Kane-May KM20REF Leitfaden

KM20REF

REFERENCE

THERMOMETER

GENERAL INFORMATION

It is recommended that you read the safety and operation instructions

before using this instrument.

WARNING

TO AVOID DAMAGE OR BURNS, DO NOT MAKE TEMPERATURE

MEASUREMENTS IN MICROWAVE OVENS.

CAUTION

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 ﬂexing can break thermocouple probe leads. To

prolong lead life, avoid sharp bends or kinks in the leads, especially

near the connector.

This instrument is manufactured in accordance

with the Company’s ISO 9001 QualityApproved

System.

This instrument complies with the

Electromagnetic Compatibility Directive

EN 61326-1.

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.

ISO 9001

FM 26700

CALIBRATION, CERTIFICATION AND SERVICE

Certiﬁcation

Comark can provide certiﬁcates of calibration for its whole product range, to suit

ISO 9000 and other quality assurance procedures, food hygiene regulations,

HACCPs and environmental regulations. Comark certiﬁcates are produced by

independent quality controlled processes which compare product performance

against agreed National Standards. For peace of mind and best practice Comark

recommend annual certiﬁcation/recalibration.

Two levels of certiﬁcation are available for infra-red temperature and non

temperature instruments, excluding humidity:- UKAS certiﬁcates via an external

accredited laboratory and NPL traceable certiﬁcates from the Comark calibration

laboratory.

Three levels of certiﬁcation are available for contact temperature and humidity

products and these are detailed here:

a) UKAS Temperature Certiﬁcation

The Comark UKAS (United Kingdom Accreditation Service) accredited

temperature calibration laboratory is one of the ﬁnest in the UK. Comark

UKAS certiﬁcates 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.

b) UKAS Humidity Certiﬁcation

In addition to the Comark temperature laboratory, the humidity laboratory

continues the tradition of high accuracy certiﬁcation 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 Certiﬁcation

Comark NPL certiﬁcates are traceable to the National Physical

Laboratory and can offer uncertainty as low as 0.3°C.

Conformance

Certiﬁcates of conformance can be supplied for new, serviced and recalibrated

instruments. These conﬁrm that instruments are within their original manufactured

speciﬁcation.

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 certiﬁcation, calibration and service facilities

please call Comark Customer Support or contact your local distributor.

0451

CHECKING THE ACCURACY OF

FOOD TEMPERATURE MEASURING SYSTEMS US-

ING THE KM20REF REFERENCE THERMOMETER

The KM20REF thermometer has been specially conﬁgured and

calibrated to provide an accurate and convenient method of checking

the calibration of food temperature measuring systems. Each KM20REF

is provided with a UKAS Certiﬁcate of Calibration from the Comark

UKAS accredited calibration laboratory, which is traceable to NPL

reference standards. This certiﬁcate deﬁnes the accuracy of the

KM20REF at designated points.

To maximise the stability of readings from the KM20REF or indeed any

other reference thermometer it is recommended that:-

a)it is only used as a reference thermometer

b) it is only used in ambient temperatures of +20°C ±5°C

c) it is protected from extreme temperature changes,

shock and vibration

d) that only an alkaline battery is used and that this is

replaced after 25 hours of use.

Food temperature measuring systems comprise two parts: the hand-

held meter and the sensor (probe). It is important that the accuracy of

the complete system (meter and probe) is regularly checked against the

reading from a reference thermometer. To maintain traceable records

both the meter and probe should be given unique serial numbers.

To compare the reading from a food thermometer with the reference

thermometer the following procedure may be applied:

Note: A separate procedure has been devised for National Health

Service catering operations, copies of which are available from Comark

Ltd - Part Number 12442.

Make sure that both the food thermometer and your KM20REF have

both been at ambient temperature (between +15°C and +25°C) for at

least one hour.

Take a glass or plastic beaker that can safely hold at least 0.5 litres of

ﬂuid.

