Many car enthusiasts, especially beginners, are wondering: what is the name of the device for measuring tire pressure? The correct answer is pressure gauge. This device is an integral part of the arsenal of any responsible driver, since driving safety, fuel consumption and tire wear directly depend on the correct tire pressure. Ignoring the readings of this small device can lead to serious consequences on the road.
In the modern world there are many modifications of this measuring equipment. They differ in operating principle, accuracy of readings, design features and price range. Understanding that how does a pressure gauge work and what types there are, will allow you to choose the ideal tool for your car. In this article we will analyze all the nuances in detail.
Incorrect tire pressure is not just an extra couple of liters of fuel consumed per hundred kilometers. This is a risk of aquaplaning, uneven tread wear and even cord breakage at high speed. Therefore, the knowledge how to use a pressure gauge, is a basic skill needed by every driver. Let's figure out what types of these devices exist and how they differ from each other.
Main types of automobile pressure gauges
All pressure measuring instruments can be classified according to the principle of their operation. Three main types dominate the market: mechanical, electronic and rack and pinion. Each has its own unique advantages and disadvantages that you need to consider when purchasing. The choice depends on how often you plan to take measurements and what accuracy you need.
Mechanical models are considered classics of the genre. They are reliable, do not require power and, as a rule, cost less than their electronic counterparts. Inside such a device there is a spring mechanism that responds to air pressure. However, it is worth remembering that over time the spring may become tired, which will lead to errors in measurements. Mechanical pressure gauge requires periodic verification of accuracy.
Electronic devices are becoming increasingly popular due to their high accuracy and ease of data reading. They are equipped with a digital display that clearly shows the current value. Such devices often have additional functionality, such as screen backlighting or the ability to switch units of measurement. Electronic pressure gauge requires batteries, which is its only weak point in conditions of long-term operation without replacing batteries.
⚠️ Attention: Not all cheap electronic pressure gauges work correctly at negative temperatures. The liquid crystal display may slow down or stop displaying data in extreme cold.
Mechanical pointer instruments
Dial pressure gauges are the most common type of device that can be found in garages and auto parts stores. Their popularity is due to their simplicity of design and durability. The main element here is a metal tube that bends under pressure, moving the needle along the scale. This is a time-tested technology.
The main advantage of such devices is their autonomy. You don't have to worry about running out of batteries at the most inopportune moment. In addition, mechanical pressure gauge usually has a durable case that protects the mechanism from shock and dust. Many models are equipped with a reset button or needle lock, which makes it easier to read the data after disconnecting from the nipple.
However, pointer instruments also have their disadvantages. First of all, it is sensitivity to vibrations. If there is constant shaking in the glove compartment or trunk, the mechanism may become loose, which will lead to an increase in error. Also, the scale may not be large enough, making it difficult to read in poor lighting or for people with low vision.
- 🛠️ Reliable spring design without complex electronics.
- 👁️ The presence of a scale with divisions, requiring careful visual control.
- 🔄 Possibility of calibration with a screw on the rear panel (in professional models).
- 📉 The average error is about 0.1–0.2 atmospheres.
When choosing a switch option, pay attention to the build quality of the case. Cheap models often have a plastic body that can crack if accidentally dropped. A metal case with a rubber protective cover will last much longer. Measurement accuracy in such devices directly depends on the quality of the internal components.
Digital electronic pressure gauges
Digital models represent the next evolutionary step in the development of measurement technology. They provide maximum accuracy and ease of use. Inside the housing there is a pressure sensor that converts the physical effect of air into an electrical signal displayed on the screen. This eliminates errors due to parallax (when the arrow is seen at the wrong angle).
One of the key features A digital pressure gauge is able to work in different units of measurement. You can switch between atmospheres (atm/bar), pounds per square inch (PSI) and kilopascals (kPa). This is especially useful if you travel by car abroad or use equipment with American pressure standards. In addition, many models have a function to remember the last reading.
Despite the obvious advantages, electronics have their limitations. Batteries can run out at the most inopportune moment, so it is always recommended to have a spare battery or a backup mechanical device. Also, digital devices are more sensitive to strong shocks and moisture getting inside the case. Electronic sensor requires careful handling.
Why may readings differ?
The difference in readings between a mechanical and electronic pressure gauge can reach 0.1-0.3 atm. This is due to the different inertia of the mechanisms. The electronics react instantly, while the needle takes time to reach the correct position. Always trust the more accurate electronic instrument, but check its calibration once a year.
Cap pressure indicators
Cap indicators deserve special attention. These are miniature devices that are screwed into the wheel nipple instead of standard caps. They do not require any action from the driver to check: just look at the color indicator or scale on the end of the cap. This is a solution for those who want constant visual control.
The principle of their operation is based on a spring-loaded mechanism with color indication. When the pressure is normal, a green color is visible. If the pressure drops, the spring is released and a yellow or red color appears to indicate a problem. Cap pressure gauge is more of an alarm system than a precise measuring instrument. It will not show you the exact value in atmospheres, but will immediately inform you of a critical change.
The main disadvantage of such devices is low accuracy and susceptibility to theft. They are easy to unscrew while the car is parked. In addition, they can “sour” due to dirt and reagents on the roads, ceasing to respond correctly to changes in pressure. However, as an additional security measure, they have a right to exist.
- 👀 Constant visual control without having to take out the device.
