TSI HM675, HM685 SPECIFICATIONS

HYDRONIC MANOMETERS

MODELS HM675, HM685

The HM675 and HM685 Hydronic Manometers are used to balance

hydronic heating and cooling systems, check pump performance and to set

balancing valves. They can measure and display dierential, 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.

Features and Benets

+ Measure and display high side, low side, and dierential

pressure simultaneously from 0 to 300 psi (0 to 2,068 kPa)

+ Robust, splash-proof case

+ Inputs for two temperature probes

Features and Benets (HM685 only)

+ Calculates ow using valve manufacturers’ Cv (Kv) factors

[up to 100 Cv (Kv) can be entered]

+ Calculates heat ow, 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

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-o 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.

UNDERSTANDING, ACCELERATED

SPECIFICATIONS

HYDRONIC MANOMETERS
MODELS HM675 AND HM685

Pressure

Dierential Range 0 to 300 psi (0 to 2,068 kPa)
Gauge Range 0 to 300 psi (0 to 2,068 kPa)
Resolution (best) 0.001 psi (0.01 kPa)
Accuracy1 ±1% of reading or .072 psi (0.5 kPa),
whichever is greater
Units
m H2O, bar

psi, in. H2O, ft H2O, kPa, mm Hg, in. Hg,

Pressure Connection ¼” 37• are tting, 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 -40 to 250°F (-40 to 121 °C)
Resolution 0.1°F (0.1°C)
Accuracy ±0.5°F (0.3°C) from 32 to 160°F
(0 to 71°C); max ± 2.0°F (1.2°C) from

-40 to 32°F (-40 to 0°C) and from
160 to 250°F (71 to 121°C)
Units °F, °C

Flow (HM685)

Range2 0 to 2,271 m3/h, 0 to 9,999 USGPM
(0 to 6,31 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

Product feature comparison HM675 HM685

Dierential, high side, and low side
pressures displayed simultaneously
Range 0 to 300 psi (0 to 2,068 kPa)
Reads in in. H

O, ft H2O, psi, in. Hg, m

2

H2O, kPa, mm Hg, bar

+ +

+ +

+ +

Performs ow calculations +

Downloading software and USB cable +

Temperature probe optional +

Hard carrying case + +

Certicate of Calibration + +

Unique Calculations menu
for determining:

HM675 HM685

Brake Power +

Heat ow +

Calculate Cv/Kv +

Pump law impeller diameter +

Pump law delta P +

Pump law brake power +

Statistics
min, max, average, sum up to 4,000 readings (HM685 only)

Data Storage

4,000 combined readings, 100 Test IDs (HM685 only)

Logging Interval (HM685 only)
User selectable (1, 5, 10, 20, and 30 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

1

Accuracy statement applies from 0 to 250 psi (0 to 1724 kPa)

2

The ow reading is a calculated value determined from the measured Dierential pres-

sure, user entered valve ow coecient (Kv or Cv), and uid specic gravity

Specications subject to change without notice.

UNDERSTANDING, ACCELERATED

TSI Incorporated

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Printed in U.S.A.

P/N 5001534 Rev A ©2013 TSI Incorporated

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