IRT25 User Manual

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EXTECHINSTRUMENTS

4IRT25‐en‐GB_V1.02/17

Operation

MeterPower

Themeterispoweredbytwo1.5VAAbatteries.Withfreshbatteriesinstalled,themeter

switchesONwhenthetriggerispulled.Thebatteriesarelocatedinthemeterhandle;pullthe

batterycompartmentlidawayfromthebodyofthemetertoopen.RefertotheMaintenance

sectionformoreBatteryInstallationinstructions.Thebatteryiconprovidesbatterystatus

indication.Replacethebatteriesassoonasthebatterystatus iconflashes.

SurfaceTemperatureMeasurements

1. HoldthemeterbyitsHandleGripandpointittowardthesurfacetobemeasured.Readthe

FieldofViewsectionbelowfordistancetotarget(spot)ratioinformation.

2. PullandholdtheTriggertoturnthemeteronandbegintestinginScanmode.Thedisplay

will

lightifthetwo1.5Vbatteriesaregood.Replacethebatteriesifthedisplay doesnotlight.

3. ReleasetheTrigger;thereadingwillholdforapproximately9seconds,afterwhichthemeter

willautomaticallyshutoff.

4. Themeterdefaultstotheprogrammedconditionsinusewhenthemeter

waslastswitched

OFF.Forexample,ifthelaserissettoONandthetemperatureunitsaresetto

Fatthetime

theunitisswitchedOFF,theunitwillswitchONandusethesamesettings.

Laser–ON/OFF

Pull the trigger and release.

PushandHOLDthe buttonforabout3secondstoswitchthelaserpointerONorOFF.

TheLasericonwillflashwhenthestatehaschanged.WhenthelaserisON,thelasericon will

appearontheLCD.Aimtheredlaserbeamapproximatelyahalfinchbelowthepointoftest

(pressingtheLaserbuttonagainturnsthelaseroff).

MAX‐MINMode

Pressthetriggerandrelease.

PresstheMAX‐MINbuttontoviewthemaximumtemperaturereading(MAX),pressagainto

viewthelowestreading(MIN).Pressandholdthe MAX‐MINbuttontoswitchtheMAX‐MIN

modeoff.

DisplayBacklight

Pressthetriggerandrelease.

Pressthebacklightbutton momentarilytoswitchthebacklightONorOFF.

Over‐rangeIndicators(OLand‐OL)

If the temperature measurement exceeds 779°F (415°C), the thermometer will display OL in

place of a temperature reading. If the temperature measurement is below‐25°C (‐13°F), the

thermometerwilldisplay‐OLinplaceofatemperaturereading.



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User Manual - Page 4