TSI HM685 Hydronic Manometer


The TSI HM685 Hydronic Manometer 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.

SKU: TSIHM685 Tags: , ,



  • 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 H 2 O, ft. H 2 O, psi, in. Hg, mm Hg, m H 2 O, kPa or bar
  • Differential pressure range ±300 psi (±2068 kPa)
  • Gauge pressure range -20 to 300 psi (-138 to 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
  • Meter weight with batteries is 2.65 lbs (1.20 kg)



TSI Hydronic Manometers – Introduction

Setup & Operation

TSI Hydronic Manometers – Zeroing Sensors and Purging Air

TSI Hydronic Manometers – Taking Measurements


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