OEM pressure transducer with analog output — LY Series

Description

Compared to other models that are not based on microprocessor compensation, the Y series converters have extremely low temperature error. This is achieved through an additional circuit containing a temperature sensor, which divides the entire temperature range into sections of 1.5 Kelvin (K). The zero TK and the compensation gain coefficient TK are calculated for each section according to a mathematical model and programmed into the additional circuit. These values are applied to adjust the analog signal during operation, depending on the temperature. Each temperature value is a "calibration temperature" for this converter. Their accuracy is mainly determined by a linear law.

In theory, up to 120 sections are available, which means a maximum temperature range of 180 K is available. The wider the temperature range, the more expensive the testing and calibration become, which must be carried out to minimize the errors of the mathematical model. Accuracy changes according to a linear law. Since typical nonlinearities of 0.2% FS are standard for modern pressure sensors, an error of 0.25% is achievable for a temperature range of 100 K! This represents a significant advancement compared to technology from 30 years ago, and importantly, the compensation values are supplied in parallel, which does not cause a drop in measurement frequency.

Calibration is performed at the factory in Switzerland, making it more efficient and more reliable:
Calibration and final verification are performed in a single operation in automated systems designed with modern technologies in mind. In these pressure/temperature calibration systems, the leads from the converters are placed into a connector on a PC board. Through an auxiliary PC connector, information about various pressures and temperatures is collected, correction values are calculated for each temperature section and for each converter, and recorded in the converter's memory, called EEPROM (Electrically Erasable Programmable Read-Only Memory) — electrically erasable programmable ROM, one type of non-volatile memory (such as PROM and EPROM). After this, the converter is considered fully programmed.

Data from the programmed converters are then checked at various pressures and temperatures using the same test setups or the same testing process and transmitted to the main computer. Data from each individual converter is displayed on the screen with predefined accuracy, instantly providing a complete picture of the unit's accuracy.

This information can also be sent to the customer. It is an invaluable tool for selecting the most suitable sensors for applications depending on requirements, particularly for OEM customers who use converters for a wide variety of purposes.

Features

• Nominal diameter less than 15 mm
• Factory calibration - manufacturer’s guarantee
• Flat open diaphragm made of stainless steel 316L
• Excellent resistance to electromagnetic interference
• Full scale ranges from 0...0.2 to 0...1000 bar
• Automatic temperature dependence correction