Extech Instruments HD750 User manual

User Guide

Heavy Duty

Differential Pressure Manometer

Model HD750

HD750 V1.2 3/08

Warranty

EXTECH INSTRUMENTS CORPORATION (A FLIR COMPANY) warrants this instrument

to be free of defects in parts and workmanship for three years from date of shipment (a six

month limited warranty applies to sensors and cables). If it should become necessary to

return the instrument for service during or beyond the warranty period, contact the

Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our

website www.extech.com for contact information. A Return Authorization (RA) number

must be issued before any product is returned to Extech. The sender is responsible for

shipping charges, freight, insurance and proper packaging to prevent damage in transit.

This warranty does not apply to defects resulting from action of the user such as misuse,

improper wiring, operation outside of specification, improper maintenance or repair, or

unauthorized modification. Extech specifically disclaims any implied warranties or

merchantability or fitness for a specific purpose and will not be liable for any direct, indirect,

incidental or consequential damages. Extech's total liability is limited to repair or

replacement of the product. The warranty set forth above is inclusive and no other

warranty, whether written or oral, is expressed or implied.

Introduction

Congratulations on your purchase of the Extech Manometer Model HD750.

This device measures gauge and differential pressure in the range of ±5.000 psi. The

HD750 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.

HD750 V1.2 3/08

Meter Description

1. P2 input

2. AC adaptor jack

3. P1 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 button – Press to switch the display

backlight ON. The backlight will 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

HD750 V1.2 3/08

Basic Operation

Meter Power

The HD750 uses a 9V battery for power. If the meter does not switch on when the POWER

button is pressed or if the display shows BAT,replace the battery.

When the POWER buttons is pressed, the meter performs a short self-test and reverts to

the settings in place when the meter was last turned off.

Automatic Power-off Feature

In order to conserve battery life, the meter has an automatic power off feature (after 20

minutes). To defeat this feature, press and hold the HOLD button while turning the meter

on. Release the HOLD button when ‘n’ appears on the display. The meter will now remain

on until the user turns it off or until the battery weakens. Note that the Auto Power OFF

feature will be reactivated the next time the meter is turned off and then on.

Unit of Measure

Press the UNIT button to select the unit of measure. This meter offers eleven (11) units of

measure as listed below.

Unit of Measure Display icon

Pounds per square inch psi

Inches of Mercury inHg

Milli-bar mbar

Millimeters of Mercury mmHg

Kilo-Pascals kPa

Kilograms per centimeter squared Kgcm2

Inches of water inH2O

Feet of water ftH2O

Centimeters of water cmH2O

Bars Bar

Ounces per square inch ozin2

Fittings Connection

Connect tubing to the P1, P2 (or both) input port(s). If both inputs are used (differential

mode), the meter displays a positive pressure reading if the P1 pressure is greater than P2

and a negative reading if P2 is greater than P1.

Zero Adjust and Offset function

To ZERO the meter: Before use and without fittings attached to the meter, press and hold

the HOLD button for 3 seconds or until the display shows all zeroes.

To OFFSET meter readings: Press the DIF button while taking a measurement.

Subsequent readings will represent the difference between the current measurement and

the measurement that was on the display when the DIF button was pressed.

HD750 V1.2 3/08

MIN-MAX-AVG Record Mode with Elapsed Timer

The RECORD function tracks the maximum (MAX), minimum (MIN), and average (AVG)

readings with a time stamp. The elapsed timer is displayed on the lower right-hand corner

of the LCD and informs the user of the time a MAX or MIN reading was recorded.

1. Press the RECORD button once. The REC indicator will appear on the display and

the displayed elapsed timer will start (HH:MM:SS format [hours:minutes:seconds]).

2. Press the RECORD button again to view the highest (MAX) reading recorded since

the RECORD button was first pressed. The MAX indicator and maximum reading will

appear on the display. The elapsed timer will show the time of the MAX event.

3. Press the RECORD button again, the MIN indicator and the minimum value will

appear on the display. The elapsed timer will show the time of the MIN event.

4. Press the RECORD button again, the AVG indicator and the average value will

appear on the display. The elapsed timer will continue to run.

5. To return to normal operation, press and hold the RECORD button until the display

indicators REC, MAX, etc. switch off.

Note that in the RECORD mode, the backlight and the power buttons are the only

available functions.

USB PC Interface

The meter has a built-in USB port for use with the Manometer Data Acquisition software.

The software allows the user to view, save, export, and print readings from the HD750.

Refer to the documentation included with the software for complete details.

Displayed Error Codes

The following codes are displayed when the meter encounters an error.

ERR 1: Pressure input exceeds specified limits

ERR 2: Pressure input is too low to read

ERR 3: The Differential Pressure input exceeds specified limits

ERR 4: The Differential Pressure input is too low to read

HD750 V1.2 3/08

Specifications

General Specifications

Display Four digit LCD with function indicators

Units of Measure BAR, mBAR, psi, kg/cm2, mm Hg, inches Hg, kPa, feet H2O,

inches H2O, cm H2O, and oz in2

Accuracy ±0.3%FS (@ 25°C)

Repeatability ±0.2% to 0.5% FS

Linearity/Hysteresis ±0.3%FS

Combined Accuracy ±1.1%FS

Maximum Pressure 10psi

Response time 0.5s typical

Input circuit Differential inputs (P1 and P2)

Input Ports Two metal 4.8mm, barbed for 1/8" (3.17mm) ID tubing

Data Hold Freezes displayed reading

Sensor Built-in piezoelectric sensors

Zero / Offset function Pushbutton activation

Sample rate 0.5 sec. (approx.)

Compatibility Air or non-corrosive and non-ionized gas (not intended for

use with liquids)

Auto Power OFF Meter turns off after approx. 20 minutes to conserve energy

(can be deactivated)

PC Interface Built-in USB serial interface

Storage conditions 14 to 140oF (0 to 60oC); < 80% RH

Operating conditions 32 to 122oF (0 to 50oC); < 80% RH

Battery power 9V alkaline battery (BAT low battery indicator)

Battery life 125 hours typical

Dimensions 8.2 x 2.9 x 1.9” (210 x 75 x 50mm)

Weight 9.8oz (280g)

Range Specifications

Range/Units (Max.) Resolution

± 0.344bar 0.001

± 344.7mbar 0.1

± 5.000psi 0.001

± 0.351Kg/cm20.001

± 258.5 mm Hg 0.1

± 10.18 inches Hg 0.01

± 34.47kPa 0.01

± 11.53feet H2O 0.01

± 138.3inches H2O 0.1

± 351.5cm H2O 0.1

± 80.00oz in20.01

Warning: Pressure inputs of 10 psi or higher will damage the instrument. Do not

apply pressure higher than the maximum pressure listed in the specification table

HD750 V1.2 3/08



Support line (781) 890-7440

Technical Support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451

Battery Replacement

When the low battery indicator BAT appears on the display or if the meter does not switch

on when the POWER button is pressed, it is necessary to replace the battery.

To replace the battery:

1. Open the battery compartment by sliding the meter’s rear panel in the direction of the

embossed arrow.

2. Replace the 9V alkaline battery

3. Replace the battery compartment cover.

Conversions

Useful conversion Factors

From To Multiplier

in of H2O in of Hg 0.07355

in of H2O cm of Hg 2.54

mm of Hg in of H2O 0.03937

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Care Department for

information on calibration services available for this product. Extech recommends that

annual calibrations be performed to verify meter performance and accuracy.

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