TECPEL DTM-305B Operating Instructions Manual

INTRODUCTION

This instrument is a portable 3½ digit, compact-sized
digital thermometer 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
thermocouples. One K-type thermocouple is sup­plied with the thermometer.

SAFETY INFORMATION

It is recommended that you read the safety and op­eration instructions before using the thermometer.
Designed to meet IEC-1010-1, CE-EMC.

WARNING

TO AVOID ELECTRICAL SHOCK, DO NOT USE
THIS INSTRUMENT WHEN VOLTAGES AT THE
MEASUREMENT SURFACE EXCEED 24V AC OR
60V DC.

WARNING

TO AVOID DAMAGE OR BURNS, DO NOT MAKE
TEMPERATURE MEASUREMENTS IN MICRO­WAVE OVENS.

CAUTION

Repeated sharp flexing can break the thermocouple
leads. To prolong lead life, avoid sharp bends in the
leads, especially near the connector.
The symbol on the instrument indicates that the
operator must refer to an explanation in this manual.

SPECIFICATIONS

ELECTRICAL

Temperature Scale:

Celsius or Fahrenheit user-selectable

Measurement Range:

-50°C to 1300°C, (-58°F to 2000°F)

Resolution: 1°C or 1°F, 0.1°C or 0.1°F
Accuracy:

Accuracy is specified for operating temperatures over
the range of 18°C to 28°C (64°F to 82°F), for 1 year,
not including thermocouple error.
±(0.3% rdg+1°C) -50°C to 1000°C
±(0.5% rdg+1°C) 1000°C to 1300°C
±(0.3% rdg+2°F) -58°F to 2000°F

Temperature Coefficient:

0.1x( specified accuracy ) per °C . ( 0°C to 18°C , 28°C to 50°C ).

Input Protection:

60V dc or 24V rms ac maximum input voltage on
any combination of input pins.

Reading Rate: 2.5 times per second.
Input Connector:

Accepts standard miniature therm ocouple connec­tors (flat blades spaced 7.9mm,center to center).

ENVIRONMENTAL

Ambient Operation Range:

0°C to 50°C, (32°F to 122°F)

Storage Temperature:

-20°C to 60°C, (-4°F to 140°F)

Relative Humidity:

0% to 80% (0°C to 35°C) (32°F to 95°F)
0% to 70% (35°C to 50°C) (95°F to 122°F)

GENERAL

Display:

3½ digit liquid crystal display (LCD) with maxi­mum reading of 1999

Battery:

Standard 9V battery (NEDA 1604,IEC 6F22)

Battery Life:

100 hours typical with carbon zinc battery
200 hours typical with alkaline battery

Dimensions: 184mm (H) x 62mm (W) x35mm (D)
Weight: 10.6oz (300g) including holster
Supplied Probe:

4-foot type “K” thermocouple bead probe (teflon
tape insulated). Maximum insulation temperature
260°C (500°F). Probe accuracy ±2.2°C or ±0.75%
of reading (whichever is greater).

OPERATING INSTRUCTIONS

DIGITAL THERMOMETER

C

°1°

0.1/ F°/

MIN

MAX/

HOLD

ON OFF

THERMOMETER

OFFSET

OPERATING INSTRUCTIONS

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.

Selecting the Display Resolution

The thermometer allows two choices of resolution:

High resolution: 0.1°C or 0.1°F
Low resolution: 1.0°C or 1.0°F

To select the alternate display resolution, press the
corresponding “1°” or “0.1°” key.

The 0.1° resolution is applicable for temperature
measurements below 200°C or 200°F.

HOLD Mode

Pressing the HOLD key to enter the Data Hold mode,
the “HOLD” annunciator is displayed. When HOLD
mode is selected, the thermometer holds the present
readings and stops all further measurements.
Pressing the HOLD key again cancels HOLD mode,
causing the thermometer to resume taking
measurements.

MIN/MAX Mode

Press MIN / MAX once to begin recording MIN and
MAX. Press MIN / MAX to select MIN or MAX.
Hold down for 2 seconds to exit MIN / MAX
function.

OFFSET ADJUSTMENT

The OFFSET control is set at the factory to allow for
the variations found in standard thermocouples. By
adjusting the OFFSET control, you can optimize
measurement accuracy for a particular thermocouple
at a particular temperature.

Adjusting for Accurate Measurements

1.Connect the thermocouple to the input connector
and turn the thermometer ON, then press the 0.1°
key to select the high display resolution.

2.Place the thermocouple in a known , stable tem-

perature environment at or near the temperature
you wish to measure , and allow the readings to
stabilize.

3.Slowly adjust the OFFSET control so that the ther-

mometer reading matches the temperature of the
known environment. Leave sufficient time be­tween adjustments to allow for measurement lag.

4.The calibration of the thermometer-thermocouple
combination is now optimized for measurements
near the temperature measured in step 2.

Resetting the OFFSET Control

To return the OFFSET control to the factory setting
without having to recalibrate the thermometer, per­form the following procedure:

1.Connect a thermocouple that is in good working
order to the input that is to be adjusted.

2.Place the thermocouple in an ice-water bath and
allow the readings to stabilize.

3.Slowly adjust the OFFSET control until the ther­mometer reads 0°C (32°F)

Probe Detector

The red LED will be ON when no K-type
thermcouple probe is inserted into the TEMP input
of the meter, and will be OFF after K-type
thermocople probe is inserted. If the red LED stays
ON when thermocouple probe is attached, check the
thermocouple probe which might be damaged.

OPERATOR MAINTENANCE

WARNING

TO AVOID POSSIBLE ELECTRICAL SHOCK,
DISCONNECT THE THERMOCOOUPLE
CONNECTORS FROM THE THERMOMETER
BEFORE REMOVING THE COVER.

Battery Replacement

Power is supplied by a standard 9 volt battery (NEDA
1604,IEC 6F22). The “ ” appears on the LCD dis­play when replacement is needed. To replace the
battery, remove the screw from the battery cover of
the meter. Remove the battery and replace with a new
equivalent 9 volt battery.

P/N: 7000-1699A