This is the wall mounting version of the Contrec 212 BTU Heat Calculator, set up without an analogue or relay output, running on DC power, and without a temperature probe pair included. We get this configuration a lot from chiller plant and district cooling contractors who already have their own matched Pt100 or Pt1000 sensor pairs installed in the flow and return lines, and just need the calculator itself to do the energy computation and display.
Wall mounting with standard cable gland entries means this unit is meant to sit on a wall or support bracket near the pipework, not flush into a panel door. Customers usually choose this over the panel mount version when there is no control panel nearby, or when the meter needs to be close to the flowmeter and sensor cabling to keep wiring runs short. Going DC powered instead of loop powered or battery powered also means there is no 4-20mA output riding on the power loop, so if you need a signal back to a BMS or SCADA system, this is not the variant to order. No output option here is deliberate for straightforward local billing use, where the display reading itself is what matters, not a remote signal.
The OIML R75 compliance is important if this reading is used for cost allocation between tenants or departments, since it means the unit meets the metrology standard usually expected for that kind of billing. Before we quote this exact configuration, we would normally check with the customer whether they already have their sensor pair, what cable entry size they need, and whether they are certain no output signal will be needed later, because retrofitting an output option after installation is not simple. Hope this helps.
