The Role of Bench Multimeters in Pressure Sensor Applications
The sensor industry is a high-tech sector recognized worldwide for its great development potential. It has attracted global attention for its high technological content, strong economic returns, high penetration capability, and broad market prospects. Many manufacturers are facing new opportunities and challenges. Beijing De'erwei Technology is willing to grow alongside manufacturers in this process, allowing Escort instruments to play an important role in this field. Below is a brief introduction to the application of Escort bench multimeters in pressure sensor applications.
About Sensors
A sensor is a device that detects (or responds to) a specified measured quantity and converts it into a usable output signal according to a certain rule. It usually consists of a sensing element that directly responds to the measurand, a conversion element that generates a usable signal output, and supporting electronic circuits.
At present, the accuracy of most domestic pressure sensors is below 0.25%, with 4–20 mA current as the main output form.
There are many types of pressure sensors, such as 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.
Strict quality testing is required before pressure sensors leave the factory to ensure they meet user requirements and perform reliably in industrial environments. There are various testing methods; this article focuses on quality inspection using ESCORT bench multimeters.
Mainstream domestic pressure sensors require a voltage resolution of 1 μV for their converted output signals, which demands a calibrating instrument of at least 5½ digits. The ESCORT‑3146A is a high‑precision 5½‑digit meter with 120,000 counts. Its DC voltage range (120 mV, accuracy 0.012% + 5) is fully capable of sensor calibration. For the 4–20 mA current output of pressure sensors, the ESCORT‑3146A's DC current range (12 mA, accuracy up to 0.05%) and auto‑range function enable convenient testing. Its best resistance resolution reaches 1 mΩ, which is more than sufficient for adjusting the resistance of strain gauges. The unique dual‑display and high/low limit alarm functions of the ESCORT‑3146A greatly improve efficiency in production.
It is clear that the ESCORT‑3146A fully meets production requirements for key testing procedures of pressure sensors. With its outstanding cost‑effectiveness, it satisfies technical applications while reducing costs for manufacturers, making it an ideal choice for sensor manufacturers.
The ESCORT‑3136A is also an excellent bench meter on the market. With a best current resolution of 10 nA (0.00000001 A) and a 4–20 mA current percentage display function, it allows faster and more convenient testing of intelligent pressure transmitters.
