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The Pepperl+Fuchs Z722 is a compact, single-channel Zener barrier designed for intrinsically safe (IS) applications, providing protection for digital (ON/OFF) signals in hazardous areas (Zone 1/21, Zone 2/22). It ensures safe signal transmission between field devices (e.g., switches, solenoids) and control systems by limiting energy to non-incendive levels.
✔ Digital Signal Protection – Designed for switch/solenoid/relay circuits (24V DC typical).
✔ Intrinsic Safety Certifications:
ATEX / IECEx (Ex ia IIC / Ex ib IIC)
FM / CSA (Class I, II, III, Div. 1)
✔ Voltage/Current Limiting:
Max. Voltage (Ui): 250V AC/DC (safe area side).
Output (Uo/Io): Typically 28V DC / 93 mA (hazardous area side).
✔ LED Status Indicator – Visual fault/power monitoring.
✔ DIN-Rail Mountable – Compact design for control panels.
Typical Applications
Emergency stop circuits in hazardous areas.
Solenoid valve control in oil/gas plants.
Limit switch interfacing in chemical processing.
Digital sensor signals in explosive atmospheres.
Wiring & Installation
Safe Area (Control Side)
Terminal 1 (+Ub): Power supply (24V DC typical).
Terminal 2 (GND): Critical earth ground (<1 Ω required).
Terminal 3 (OUT): Signal to/from PLC/relay.
Hazardous Area (Field Side)
Terminal 4 (IS+): Intrinsically safe output to field device.
Terminal 5 (IS–): Return line.
⚠ Safety Note:
Proper grounding is mandatory – Zener barriers rely on earth to shunt excess energy.
Use in Zone 0 requires Ex ia certification (verify model variant).
Comparison with Similar Barriers
Model Signal Type Key Difference
Z722 Digital (ON/OFF) For switches/solenoids
Z786 Analog (4–20 mA) Process signals
KFD2-SR2-Ex2 Galvanic Isolation No ground dependency
Why Choose the Z722?
✅ Cost-effective IS protection for digital circuits.
✅ Globally certified (ATEX, IECEx, FM, CSA).
✅ Simple DIN-rail integration.
Troubleshooting
No Signal Transmission?
Check ground connection integrity.
Verify field device load (≤93 mA).
LED Fault Indication?
Inspect for short circuits or overvoltage.
