Extech Instruments HD780 User manual



 USERMANUAL



HeavyDutyManifoldPressureGauge

ModelHD780



AdditionalUserManualTranslationsavailableatwww.extech.com

2HD780‐en‐GB_V1.09/16

Introduction

CongratulationsonyourpurchaseoftheExtechInstrumentsHeavyDutyManifoldandPressure

GaugeModelHD780.Thisdeviceisaportable,digitalrefrigerantmanifoldmeterthatmeasures

highpressure,TypeKtemperatureandambienttemperature.Thismeterisshippedfullytested

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

website (www.extech.com) to check for the latest version of this User Manual, Translations,

ProductUpdates,CustomerSupport,andProductRegistration.



Features

 Measurespsi,kPA,inHg,cmHg,bar,plusTypeKandambienttemperature

 AutomaticTemperatureCompensation

 Autopowerofffeaturesavesbatterylife

 Easy‐to‐readLCDwithbacklight

 DataholdandMIN‐MAXreadings

 Includestwoheavydutypressurehoses,protectiverubberholster,twoType

Ktemperature

clamp probes, two general purpose Type K bead wire temperature probes, Universal AC

adaptorwithplugs(US,EU,UK,AUS),9Vbattery,andhardcase.



3HD780‐en‐GB_V1.09/16

MeterDescription



1. ProbeConnection

2. LCDDisplay

/SETButton

4. /UNITSButton

5. ENTERButton

6. °F/°C/Button

7. P(P1,P2selection)M(mode)Button

8. MAX/MINButton

9. H(Hold)Button

10. T(T1,T2selection)/M(mode)Button

11. POWERButton



RIGHTSIDEVIEW



1. T2Input

2. DC9VPowerAdapterInputSocket



4HD780‐en‐GB_V1.09/16



LEFTSIDEVIEW

1. T1Input

2. AmbientTemperaturesensor

3. Batterycompartment(Back)



DISPLAY

1. P1,P2andP1‐P2Pressure

2. Pressureunits

3. T1,T2,T1‐T2Temperature

4. Holdicon

5. Setupicon

6. MAX/MIN/AVGindicators

7. AmbientTemperature

8. Autopoweroffsymbol

9. Poweradapterindicator

10. LowBatteryIndicator

11. Offset

5HD780‐en‐GB_V1.09/16

Operation



ButtonDescriptions

PowerON/OFFthemeter

MAX/MIN SelectMAX/MIN/AVG

PM TogglebetweenP1andP2

H Freezethereadingsonthedisplay

TMTogglebetweenT1andT2(The middledisplayshowsthetemperatureplusthe

offset.SeetheSETUPsectiontoadjusttheoffsetvaluesforT1andT2)

/SET Press once to power ON/OFF backlight or press for 3 seconds to enter/exit

setupmode

/UNITS Change the pressure units, scroll though setup options, or increase the

displayedsetting

°F/°CChange the temperature units, scroll through setup options, or decrease the

displayedsetting

Press one time to enter setup option. Press two times to store the displayed

settingintomemory

DisplayBacklight

To turn the display backlight ON, momentarily press the backlight  button. To turn the

backlightoffpressthebacklight

buttononemoretime.



DataHold

Tofreezea displayed reading onthe LCD, press theHOLDbutton one time (theHOLDiconwill

appearonthebottomleftportionoftheLCD).ToexitHOLD,presstheHOLDbuttonagain.



UnitsofMeasure

The currently selected unit of measure is shown below the measurement value on the top

sectionsofthemeter’sLCD.Tochangetheunitofmeasure,pressthe/UNITSbuttonuntilthe

desiredunitofmeasureappears.



DisplayingPressure

Press Unit button to scroll through available pressure units of measure. Press P M button to

togglebetweenP1,P2,P1‐P2readings.



DisplayingTemperature

PressunitbuttontoselectC/F.PressT MbuttontotogglebetweenT1,T2,T1‐T2readings.The

displayshows dashes (‐ ‐ ‐)whenthere is no thermocouple connected.Thedisplay shows “OL”

whenthetemperaturebeingmeasuredisoutsidethethermocouplerange.



6HD780‐en‐GB_V1.09/16

ViewingMAX‐MIN‐AVG

Foragivenmeasurementsession,thismetercanrecordthehighest(MAX)andthelowest(MIN)

readingsforlaterrecall.

1. PresstheMAX‐MINbuttontoviewthecurrentMAXreadings(MAXiconappears).The

readingsonthedisplayarenowthehighestreadingslogged.

2. PresstheMAX‐MIN

buttonagaintoviewthecurrentMINreadings(MINiconappears).The

readingsonthedisplayarenowthelowestreadingslogged.

3. PressMAX‐MINbuttononcemoretoviewthecurrentAVGreadings(AVGiconappears).

Thereadingsonthedisplayarenowthelowestreadingslogged.

