Digi-Sense Dual J-T-E-K 91100-40 User manual

Cole-Parmer Instrument Co.
625 East Bunker Court
VernonHills,IllinoisU.S.A.60061-1844
[phone]
[phone](Fax)
800-323-4340
www.coleparmer.com
e-mail:[e-mail]
A-1299-0632
Edition07
68X309908 Rev.0 08/03
THERMOCOUPLE THERMOMETER
Dual J-T-E-K®
MODEL NO. 91100-40
®

CERTIFICATE OF
CONFORMANCE
Thisthermometerwascalibratedusingequip-
menttraceabletotheNationalInstituteofStan-
dardsandTechnology(NIST).
Thisinstrument conforms to
NISTmonograph175 revisedto
ITS-90.
Theaccuracyofthethermometer at the time
ofcalibrationwaswithinspecificationsstated
intheoperatingmanual.
ModelNo.:__________________________
SerialNumber:______________________
Dateplacedinservice:________________
To purchase an NIST certificate of traceabil-
ity with test data and test date for meter and
probepleasecontact:
Cole-Parmer Instrument Company
625 East Bunker Court
Vernon Hills, Illinois, U.S.A.60061-1844
Toll-free: 800-323-4340

1
INTRODUCTION
Thisversatilehand-heldinstrumentprovideshighly
accuratetemperaturemeasurementsinCelsius,or
Fahrenheit, using a wide range of thermocouple
types. The temperature range for each type ther-
mocoupleislisted in the following chart.
TYPE °C°F
J –200to1000 –328to1832
K –250to1372 –418to2501
T –250to 400 –418to 752
E –250to1000 –418to1832

2
Theinstrumentisdesignedforeasyoperationand
includesthefollowingfeatures:
•Operatorselectionoftemperaturescale
•Resolutionof0.1°from −150°Cto999.9°C
(−238°Fto999.9°F)
•LCDwiththree four-digitdisplays
• Two (2-blade female) ANSI mini-connectorinputs
•Holdfeaturefortemporarily retaining a reading
•Two-pointfieldcalibrationcapability
•Lowbattery warning
• Stores up to 25 readings
•Scrollsthroughallstored readings
•DisplaysMIN andMAX readings
•ScrollsbetweenT1,T2, andT1-T2 readings
•Built-intiltstandforeasyhands-freeoperation

3
SAFETY PRECAUTIONS
THIS INSTRUMENT IS
DESIGNED TO ACCEPT
LOW LEVEL SIGNALS SUPPLIED BY STAN-
DARD THERMOCOUPLES. UNDER NO CIR-
CUMSTANCES SHOULD THE INPUTVOLTAGE
EXCEEDTHE SPECIFIED 50V RMS.
DO NOT USE OR STORE
THIS INSTRUMENT IN
MICROWAVE OVENS OR ANY ABNORMALLY
HOT OR COLD AREAS.
WEAKBATTERIES SHOULD
NOT BE LEFT IN THE IN-
STRUMENT. DEADBATTERIESCANLEAKAND
CAUSE DAMAGE TO UNIT.
VOLTAGES PRESENT AT
THE THERMOCOUPLES
MAYALSOBEPRESENTATTHEBATTERYTER-
MINALS. ALWAYS DISCONNECTTHETHERMO-
COUPLEWHEN CHANGING BATTERIES.
TO PREVENT IGNITION OF
A HAZARDOUS ATMOS-
PHERE,BATTERIES MUSTONLYBECHANGED
INANAREAKNOWNTOBENON-HAZARDOUS.
AFIN DE PREVENIR
L’ INFLAMMATION
D’ATMOSPHERES DANGEREUSES, NE
CHANGER LES BATTERIES QUE DANS DES
EMPLACEMENTS DESIGNES NON DAN-
GEREUX.
TOPREVENTIGNITIONOF
A HAZARDOUS ATMOS-
PHERE BY ELECTROSTATIC DISCHARGE,
CLEAN WITH DAMP CLOTH.
WARNING
WARNING
CAUTION
CAUTION
WARNING
DANGER
AVERTISSEMENT

