⚡ XML Electromechanical Pressure Switch Series

( These are mechanical pressure and vacuum switches used for control circuits, not transmitters. They are part of the XM range, and the XML family includes:

• XMLA — Fixed differential
• XMLB — Adjustable differential
• XMLC — Adjustable differential, 2 contacts
• XMLD — Dual‑stage switching

All of this is directly confirmed in your document:

“ XML pressure and vacuum switches are designed for use in control circuits… used to control the pressure of hydraulic oils, fresh water, sea water, air, steam, corrosive fluids or viscous products, up to 500 bar. ”

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🧩 1. XMLA — Fixed Differential Pressure Switch

Document‑supported features:

• 1 CO contact
• Fixed differential(PB is not adjustable)
• Used for single‑threshold detection
• Pressure ranges from 350 mbar → 500 bar
• Fluid compatibility: hydraulic oils, fresh water, air, steam, corrosive fluids

Document excerpt:

“ XMLA pressure and vacuum switches have a fixed differential and are used for detection of a single threshold. ”

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🧩 2. XMLB — Adjustable Differential Pressure Switch

Document‑supported features:

• 1 CO contact
• Adjustable differential(PB can be tuned)
• Used for regulation between two thresholds
• Pressure ranges: 350 mbar → 500 bar
• Available with DIN connector or terminal block
• Fluid connection: G1/4 or 1/4" NPTF

Document excerpt:

“ XMLB pressure and vacuum switches have an adjustable differential and are used for regulation between 2 thresholds. ”

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🧩 3. XMLC — Adjustable Differential, 2 Contacts

Document‑supported features:

• 2 CO contacts
• Adjustable differential
• Used when two independent outputs are needed
• Pressure ranges: 350 mbar → 500 bar
• Suitable for hydraulic oils, fresh water, air, and corrosive fluids

Document excerpt:

“ XMLC pressure and vacuum switches… incorporate 2 CO single‑pole contacts. ”

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🧩 4. XMLD — Dual‑Stage Pressure Switch

Document‑supported features:

• Two switching stages(PH1 and PH2)
• Fixed differential
• Used for two‑level alarms, e.g.:
  • Stage 1: warning
  • Stage 2: shutdown
• Pressure ranges: 350 mbar → 160 bar

Document excerpt:

“ XMLD pressure and vacuum switches… dual stage… detection at each threshold. ”

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🔧 General Characteristics

• Conformity: CE, IEC/EN 60947‑5‑1, UL 508, CSA C22‑2
• Contacts: CO (changeover), positive‑opening
• Fluid compatibility:
  • Hydraulic oils
  • Fresh water
  • Sea water
  • Air
  • Steam
  • Corrosive fluids
  • Viscous products
• Pressure ranges:
  • From 350 mbar to 500 bar
• Electrical connections:
  • Terminals
  • DIN EN 175301‑803‑A connector
• Mechanical life:
  • Up to 5 × 10⁶ cycles(varies by model)

Document excerpt:

“ Used to control the pressure of hydraulic oils, fresh water, sea water, air, steam, corrosive fluids or viscous products, up to 500 bar. ”

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🏭 Applications

• Hydraulic systems
• Fresh water & sea water systems
• Steam circuits
• Pneumatic systems
• Industrial process control
• Viscous or corrosive fluid handling
• Pump and compressor control

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⭐ One‑line summary

The XML electromechanical pressure switch series (XMLA/B/C/D) provides robust, adjustable or fixed‑differential mechanical pressure control for hydraulic, pneumatic, water, steam, and corrosive‑fluid applications up to 500 bar.