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Risycor CBU-Zerofix-Set

The Risycor CBU corrosion monitor with alarm function designed for heating systems.

Mounting in the pipe with a flow-through Zerofix lockshield valve device, which places the metal coupon at the tip of the probe in the water flow. The oxidation of this coupon is representative of the uniform corrosion within the system. The logger records the corrosion rate against time and warns of inadmissible values or a defect. The memory can be read out with a computer.

Zerofix lockshield valve device for bayonet mounting of the corrosion monitor Risycor CBU with connection for expansion vessel and drain valve. Mounting in the return; the lockshield valve function with drain valve allows draining of the expansion vessel in order to check the inflation pressure and to correct if required.


  • Risycor CBU Logger–probe combination.
  • Zerofix 25/25/20 Lockshield valve device (with tie wrap and drain valve).
  • Mains adaptor.
  • Risycor CBU- Zerofix set.

General information
Specification data - Corrosion monitors

Product Reference

Risycor CBU-Zerofix-Set

Standard product features

Outputs (signals, alarm):

  • Visual: Various LEDs for display of operating and alarm status.
  • USB: Memory readout.
  • Volt-free contact for: Building management system, remote surveillance, other signal transmitter (SMS module, audible alarm, flashing light etc.), shutting down of the boiler.
  • Alarm in case of: Corrosion rate too high (adjustable), fault in the corrosion monitor, end of the service life of the metal coupon on the probe.

Technical characteristics:

- Physical:

  • Pressure range: 0–6 bar.
  • Temperature range: 5–85°C, integrated temperature compensation.
  • Environment: 0–45°C, no condensation.
  • Storage: -5 to +60°C.
  • Risycor CBU probe: Polyphenylene sulfide (PPS).
  • Risycor CBU logger: Polycarbonate (PC).
  • Zerofix lockshield valve device: Housing: nickel plated CW617N (EN12165), ball: PPSU, sealings: Polytetrafluoroethylene (PTFE) G400.
  • Coupon: Fe.
  • Connections Zerofix 25/25/20: 2xG1”, G3/4” con­nection for expansion vessel, G3/8” drain valve with hose tail 12.5 mm.

- Electrical:

  • Mains adaptor: CEE 7/16, 230 V a.c., 50 Hz.
  • 5 V d.c. mini-USB.
  • Power consumption: 2.5 W.
  • Volt-free contact - nominal 48 V d.c., 100 mA or 48 V a.c. RMS 80 mA - max. 350 mA at <10 ms.
  • IP52.

- Other:

  • Capacity of the memory: Ten+ years.
  • Data storage: Every seven hours.

- Dimensions:

  • Logger and probe: 72 x 52 x 53 mm.
  • Zerofix lockshield valve device: DN25 x DN25 x DN20.
  • Total weight: 1145 g.

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