. Connecting rubber hose 7. Curved groove

8. Add valve 9, arc-shaped scale plate 10, pointer plate 11, glass inclined tube 12, zero adjustment nut 13, casing 14, drain valve 15, connecting rubber hose 16, zero adjustment screw 17, positive pressure container

3、 Technical specifications

1. Measurement range 1~± 1250Pa

2. Accuracy level 1

3. By changing the tilt angle and selecting the corresponding measuring tube, the following ranges can be measured.

Increase by+50-250Pa

4. Working fluid: Alcohol at 20 ℃, γ=0.81 g/cm3

5. The main dimensions of the instrument are 480 × 390 × 120 (length × width × thickness mm)

6. Instrument weight 3.2 kilograms

7. Accessories for instruments

① One user manual

② One factory certificate of conformity

③ Add one working fluid tip bottle

④ Blow off one bubble hose

⑤ Three plastic valve sealing sleeves

4、 Installation and use of instruments

1. This instrument is installed vertically and suspended. The installation height should be convenient for observing instrument readings and fixed in a horizontal position. The distance from the measuring point to the instrument and the length of the connecting pipe should not exceed 3 meters. Instruments should be installed in environments with vibrations and bumps. If installation is necessary, shock absorbers must be installed.

All valve interfaces of this instrument have an outer diameter of 8mm and must be equipped with matching connecting rubber hoses.

2. Inject alcohol, open the injection valve, and slowly inject with a pointed tip. The quantity is about 100-150 milliliters. After filling, close the valve and cover it with a plastic sleeve to prevent dust from entering.

3. Adjust to 0 and remove the air inside the tube. The inclined tube points towards the highest pressure point, adjusts the alcohol to 0 o'clock, gently blows air into the positive pressure valve to raise the liquid column to the highest level, and allows the bubbles to overflow. Repeat this process multiple times until there are no more bubbles. At this point, 0 o'clock is the true 0 o'clock.

4. Measure pressure. Fix the inclined tube at the appropriate range. If measuring positive pressure, connect the hose to the positive pressure valve port and the other end to the measured point. The negative pressure valve is open to the atmosphere, and its liquid column number is the positive pressure number. If measuring negative pressure, connect the negative pressure valve to the measured point, and open the positive pressure valve to the atmosphere. If measuring the pressure difference between two points, connect the positive pressure valve and negative pressure valve to the high and low pressure ends of the measuring point respectively with hoses. The indicated scale is the pressure difference.

5. Reading. Our factory has eight types of graduated measuring tubes, and users can choose one according to their needs.

0-100020050010001250, ± 100, ± 250, ± 500 (Pa). The measured number can be directly read out, which is very convenient. If users need to set other ranges, they can multiply the correction factor based on this tube.

When this instrument leaves the factory, it has been adjusted and marked with red paint to indicate the points of each range. When in use, place the pointer on the red dot of the desired range.

6. Precautions for use

① When injecting alcohol into a positive pressure container, the amount should be appropriate. Too much or too little can affect regulation. If the positive pressure box is at a low position and the alcohol level still does not rise to 0, it indicates that it is too low and alcohol should be added. On the contrary, if there is too much alcohol.

② All connections of the instrument, including hoses and valves, must be tight and not leak air. Regularly check the rubber hose for looseness, bending, aging, and other phenomena, and promptly handle them to maintain the airtightness of the instrument. Otherwise, it will seriously affect the accuracy of the instrument and even make it unable to work.

③ The alcohol injected into the micropressure gauge should match the density of alcohol indicated on the instrument (γ=0.08). If they are not the same, they should be converted according to the following formula.

④ When the instrument is not in use, the positive and negative pressure valves can be closed to prevent alcohol evaporation. And all valves with exposed mouths should be covered with plastic sleeves to seal the mouths and prevent dust from entering.