Mix cold water and if needed ice cubes made from tap water to achieve

a mixture of water and/or ice (crushed ice is best) at a degree or so

below your desired comparison temperature, say +4°C or +7°C as

appropriate. You can use your reference thermometer for this.

(0.5 litres of water in a plastic beaker at +7°C with an ambient

temperature of 20°C exhibits a temperature rise of less than 0.1°C per

minute.)

Switch on both thermometers and insert both the probes into the water

to a depth of at least 50mm (2 inches). Hold the probes so that their tips

are very close together and use the probes to stir the water. The water

should be stirred in the centre of the beaker away from the sides. The

agitation rate should be approximately one rotation per second.

Once the KM20REF is displaying the required temperature of

comparison and this reading has been stable for 30 secs the reading of

the food thermometer can be taken and recorded.

If the reading from the food thermometer differs from the traceable

reading of the KM20REF by ±0.5°C or more, the food thermometer and

probe should be returned to the manufacturer for recalibration.

Note: The traceable KM20REF reading is obtained by adding the

appropriate adjustment. This adjustment is obtained by taking the

applied temperature and subtracting the corresponding measured

value. See the example below:

Applied Temperature Measured Adjustment

–18.0°C –18.2°C +0.2

0.0°C –0.1°C +0.1

+5.0°C +5.1°C –0.1

+8.0°C +8.1°C –0.1

+20.0°C +20.2°C –0.2

Note: In an ideal world your tests should be conducted at exactly

the same points as those indicated in the “Measured” column of your

KM20REF Certiﬁcate. For all practical purposes it is acceptable to

apply the adjustment factor provided the readings are ±1.0°C of the

“Measured” value.

If then when conducting the test the following results were achieved

KM20REF reading +8.1°C

Food thermometer reading +8.5°C

your results sheet would be ﬁlled in as follows:

EXAMPLE

CALIBRATION CHECK RESULTS SHEET

DATE: 2nd May 2001

TIME: 0930

AMBIENT TEMPERATURE: 21.3°C

KM20REF SERIAL NUMBER: 1234

FOOD THERMOMETER SERIAL NUMBERS:

INSTRUMENT: 0675

PROBE: 0231

KM20REF READING: +8.1°C

ADJUSTMENT –0.1°C

TRACEABLE TEMPERATURE: +8.0°C

FOOD THERMOMETER READING: +8.5°C

DEVIATION +0.5°C

ACCEPT/REJECT

TESTED BY:

CHECKED BY:

CALIBRATION CHECK RESULTS SHEET

DATE:

TIME:

AMBIENT TEMPERATURE:

KM20REF SERIAL NUMBER:

FOOD THERMOMETER SERIAL NUMBERS:

INSTRUMENT:

PROBE:

KM20REF READING: °C

ADJUSTMENT °C

TRACEABLE TEMPERATURE: °C

FOOD THERMOMETER READING: °C

DEVIATION °C

ACCEPT/REJECT

TESTED BY:

CHECKED BY:

Auto Switch Off

The KM20REF has an auto switch off function to conserve battery

life. The instrument will automatically switch off after approximately 3

minutes use. Press the ON/OFF button again to continue using the

instrument.

SPECIFICATION

SCALE °C

MEASUREMENT

RANGE Pt100 –100°C to +199.9°C

RESOLUTION 0.1°C

ACCURACY ±0.2°C

OPERATING RANGE 0 to +40°C

CERTIFICATE OF

CALIBRATION

DESIGNATED POINTS

FOR ACCURACY –18°C, 0°C, +5°C, +8°C, +20°C

EMC Tested to EN 61326-1

Criteria B performance

Comark Instruments

52 Hurricane Way,

Norwich, Norfolk, NR6 6JB United Kingdom

Tel: +44 844 815 6599

Fax: +44 844 815 6598

Email:[email protected]

Website: www.comarkinstruments.com

Comark Instruments

PO Box 500, Beaverton,

OR 97077 USA

Tel: 503 643 5204

Fax: 503 644 5859

Email:sales@comarkusacom

Website: www.comarkusa.com

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