Gas pressure controller YD‑4

HVACfor pipelinesdigital

Short description
The YD‑4 Explosion‑Proof Digital Pressure Controller by YUNYI integrates pressure sensing, real‑time display, analog transmission and alarm/control outputs in a compact, explosion‑protected housing. Using an intelligent MCU and an imported US pressure sensor, the unit delivers high measurement accuracy and reliable operation in hazardous industrial environments.

Key Explosion‑Proof & Safety Features

• Certified Ex d II C T6 Gb – suitable for Zone 1 and Zone 2 hazardous locations.
• Reinforced cast‑aluminum housing with thickened walls; optional lightning‑protected circuit design.
• Built‑in protections: reverse‑connection, over‑voltage, over‑current and leakage protection.
• Protection rating up to IP65 (depending on configuration) – dust and water‑jet resistant.

Integrated Control & Communication

• Measurement range — −0.1 ~ 0 ~ 260 MPa (selectable)
• Accuracy — 0.2% FS ±1 (optional 0.5% or 0.25% FS)
• Sampling rate — 3 samples/sec
• Power supply — AC85~260V or DC24V
• Power consumption — < 3W
• Display — 0.56‑inch red 4‑digit LED (LCD or digital tube optional)
• Operating environment — 0 ~ +70°C, ≤85% RH
• Contact capacity — AC220V 3A

Signal Output Options

• Analog output: 4‑20mA, 0‑5V, 0‑10V (selectable).
• Digital communication: RS485 (Modbus) – supports simultaneous 4‑20mA and RS485 output.
• HART protocol: optional.
• Control outputs: standard 2‑channel alarm relay or custom multi‑point control.

Key Advantages

• All‑in‑one functionality – measurement, display, analog transmission and relay control in one device.
• Field‑adjustable parameters – measurement range, alarm setpoints and other settings configurable on site without factory recalibration.
• High reliability – full digital circuitry with manual zero reset for stable, low‑drift performance; designed to resist shock, vibration and corrosive atmospheres.
• Low power consumption – ultra‑low‑power intelligent control.

Applications

• Petrochemical and natural gas processing (refineries, pipelines, storage).
• Municipal engineering (water treatment, gas distribution).
• Building automation (HVAC, boiler control).
• Industrial machinery and hydraulic systems.
• Power generation and metallurgical plants.

Simple On‑Site Commissioning

• Direct connection to pipeline pressure port; front‑panel parameter setting (no PC required).
• Configure upper/lower alarm limits from the front panel.
• Select engineering units on‑the‑fly (kPa, MPa, bar, psi, etc.).
• Adjust control setpoints and hysteresis to prevent contact chatter.
• One‑key zero reset for initial calibration.

Customization Options

• Display type: LCD or digital tube (customer selectable).
• Housing: 100 mm stainless steel gauge case or explosion‑proof digital dial case.
• Thread connection: M20×1.5 (standard) or custom thread types.
• Sensor material: 304 stainless steel (standard) or other materials per specification.
• Accuracy grade options: 0.5% or 0.25% FS.

Technical specifications

• Model: YD‑4
• Measurement range: −0.1 ~ 0 ~ 260 MPa (selectable)
• Accuracy: 0.2% FS ±1 (options: 0.5% or 0.25% FS)
• Sampling rate: 3 samples/sec
• Power supply: AC85~260V or DC24V
• Power consumption: < 3W
• Display: 0.56‑inch red 4‑digit LED (LCD or digital tube optional)
• Operating temperature: 0 ~ +70°C, ≤85% RH
• Contact capacity: AC220V 3A
• Protection rating: IP65 (depending on configuration)
• Explosion‑proof rating: Ex d II C T6 Gb
• Analog outputs: 4‑20mA, 0‑5V, 0‑10V (selectable)
• Digital outputs: RS485 (Modbus); HART optional
• Control outputs: standard 2‑channel alarm, custom multi‑point control available
• Thread connection (standard): M20×1.5
• Sensor material (standard): 304 stainless steel