Ex pzc control unit for Zone 2/22
  • Black box system
  • Automatic purge time calculation
  • WEB interface
  • 3 x PT100/1000 inputs
  • Modular design
  • Separate purge gas input and output


The SILASpz Ex p control unit controls and monitors the purge and operating phase of pressurized enclosure equipment protected in accordance with ignition protection type pzc.

Digital or proportional purge gas valves can be used. The parameters can be set using the integrated WEB interface or the optionally available p operator panel.

The SILASpz features two release relays; one which is energised and one which has floating contacts. Two signal relays with one changeover contact each are additionally available.

Three PT100/1000 inputs are available to monitor the temperature of the Ex pprotected equipment. Up to three switch values can be assigned to them. Model II comes complete with integrated pressure measurement. The following components are additionally required to set up a complete control system:

– Pressure monitor
– Purge gas valve, proportional or digital
– Valve fuse
– Pressure reducer
– There is the option to connect a p operator panel

Technical Data

Protection class IP 66 according to EN/IEC 60529
IP 64 according to EN/IEC 60079-0
Pressure range 0 to 25 mbar for all pressure switching levels
Purge time 0 to 120 minutes (adjustable)
Temperatures Operating temperature
-25 °C to +60 °C @ T4 (-13 °F to 140 °F @ T4)
-25 °C to +50 °C @ T5 (-13 °F to 104 °F @ T5)
Storage temperature
-20 °C to +60 °C (-4 °F to 140 °F)
Voltage AC Variant:
AC 100 V up to 230 V
DC Variant:
DC 24 V up to 44 V
Material V4A stainless steel
Display 6 LEDs for status display
Relay Enable contact, switched input voltage max. load 5A
Enable relay, potentiel free, 4 NO
2x Signal relay for status transmission (potentail free), CO
Weight 6.8 kg

Manuals/Operating Instructions/Guides

Operating Instructions – SILAXpz control unit


Data Sheets

Data Sheet – SILASpz control unit