What is a digital pressure gauge, and how does it work?
Key Takeaways
A Digital Pressure Gauge is a pressure measuring instrument that uses an electronic sensor to convert pressure into a number on a display. It is easier to read and free from the reading errors that affect needle gauges.
Industrial-grade models achieve accuracy of up to 0.05% of reading, while typical needle gauges are generally around 0.25%–1% of full scale.
When comparing specifications, check whether accuracy is stated as % of reading or % of full scale, because the two give very different results in low pressure ranges.
A single unit can cover multiple pressure ranges, replacing several test gauges.
Choose a model based on 5 factors: pressure range, accuracy, operating environment, connectivity, and calibration interval.
Calibrate at the interval recommended by the manufacturer, typically every 1–3 years.
In factories, power plants, petrochemical facilities, and machinery maintenance work, pressure accuracy is one of the most important concerns. A problem often encountered is that needle-type pressure gauges give inaccurate or imprecise readings. The basic workaround is to carry several pressure gauges, but this can slow down or complicate the work, since each gauge may support a different pressure range.
A tool that can help greatly is the Digital Pressure Gauge, a pressure gauge that shows readings as numbers, is easy to read, offers high accuracy, and in many models covers every pressure range in a single unit.
This article explains what a Digital Pressure Gauge is, how it works, its advantages over needle gauges, how to read accuracy specifications, and how to choose a model that suits your work.
What Is a Digital Pressure Gauge?
A Digital Pressure Gauge is a pressure measuring instrument that uses an electronic sensor to convert the pressure of a fluid (gas or liquid) into an electrical signal. The signal is then processed and shown as a number on the gauge’s display. This differs from needle gauges, which rely on mechanical movement.
Measured pressure is displayed in commonly used units such as psi, bar, kPa, and MPa, and most models let you switch units on the same device. This is convenient when working with standards or record-keeping documents that use different units.
How Does a Digital Pressure Gauge Work?
The working principle can be summarized in 4 steps:
Receiving pressure – Pressure from the system flows through the process connection into the sensor.
Converting to an electrical signal – The pressure sensor (for example, a piezoresistive or strain gauge type) deforms under pressure, causing its electrical properties to change.
Processing and compensation – Electronic circuitry converts the analog signal to digital and compensates for the effects of temperature so that readings remain stable.
Display – The value is shown on an LCD screen. Many models also offer a backlight, data logging, or wireless connectivity.
Advantages of a Digital Pressure Gauge Compared with a Needle Gauge
Easy to read, with no viewing-angle error – Readings are clear numbers, with no parallax error as with a needle.
Higher accuracy – Industrial-grade models achieve accuracy of up to 0.05% of reading, while typical needle gauges are generally around 0.25%–1% of full scale.
Multiple pressure ranges in one unit – One wide-range model can replace several test gauges.
Resistant to shock and overpressure – Field models are designed to withstand drops, vibration, and overpressure.
Data logging and transmission – Some models support USB, Bluetooth, and apps, so measurement results can be recorded and shared with the team instantly.
Calibration reminders – These help ensure you don’t miss a calibration interval, which is important for quality systems.
Types of Digital Pressure Gauges
Portable Digital Test Gauge – Used for field pressure checks and testing. Rugged and easy to carry.
Wireless Digital Pressure Gauge – Transmits data via Bluetooth to a mobile phone or the cloud. Suited to work that requires recording results and sharing data with a team.
Differential Pressure Gauge – Measures the pressure difference between two points, for example to check for clogged filters.
Panel Mount Digital Gauge – Permanently installed on a control panel and can replace needle gauges or analog pressure gauges.
Digital Manometer – For measuring very low pressure, such as roughly 30 psi and below.
Which Industries Use Digital Pressure Gauges?
Power plants and steam systems
Oil, gas, and petrochemical industries (intrinsically safe models are suitable for hazardous areas)
Marine and offshore work, which requires resistance to corrosion
Hydraulic and pneumatic systems
Calibration laboratories
Maintenance and inspection of machinery in general factories
Maintenance and Calibration
Although Digital Pressure Gauges are durable, measured values inevitably shift over time and with use (drift). You should therefore:
Calibrate at the interval recommended by the manufacturer – for example, every 1–3 years, depending on the model and frequency of use.
Use within the specified pressure and temperature ranges to prevent sensor damage.
Use protective accessories, such as a shock-resistant boot, and replace connection adapters when they wear out.
Keep calibration certificates as evidence for quality system audits.
If you would like experts to take care of this for you, see the Calibration Service from Analytical and Control Technology 2000.
Digital Pressure Gauges from Actcom2000
If you are looking for a high-quality Digital Pressure Gauge for industrial use, Analytical and Control Technology 2000 Co., Ltd. (Actcom2000) offers a range of digital pressure gauges to suit different applications, under the philosophy of “On Site, On Time, On Services.” See all products at Digital Pressure Gauges. Notable models include:
XP3i Wireless Digital Pressure Gauge – A new model measuring up to 15,000 psi, with a marine-grade, corrosion-resistant housing (MIL-STD 810). Accuracy remains unchanged across -20 to 50°C. Supports USB-C, Bluetooth, and a mobile app.
XP2i Digital Pressure Gauge – Rugged and intrinsically safe, measuring up to 15,000 psi. Suited to field testing and easy to use without complicated menus.
XP2i-DP Differential Pressure Gauge – Designed specifically for differential pressure measurement.
WT Series – Panel-mount gauges with accuracy of ±0.1% of reading and a measuring range from vacuum to 10,000 psi. Suitable for replacing older gauges.
m1 and m1M Digital Pressure Gauge – Accuracy of 0.2% and 0.25% of reading, large numeric display, backlight, and a battery that lasts up to 3 years of continuous operation.
In addition to pressure gauges, Actcom2000 is a distributor of measuring instruments and control systems from leading brands and also provides calibration services, so you can be confident that every pressure measurement is reliable.
Line: @Actcom2000
Tel: +66 2 944 4748
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