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Digital Pressure Gauge The Working Principle Of
- Sep 30, 2017 -

Digital pressure gauge combines world leading micro-processing technology and advanced module conversion algorithm to achieve high accuracy and low power consumption. Large screen LCD technology, unique background light technology, make the data can be read easily at night. With imported chip, the instrument data acquisition, memory, measurement and the maximum, manual zero. The shell is sealed with stainless steel, corrosion resistant and vibration resistant, can be used in a variety of complex environment.

The working principle of

Power part: ac 220 v after switching circuit, the dc voltage transform for), then through voltage supply circuit, or (24 v) dc voltage by the voltage regulator circuit supply circuit directly.

Signal parts: pressure measured medium, through the interface to the sensor of pressure sensitive film, pressure sensor, the electrical signal of induction by the amplifier, V/A conversion, the CPU for processing, set the display number, control switch output, and provides the analog or digital output so as to realize pressure display, control, and the process of transmitting.

Key technical indicators

Measurement range: -100 ~ 0 ~ 100kPa 0 ~ 0.1~ 60MPa

Accuracy: + 1, 0.5 FS

Sampling time: 1-5 seconds

Display: 4 LCDS

Power supply battery: 3.6V/2Ah industrial lithium battery 1, continuous use for 5 years

Environmental conditions: temperature: - 20 ~ 50 ℃ wet: 90% RH overload capacity: 200% FS

Connection thread: M20 x 1.5 or customized according to user's requirements


Shell material: 1C18Ni9Ti

Face plate: glass + inner PVC mask

Primer pipe material: 1C18Ni9Ti

Digital pressure gauge selection and use of cautions

Pressure gauges are common measuring instruments and are widely used in various fields. It can intuitively show the pressure change of each working procedure link, insight into formation conditions of the product or process of medium, monitoring safety trend, in the process of production and through automatic chain or sensing device, to construct a rapid and reliable security, to prevent accidents, played an important role in personal and property safety, is known as the "eyes" of safety.

(1) digital pressure gauges in the boiler, pressure vessel, the maximum range (the dial limit on the dial) shall be commensurate with the work pressure of the equipment. The range of the digital pressure gauge is generally 1. Five to three times, it's better to double it. If choose the digital pressure gauge measuring range is too big, because of the same precision digital pressure gauge, the range, the greater the permissible error of absolute value and the greater the deviation of macroscopic observation, will influence the accuracy of the pressure readings; On the other hand, the digital pressure gauge range is too small, if choose equipment work pressure is equal to or close to the digital pressure gauge calibration limit, can make the digital pressure gauge of the elastic elements in the largest deformation state for a long time, easy to produce permanent deformation, cause the error increase and reduce the service life of digital pressure gauge. In addition, the digital pressure gauge has a small range and overpressure runs, and the pointer over the maximum range is near zero, causing the operator to create delusions and cause even bigger accidents. Therefore, the pressure range of the digital pressure gauge shall not exceed 60 ~ 70% of the scale limit.

(2) the accuracy of the digital pressure gauge for work is expressed as a percentage of the limit value of the permissible error. The accuracy grade is usually marked on the dial, and the precision can be determined according to the pressure level of the equipment and the actual work needs when selecting the digital pressure gauge.

(3) the dial diameter in order to make the operator can see the pressure value accurately, digital pressure gauge dial diameter should not be too small, if digital pressure gauge is installed too high or far away from the post, dial diameter should be increased.

(4) digital pressure gauge is used to measure if the corrosive medium, so must according to the specific parameters such as temperature, concentration of corrosive medium to choose different elastic element material, otherwise can not reach the expected goal.

(5) daily attention to the use of maintenance, regular inspection, cleaning and good use of records.

(6) the general verification cycle of digital pressure gauges is half a year. The compulsory verification is the legal measure to guarantee the reliability of the technical performance of digital pressure gauges, accurately and effectively guarantee the safe production.

Use instructions and troubleshooting

1. This instrument is suitable for measuring the pressure of liquid, gas or steam without explosive danger, crystallization, non-congealed or weak corrosion.

2. The display part of the meter should avoid strong light irradiation, otherwise it will affect the life of the LCD screen.

3. Stability under pressure, this instrument can exceed limit the measurement used to less than 10%, but long-term outrange use may lead to damage of sensors, therefore, it is recommended to use with three-quarters of the upper limit value of the measured advisable.