Functions of Benchtop Multimeters for Pressure‑Sensor Applications
The sensor industry is widely recognized at home and abroad as a promising high‑technology industry. It attracts global attention for its high technical content, sound economic benefits, strong penetration capability and broad market prospects. Many manufacturers are facing new opportunities and challenges. Beijing Delwei Technology is willing to go through this process together with all manufacturers, enabling Fugui instruments to play an important role in this field. The following briefly introduces the application of Fugui benchtop multimeters in the pressure‑sensor sector.
About Sensors
A sensor is a device or apparatus that senses (or responds to) a specified measured quantity and converts it into a usable signal output according to certain rules. A sensor generally consists of a sensing element that directly responds to the measured quantity, a transducer element that generates usable signal output, and corresponding electronic circuits.
At present, the accuracy of most domestic pressure sensors is below 0.25 %, and their output is mainly 4‑20 mA current signals.
There are many types of pressure sensors, including resistance‑strain‑gauge pressure sensors, semiconductor‑strain‑gauge pressure sensors, piezoresistive pressure sensors, capacitive pressure sensors, piezoelectric pressure sensors, resonant pressure sensors and optical‑fiber pressure sensors.
Before delivery, pressure sensors must undergo strict quality verification to ensure they meet various user requirements and can adapt to diverse industrial‑site environments. There are multiple verification methods. This article mainly describes quality inspection using ESCORT Fugui benchtop multimeters.
Mainstream domestic pressure sensors require a voltage‑output resolution of 1 μV after signal conversion, which calls for at least a 5‑digit measuring instrument. The ESCORT‑3146A is a high‑accuracy 5½‑digit multimeter with 120 000 counts. Its DC voltage range (120 mV, accuracy: 0.012 % + 5 digits) is fully competent for sensor calibration in this procedure. For the 4‑20 mA current output from pressure sensors, the ESCORT‑3146A DC current range (12 mA, accuracy up to 0.05 %) together with the auto‑range function enables convenient measurement of such signals. The optimum resolution of its resistance measurement reaches 1 mΩ, which is more than sufficient for trimming resistance‑strain‑gauge resistance values. Its unique dual‑display function and high‑low limit alarm bring great convenience to production workflows.
It can be concluded that the ESCORT‑3146A fully satisfies production requirements for key verification steps of pressure sensors. Featuring excellent cost‑performance, it not only meets technical application demands but also helps manufacturers cut costs, making it an optimal choice for sensor manufacturers.
The Fugui benchtop multimeter ESCORT‑3136A is another high‑performance instrument available on the market. Boasting an optimum current resolution up to 10 nA (0.00000001 A) and a 4‑20 mA current percentage‑view function, it enables faster and more convenient testing of intelligent pressure transmitters.
