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The Core of High Vacuum and Precise Negative Pressure Control: In-Depth Overview of WH131-FY Series Transmitter
In fields such as precision manufacturing, chemical processes, and semiconductor packaging, the stability of negative pressure (vacuum) environments directly determines the qualification rate of process products. For system integrators and engineering project contractors, finding a transmitter that can adapt to complex physical installation environments while maintaining high linearity and long-term stability in low-pressure ranges (such as -1 kPa level) is crucial.
The Nexisense WH131-FY series negative pressure transmitter is a professional-grade sensing terminal developed precisely to meet this demand. By introducing advanced sensing chip technology and structural design optimized for negative pressure environments, WH131-FY provides extremely strong system adaptability while ensuring measurement accuracy.
Sensing Architecture: Silicon Piezoresistive Intelligent Chip and Three-Stage Temperature Compensation
The technical core of WH131-FY lies in its Nexisense intelligent sensing chip. Compared with traditional thick-film resistor or capacitive structures, this chip has a higher sensitivity coefficient and can capture extremely weak pressure fluctuations.
High precision level: The product supports 0.25-level metrological detection accuracy, ensuring true restoration of data during edge-side acquisition.
Three-stage temperature compensation process: In response to drastic fluctuations in ambient temperature at industrial sites, Nexisense adopts three processes — hardware circuit compensation, firmware algorithm correction, and full-temperature-range laser debugging — reducing the impact of temperature drift by 35% and ensuring that the sensor maintains consistent output curves in environments from -40℃ to 85℃.
Anti-interference ring module: Built-in anti-electromagnetic interference (EMI) ring, targeted shielding against electromagnetic radiation generated by industrial frequency converters and high-power motors, improving electromagnetic interference resistance by more than 75%.
Technical Specifications and Integration Parameter Table
To facilitate electrical matching and mechanical structure design for system designers, the core parameters of the WH131-FY series are organized as follows:
| Technical Parameter Item | Specification Description | Remarks |
|---|---|---|
| Product Model | WH131-FY | Negative pressure professional version |
| Range Coverage | -100 kPa ~ 0 ~ -1 kPa (and composite ranges) | Supports micro negative pressure customization |
| Measurement Accuracy | ±0.25% FS / ±0.1% FS (custom) | Typical value 0.25 level |
| Output Signal | 4-20mA / 0-5V / 0-10V | Standard analog signal |
| Power Supply | 12VDC - 36VDC | Commonly 24VDC |
| Response Time | ≤ 8ms | Instantaneous dynamic response |
| Protection Rating | IP65 (Hirschmann) / IP68 (waterproof type) | Supports normal use underwater up to 200 meters |
| Pressure Connection | M20*1.5, G1/2, G1/4, KF16 clamp | 304/316L stainless steel material |
| Electrical Connection | Hirschmann connector / direct lead / on-site digital display header | Modular design |
| Overload Capacity | 150% ~ 300% FS | Built-in pulse buffer protection |
| Long-term Stability | ≤ ±0.2% FS / year | Extremely low zero point drift |
Multi-Dimensional Industrial Environment Adaptability
1. Vacuum Dedicated KF16 Connection Solution
In laboratory equipment, semiconductor manufacturing, and vacuum freeze-drying equipment, threaded connections often fail to meet extremely high sealing requirements. WH131-FY provides a standard KF16 vacuum quick-install clamp connection, eliminating the need for threaded adapters. This not only simplifies the installation process but also eliminates the risk of pressure leakage from the source, ensuring the airtightness of the vacuum system.
2. Lossless Transmission of Remote Signals
In large-scale engineering projects, the distance between the transmitter and the control cabinet (PLC/DCS) may reach several kilometers. The optimized 4-20mA current loop output circuit of WH131-FY supports signal transmission without attenuation within 5 kilometers. Combined with Nexisense’s industrial data acquisition modules, it can easily achieve remote distributed monitoring.
3. All-Weather Protection with IP68 Rating
For negative pressure monitoring in outdoor exposure, humid trenches, or underwater environments (such as underwater sealed cabin pressure detection), WH131-FY provides a sealed lead wire encapsulated version with an IP68 protection rating. Its robust 316L stainless steel housing and anti-corrosion process ensure long service life in harsh chemical and pharmaceutical environments.
