Key Explosion‑Proof & Safety Features
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Certified Ex d II C T6 Gb explosion‑proof rating – suitable for Zone 1, Zone 2, and other hazardous locations where explosive gas atmospheres may be present
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Reinforced cast‑aluminum housing with thickened walls and optional lightning‑proof circuit design for enhanced safety
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Built‑in protections against reverse connection, over‑voltage, over‑current, and leakage
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IP65 protection level (depending on configuration) – resistant to dust and water jets, ensuring reliable operation even in harsh industrial conditions
Integrated Control & Communication
Signal Output Options
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Analog output: 4‑20mA, 0‑5V, 0‑10V (selectable)
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Digital communication: RS485 (Modbus) – supports simultaneous 4‑20mA and RS485 output
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HART protocol (optional)
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Control outputs: 2‑channel alarm control (standard) or custom multi‑point control
Key Advantages
All‑in‑one functionality – Pressure measurement, digital display, analog transmission, and relay control in a single device, eliminating the need for separate gauges, transmitters, and switches.
Field‑adjustable parameters – Measurement range, alarm setpoints, and other parameters can be modified directly on‑site without factory recalibration, significantly reducing commissioning and maintenance time.
High reliability – All‑digital circuitry with manual zero‑clearance function ensures stable, drift‑free operation. The device withstands shock, vibration, and corrosive conditions where traditional analog gauges often fail.
Low power consumption – Ultra‑low‑power intelligent control reduces energy usage and heat generation, extending component life.
Applications
This explosion‑proof digital pressure controller is widely used in environments where flammable or explosive gases or dusts may be present:
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Petrochemical and natural gas processing (refineries, pipelines, storage facilities)
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Municipal engineering (water treatment, gas distribution)
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Building automation (HVAC, boiler control)
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Industrial machinery and hydraulic systems
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Power generation and metallurgical plants
It has been certified by national metrology and explosion‑proof authorities and is trusted in water treatment, chemical processing, electric power, and metallurgy sectors.
Simple On‑Site Commissioning
Installation is straightforward – the controller can be connected directly to the pipeline pressure port. Once installed, operators can:
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Set upper/lower alarm limits via front‑panel buttons (no PC required)
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Select engineering units on‑the‑fly (KPa, MPa, bar, Psi, etc.)
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Adjust control setpoints and hysteresis values to eliminate contact chatter
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Perform one‑key zero reset for initial calibration
Why Choose the YD‑4 Explosion‑Proof Controller?
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Certified safety – Ex d II C T6 Gb rating meets stringent hazardous‑area requirements
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Cost‑effective – Combines multiple instruments into one, reducing procurement and installation costs
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Future‑ready – RS485 digital communication enables remote monitoring and integration with SCADA systems
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Built to last – Rugged construction for long service life in demanding industrial environments
Customization Options
The YD‑4 can be tailored to specific requirements:
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Display type: LCD or digital tube (customer‑selectable)
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Housing: 100mm stainless steel pressure gauge case or explosion‑proof digital dial case
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Thread connection: M20×1.5 (standard) or custom thread types
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Sensor material: 304 stainless steel (standard) or other materials per customer specification
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Accuracy grade: 0.5% or 0.25% FS
