HB Products launch a new oil level switch for heat pumps and similar applications called HBSO-HP. The switch is suited for applications where the oil temperature is between 40°C and 90°C (104°F and 194°F). The switch is physically similar to HBSO but it has a different switch point which comply to increased oil temperatures and the increased pressure.
For temperatures below 40°C you should still use the HBSO or HBSO-LT and for high temperatures above 90°C the HBSO-SSR-1/ HT must be used.