DIGITAL THERMOMETER
OPERATOR’S MANUAL
51 206-3722
52 206-3738
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DIGITAL THERMOMETER
OPERATOR'S MANUAL
RS 51 206-3722
RS 52 206-3738
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INTRODUCTION
1-1 Unpacking and Inspection
Upon removing your new Digital Thermometer from its packing, you should have the following items:
1. Digital Thermometer.
2. K-type Bead Thermocouple.
3. Operator's Manual.
4. Protective Holster.
5. Belt Clip.
1-2 Front Panel
Refer to Figure 1 and the following numbered steps to familiarise yourself with the meter's front panel controls and
connectors.
1. Digital Display — The digital display has a 3-1/2 digit LCD readout (maximum reading 1999) auto polarity
decimal point, "=" , function symbol and unit annunciators.
2. Thermocouple Connectors — Allows connections of miniature thermocouple plugs (2 for model 52).
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3. Hold Switch — Used to hold the numeric reading. When pressed the HOLD annunciator is displayed.
Conversions are made but the reading is not updated.
This switch is limited to use on a single temperature scale at a time.
4. Power ON/OFF Switch — Turns the thermometer on or off.
5. Resolution Selector — Selects either 0.1 or 1 degree resolution.
6. °C °F Selector — Used to select the °C and °F units.
7. Max. Switch — Press once to display the max. reading in measurements, press again to cancel.
Disable this function before changing control keys to keep reading correctly.
This switch is limited to use on a single temperature scale at a time.
8. T1-T2 Switch — Selects the T1-T2 mode for measuring (52 only).
9. T2 Switch — Selects the T2 mode for measuring (52 only).
10. T1 Switch — Selects the T1 mode for measuring (52 only).
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1
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4
5
6
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Figure 1
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SPECIFICATIONS
2-1 General Specifications
This Thermometer conforms to the temperature / voltage tab les of the N ational Bureau o f Standards and to the
IEC Standards for K-type.
Display : 3 1/2 digit Liquid Crystal Display (LCD) with a maximum reading of 1999.
Polarity Indication : Automatic, positive implied, negative indicated.
Overrange Indication : "OL" or "-OL".
Low Battery Indication : " = " is displayed when the battery voltage drops below oper ating voltage.
Sampling Rate : 2.5 time / sec.
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2-2 Environmental Conditions
Operating Temperature : 0°C to 50°C, 0 to 75% R.H.
Storage Temperature : -20°C to 60°C, 0 to 80% R.H with battery removed from meter.
Temperature Coefficient : 0.15 x (Specified accuracy) / °C, < 18°C or > 28°C.
Power Requirements : 9V alkaline battery.
Battery Life : Alkaline 250 hours.
Dimensions (H x W x D) : 160mm x 64mm x 26mm without holster.
170mm x 74mm x 39mm with holster.
Weight (including battery) : 300 gms without holster.
430 gms with holster.
Accessories : 2 K-type bead thermocouples (52), 1 K-type bead thermocouple (51) battery (installed), operator's
manual and protective holster
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2-3 Electrical Specifications
(1) Accuracy is ± (% reading + number of digits) at 23°C ± 5°C less than 75% R.H for thermometer.
MODEL: 51
Measurement Range Resolution Accuracy Input Protection
-50°C ~ 199.9°C
0.1°C ± (0.2% reading + 1°C)
-58° F ~ 199.9°F
0.1°F ± (0.2% reading + 2°F)
-50°C ~ 200°C
1°C ± (0.3% reading + 2°C)
-58° F ~ 392°F
1°F ± (0.3% reading + 4°F)
200°C ~ 1000°C
1°C ± (0.4% reading + 2°C)
392°F ~ 1832°F
1°F ± (0.4% reading + 4°F)
1000°C ~ 1300°C
1°C ± (0.6% reading + 2°C)
1832°F ~ 1999°F
1°F ± (0.6% reading + 4°F)
60V d.c. or 24 Vr.m.s.
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MODEL: 52
Input protection: 9V DC or 6V rms.
