Hydronic Manometer HM685 by TSI Alnor - Pressure & Flow Measurement

HM685

As low as $175.00

TSI Alnor HM685 hydronic manometers are used to balance steam and hot water heating systems, chilled water cooling systems, and to check pump performance. Balancing these hydronic systems reduces energy consumption and saves money. The HM685 can measure and display differential pressure, high side gauge pressure, and low side gauge pressures simultaneously without the need to change hose connections or instrument valve settings. Enter a valve manufacturer's Cv flow factor into the HM685, and it will display a volumetric flow up to 100 Cv.

The TSI Alnor HM685 Hydronic Manometer is an easy-to-use instrument designed for balancing and troubleshooting hydronic systems. Ideal for steam and hot water heating, chilled water cooling, and pump performance checks, the HM685 helps reduce energy consumption and improve system efficiency.

Unlike basic gauges, the HM685 simultaneously measures and displays differential pressure, high-side pressure, and calculated low-side pressur. No need to swap hose connections or change valve settings. By entering a valve manufacturer’s Cv (or Kv) factor, the HM685 instantly calculates volumetric flow rates up to 99,999 GPM, making it a powerful tool for hydronic balancing and diagnostics.

Built-in data logging, temperature measurement ports, USB connectivity, and advanced calculation modes (including pump laws and heat flow) make the HM685 a professional-grade instrument for engineers and technicians.

Rental Includes: 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

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

More Information

More Information
SKU	HM685
Manufacturer	TSI Alnor
Kit Contents	Instrument with 6" temperature probe, red and blue hose assemblies with shut-off valves, two pressure/temperature gauge adapter probes, two ITT Bell and Gossett readout probes, AC power supply, USB cable and software, battery kit calibration certificate, and user manual.
Measuring Range Pressure	0 - 300 PSI, 0 - 2068 kPA
Shipping Dimensions (LxWxD)	20x15x12
Weight (lbs)	26.000000
Power	Alkaline Replaceable Batteries, NiMH Rechargeable Batteries