Hydronic Manometer HM685 TSI

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The TSI Hydronic Manometer HM685 is a comprehensive diagnostic tool designed for balancing hydronic heating and cooling systems, verifying pump performance, and setting balancing valves. Equipped with advanced computational capabilities, the HM685 enables HVAC professionals to measure and display differential, high-side, and low-side pressures simultaneously without changing hose connections or valve settings.

Hydronic Manometer HM685 TSI

Advanced Instrument for Balancing and Diagnosing Hydronic Systems

The TSI Hydronic Manometer HM685 is a comprehensive diagnostic tool designed for balancing hydronic heating and cooling systems, verifying pump performance, and setting balancing valves. Equipped with advanced computational capabilities, the HM685 enables HVAC professionals to measure and display differential, high-side, and low-side pressures simultaneously without changing hose connections or valve settings.

With its integrated flow and energy calculations, programmable Cv (Kv) factors, and data logging, the HM685 offers powerful functionality in a rugged, field-ready package. A large backlit display and intuitive interface enhance usability even in challenging environments.

Features and Benefits

  • Simultaneous display of differential, high-side, and low-side pressures

  • Accepts two temperature probe inputs for precise thermal measurements

  • Integrated BTU/hr and flow calculations

  • Programmable Cv (Kv) factors for flow computation

  • Stores up to 4,000 data points for review or USB download

  • Calculates brake power, heat flow, impeller sizing, and more

  • Displays volumetric flow when Cv/Kv is entered

  • Automatic unit conversion with multiple selectable pressure units

  • Backlit display ensures visibility in low-light areas

  • Splash-proof housing for durability in field conditions

  • Operates with four AA alkaline or rechargeable NiMH batteries

Applications

  • Balancing hydronic heating and cooling systems

  • Verifying and adjusting pump performance

  • Commissioning and maintenance of HVAC systems

  • Performing flow, energy, and performance diagnostics

  • Sizing impellers and calculating hydraulic power

  • System troubleshooting and optimization

Specifications

  • Model Number: HM685

  • Differential Pressure Range: ±300 psi (±2068 kPa)

  • Gauge Pressure Range: -20 to 300 psi (-138 to 2068 kPa)

  • Display: Large, backlit LCD

  • Measurement Units: in. H₂O, ft. H₂O, psi, in. Hg, mmHg, mH₂O, kPa, bar

  • Battery Type: 4 x AA (alkaline or NiMH)

  • Data Storage: Up to 4,000 data points

  • Weight (with batteries): 2.65 lbs (1.20 kg)

  • Casing: Robust, splash-proof

Kit Includes

  • HM685 Hydronic Manometer

  • Hard carrying case

  • Two 6.7 ft (2 m) x 1/4 in. (6 mm) hoses with shut-off valves

  • Two B&G readout probes

  • Two P/T gauge adapter probes

  • Temperature probe

  • USB interface cable

  • Power cord

The HM685 is the ultimate hydronic diagnostic tool for engineers, technicians, and contractors who require comprehensive system performance insights and fast, accurate balancing in complex HVAC applications.

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