Extech Instruments HD750 User manual

USER GUIDE

Heavy Duty

Differential Pressure Manometer

Model HD750

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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 meter is shipped fully

tested and calibrated and, with proper use, will provide years of reliable service. Please visit our

website () to check for the latest version of this User Guide, Product Updates, and

Customer Support.

Meter Description

1. P1 input

2. AC adaptor jack

3. P2Input

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

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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

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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.

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Zero Adjust and Offset function

The unit must be kept in the upright position when ZEROING or when taking measurements. 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.

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

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

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

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

Battery life 125 hours typical

Dimensions 210 x 75 x 50mm (8.2 x 2.9 x 

1.9 )

Weight 280g (9.8oz)

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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

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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.

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate

collection sites, the retail store where the batteries were purchased, or wherever

batteries are sold.

Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end

of life devices to a designated collection point for the disposal of electrical and electronic

equipment.

Other Battery Safety Reminders

oNever dispose of batteries in a fire. Batteries may explode or leak.

oNever mix battery types. Always install new batteries of the same type.

Conversions

Useful conversion Factors

From To Multiplier

in of H2O in of Hg 0.07355

in of H2O cm of H2O 2.54

mm of Hg in of H2O 0.03937

ISO 9001 Certified

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