What It IsThe YEJ series is a mechanical pressure gauge designed for low‑pressure and negative‑pressure (vacuum) measurement of neutral, non‑corrosive gases. It uses a sensitive capsule
element – not a common Bourdon tube – so it can measure down to
just a few hundred pascals. The rectangular case fits neatly into control cabinets or tight
panels.
Two Models – Pick What You NeedYEJ‑101 (Indicator only) Pure mechanical indication – no electricity required Easy to read, always works even during a power outage Best for on‑site monitoring of boiler air supply, flue gas ducts,
or ventilation systems
YEJ‑121 (With electric contacts) Adds preset upper and lower limit contacts Can directly trigger alarms, relays, or PLC inputs Great for automatic pressure control or safety interlocking
Key Features (No Jargon)Sensitive to very low pressure – Works perfectly where ordinary gauges show no movement Low air intake – Does not disturb the system being measured Rectangular housing – Space‑saving, stable, and vibration‑resistant YEJ‑121 contact capacity – 3A 220V AC, enough for most alarms and small relays Wide pressure range options – From –250 Pa up to 60,000 Pa (positive, vacuum, or
compound)
Typical ApplicationsBoiler combustion air monitoring Flue gas duct pressure (draft measurement) Cleanroom differential pressure HVAC air filters and duct static pressure Dust collection systems Laboratory test benches for low‑pressure gases
Simple Specs (No Table)Accuracy: 2.5% of full scale Pressure connection: φ8 tube (fits φ6 inner diameter hose) Operating temperature: –20°C to +60°C Humidity: ≤85% RH Weight: YEJ‑101 ~2 kg ; YEJ‑121 ~2.5 kg Power (YEJ‑121 only): AC 220V, <5W
Why Choose YEJ?No external power for YEJ‑101 – truly independent mechanical gauge Easy to mount – rectangular shape fits flat panels Reliable in vibration – less pointer drift than round gauges with the same
mechanism Contact version saves cost – no need for a separate pressure switch
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