Extech Instruments TM20 User manual

USERGUIDE



PortableThermometers

ModelsTM20,TM25,andTM26



TM20Thermometer

StandardProbe



TM25Thermometer

PenetrationProbe





TM26Thermometer

PenetrationProbe

NSFCertified

SoundReflector

2TM2x‐en‐GB_V2.15/15

Introduction

ThankyouforselectingtheExtechPortableThermometer.TheTMseriesthermometersareideal

forhomeuse.Measurethetemperatureofair,liquid,paste,orsemi‐solidmaterials.

The TM20 uses a standard temperature probe while the TM25 and TM26 are equipped with a

penetration probe for insertion into materials under

 test. The TM26 functions the same as the

TM25 but the TM26 includes a sound reflector for amplifying its beeper and is NSF certified,

meetingtherequirementsforuseinthefoodserviceindustry.

Thesedevices are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Guide,ProductUpdates,ProductRegistration,andCustomerSupport.



Specifications



Display  Multi‐functionLCD

Measurementrange TM20:‐40to70

C(‐40to158

F)

TM25/TM26:‐40to200

C(‐40to392

F)

Resolution 0.1

F

Accuracy ±0.5

C:0

to24

C

±1.0

C:‐20

to‐1

Cand25

to49

C

±2.0

C:‐40

to‐21

Cand50

to200

o

C

±0.9

F:32

to75

F

±1.8

F:‐4

to31

Fand76

to120

F

±3.6

F:‐40

to‐5

Fand121

to392

F

Protectionsafetyrating IP65ratingonmeterandsensors

Lowbatteryindication BatterysymbolappearsontheLCD

Powersupply CR20323Vbuttonbattery

MeterDimensions 86(L)x57(H)x30(D)mm[3.4(L)x2.2(H)x1.2(D)"]

Cablelength TM20cable:2.9m(9.6’)

  TM25/TM26cable:1.5m(5’)



3TM2x‐en‐GB_V2.15/15

Safety



InternationalSafetySymbols



Thissymbol,adjacenttoanothersymbolorterminal,indicatestheusermustrefertothe

manualforfurtherinformation.



Thissymbol,adjacenttoaterminal,indicatesthat,undernormaluse,hazardousvoltages

maybepresent



Doubleinsulation



GeneralSafety

o Pleasereadallsafetyandinstructionalinformation beforeusingtheseproducts.

o These products are intended for home use only on air, liquid, pastes, and semi‐solid

materials.

o Unauthorizedrepairs,modifications,orotherchangestotheproductsarenotsupported.

o Thisproductisnotintendedforusein

medicalpractice.



Caution!RiskofInjury!



o Keeptheseproducts,theirprobes,andbatteriesoutofthereachofchildrenandpets

o Useextremecautionwhenhandlingtheprobes

o Batteries must not be placed in fire, short circuited, taken apart, or discharged. Risk of

explosion!

o Batteries can be fatal if swallowed. Contact medical

emergency personnel if batteries are

swallowed.

o Batteries contain harmful acids. Low batteries should be changed as soon as possible to

preventdamagecausedbyleakingbatteries.



ProductSafety!



o Donotplacetheseproductsnearextremetemperatures,vibration,orshock

o Onlytheprobesareheatresistantto392

F(200

C)fortheTM25/TM26probeandto158

F

(70

C)fortheTM20probe,notthemetersthemselves

o Neverholdaprobedirectlyinoroverfire

o Donotimmersethemetersinanyliquid



4TM2x‐en‐GB_V2.15/15

12 3

Description



MeterDescription

1. Meter

2. LCDdisplay

3. PowerON/OFFbutton

4. MAX/MINbutton

5. ALARM/SETbutton

6. Temperatureunits/uparrowbutton

7. Meterstand/base

8. Sensorcabling

9. Sensortips

10. Probemountingbracket



Note:Wallmountaccesshole,magnet,andsoundreflector(TM26only)onrearofinstrument,

notpictured.



