Many car enthusiasts, faced with the need to check the condition of their wheels, ask the question: what is the name of the device for measuring tire pressure? The answer is simple, but hides a whole world of technical complexity and engineering solutions. This tool is pressure gauge, a device without which it is impossible to imagine competent operation of a modern car, be it a passenger car or a heavy truck.
In everyday life, we often hear the terms “tire check” or “wheel inflation”, but few people think about how critical the accuracy of the readings of the equipment used is. Exactly thyrometer or a tire pressure gauge allows you to get objective data on the condition of the air cushion that supports the weight of your car. Insufficient or excessive pressure can lead to serious consequences, including accidents.
In this article we will examine in detail not only the correct name of this device, but also consider its varieties, principles of operation and subtleties of choice. Understanding these nuances will help you maintain your car in perfect technical condition and save on fuel and tire replacement.
Main types of tire pressure gauges
There are many devices on the modern car accessories market, and they are all divided into several key categories based on their operating principle. The most common and classic option is considered mechanical pressure gauge. Inside such a device there is a sensitive element, which is deformed under the influence of air pressure, moving the needle along the scale. These are durable devices that do not require power, but they can be sensitive to shock.
The second popular type is electronic pressure gauges. They operate on batteries and display data on a digital display. The main advantage of such models is high accuracy and the ability to backlight, which is especially important in the dark. However, electronics are more vulnerable to changes in temperature and humidity than simple mechanics.
Third type - rack and pinion pressure gauges, which are often found in the form of keychains or pens. The principle of their operation is based on the movement of a calibrated spring, which pushes out a scale with divisions. They are compact, but less accurate and easy to use compared to the first two options.
- 🔧 Mechanical models are durable and are not afraid of frost, but require careful handling.
- 🔋 Electronic gadgets provide maximum accuracy up to hundredths of the atmosphere.
- 📏 Rack and pinion devices are compact and cheap, but have a high measurement error.
⚠️ Attention: When purchasing a mechanical pressure gauge, be sure to check the presence of a protective cap on the fitting. If dust and dirt get inside the mechanism, it will instantly damage the device or make its readings incorrect.
Units of measurement and instrument scales
When understanding what the tire pressure measuring device is called, one cannot ignore the issue of units of measurement. Different symbols can be found on the scales of different pressure gauges, and the ability to read them is a key driver skill. In Russia and the CIS countries, the standard is atmosphere (atm) or bar, which are almost equal to each other.
However, imported cars, especially American-made ones, often use the system PSI (pound-force per square inch). Confusion in these units can lead to serious errors when inflating tires. For example, a value of 30 PSI is approximately 2.0 atmospheres, and not 3.0, as it might seem to an inexperienced driver at a quick glance.
Many modern pressure gauges have a double scale, which greatly simplifies life for owners of different cars. It is also worth remembering that 1 Bar is approximately equal to 100 kilopascals (kPa), which is the SI unit of measurement. To accurately translate values, it is better to always have a table or an application on your smartphone at hand.
| Unit of measurement | Designation | Ratio to 1 Bar | Where is it used? |
|---|---|---|---|
| Bar | Bar | 1.0 | Europe, Russia |
| Atmosphere | atm | ~1.01 | Technical literature |
| PSI | psi | ~14.5 | USA, UK |
| Kilopascal | kPa | 100 | International standard |
It is important to understand that error measurements depend not only on the type of device, but also on the selected scale. On cheap models, the divisions may not be marked accurately, so for critical tasks, such as preparing for a long trip, it is better to use a certified tool.
Rules for accurate pressure measurement
In order for the pressure gauge readings to be reliable, it is necessary to follow a strict algorithm of actions. The main mistake many drivers make is trying to measure blood pressure immediately after active driving. As the tire moves, it heats up from friction with the road, and the air inside it expands, which leads to inflated figures.
Car manufacturers always indicate the recommended pressure for cold tires. This means that at least two to three hours must have passed since the last trip, or the car must have been parked in the shade. If you urgently need to check the pressure, 0.2-0.3 atmospheres should be added to the nominal value to compensate for heating.
☑️ Checklist for correct pressure check
The technique of pressing the device also matters. The pressure gauge must be held strictly perpendicular to the axis of the nipple, ensuring the tightness of the connection. If you hear air hissing during the measurement, the connection is leaking and the data will be incorrect. In this case, the procedure must be repeated by pressing the device harder or replacing the rubber seal on its rod.