4
SPECIFICATIONS
THERMOCOUPLE PROBES
Type Temperature Range
Type J: –200°C to 1000°C (–328°F to 1832°F )
Type K: –250°Cto1372°C(–418°Fto2501°F)
TypeT: –250°C to 400°C (–418°F to 752°F )
Type E: –250°Cto1000°C(–418°Fto1832°F)
Accuracy > –150°C:±0.1% of reading, ±0.4°C
(±0.7°F)
Accuracy < –150°C: ±0.25% of reading, ±1°C
(±2°F)
Linearization:Conforms to NIST monograph175
revised to ITS-90.
Input Protection: 50Vrms
Conversion Rate: Reading 0.6 seconds per
update.
Connector:Two-bladefemaleANSImini-connector
inputs.
Battery
Size: Two AA, 1.5V alkaline ANSI-L40,
IEC-LR6
Life: 750hourscontinuous, typical
Display: LCD with 0.4 in high characters main
readout and 0.2 in high characters secondary
displays, 4 digits each display plus various an-
nunciators.

5
Temperature/Humidity Range
Operating:
StatedAccuracy: 18°Cto 28°C
(64°Fto 82°F)
UsefulRange: 0°Cto 40°C
(32°Fto 104°F)
Storage: −40°Cto65°C
(−40°Fto149°F)
Humidity: 10%to90%
(non-condensing)
Dimensions
3 cm D x 8.4 cm W x 15.8 cm H
(1.2 in x 3.3 in x 6.2 in)
Weight with batteries: 227 grams(8ounces)
Ingress protection: MeetsIEC-529 IP-54 fordust
andwater-resistantenclosures.
Intrinsic safety
Thisproductis energylimitedforintrinsicallysafe
operationinhydrogen atmospheres per Class I,
Division 1, Groups A, B, C, and D hazardous
(classified)locationsforULperUL913andCSA
per C22.2 No. 0-M1982 and No. 157-M1987.
Maximumsurface temperature:135°C(T4);UL
fileNo.E182612 (1997).
Compliance (For CE Mark)
EN61326-1/A1:1998 (EU EMC Directive)

6
BATTERY INSTALLATION AND
REPLACEMENT
WEAKBATTERIES SHOULD
NOT BE LEFT IN THE
INSTRUMENT. DEAD BATTERIES CAN LEAK
AND CAUSE DAMAGETO UNIT.
VOLTAGES PRESENT AT
THE THERMOCOUPLES
MAYALSOBEPRESENT ATTHEBATTERYTER-
MINALS. ALWAYSDISCONNECTTHETHERMO-
COUPLEWHEN CHANGING BATTERIES.
TO PREVENT IGNITION OF
A HAZARDOUS ATMOS-
PHERE,BATTERIESMUSTONLY BE CHANGED
INANAREAKNOWNTOBE NON-HAZARDOUS.
AFIN DE PREVENIR
L’ INFLAMMATION
D’ATMOSPHERES DANGEREUSES, NE
CHANGER LES BATTERIES QUE DANS DES
EMPLACEMENTS DESIGNES NON DAN-
GEREUX.
CAUTION
DANGER
WARNING
AVERTISSEMENT

7
Ifbattery indicator turns on, battery lifeis approxi-
mately8to10hours.Thebatteryindicatorwillstart
blinkingwithlessthan1hour of liferemaining.
ATTHISPOINT BATTERY MUST BE CHANGED.
IF BATTERY VOLTAGE GOES TOO LOW, DIS-
PLAY WILL GO BLANK.
See SPECIFICATIONS for battery type.
1. Beforechangingbattery,turn instrumentoffand
disconnectthermocouple(s).
2. Loosen screw and lift battery cover off back of
case.
3. RemovethetwoAAbatteries.
4. Insert twonewbatteries observingpolarity.
5. Install cover and tighten screw.

8
CONNECTING A THERMOCOUPLE
Note:Be sure yourinstrument setting (J,T,EorK)
matchesthethermocoupleyouareusing.
Usethecorrectthermocouple type foryourinstru-
ment. Using an incorrect thermocouple type will
result in erroneous readings. Thermocouples are
colorcodedbytypeusingtheNorthAmericanANSI
color code as follows:
TYPE COLOR
J Black
K Yellow
T Blue
E Purple
Thermocoupleconnectorshaveonewidebladeand
onenarrowblade. Donotforce connector in back-
wards. Connect thermocouple(s) to receptacle at
topofinstrument.
If only one thermocouple is being used, it can be
connectedtoeitherT1orT2. The thermometerwill
automaticallydeterminewhichconnectorisbeing
used. Whentwothermocouples are used,connect
one to the T1 connector and one to the T2
connector.
Thermocouple wiring polarity must be correct. If
readings decrease as the temperature increases,
thethermocouplewiresmaybe reversed. Thered
wire is negative for thermocouple wires manufac-
turedinNorthAmerica.

