The HM670 and HM680 Hydronic Manometers are used to balance hydronic heating and cooling systems and to check pump performance. Both models can measure and display differential, high side, and low side pressures simultaneously without having to change hose connections or instrument valve settings. Both models feature a backlit display and operate on four alkaline or NiMH rechargeable batteries.

The HM680 can also display volumetric flow when a Cv (Kv) factor is programmed. Up to 100 Cv (Kv) factors can be entered. In addition, the HM680 can calculate brake power, heat flow, Cv (Kv) factors and impeller sizing. Up to 1,000 data points can be stored to memory for later recall or downloaded to a PC using CompuDatTM USB software and USB interface cable.

HM680 only:

• Calculates flow using valve manufacturers’ Cv (Kv) factors
• Calculates heat flow, impeller diameter, and brake power