⚠️ Attention: Never measure pressure on a dirty nipple. Sand and dust that gets inside the spool when pressed with a pressure gauge will lead to etching of the valve and permanent air leakage in the future.
The influence of temperature on pressure gauge readings
Physical laws are inexorable: the pressure of a gas directly depends on its temperature. This phenomenon, known as Gay-Lussac's law, plays a critical role in the operation of a car. In winter, with a sharp cold snap, tire pressure can drop by 0.2-0.4 atmospheres without any puncture, simply due to air compression.
Owners electronic pressure gauges They often notice that readings can “float” when moving from a warm garage to cold weather. Give the device and tire time to adapt to the environment. Ignoring the temperature coefficient is a common reason why the low pressure indicator comes on immediately after the start of winter cold.
How does temperature affect air volume?
For every 10 degrees Celsius change in temperature, the tire pressure changes by approximately 0.1 bar. This means that if you inflated the wheels in a warm garage (+20°C) to 2.2 Bar, then outside at -10°C the pressure gauge will show about 1.9 Bar, although the air has not escaped anywhere.
In summer, the situation is the opposite: long acceleration on the highway can heat the tires up to 60-70 degrees, which will raise the pressure by 0.3-0.5 atmospheres above normal. Therefore pressure control in summer it is especially important before long trips to avoid overheating of the rubber and its possible destruction.
Comparison of mechanics and electronics: what to choose?
The choice between an analog and digital device often becomes a dilemma for a car enthusiast. Mechanical models benefit in price and autonomy. They do not need batteries, they work in any frost, and their readings are easy to read in the usual way. However, over time, the spring in the mechanics can become “tired”, which will lead to loss of calibration.
Electronic pressure gauges offer functionality such as backlighting, audible signals, memory of the last value, and even connection to a smartphone. But they have a weak point - batteries. In extreme cold, batteries can quickly drain, leaving you without a tool at the most inopportune moment.
- ✅ Mechanics: reliable, cheap, not afraid of cold, but afraid of shocks and moisture.
- ✅ Electronics: accurate, functional, convenient at night, but dependent on batteries.
- ✅ Versatility: many modern compressors already have a built-in digital pressure gauge.
For everyday use in the garage, a mechanical pressure gauge is ideal, but for precise measurements and night trips it is better to have a compact electronic device in the glove compartment.
Professionals often advise having both types of devices in your arsenal. The mechanical one is used as the main and “reference” one for quick checks, and the electronic one is used for double-checking in doubtful situations or for fine-tuning the pressure in sports mode.
Typical errors when using the device
Even knowing the name of the tire pressure measuring device, many make basic mistakes that reduce the benefit of checking to zero. One of the most common is using a faulty or damaged tool. A mechanical pressure gauge dropped on the asphalt may show incorrect data, even if it looks intact on the outside.
Another common mistake is ignoring the condition of the nipple itself. If the spool in the wheel is “poisoned” or dirty, the pressure gauge will show the correct pressure only at the time of measurement, but immediately after disconnection the pressure will begin to drop. Always check the entire system for leaks.
Leak test:1. Inflate the tire to the correct level.
2. Wash the nipple with soap and water.
3. The absence of bubbles guarantees tightness.
Also, do not rely on “kicks” on the wheel or visual inspection. Modern low-profile tires can look absolutely normal even at critically low pressures. Only objective data Pressure gauges can give a real picture.
⚠️ Attention: Do not use the pressure gauge as a lever to unscrew a tight cap. This will lead to breakage of the measuring rod and disruption of the calibration of the device.
Frequently asked questions (FAQ)
How often should you check your tire pressure?
The optimal frequency is once every two weeks or before each long trip. It is also necessary to check when the season changes and there is a sudden change in air temperature.
Can the pressure gauge be used for other purposes?
The tire pressure gauge is calibrated for working with air at low pressure (up to 5-10 atmospheres). It cannot be used to measure the pressure of water in a water supply or gas in cylinders - this will lead to damage to the device.
Why does the pressure gauge show different values when taking repeated measurements?
This may be caused by a depressurized connection, a faulty spool, thermal expansion of air, or an internal malfunction of the device itself (for example, a sticking mechanism).
Do I need to calibrate my car pressure gauge?
Cheap models cannot be calibrated. Professional mechanical pressure gauges can be calibrated in specialized services by comparing their readings with a reference device.
What to do if the pressure gauge breaks?
If the glass of a mechanical device breaks, it cannot be used. If the electronic one is broken, try replacing the battery. In case of mechanical damage to the housing, it is easier to replace the device with a new one, since repairs are often unprofitable.