9

10

11

12
QUICK SETUP
Note:Review warnings on page 6.
1. Installbatteries.
2. Connectthermocouple(s).
3. Press the ON/OFF key. The thermometer per-
forms a self-test and all display digits and indi-
cators, as shown below, should remain on for
approximately one second.
4. Use J-T-E-K key to select the correct thermo-
couple and the °C/°F key to select the desired
scale.
This message also appears if a thermocouple is
broken. Nomeasurements can be madewhilethis
warning is displayed.
If a thermocouple has not yet been connected to
oneormoreinputs on the instrument, youwill see
thisdisplay:

13
COMPLETE SETUP PROCEDURE
Thesetupprocedureis usedtoselectthetempera-
turescale,resolution,andthermocouple type.
NOTE
Selected settings are stored in memory and will
remain in memory even after power is turned off,
orwhilebatteries are being replaced.
SELECTINGTEMPERATURE SCALE
Select °C or °F by pressing the °C/ °F key. Each
time the key is pressed the temperature scale will
switch.Switching between °C and °F can be done
atanytimeduring operation.
Eachtimeyouturn the instrument on, it will power
up with the same settings that were set when the
unit was last turned off.
SELECTING RESOLUTION
Select 0.1°or 1°resolution by pressing the
0.1°/1° key. This keytogglesbetweenthetworeso-
lutions. Whenmeasuringtemperatureabove999.9°
or below −150°C the thermometer automatically
autorangesto1°resolution.
SELECTINGTHERMOCOUPLETYPE
Select the thermocouple type, either J,T, E, K, by
pressing the J-T-E-K key. Each push of the key
will step to the next type thermocouple. The se-
lected thermocouple type is indicated by the an-
nunciators in the lower right corner of the display.
Continue with the OPERATING PROCEDURES
sectionorturn the instrument OFF bypressingthe
ON/OFF key again. The display will blank.

14
OPERATING PROCEDURES
The unit will always power up with the upper dis-
play showing T1 unless T1 is not connected. If
only T2 is connected at power up, the upper dis-
play showsT2 and the lower left display indicates
T1isopen. Ifthermocouples are not connected to
T1 orT2 at power up, the upper display indicates
anopenT1 andthelowerrightdisplayindicatesan
openT2.
If you are in single probe mode and the probe is
movedtotheother connector or torestorethedual
probe mode, turn power OFF then back ON.
Foroptimumoperation,allowaboutoneminutefor
ambient temperature stabilization. If the unit has
beenstoredatan extremeambientcondition,more
timemay be needed.
BASICTEMPERATURE MEASUREMENTS
Check that the thermometer is turned on, the
probe(s)connected,thedesiredresolution0.1°or
1° is selected, and the desired scale °C or °F, is
selected.
Single Probe Measurements
Thethermometer willautomaticallydetermineifT1
orT2 connection is being used.
Initiallytheupper displaywillindicatethemeasured
temperatureandtheannunciatorwill indicatewhich
probeismakingthemeasurement. Oneofthelower
displayswillindicateopenandtheannunciator will
indicate which probe is open. Pressing the T1/T2
keywillcausethe thermometertogointothe single
probedifferential mode described later.
Temperatures > 999.9°have a resolution of1°and
therefore no decimal will be present.

15
Dual Probe Measurements
Thethermometerwillautomaticallydetermineifone
or two thermocouples are connected. When two
thermocouplesareconnected,theuppermain dis-
play will initially show T1 and the lower right dis-
play willshowT2. Pressing the T1/T2keyoncewill
cause the upper display to showT2 and the lower
left display to show T1. Pressing the
T1/T2 key again will cause the upper display to
showT1-T2, the lower left displaytoshowT1,and
the lower right display to showT2.
MAXIMUM READINGS
Themaximumreadingfunctiondisplaysthemaxi-
mumreadingsincepower uporsincethelasttime
the clear function was used. The maximum read-
ingfunctionis ideal formonitoringunattendedop-
erationswhile continuallydisplayingevery tempera-
ture change that occurs.The maximum and mini-
mum values are sensed and automatically stored
until you are ready to observe the reading.
Donotturn the instrumentOFFwhena maximum
or minimum temperature value may be needed;
MAX/MIN memory contents will be lost. Factory
Calibrationwillbemaintained.