DisplaySymbols

1. Batterypowerstatus

2. Measurementreading

3. Alarmarmedsymbol

4. TemperatureDegreessymbol

5. HighAlarmsymbol

6. LowAlarmsymbol

7. CorFunitofmeasure

8. Data(Display)Hold

9. MAXreadingdisplay

10. MINreadingdisplay

11. ERROR(Batteryvoltagetoolowtodisplayaccurate

readings)



5TM2x‐en‐GB_V2.15/15

Operation

DisplayProtectiveFoil

The meter’s display is shipped with a protective foil covering. Please remove carefully before

use.



Poweringthemeter

Open the batterycompartment by loosening the two screws located on the back of the meter

(on either side of the magnet). Insert a new CR2032 3V lithium button battery and close the

cover.Ifa batteryisalready installed,removetheinsulation stripsothatthebattery canmake

propercircuitcontact.

The instrument is now ready for use. Press the ON/OFF key once to power the meter.  The

meter’sprevioussettingswillbepreserved.

All EU users are legally bound by the battery ordinance to return all used batteries to collection

pointsinyourcommunityorwhereverbatteries/accumulatorsaresold!Disposalinthehousehold

trashisprohibited!



Selecting

Funitsofmeasure

Pressthe

Fkeytoselectthedesiredtemperatureunitofmeasure.



MAX‐MINandHOLDFunction

 Tofreeze(hold) thedisplayedreading, presstheMAX/MINkey.Thecurrentreading willbe

heldonthedisplayandtheHOLDdisplayiconwillbevisible.

 PressMAX/MINagaintoviewtheMaximumreadingcapturedsincethelastreset;theMAX

indicatorwillbevisiblealongwiththeMAXreading.

 PressMAX‐MINagaintoviewtheMinimum(MIN)temperaturereading;theMINiconwillbe

visiblealongwiththelowestreadingcapturedsincethelastreset.

 Toreset the MAX andMINvalues pressandhold theMAX‐MIN button for3 seconds  while

the

MAXorMINiconisvisible.

 ToreturntonormaloperationpresstheMAX/MINkeyagain;theHOLD‐MIN‐MAXindicators

shouldnowbeoff.



SoundReflector(TM26only)

The TM26 includes a sound reflector on the rear of the unit. This device amplifies the audible

beepersoastobeheardfromgreaterdistances.



NSFCertified(TM26only)

TheTM26isNSFCertified,meetingtherequirementsforuseinthefoodserviceindustry.

6TM2x‐en‐GB_V2.15/15

TemperatureAlarms

Sethigh/lowalarmlimits asdescribedbelow.The meter willthenaudiblyandvisuallyalert the

userifeitherlimitisexceeded:



1. Pressthe ALARM/SETbutton oncefromthenormaloperatingmode; the upperlimit value

anditssymbol(uparrow)willflash.

2. Setthetemperaturelimitbypressingthe▲button(pressandholdforfastscrolling).

3. Nowuse theMAX/MIN buttonto activate/deactivatethe alarm(alarm symbolwill

appear

intheupperrighthandcorneroftheLCDwhenactivated).

4. VerifythesettingbypressingALARM/SET.

5. Performthesamestepsforthelowalarmlimit.



Aftersettingthealarms, the upperandlower limitsymbols(▲▼)willbedisplayedontheLCD

indicating that an

 upper and a lower alert value has been set. If the measured temperature

exceedseither limit, thealarm beeperwill sound for1 minute. The alarm beepericon andthe

correspondingarrowwillflash.Pressinganybuttonwillswitchoffthealarm.

When the temperature returns to the desired range

the audible alarm will stop sounding. The

arrowwillremainflashinghowevertoshowthatthetemperaturewashigherorlowerthanaset

valueatleastonceinthepast.Pressthe▲buttontoswitchOFFtheflashingarrow.



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

www.extech.com



Extech Instruments TM20, TM25, TM26 User manual

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