Hydronic Manometer HM685 by TSI Alnor - Pressure & Flow Measurement

Area Monitoring Datalogging
Heating, Ventilation & Air Conditioning (HVAC) Manufacturer: TSI Alnor
Hydronic Manometer HM685 by TSI Alnor - Pressure & Flow Measurement
Hydronic Manometer HM685 by TSI Alnor - Pressure & Flow Measurement
Hydronic Manometer HM685 by TSI Alnor - Pressure & Flow Measurement

The TSI Alnor HM685 is a professional-grade hydronic manometer that simultaneously measures and displays differential pressure, high-side gauge pressure, and low-side gauge pressure, all without changing hose connections or valve settings. By entering a valve manufacturer's Cv or Kv flow factor, the HM685 calculates volumetric flow rates up to 99,999 GPM. Additional capabilities include built-in data logging, dual temperature measurement ports, USB connectivity, and advanced calculation modes for pump laws and heat flow analysis. Ideal for balancing and troubleshooting steam and hot water heating, chilled water cooling, and hydronic pump performance systems.

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Hydronic Manometer HM685 by TSI Alnor - Pressure & Flow Measurement
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About This Product

The TSI Alnor HM685 is a professional-grade hydronic manometer that simultaneously measures and displays differential pressure, high-side gauge pressure, and low-side gauge pressure, all without changing hose connections or valve settings. By entering a valve manufacturer's Cv or Kv flow factor, the HM685 calculates volumetric flow rates up to 99,999 GPM. Additional capabilities include built-in data logging, dual temperature measurement ports, USB connectivity, and advanced calculation modes for pump laws and heat flow analysis. Ideal for balancing and troubleshooting steam and hot water heating, chilled water cooling, and hydronic pump performance systems.

Features & Capabilities

Datalogging: ✓ Yes
Monitoring Scope: Area Monitoring

Equipment Specifications

  • Differential Pressure Range:±300 psi (±2068 kPa)
  • Gauge Pressure Range:-20 to 300 psi (-138 to 2068 kPa)
  • Flow Range:up to 99,999 USGPM (calculated)
  • Resolution:0.001 psi, 0.0001 USGPM, 0.1°F (0.1°C)
  • Accuracy:±1% of reading +0.072 psi; Flow: ±0.5% of reading +1.2°F
  • Temperature Probe Range:-40 to 250°F (-40 to 121°C)
  • Units:inches, feet, or meters H2O, psi, inches or mm Hg, kPa or bar
  • Data Logging:100 test IDs, up to 4000 readings with time/date stamp, using TSI CompuDat USB software, included free with each rental
  • Power:4 AA batteries (alkaline or NiMH, rechargeable via AC adapter)
  • Battery Life:~12 hours with backlight, ~18 hours without
  • Calculates brake power, heat flow, Cv factors, and impeller sizing plus universal flow and BTU/hour

Kit Contents

TSI HM685 Hydronic Manometer, blue and red hose kit, shut-off valves (1 red, 1 blue), two blue flow restrictor connectors, HMFIT accessory kit with various adapters, B&G readout probes and P/T gauge adapter probes, temperature probe, AC adapter, mini USB cable, CompuDat software/manual/quick start guide on flash drive, and 4 spare AA batteries

Manufacturer Resources

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