In installations using glycol, the actual concentration of the mixture must be periodically checked.
Why it is important
Too low a concentration may not provide sufficient frost protection, while an excessively high one increases viscosity and pressure losses.
Measurement
A suitable instrument, such as a refractometer, is used according to the glycol type.
Maintenance
The condition of the fluid is also checked and, where required, the effectiveness of the corrosion inhibitors.