- 🎨 Color indication (green/yellow/red) for quick assessment.
- 🧵 Easy to install: screw in like a regular cap.
- 📉 Low accuracy and high risk of theft or contamination.
⚠️ Attention: Cap indicators do not replace a full check with a pressure gauge. They only signal a significant deviation from the norm, but do not allow the tire to be accurately inflated to the recommended value.
Comparison table of pressure gauge characteristics
To finally make a choice, let's compare the main parameters of different types of devices in a summary table. This will help you weigh the pros and cons before purchasing. Remember that the best device is the one you use regularly.
| Characteristics | Mechanical | Electronic | Cap |
|---|---|---|---|
| Accuracy | Average (±0.2 atm) | High (±0.05 atm) | Low (signal) |
| Food | Not required | Batteries (CR2032/AAA) | Not required |
| Impact resistance | High | Medium/Low | Average |
| Price | Available | Above average | Low (per set) |
| Add. functions | Reset button | Backlight, memory, flashlight | None |
For daily use and maximum accuracy, choose an electronic pressure gauge. For reliability and operation in extreme conditions - a high-quality mechanical device. Use caps only as an addition.
Instructions: how to measure pressure correctly
Knowing what the device for measuring tire pressure is called is only half the battle. It is important to know how to use it correctly in order to obtain reliable data. Errors in measurements can cost you safety on the road. Follow step by step instructions to get accurate results.
First of all, measurements must be carried out on “cold” tires. This means that the car must stand still for at least 2-3 hours, or drive no more than 2-3 kilometers at low speed. When driving, the tire heats up, the air inside expands, and the pressure increases. Hot measurement will give falsely high values.
The measurement process is as follows:
1. Remove the protective cap from the wheel valve.
2. Press the pressure gauge firmly against the end of the nipple.
3. Wait until the readings stabilize (the arrow or numbers stop).
4. Record the value and disconnect the device.
5. If necessary, pump up the wheel and check again.
☑️ Correct pressure check
Pay attention to the tightness of the connection. If you hear a strong hiss of air during measurement, it means that the pressure gauge is not pressed tightly or the rubber seal of the device is worn out. In this case, the readings will be incorrect. It is also recommended to take measurements at air temperatures above -10°C, since in severe frost the properties of rubber and metal change.
Always carry a compact pressure gauge in your glove compartment. Stationary pressure gauges at gas stations are often broken, have a large error, or do not work at all.
Instrument calibration and maintenance
Any measuring instrument begins to “lie” over time. Mechanical gauges are subject to spring fatigue, and electronic gauges can lose sensor calibration. Therefore, regularly checking the accuracy of your device is a must for a responsible driver. Without this, all your actions to inflate tires are meaningless.
Check pressure gauge calibration possible in several ways. The simplest is to compare the readings from your gauge to those of a known good, accurate reference pressure gauge on the same tire. If the difference is significant (more than 0.1–0.2 atm), the device cannot be used. Some mechanical models have an adjustment screw that allows you to return the needle to zero or adjust the readings.
For electronic devices, home calibration is usually not possible unless the instructions provide for it (for example, a factory reset). If your electronic device begins to show obvious incorrect information, it will likely need to be replaced. Careful storage in a case and protection from moisture will extend the life of any device.
⚠️ Attention: Never drop the pressure gauge from a height. An impact may disrupt the geometry of the measuring spring or damage the sensitive sensor, rendering the instrument useless.
Why is it important to monitor your blood pressure regularly?
Regular monitoring is the key to the longevity of your tires and safety. Underinflated tires lead to an increase in the contact patch, overheating of the sidewalls and rapid wear of the shoulder areas of the tread. Over-inflated tires, in turn, make the car stiff, reduce traction and lead to wear on the center tread. Optimal pressure is a balance between comfort and efficiency.
In addition, the correct pressure affects the braking distance. At low pressure, the car reacts worse to steering commands, and the braking distance can increase by several meters, which becomes a critical factor at high speed. It is also worth remembering that when the ambient temperature changes by 10 degrees Celsius, the tire pressure changes by approximately 0.1 atmosphere.
In winter, you need to check the pressure more often, since temperature changes are sharper. In the summer, monitor your pressure before long trips, when you are expected to drive at high speeds and fully load the car. Pressure control - This is the simplest and cheapest prevention of many car problems.
How often should you check your tire pressure?
It is recommended to check your blood pressure at least once a month and before every long trip. In winter, the frequency of checks should be increased to once every two weeks due to temperature changes. It is also necessary to check during a sudden cold snap.
Where can I find the correct pressure for my car?
Information about the recommended tire pressure is located on a special sticker. It is usually located on the driver's side B-pillar (visible when the door is open), on the inside of the gas filler flap, or in the vehicle's owner's manual. It shows values for different loads and tire sizes.
Can the pressure gauge show different pressures on the same tire when measured repeatedly?
Yes, this is possible. Reasons: insufficient time to stabilize the readings, loose fit of the device to the nipple, difference in air temperature inside the tire (if the wheel was spun between measurements) or poor quality of the device itself with high inertia.
How is tire pressure measured in Russia?
In Russia and most CIS countries, the main unit of measurement is atmosphere (atm) or bar (bar). Technically, 1 bar ≈ 1.0197 atm, but in everyday life these values are neglected, considering them equal. Also commonly found are PSI (pound-force per square inch) values, which are typical for American cars.