Scenario-Driven: Application Advantages of WH131-FY in Integration Projects
Negative Pressure Liquid Level Monitoring System
In some sealed containers or storage tanks, due to medium characteristics, operation under negative pressure is required. Traditional static pressure level gauges need to be combined with negative pressure transmitters for differential pressure calculation. The fast response (8ms) of WH131-FY can provide real-time feedback on vacuum degree changes at the top of the container, assisting the system in accurately calculating the actual liquid level and preventing pump idling.
Vacuum Pump Sets and Central Vacuum Systems
When integrators assemble central vacuum stations, they need transmitters that can withstand frequent pressure shocks. The built-in pulse buffer design of WH131-FY increases the instantaneous overload resistance by 3 times, effectively extending the sensor life under high-frequency impacts during pump start-stop moments.
Industrial On-Site Real-Time Digital Display Solution
To facilitate on-site inspection personnel to read data directly, WH131-FY supports the addition of an on-site real-time digital display header. This solution requires no additional power supply and uses the 4-20mA current loop to drive a high-brightness LED display, providing real-time data display and upper/lower limit alarm logic output. It is an ideal choice for engineering companies to reduce costs and increase efficiency.
FAQ: Professional Integration and Selection Q&A
Q1: What is the micro negative pressure measurement limit of WH131-FY?
A1: This model has been optimized for the diaphragm specifically for low-pressure conditions, with the minimum range stably reaching -1 kPa. For monitoring even weaker air pressure fluctuations, please contact the technical team to confirm specific working conditions.
Q2: Can the KF16 clamp connection be compatible with non-standard vacuum interfaces?
A2: KF16 is the standard ISO vacuum flange specification. If the site has non-standard interfaces, Nexisense supports custom standard threads such as M20*1.5 or G1/2, and can also provide flange adapter components to ensure “zero modification” installation on site.
Q3: In 5-kilometer long-distance transmission, how to ensure that the signal is not interfered with by on-site power cables?
A3: First, the 4-20mA output signal itself has extremely strong resistance. Second, WH131-FY has an integrated anti-interference ring module inside. It is recommended to use shielded twisted-pair cables during integration and ground the shield at one end to ensure signal transmission purity.
Q4: Can the product’s protection rating handle high-pressure water jet flushing (such as in food processing sites)?
A4: The direct lead wire version of WH131-FY has an IP68 rating and can withstand high-pressure flushing and long-term immersion. The Hirschmann connector version is more suitable for use with protective covers or in dry indoor environments.
Q5: Does the on-site digital display header support on-site range migration?
A5: Yes, it does. The配套 digital display header can set parameters through panel buttons, including decimal point position, zero point correction, and full-scale setting, greatly facilitating on-site debugging work for engineering companies.
Q6: What are the requirements for the measured medium?
A6: WH131-FY standardly uses 304/316L stainless steel isolation diaphragm, suitable for most non-corrosive gases and liquids compatible with stainless steel. For strong acid and alkali environments, Hastelloy or Teflon coating customization can be provided.
Q7: If instantaneous positive pressure backflow occurs in the vacuum system, will the sensor be damaged?
A7: WH131-FY is actually a pressure sensor that supports composite ranges (such as -100 kPa ~ 100 kPa). Its physical structure has more than 200% overload resistance. Slight positive pressure backflow will not damage the sensing diaphragm.
Q8: How to track the factory test data of each transmitter?
A8: Nexisense adopts laser marking technology. Each sensor housing has a permanent traceable laser code. Through this code, system integrators can request the factory inspection report and calibration curve of the product from our company.
Summary
With its precise silicon piezoresistive technology, multi-stage temperature compensation process, and modular electrical adaptation solutions, the Nexisense WH131-FY negative pressure transmitter has become a high-standard choice in the field of industrial vacuum monitoring. For system integrators pursuing engineering reliability and optimal long-term maintenance costs, WH131-FY provides not only data but also a strong endorsement for the stability of the entire industrial system.
This article is provided by the Nexisense Industrial Sensing Technology Department. For specific engineering solution selection, please consult our application engineers to obtain CAD data and communication protocol descriptions.
