1、 Technical parameters

Dewey's DW254 series micro differential pressure transmitter application patent (utility model, patent number ZL.1) uses variable capacitance sensing technology with a large range span. DW254 utilizes its exclusively designed multifunctional and high-precision, high stability sensors to obtain accurate measurement values and on-site control in real time.

2、 Product Overview

The DW254 series micro differential pressure transmitter applies variable capacitance sensing technology, with a two-wire 4-20mA signal output and a minimum range of 0-25Pa. This MEMS sensor has strong sensitivity and long-term stability characteristics. Wall mounted and embedded installation are optional, complying with GMP standards for clean environments such as cleanrooms and operating rooms. The product is beautiful and elegant, with two relay signal outputs that can set alarm values arbitrarily. The ModBus RTU 485 signal output is convenient for networking, and the buzzer alarm is optional.

3、 Product Features

● Reverse wiring protection

●4～20mA、RS485、 Two relay signal outputs

●Realize low range and insensitivity to the measuring medium

●Adjust temperature drift point by point based on temperature changes

●Stable output at low range, unaffected by moisture and dust

●Compliant with cleanroom GMP standards and EU and US FDA standards

●On site calibration can increase the product's service life

4、 Technical parameters

●Accuracy: 0.8% F.S

Measurement medium: non corrosive gas

● Electrical connection: PG7 waterproof connector

Pressure connection: 1/8 "NPT

Pressure limit: 100KPa

● Working humidity: relative humidity is 0~100%

Working environment: -20~80 ℃

Power supply: DC 24V AC

Power consumption: maximum 50mA

5、 Widely used

Scenes such as pharmaceutical industry, electronic clean rooms, dust-free laboratories, biosafety laboratories, hospital negative pressure isolation wards, ICU intensive care units, operating rooms, negative pressure ambulances, biosafety cabinets, etc; Suitable for industries such as intelligent buildings, HVAC unit filter monitoring, VAV and fan control, machine room ventilation, fire exits, and furnace fan ventilation monitoring and control.

As an upgraded product of Dewey's intelligent instrument, the DW254 differential pressure transmitter customized for a certain equipment factory has been applied in some companies' on-site workshops. For example, a leader in the power battery industry has high requirements for process and precision measurement in the production of its main products. The solution to the control and recording of micro differential pressure in the furnace by the proprietary equipment of the roller kiln has always been a bottleneck problem that has not been perfectly solved for a long time. In the past, the traditional market used a combination mode of two instruments for separate control and recording, which has obvious drawbacks. Due to the attribute difference between the two instruments themselves, the consistency is poor and the equipment cost is relatively high.

Due to the high recognition of Dewey Intelligence's research and development capabilities in the industry, a certain equipment factory sought a solution from Dewey Intelligence. After on-site investigation and design ideas collision by Dewey Intelligence's technical team, a customized DW254 differential pressure transmitter was developed to solve the problem of dual signal transmission for an instrument in use.

The unique multi group signal superposition smoothing processing technology of Dewey Intelligence eliminates frequent jumping in instrument display and signal transmission, solving the original problems of observation and data recording. The dual output technology that combines digital and analog signals makes PLC control and upper computer recording more convenient, making data transmission more stable and fast. The carefully selected high-precision sensors and wide temperature compensation technology enable the instrument to operate stably even in harsh environments with high temperature and humidity. The solutions customized by Dewey Intelligence have received high recognition and praise from enterprises.

6、 Product advantages

Multiple standard signal outputs, along with one switch signal output. At low range, the output is stable, and moisture and gray layers have no effect. The large red LED display screen is clear even when viewed from a distance in relatively dark places. The product is embedded with a classic disc outer surface, and the white panel with black touch buttons is beautiful and elegant, with a strong international feel. Other companies that previously used circular differential pressure gauges can easily upgrade their usage scenarios because the exterior dimensions are completely the same. The product complies with cleanroom GMP standards and EU and US FDA standards, and can be calibrated for range and accuracy on site, increasing the product's service life.

DW254Differential pressure transmitterApplication site equipment

Integration of control and recording functions

DW254Differential pressure transmitteratMaintain stable work in harsh environments

DW254Differential pressure transmissionCentralized display and alarm of equipment in the clean area

• DW254 intelligent differential pressure transmitter. pdf
• Dewey DW254 Micro Differential Pressure Transmitter User Manual. pdf