KEYILE科译勒 K-PR Explosion proof pressure transmitter

Working Principle

• Piezoresistive sensor: A piezoresistive sensor is a type of sensor that measures pressure by measuring the strain of a material. In the 2088 pressure transmitter, a metal thin film is usually used as the sensing element, with strain gauges attached to the film. When subjected to pressure, the metal film undergoes small strains, causing changes in the resistance value of the strain resistor.

• Bridge measurement: The transmitter is equipped with an internal bridge circuit, which organizes the strain gauges in the sensor into a bridge. When there is no pressure applied, the bridge is balanced and the output electrical signal is zero. When pressure is applied, the strain resistor changes, disrupting the balance of the bridge and causing the bridge to output a non-zero electrical signal.

• Signal amplification and conversion: The output small electrical signal is amplified by a signal amplification circuit to enhance the signal strength. Then, through the conversion from analog to digital, the analog signal is transformed into a digital signal for further processing and transmission.

• Temperature compensation: The 2088 pressure transmitter usually also has temperature compensation function to offset the influence of temperature on measurement. This can improve the stability and accuracy of the transmitter. 

Product Features

1. By adopting fully digital signal processing technology, the problems of electromagnetic interference and temperature drift in traditional analog signal processing have been eliminated, ensuring the accuracy and stability of measurement results.
2. Good stability: In harsh industrial environments, it exhibits good stability and can accurately monitor pressure changes for a long time.
3. Easy to install: Compact design, easy to install, adaptable to different installation scenarios and needs.
4. There are various output signals, including the most common 4-20mA two-wire current signal, as well as the three wire 0-10/20mA current signal and 0-5/10V voltage signal.
5. Overvoltage protection, when the on-site pressure value exceeds the range of the pressure transmitter, the power will be automatically disconnected to protect the system from damage.
6. Aluminum alloy die-casting shell, three end isolation, electrostatic spray protection layer, sturdy and durable. Multiple indicator heads such as LED and LCD make on-site reading very convenient.

Application Field

Petroleum Industry	Smelting	Environmentally Friendly Water Treatment	Chemical Industry	Construction Machinery Industry	Power Industry

Technical Specification

Product Structure And Isolation Diaphragm

1. Product Structure
		2. High quality stainless steel joint 316L stainless steel isolation diaphragm structure (customizable diaphragm material)
4. Customizable thread, interface size can be customized according to user requirements		3. High stability diffusion silicon pressure chip

Wiring Guide

4-20mA two-wire wiring diagram	Voltage output three wire system wiring diagram	RS485 output four wire wiring diagram

Instructions and wiring

1. Installation of pressure transmitter:

Ensure that the transmitter is installed perpendicular to the ground. During installation, the threaded type should be tightened with a wrench from the hexagonal bolt at the bottom of the transmitter to avoid direct rotation of the upper part of the transmitter; During the installation process of flange type, the force of bolts should be evenly distributed around to prevent irregular deformation of the sealing gasket. When measuring rapidly changing pressure, a pressure buffering device should be installed at the connection outlet between the controller and the measured medium to avoid instantaneous pulse high pressure directly impacting the measuring element of the transmitter, causing the transmitter to fail.

2. Installation of liquid level transmitter

Ensure that the transmitter is installed perpendicular to the ground. During installation, the threaded type should be tightened with a wrench from the hexagonal bolt at the bottom of the transmitter to avoid direct rotation of the upper part of the transmitter; During the installation process of flange type, the force of bolts should be evenly distributed around to prevent irregular deformation of the sealing gasket.

3. Installation of wind pressure transmitter

Wind pressure connection: Conventional 8mm inner diameter trachea (scald the trachea with hot water to make it more sealed) Pressure measurement: For positive pressure range (e.g. 0-1KPa), simply connect the longer end of the pagoda nozzle, and for negative pressure measurement, connect the shorter end of the pagoda nozzle; Negative pressure range (e.g. -5-0KPa) directly connected to the longer end of the pagoda mouth Differential pressure measurement: Connect the long pipe to the high pressure end and the short pipe to the low pressure end