Measurement Range Resolution Accuracy (T1 or T2)
-50°C ~ 199.9°C
0.1°C ± (0.2% reading + 1°C)
-58° F ~ 199.9°F
0.1°F ± (0.2% reading + 2°F)
-50°C ~ 200°C
1°C ± (0.3% reading + 2°C)
-58° F ~ 392°F
1°F ± (0.3% reading + 4°F)
200°C ~ 1000°C
1°C ± (0.4% reading + 2°C)
392°F ~ 1832°F
1°F ± (0.4% reading + 4°F)
1000°C ~ 1300°C
1°C ± (0.6% reading + 2°C)
1832°F ~ 1999°F
1°F ± (0.6% reading + 4°F)
Accuracy (T1 — T2)
± (0.5% reading + 1°C)
± (0.5% reading + 4°F)
± (0.5% reading + 2°C)
± (0.5% reading + 4°F)
± (0.5% reading + 2°C)
± (0.5% reading + 4°F)
± (0.6% reading + 2°C)
± (0.6% reading + 4°F)
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(2) Thermocouple Characteristics: K-type thermocouple.
50BK bead thermocouple:
1. Temperature Range : -40°C to 204°C (-40°F to 399.2°F).
2. Tolerances : ± (2.2°C or 0.75%) from 0°C to 204°C.
± (2.2°C or 2.0%) from 0°C to -40°C.
3. Wire Length : 1m, with miniature plug.
Teflon tape insulated.
OPERATION
This instrument is designed to use external K-type thermocouple as temperature sensor. Temperature indication
follows National Bureau of Standards and IEC 584 temperature / voltage tables for K-type thermocouple are
supplied with thermometer.
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WARNING
TO AVOID ELECTRICAL SHOCK, DO NOT USE THIS INSTRUMENT WHEN VOLTAGES AT THE MEASUREMENT SURFACE EXCEED 24V RMS OR AC OR 60V DC. (6Vrms AC OR 9VDC FOR 52) TO AVOID DAMAGE
OR BURNS, DO NOT MAKE TEMPERATURE MEASUREMENTS IN MICROWAVE OVENS.
3-1 Preparation and Caution before Measurement
1. Before measurement, warm up for at least 30 seconds, after connecting the thermocouple to the thermometer.
2. If the instrument is used near noise generating equipment, be aware that the display may become unstable
or indicate large errors.
3-2 Temperature Measurements
1. Connect the plug of the thermocouple to the connector of the thermometer.
2. Select the desired input mode, resolution and °C/°F.
3. Use the sensing point of the thermocouple to measure the surface to be measured.
4. Read the stable reading.
5.
"Warning: Do not measure the surface if the potential exceeds 60 Vd.c. or 24 Vr.m.s."
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MAINTENANCE
To keep the instrument clean, wipe the case with a damp cloth and detergent, do not use abrasives or solvents.
Any adjustment, maintenance and repair shall be made by a skilled person.
To maintain the thermocouple in good condition, observe the following precautions:
— Avoid excess bending.
— Do not overheat the thermocouple.
— Avoid chemical reactions that can damage the thermocouple.
BATTERY REPLACEMENT
The meter is powered by a single 9V battery. Refer to Figure 2 and use the following procedure to replace the
battery:
1. Turn the meter off. Remove the thermocouple connector.
2. Remove the holster.
3. Position the meter face down. Remove the screw from the battery cover.
4. Remove the battery cover.
5. Lift the battery from case top, and carefully disconnect the battery from battery connector leads.
6. Install a new battery.
7. Replace the battery cover. Reinstall the screw and replace the holster.
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BATTERY REPLACEMENT
Screw
9V Battery
Battery connector
Battery cover
Figure 2
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HOW TO USE THE TILT STAND AND HOLSTER
Swing the stand out for easier meter reading. Hang on a nail at the workbench.
United Kingdom
RS Components UK
PO Box 99, Corby
Northants NN17 9RS
Tel 01536 201234
Fax 01536 405678
France
Radiospares Composants
Rur Norman King, BP 453
60031 Beauvais Cedex
Tel +33 3 44 10 15 15
Fax +33 3 44 10 16 00
Italy
RS Components S.p.A.
Via Cadorna 66
20090, Vimodrone, Milano
Tel +39 2/27,425.1
Fax+39 2/27,425.207
Germany
RS Components GmbH
Hessenring 13b
64545 Morfelden-Walldorf
Tel +49 6105/401 –234
Fax +49 6105/401-100
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