It is recommended that you read the safety and operation
instructions before using this instrument.
TO AVOID ELECTRIC SHOCK DO NOT ALLOW
ANY PROBE OR SENSOR TO COME INTO
CONTACT WITH LIVE ELECTRICAL POWER
CONDUCTORS WITH VOLTAGES IN EXCESS OF
30V AC RMS OR 60V DC.
TO AVOID DAMAGE OR BURNS, DO NOT
MAKE TEMPERATURE MEASUREMENTS IN
MICROWAVE OVENS.
THE SYMBOL ON THE INSTRUMENT
INDICATES THAT THE OPERATOR MUST REFER
TO THE WARNINGS GIVEN HERE.
Temperature Measurement Probes
This precision instrument has been designed for use
with the extensive range of Comark temperature probes.
The use of other probes may impair the performance and
accuracy of the instrument. Full details of Comark probes
and sensors can be obtained from Comark Customer
Support department or your local distributor.
Repeated sharp exing can break thermocouple probe
leads. To prolong lead life, avoid sharp bends or kinks in
the leads, especially near the connector.
4
WARNING
CAUTION
This instrument complies with the Electromagnetic Compatibility Directive
EN61326-1.
Declarations of Conformity available.
Contact Comark Customer Support or your
local Distributor.
In line with its policy of continuous development, Comark
Instruments reserves the right to alter the instrument
specification without prior notice. Further information is
available from Comark Instruments or your distributor.
5
2. CALIBRATION, CERTIFICATION
AND SERVICE
Certication
Comark can provide certicates of calibration for its
whole product range, to suit ISO 9000 and other quality
assurance procedures, food hygiene regulations, HACCPs
and environmental regulations. Comark certicates are
produced by independent quality controlled processes
which compare product performance against agreed
National Standards. For peace of mind and best practice
Two levels of certication are available for infra-red
temperature and non temperature instruments, excluding
humidity:- UKAS certicates via an external accredited
laboratory and NPL traceable certicates from the Comark
calibration laboratory.
Three levels of certication are available for contact
temperature products and these are detailed here:
a) UKAS Temperature Certication
The Comark UKAS (United Kingdom Accreditation
Service) accredited temperature calibration
laboratory is one of the nest in the UK. Comark
UKAS certicates can offer the lowest uncertainty
of 0.01°C and provide independent proof of correct
calibration using equipment and procedures audited
by UKAS inspectors. The equipment used is fully
traceable to the National Physical Laboratory.
0451
b) UKAS Humidity Certication
In addition to the Comark temperature laboratory,
the humidity laboratory continues the tradition of
6
high accuracy certication and a wide range (25% to
90%RH) with uncertainties of 2.8% of reading. This
range also includes Dew point measurements.
c) NPL Traceable Certication
Comark NPL certicates are traceable to the National
Physical Laboratory and can offer uncertainty as low
as 0.3°C.
Conformance
Certicates of conformance can be supplied for new,
serviced and recalibrated instruments. These conrm
that instruments are within their original manufactured
specication.
Service/Repairs
Regular servicing and any required repairs, under warranty
or after, are available from the Comark Service Department.
For more information on all Comark certication, calibration
and service facilities please call Comark Customer Support
or contact your local distributor.
7
3. INTRODUCTION
This instrument is a portable 31/2 digit, compactsized digital thermometer designed to use external
type-K thermocouples as temperature sensors. It
is compatible with the full range of Comark type-K
thermocouple probes.
4. OPERATING INSTRUCTIONS
4.1 Selecting the Temperature Scale
Readings are displayed in either degrees
Celsius (°C) or degrees Fahrenheit (°F). When
the thermometer is turned on, it is set to the
temperature scale that was in use when the
thermometer was last turned off. To change the
temperature scale, press the °C or °F key.
4.2 Single-Thermocouple Temperature
Measurement
The thermometer displays the temperature
of the thermocouple that is connected to the
selected input. Press the T2 key to display the
temperature of the thermocouple connected to
the T2 input. Press the T1 key to display the
temperature of the thermocouple connected
to the T1 input. The selection cursor indicates
which input is selected.
4.3 Differential Temperature
Measurement
Differential temperature measurement
is selected by pressing the T1-T2 key.
This causes the thermometer to display
the temperature difference between the
two thermocouples (the temperature of
thermocouple T1 minus the temperature of
thermocouple T2). The selection is indicated by
the input selection cursor.
8
4.4 HOLD Mode
Pressing the HOLD key to enter the Data
Hold mode, the “D-H” annunciator is
displayed. When HOLD mode is selected, the
thermometer holds the present reading and
stops all further measurements.