16
Single Probe Measurements
Thedisplayedinformation dependsonwhetheryou
areusingasingleprobeinthedualprobemodeor
have changed to thesingleprobedifferentialmode
bypressing theT1/T2 key.
Ifyouareusinga singleprobeandin thedualprobe
mode, momentarily press the MAX ▲▲
▲▲
▲key. The
MAXannunciatorturnson.If theprobeis connected
to T1 the maximum reading will be shown in the
lower left display. If the probe is connected to T2
the maximum reading will be shown in the lower
right display.If a higher maximum occurs while in
theMAXmode,thehigherreadingwillbedisplayed.
To turn off the maximum reading, press the MAX
▲▲
▲▲
▲key again.
If you are in the single probe differential mode,
momentarily press the MAX ▲▲
▲▲
▲key. The MAX and
MIN annunciators turn on and both the maximum
andminimumreadingsappear inthelowerdisplays.
The minimum will be on the left display and the
maximumon the rightdisplay.Ifahighermaximum
or lower minimum occurs while in the MAX mode,
thehigherreadingwillbedisplayed. To turnoffthe
maximum reading, press the MAX ▲▲
▲▲
▲key again.

17
Dual Probe Measurements
Momentarily press the MAX ▲▲
▲▲
▲key. The MAX an-
nunciator turns on, and both maximumT1 and T2
readingsappearinthelower display. TheT1 read-
ing is on the left display and the T2 reading is on
therightdisplay. Press MAX ▲▲
▲▲
▲keyagaintocancel.
Clearing a Maximum Reading
Press the CLEAR key then the MAX ▲▲
▲▲
▲key. The
maximummemorywillbecleared.
MINIMUM READINGS
The minimum reading function displays the mini-
mumreadingsincepower uporsincethelasttime
theclearfunctionwasused. Whilecontinuallydis-
playingeverytemperaturechangethatoccurs,the
maximum and minimum values are sensed and
automaticallystoreduntilyou arereadytoobserve
thereading.
Donotturn the instrument OFF whena maximum
or minimum temperature value may be needed;
MAX/MINmemory contents will be lost.

18
Single Probe Measurements
Thedisplayedinformationdependsonwhether you
areusingasingleprobeinthedualprobemodeor
have changed to thesingleprobedifferentialmode
bypressing theT1/T2 key.
Ifyouareusinga singleprobeandin thedualprobe
mode,momentarilypresstheMIN ▼▼
▼▼
▼key. The MIN
annunciator turns on. If the probe is connected to
T1theminimumreadingwillbe showninthelower
leftdisplay. If theprobeisconnectedtoT2themini-
mum reading will be shown in the lower right dis-
play. If a lower minimum occurs while in the MIN
mode, the lower reading will be displayed. To turn
off the minimum reading, press the MIN ▼▼
▼▼
▼key
again.
If you are in the single probe differential mode,
momentarily press the MIN ▼▼
▼▼
▼key. The MAX and
MIN annunciator turns on and both the maximum
andminimumreadingsappear inthelowerdisplays.
The minimum will be on the left display and the
maximum on the right display. If a lower minimum
orhighermaximumoccurs while in the MIN mode,
the new readings will be displayed. To turn off the
minimum reading, press the MIN ▼▼
▼▼
▼key again.
Dual Probe Measurements
Momentarily press the MIN ▼▼
▼▼
▼key. The MIN an-
nunciator turns on, and both minimumT1 andT2
readingsappearinthelower display. TheT1read-
ing is on the left display and the T2 reading is on
the right display. Press the MIN ▼▼
▼▼
▼key again to
cancel.
Clearing a Minimum Reading
Press the CLEAR key then press the MIN ▼▼
▼▼
▼key.
Theminimummemory will be cleared.