TSI HM675/HM685 Hydronic Manometers

Descriptions of TSI HM675/HM685 Hydronic Manometers

The HM675 and HM685 Hydronic Manometers can measure and display differential, high side and low side pressure simultaneously, without having to change hose connections or instrument valve settings. Each model features a backlit display and operates on four alkaline or NiMH rechargeable batteries.
Applications
▪ Test and balance heating and cooling systems
▪ Check pump performance
▪ Set balancing valves

HM675 kit includes hard carrying case, (2) 6.7 ft x ¼-in. (2 m x 6 mm) hoses with shut-off valves, (2) B&G readout probes, (2) P/T gauge adapter probes, and power cord.

HM685 kit includes all items in HM675 kit, plus a temperature probe, CompuDat USB downloading software, and USB interface cable.

Features and Benefits
▪ Measure and display high side, low side, and differential pressure simultaneously
▪ Robust, splash-proof case
▪ Inputs for two temperature probes

Features and Benefits (HM685 only)
▪ Calculates flow using valve manufacturers’ Cv (Kv) factors [up to 100 Cv (Kv) can be entered]
▪ 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
▪ Intuitive menu structure for easy navigation and instrument set up

Technical specifications of TSI HM675/HM685 Hydronic Manometers

Pressure

• Differential Range -300 to 300 psi (-2,068 to 2,068 kPa)
• Gauge Range -20 to 300 psi (-138 to 2,068 kPa) (-40 to 610 in. Hg)
• Resolution (best) 0.001 psi (0.01 kPa)  (0.01 in. Hg)
• Accuracy1 ±1% of reading plus .072 psi (0.5 kPa) (0.15 in. Hg)
• Units psi, in. H2O, ft H2O, kPa, mm Hg, in. Hg, m H2O, bar
• Pressure Connection ¼” 37° flare fitting, Male

Temperature

• Operating (electronics) 40 to 113°F (5 to 45°C)
• Storage -4 to 140°F (-20 to 60°C)
• Liquid Media 32 to 180°F (0 to 82°C)
• Probe (immersion) -40 to 250°F (-40 to 121 °C)
• Resolution 0.1°F (0.1°C)
• Accuracy ±0.5% of reading +1.2°F (0.7 °C)
• Units °F, °C

Flow (HM685 Only)

• Range2 -22,712 to 22,271 m3/h, -99,999 to 99,999 USGPM, (-6,309 to 6,309 l/s)
• Resolution (best) 0.0001 USGPM (0.00001 l/s)
• Accuracy per pressure accuracy + valve deviation
• Units USGPM, UKGPM, m3/h, l/s, l/m

Time Constant User selectable (1, 5, 10, 20, and 30 seconds)

Statistics (HM685 only) min, max, average, sum up to 4,000 readings
Data Storage (HM685 only) 4,000 combined readings, 100 Test IDs
Logging Interval (HM685 only) User selectable (1 to 3,600 seconds)
External Meter Dimensions 11.1 in. × 4.7 in. × 3.5 in. (28.2 cm × 11.9 cm × 8.8 cm)
Meter Weight with Batteries 2.65 lbs (1.20 kg)
Power Requirements Four AA-size cells, or AC adapter