Two Models for Different Needs
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YEJ‑101: High‑precision indication terminal for on‑site micro‑pressure monitoring. Ideal for boiler air supply and flue gas duct pressure measurement where no electrical output is required.
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YEJ‑121: Electric contact version that adds binary control outputs. Pre‑set upper and lower limits allow it to directly drive relays, alarms, or PLC inputs for automated control or limit‑based alarming.
Key Features
Exceptional low‑pressure sensitivity – The capsule element expands proportionally to incoming pressure, driving a gear transmission mechanism that moves the pointer smoothly across the scale. This provides accurate, repeatable readings even at very low ranges.
Rectangular housing design – Easier to mount in narrow spaces or panel cutouts compared to circular gauges. The rectangular shape also offers internal space for electric contact mechanisms when equipped.
Low air intake/exhaust – During measurement, the gauge itself consumes very little air, so it does not disturb the pressure of the system being measured.
Contact output (YEJ‑121) – Preset pressure upper/lower limits trigger relay or PLC inputs, enabling automated safety interlocking or alarm functions without an external controller.
Simple mechanical reliability – No external power needed for the YEJ‑101 indicator. Even during power fluctuations, field personnel can obtain reliable first‑hand pressure data directly from the gauge.
Basic Specifications (At a Glance)
Electrical data (YEJ‑121 only)
Measurement Ranges
The YEJ series covers a wide selection of ranges in Pascal (Pa) units, suitable for both positive pressure, vacuum (negative pressure), and compound (positive + negative) measurement. Typical ranges include:
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Positive pressure: 0 ~ 250 Pa up to 0 ~ 60,000 Pa
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Vacuum: –250 ~ 0 Pa up to –60,000 ~ 0 Pa
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Compound (pressure/vacuum): –120 ~ +120 Pa up to –30,000 ~ +30,000 Pa
Applications
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Boiler ventilation systems and combustion air monitoring
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Flue gas duct pressure measurement
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Dust collection systems
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Cleanroom pressure differential monitoring
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HVAC air pressure control
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Laboratory and environmental test stands
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Non‑corrosive, neutral gas pressure indication
The YEJ series is widely used in petroleum, chemical, metallurgy, and industrial machinery sectors wherever non‑explosive fluid media pressures need to be observed or controlled.
Installation & Model Selection
Both YEJ‑101 and YEJ‑121 are designed for direct pipeline connection using the supplied φ8 pressure port (compatible with φ6 inner diameter hoses).
Choose the YEJ‑101 when you only need reliable on‑site pressure indication without electrical output.
Choose the YEJ‑121 when you need automated control or alarming based on pressure setpoints. Pre‑set the upper and lower pressure limits, and the internal contacts will switch at the desired thresholds – directly operating relays, buzzers, or feeding signals to a PLC.
YEJ Series – Low‑pressure measurement, made simple and reliable.
