Part # FH89 or ZSK-752 Bulb Cover for Temperature Sensor | Finlandia / Harvia

Finlandia / Harvia Part # FH89 or ZSK-752 Bulb Cover for temperature sensor for JM heaters. is a dedicated protective shield that keeps your JM series temperature sensor reading accurately and reliably. Designed specifically for Finlandia and Harvia JM models, this cover encloses the sensing bulb to reduce exposure to direct radiant heat, airflow disturbances, and accidental impact that can cause drift or premature failure. Its heat-resistant construction is engineered for the demanding conditions inside a sauna heater, tolerating continuous high temperatures and humidity without warping or cracking. By maintaining a stable environment around the sensor, the FH89 / ZSK-752 helps your control system regulate heat more precisely, supporting safer, more consistent sauna operation. Simple, model-matched installation makes it an ideal replacement whenever the original guard is missing or damaged.