To

exitthe MAX‐MINmode,pressandholdtheMAX‐MINbuttonfor3seconds.TheMAX‐MIN‐

AVGiconswillswitchoffandthemeterwillreturntothenormaloperatingmode.



ZeroAdjust(Pressure)

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 H

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



SetupMode

Press and hold the /SET button for three seconds to enter the Setup Mode. Momentarily

pressingtheorbuttonswillcyclethroughoutthefunctions.Press toselectthedesired

function.SetupisdisabledinMIN/MAXmode.Theyare(inorder):



OFFSET………StoreoffsetsforT1andT2

SLP……Sleepmode

Note:PressandholdtheSETbuttonforthreesecondswhenintheSetModetoexit.



Offset

Use the offset option to compensate for a specific thermocouple temperature error or

mismatch.Theallowableadjustmentrangeis±5.0°C(9.0°F).

1. PlugthethermocoupleintotheT1orT2inputconnectorlocatedoneithersideofthemeter.

2. Placethethermocoupleinaknown,stableenvironment.

3. Allow

 the  readings to stabilize. The primary display shows the temperature, while the

bottomdisplayshowstheoffsetvalue.

4. Use the  ▲ and ▼ buttons to adjust the offset until the primary reading matches the

calibration temperature. Press

 button to store the value and move to the next setup

modeoption.

SleepMode(AutoPowerOFF)

With sleep mode active, the meter automatically powers off after 20 minutes of inactivity. To

defeatthisfeature,whileinSLPmode,press

toindicateON(sleepmodeON)orOFF(sleep

mode OFF). Press  or  buttons to make a selection. Press  to store the new setting in

memory.

7HD780‐en‐GB_V1.09/16

BatteryReplacement



WARNING: To avoid  electricalshock,remove the test leads,disconnectthe meter from

anycircuitandturnOFFthemeterbeforeopeningthecase.Donotoperatewithanopencase.

BatteryReplacement

When the low battery icon  appears on the LCD, the batteries must be replaced. Several

hours of accurate readings are still possible in this condition; however, batteries  should be

replacedassoonaspossible:

 Removethecoverfromtherearofthemeter.

 Replacetheone(1)9Vbatteryobservingpolarity.

 Replacethebatterycompartmentcover.

Note:ThemetercanalsobepoweredbyaDC9VPowerAdapter.Themeterwillbepermanently

poweredONwhentheDCadapterisusedasthepowersupply(thepowerbuttonfunctionis

disabled).



Safety:Pleasedisposeofbatteriesresponsibly;neverdisposeofbatteriesinafire,batteriesmay

explodeorleak.Ifthemeterisnottobeusedfor60daysormore,removethebatteryandstore

separately.



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.



8HD780‐en‐GB_V1.09/16

Specifications

Function Range Resolution Accuracy

Pressure‐14to0psi 0.1

(0.3psi)

0to200psi 0.1

(1.0psi)

200to400psi 0.1

(0.3%+1psi)

400to500psi 0.1

(0.3%+1.5psi)

‐96to0kPa 1

(2kPa)

‐0to1378kPa 1

(7kPa)

1378to2757kPa 1

(0.3%+7kPa)

2757to3447kPa 1

(0.3%+10kPa)

‐0.96to0bar 0.01

(0.02bar)

0to13.79bar 0.01

(0.1bar)

13.79to34.47bar 0.01

(0.3%+0.1bar)

‐28to0inHg 0.1

(0.4inHg)

0to407inHg 0.1

(2inHg)

407to814inHg 0.1

(0.3%+2inHg)

814to999.9 0.1

(0.3%+3inHg)

‐72to0cmHg 1

(1cmHg)

0to1034cmHg 1

(5cmHg)

1034to2068cmHg 1

(0.3%+6cmHg)

2068to2585cmHg 1

(0.3%+8cmHg)

TypeKthermocouple

(T1/T2Temperature)

‐60°Cto537.0°C

(‐76°Fto999.9°F)

0.1

(0.15%rdg+1.0°C)

(0.15%rdg+1.8°F)

AmbientTemperature

(SensorType:NTC)

0°Cto50.0°C

(32.0°Fto122.0°F)

0.1

1.0°C(2.0°F)

GeneralSpecifications

PressureConnectorType Standard¼NPTmaleflarefitting 

StatedAccuracy @25°C(77

o

F)<75%RH

Max.OverloadPressure 800psi

DataHold Freezesdisplayedreading

AutoPowerOFF Afterapprox.30minutesofinactivity(canbedeactivated)

Storageconditions ‐20to60

C(‐4to140

F);<80%RH(withbatteryremoved)

Operatingconditions 0to50

C(32to122

F);<75%RH

Batterypower 9Vbattery(Lowbatteryindicator)

Dimensions 23.5x7.6x5cm (9.3x3.0x2.0“)

Weight 460g(16.2oz.)

Allrightsreservedincludingtherightofreproductioninwholeorinpartinanyform

ISO‐9001Certified

Extech Instruments HD780 User manual

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