Alnor Hydronic Manometer HM685

Minimum Purchase:
1 unit
  • HM685 Hydronic Manometer
  • Alnor Hydronic Manometer HM685
MSRP: $4,400.00
Price: $3,960.00
— You save $440.00


Alnor Hydronic Manometer HM685

Hydronic Manometer HM685 is used to balance hydronic heating and cooling systems, check pump performance and set balancing valves. It can measure and display differential, high side and low side pressures simultaneously, without the need to change hose connections or instrument valve settings. The easy setup and intuitive operation make this instrument very simple to use.


  • Provides for inputs for two temperature probes
  • Large backlit display for use in low light areas
  • Operates on four alkaline or NiMH rechargeable batteries
  • Reads in H2, ft. H2, psi, in. Hg, mm Hg, m H2, kPa or bar
  • Measures from 0–300 psi (0–2068 kPa)
  • Performs on-board universal flow and btu/hr calculations
  • Displays volumetric flow when a Cv (Kv) factor is programmed
  • Allows up to 100 Cv (Kv) factors to be entered
  • Calculates brake power, heat flow, Cv (Kv) factors, and impeller sizing
  • Stores up to 4,000 data points for recall or downloading via USB interface
  • Robust, splash-proof case
  • Ceter weight with batteries is 2.65 lbs (1.20 kg)



  • Hard carrying case
  • (2) 6.7 ft x ¼-in. (2 m x 6 mm) hoses with shut-off valves
  • (2) B&G readout probes
  • (2) P/T gauge adapter probes
  • Power cors
  • Temperature cord
  • CompuDat USB downloading software
  • USB interface cable



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