TSI HM675 & HM685 Hydronic Manometers TSI HM675 & HM685 Hydronic Manometers TSI HM675 & HM685 Hydronic Manometers

TSI HM675 & HM685 Hydronic Manometers

TSI HM675 & HM685 Hydronic Manometers are used to balance hydronic heating and, check pump performance to set balancing valves and cooling systems.

Key Features

  • Measure and display differential pressure simultaneously high side and low side from 0 to 300 psi (0 to 2,068 kPa)
  • Robust, splash-proof case
  • Inputs for two temperature probes
Get a Quote
TSI Instruments

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product. We offer distribution of TSI products to the UK and Ireland.

Displaying differential, high side and low side pressure and can measure simultaneously, instrument valve settings or having to change hose connections.

Each model displays a backlit screen and operates on NiMH rechargeable batteries or four alkaline batteries.

Features and Benefits (HM685):

  • • Using valve manufacturers' Cv (Kv) factors [up to 100 Cv (Kv) can be entered] calculates flow
  • • Calculates heat flow, impeller diameter and brake power
  • • Stores up to 4,000 data points to memory for later recall/download to a PC using CompuDat™ USB Software and USB interface cable
  • • For easy navigation and instrument set up an intuitive menu structure


  • • Balance and test cooling and heating systems
  • • Check pump performance
  • • Set balancing valves

  • HM675M Hydronic Manometer Metric

  • HM685M Hydronic Manometer Metric

Accessories and Replacement Parts
  • HMFIT HM accessory kit includes 34 additional fittings and (2) ITT Bell and

  • 801290 HM Temperature probe, 4" probe length (10.2 cm)

  • 801291 HM Temperature probe, 6" probe length (15.24 cm)

  • 801293 HM temperature probe extension cable - 6' (1.8 m)

  • 632360004 P/T Gauge adapter probes, package of 2

  • 632360010 Bell and Gosset read-out probes, package of 2

  • 1303754 USB Cable (1 Meter / 3 ft), USB-A to USB Mini-B)

  • 1319409 HM Carrying case

  • 632650510 HM Hose kit with one red and one blue hose

  • 632650515 HM Hose snubber, package of 2

  • 801761 Universal Power Supply

  • 6006804 Battery Cover and Handle - HM675/685 NOTE: Handle set screw and battery cover screw with spring not included. Re-use hardware from parts that are to be replaced.