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Calorimeters & Sensors

Measure accurately with RESOL and optional Grundfos Direct Sensors™.

Solar Hot Water sensors at operating temperatures (68 ... 176 °F) must measure as accurately as possible in order to ensure that any measurement error of sensors and controller does not exceed 3.6 or 5.4 °Ra.

How RESOL Sensors Work: The sensors contain a material that changes its electrical resistance in proportion to the temperature change. The controller measures the resistance and calculates the temperature of the sensor element.

For Example: Pt1000 is a platinum (Pt) sensor with a resistance of 1000 Ω at 32 °F.

How to Choose the right Sensor: Three different sensor types are available: immersion (well) sensors, clip-on and bolt-on sensors. For each sensor product, options are available for diameter (Dim, L1, L2), Cable Material (Silicone, PVC, Pur) and Temperature Range.

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  1. Grundfos Direct Sensor™ RPS 0-10 bar

    Grundfos Direct Sensor™ RPS 0-10 bar

    Grundfos™ Direct Sensor RPS 0-10 bar, including brass fitting and connection cable.

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  2. Grundfos Direct Sensor™ VFS 1-12l

    Grundfos Direct Sensor™ VFS 1-12l

    Grundfos™ sensor incl. brass fitting, insert and connection cable.

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  3. Grundfos Direct Sensor™ VFS 2-40l

    Grundfos Direct Sensor™ VFS 2-40l

    Grundfos™ sensor incl. brass fitting, insert and connection cable.

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  4. RESOL Indoor Temperature Sensor

    Indoor Temperature Sensor

    RESOL FRP11 Indoor Temperature Sensor.  Made for installation on planar surfaces. Version Pt1000

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  5. RESOL Outdoor Temperature Sensor

    Outdoor Temperature Sensor

    The FAP13 Outdoor Temperature Sensor is used for measuring the outdoor temperature with a platinum measuring element.

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  6. RESOL Bolt-On Sensors

    RESOL Bolt-On Sensors

    Solar Hot Water Controller Sensors for installation on planar surfaces.  Pt1000 version. Available in the dimension, cable material and temperature range of your choice.

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  7. RESOL CS10 Solar Cell

    RESOL CS10 Solar Cell

    The RESOL CS10 Solar Cell is used for measuring momentary irradiation intensity and allows additional plausibility control for the system status. The connection line can be extended up to 100 m.

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  8. RESOL Clip-On Temperature Sensors

    RESOL Cylindrical Clip-On Sensors

    Solar Hot Water Controller Sensors for surface mounting on tubes, including pipe clamp. Pt1000 version. Available in the dimension, cable material and temperature range of your choice.

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  9. SP10 Overvoltage Protection

    RESOL SP10 Overvoltage Protection

    Overvoltage protection device placed in housing with outstanding design, suitable for mounting outdoors. We generally recommend installing the overvoltage protection in order to avoid overvoltage damage at collector sensors, e.g. caused by local lightning storms.

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  10. RESOL Temperature Sensors

    RESOL Temperature Sensors

    Solar Hot Water Controller Sensors made for installation into Sensor Wells.  Available in the dimension, cable material and temperature range of your choice.

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