Pressing the HOLD key again cancels HOLD
mode, causing the thermometer to resume
taking measurements.
4.5 MAX Mode
Press the MAX key to enter the MAX mode.
The thermometer then records and updates
the maximum value for that input. The MAX
annunciator appears on the display. Press
the MAX key again to exit the MAX recording
mode.
In the MAX mode, press HOLD key to stop
the recording, press HOLD again to resume
recording.
The maximum function is limited to use on
a single temperature scale at a time and
for readings which do not make a transition
through zero.
5. OPERATOR MAINTENANCE
5.1 Battery Replacement
Power is supplied by a 9 volt, PP3 battery.
The battery sign appears on the LCD display
when a replacement is needed. To replace the
battery, remove the three screws from the back
of the instrument and lift off the front case.
Exchange the battery in the protection tube
located at the top of the rear cover. Replace
the instrument front squarely with the rear
cover and secure with the three screws.
9
FRANÇAIS
CONSIGNES D’UTILISATION
DU THERMOMETRE NUMERIQUE KM340
1. GENERALITES
Nous vous conseillons de lire les consignes de sécurité et de
fonctionnement avant d’utiliser le thermomètre.
POUR EVITER LES CHOCS ELECTRIQUES VOUS NE
DEVEZ PAS METTRE EN CONTACT LES CAPTEURS OU
LES SONDES AVEC DES CONDUCTEURS ELECTRIQUES
DENUDES SOUMIS A UNE TENSION SUPERIEURE A 30V
CA RMS A 60V DC.
NE PRENEZ PAS LA TEMPERATURE DANS LES FOURS
A MICRO-ONDES POUR NE PAS CAUSER D’ACCIDENTS
OU DE BRULURES.
LE SYMBOLE SUR L’INSTRUMENT INDIQUE QUE
L’OPÉRATEUR DOIT SE RÉFÉRER AUX EXPLICATIONS
CI-DESSUS.
Sondes de mesure de la température
Cet appareil de précision a été conçu pour être utilisé
avec les sondes de température Comark dont un choix
étendu vous est proposé. L’utilisation d’autres sondes
risque de nuire à la performance et à la précision de
l’appareil. Pour toutes informations sur les capteurs et
les sondes Comark, contactez le service client Comark
ou votre distributeur local.
Le échissement brusque et répété du l de la sonde à
thermocouple peut le casser. Pour prolonger la durée
de vie du fil, évitez de le courber ou de le tortiller,
particulièrement près du connecteur.
ATTENTION
ATTENTION !
10
Cet appareil est en conformité avec la
Directive sur la Compatibilité Electromagnétique, EN61326-1.
La Déclaration de Conformité est
disponible auprès du service commercial
de Comark ou bien auprès du distributeur
local.
Conformément à sa politique de développement permanent,
Comark Instruments se réserve le droit de modifier sa
spécification sans avis préalable. Pour toutes autres
informations, contactez Comark Instruments ou votre
distributeur.
11
2. ETALONNAGE, HOMOLOGATION,
ET ENTRETIEN
0451
Certication
Le laboratoire Comark fournit des certicats d'étalonnage
pour l'ensemble de sa gamme de produits, en vue de
satisfaire à la norme ISO 9000, à d'autres procédures
d'assurance qualité, aux réglementations en matière
d'hygiène alimentaire et d'environnement ainsi qu'aux
HACCP. Les certicats Comark sont délivrés à l'issue
de contrôles de la qualité indépendants qui comparent
la performance d'un produit envers celle d'une norme
nationale convenue. Pour avoir l'esprit tranquille et être
dans les règles, Comark conseille de demander une
homologation / réétalonnage annuel(le).
Deux niveaux de certication sont disponsibles pour les
thermomètres à infra-rouge et les intraments ne mesurant
pas la température (mesure d’humidite exclue): certicat
UKAS via un laboratoire accrédité exterieur et certicate
NPL du laboratoire d’étalonnage Comark.
Trois types d'homologation sont proposés pour les
appareils de mesure de la température par contact:
a) Certication en température UKAS
Le laboratoire Comark de calibration en
température accrédité UKAS (United Kingdom
Accreditation Service) est un des meilleur du
Royaume-Uni. Les certicats UKAS de Comark
peuvent offrir une incertitude allant jusqu’à
0,01°C et fournissent les preuves indépendantes
d’une calibration correcte de part l’utilisation
d’équipements et de procédures audités par les
inspecteurs UKAS. La traçabilité de l’équipement
est assurée par le Laboratoire National de Physique
anglais (NPL).
12
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