Kromschroder Tightness control TC2R05W/W 84765631

The Kromschroder TC2R05W/W (SKU 84765631) is a tightness control device for two shut-off valves, used before burner start or after shutdown. It features an adjustable testing time from 5 to 30 seconds (factory set to 30 seconds) to accommodate various volumes, leaks, and inlet pressures. The device is suitable for solenoid valves with quick or slow operation, including starting load. It operates with natural gas, town gas, LPG (gaseous), biogas (max. 0.1%-by-vol. H2S), and air, which must be clean and dry without condensate. The unit has an IP65 enclosure, impact-resistant plastic housing, aluminium connectors, and a weight of 1.49 kg. It is certified to SIL 3 according to EN 61508 and complies with relevant EU directives and standards.

When selecting a tightness control of this type, ensure the voltage, frequency, and power ratings match the burner control system. Verify the valve opening time and measurement time range are compatible with the application. Check the cable cross-section (0.75–2.5 mm²) and the number of cable glands (5 x M16 x 1.5) for wiring requirements. Confirm the ambient temperature range and installation altitude (up to 2000 m AMSL) are suitable for the installation site. The device must be mounted in a location where no condensation occurs.

Typical failures of tightness controls include internal relay or electronic component faults, leading to failure to complete the tightness test or false leak detection. Symptoms may include the burner not starting, repeated lockouts, or error codes indicating a leak when none exists. Check the wiring connections, fuses (F1 and F2), and the integrity of the valve outputs and fault signal terminals. Also, verify that the gas supply pressure and valve operation are within specifications, as external issues can mimic device failure.