EXTECH HD755 User Guide

User Guide

Heavy Duty

Differential Pressure Manometer

Model HD755

Introduction

Congratulations on your purchase of the Extech Manometer Model HD755. This device
measures gauge and differential pressure in the range of ±0.500 psi. The HD755 offers
eleven (11) units of measure (user selectable by front panel pushbutton) and has a
differential input that uses convenient quick-disconnect fittings. Advanced features include
DATA HOLD, MIN-MAX-AVG RECORD mode, ZERO/OFFSET, AUTO POWER OFF, and
USB PC interface. This instrument is shipped fully tested and calibrated and, with proper
use, will provide years of reliable service.

Meter Description

1. P1 input

2. AC adaptor jack

3. P2 Input

4. LCD Display – Indicates the measurement data, unit of
measure, elapsed timer, and function symbols as
described in this manual

5. USB PC interface jack (3.5mm) – For use with data
acquisition software

6. UNIT button – Press to select the unit of measure

7. DIF button– Press to display differential pressure. Also
used to OFFSET the displayed readings.

8. RECORD button– Press to access the MIN/MAX/AVG
recording mode

9. HOLD / ZERO button– Press to freeze the displayed
reading. Also used to zero the display (press and hold
until display shows all zeroes).

10. BACKLIGHT
automatically turn OFF after 40 seconds.

11. POWER button – Press to turn the meter ON or OFF

12. Battery compartment (on rear)

Display

1. USB data output active

2. Differential Pressure Mode

3. Data Hold Mode

4. Primary display

5. Record Mode

6. MAX/MIN/AVG indicators

7. Low Battery Indicator

8. Pressure unit of measure

9. Elapsed Timer

button – Press to switch the display backlight ON. The backlight will

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HD755-EU-EN V1.4 8/10