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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. RESOL Sensor Wells

    Sensor Wells (NPT Thread)

    For diameters and sizing, please refer to the diagram image(s) for measurements.

    Note: In case of domestic water installations only use stainless steel immersion sleeves.

    Learn More
  2. RESOL WMZ G1 Calorimeter

    WMZ-G1 Calorimeter (with Grundfos Direct Sensors)

    The WMZ-G1 is a measurement and display unit for solar thermal systems and conventional heating systems.

    It is possible to connect up to two Grundfos Direct Sensors™, which measure the temperature as well as one additional value – depending on the type: flow rate, relative or differential pressure.

    Learn More

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