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What is a manometer
Automobile pressure gauge — a device for measuring pressure in automobile tires. In special equipment, pressure gauges are regularly used as a measurement of oil pressure and brake cylinders. Let’s take a closer look at tire pressure gauges.
During operation, vehicle tires lose pressure for various reasons, which leads to a deterioration in driving performance and danger when driving. The difference in pressure between the tires «by eye» is impossible to determine, so we need a pressure gauge for accurate measurement.
What does it show and what does it measure?
A car pressure gauge is a device that shows the density of air inside a tire. The unit of measurement is kgf / cm² or Bar (Bar). Also, the measuring device can be used to measure the pressure in the air suspension cylinders. Ready-made pneuma kits are often equipped with pointer instruments from a KamAZ vehicle, since it has a mechanical pointer device that shows pressure up to 10 atmospheres and is distinguished by its accuracy. The principle of operation of the pressure gauge for tires and air suspension is the same, since they work on the same principle.
What is a manometer for? First of all, for safety. In previous articles, we touched on the topic of tire pressure difference, and what it leads to (uneven tire wear, increased traffic hazard, increased fuel consumption). Often the device is integrated into the pump, whether it be mechanical or electrical, but to read tire pressure, the pump must be securely attached to the valve, which is completely inconvenient.
What does it consist of?
The simplest mechanical pressure gauge consists of:
- corps;
- Bourdon tubes or membranes;
- arrows;
- tubes;
- fitting.
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Operating principle
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The simplest mechanical pressure gauge works as follows: the main part is the Bourdon tube, which, when air pressure is injected, moves the arrow. When connected to a valve, air pressure acts on the brass tube, which tends to unbend, due to which the other end of the tube acts on the rod, moving the arrow. A similar principle of operation applies to the diaphragm pressure gauge.
An electronic pressure gauge is more complex, a sensitive element is used as a meter, the readings of which are transmitted to the electronic board, then to the display.
Types of pressure gauges
Today there are three types of automotive pressure gauges:
- mechanical;
- rack;
- digital.
Mechanical. The peculiarity of such pressure gauges is their simple design and reliability. The cost of the device is low, relative to rack and digital devices. The main advantage is an instant and accurate reading of pressure, the availability of the device (sold in every auto shop), as well as reliability. The only downside is moisture sensitivity.
Some mechanical pressure gauges not only show pressure, but allow you to release excess air to achieve the required readings. To do this, a pressure release button is located on the pressure gauge tube.
It is recommended to purchase more expensive models with a metal case, which are distinguished by clear and correct indicators.
Rack. The body can be plastic or metal, the fitting is integrated into the body or there is a flexible hose of about 30 cm. The principle of operation is similar to a mechanical pressure gauge, the cost is the same, but the body is often prone to damage.
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Digital. It is convenient in that it shows the pressure value to hundredths. It differs in clearer readings, there is a display backlight, however, in winter, the device may give values with errors. The electronic pressure gauge is the most compact, but the plastic case requires careful use, otherwise there is a risk of crushing the case.
Benefits of working with pressure gauges
What is a manometer for? First of all, it is an indispensable assistant for every car enthusiast, especially for those who often use the vehicle for driving on sand and off-road, where pressure relief or pumping is required.
How to use a manometer? Quite simply: you need to insert the fitting into the tire valve, after which the arrow of the device will show the real pressure. The digital device must first be turned on. By the way, in order not to constantly check tire inflation, there are special valves with pressure sensors. The simplest sensors are equipped with nipples with three-color divisions: green — pressure is normal, yellow — requires pumping, red — the tire is flat.
There are also ready-made systems with an LCD display that is installed in the cabin, notifying 24/7 about the status of tire pressure. Most modern cars are already equipped with a standard tire pressure information system, and SUVs with a function of pumping or depressurizing. One way or another, having a pressure gauge with you is extremely important, since the correct tire pressure is the key to safe and comfortable driving.
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