Kromschroder Air/gas ratio control GIK25R02-5 03155134

Kromschroder GIK25R02-5 is an air/gas ratio control, a pressure ratio regulator designed to maintain a constant 1:1 gas-to-air ratio in burner systems. It has a nominal diameter of 25 mm with Rp 1" internal thread, a maximum inlet pressure of 200 mbar, and a pressure range of 0.005–1.2 mbar. The device features inlet pressure compensation, a compensation diaphragm, and zero shut-off for safety. It is certified to EN 88, CE, and EU standards and is suitable for natural gas, LPG, and air applications.

When selecting a replacement air/gas ratio control of this type, verify the nominal diameter and connection thread to match the existing gas train. Ensure the maximum inlet pressure and pressure range are compatible with the system's operating conditions. The control must be installed between the gas valve and burner, with impulse lines connected to the air side. Check that the gas/air ratio and turndown requirements align with the burner's specifications.

Common failures include diaphragm fatigue, spring drift, or blocked impulse lines, leading to unstable combustion or high emissions. Symptoms may include fluctuating gas pressure, poor flame stability, or increased pollutant output. Inspect the diaphragm for tears or stiffness, check spring tension, and clear any debris from impulse lines.