General DT80-1 User manual

DIGITAL THERMOCOUPLE

THERMOMETERS

USER’S MANUAL

DT80-1 and DT80-2

Please read this man al caref lly and thoro ghly before sing this prod ct.

Single

Therm c uple

Dual

Therm c uple

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . 5

Display Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Function Keys Overview . . . . . . . . . . . . . . . . . . . . . . . 7

pecific Operating Instructions . . . . . . . . . . . . . . 8 –9

pecifications . . . . . . . . . . . . . . . . . . . . . . . . . . 10 – 11

Maintenance & Troubleshooting . . . . . . . . . . . . . . . . 11

Replacing the Battery . . . . . . . . . . . . . . . . . . . . . . . . 11

Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 11

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . 12

Return Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

INTRODUCTION

Thank you for purchasing a Thermocouple type J/K

digital thermometer from General Tools & Instruments.

We suggest that you read this user’s manual carefully

and thoroughly before using the instrument.

The DT80-1 and DT80-2 are thermocouple-type J/K

digital thermometers. The DT80-1 is designed to be used

with a single thermocouple; the DT80-2 is designed to be

fed by two thermocouples configured to deliver a

temperature differential.

Each model uses a high-resolution analog-to-digital

converter chip and a microprocessor to convert input

temperature signals to digital form and display them on

a dual-display, 5-digit black-and-white liquid crystal

display measuring 1.5 by 1.5 inches.

These two thermocouple thermometers have a

measurement accuracy of ±(0.05% of reading + 1.4°F)

with an unmatched measurement range. For example,

the DT80-1 and DT80-2 can measure and read out

temperatures from -328° to 1922°F (-200° to 1050°C)

using a J-type thermocouple, and temperatures from

-328° to 2498°F (-200° to 1370°C) using a K-type

thermocouple. This very wide measuring range, plus a fast

response time make these thermocouple thermometers

suitable for a wide range of commercial and industrial

applications requiring measurement of very high and low

temperatures. Examples include applications in the food

and chemical processing industries, VAC (heating,

ventilation and air-conditioning), power generation, and

paper production.

Simplicity is another asset of thermocouple

thermometers. Thermocouples work by measuring the

potential difference produced at the junction of two wires

made of different metals but exposed to the same

temperature. Since the junction is very small, a

thermocouple thermometer can be used to measure the

temperature at a point reachable by a probe. The probes

used are inexpensive and easily replaceable.

KEY FEATURES

• Dual 5-digit liquid-crystal display

• Measurement range: -328° to 1922°F

(-200° to 1050°C) using a J-type thermocouple;

-328° to 2498°F (-200° to 1370°C)

using a K-type thermocouple

• Measurement accuracy:

±(0.05% of reading +1.4°F)

• Operating temperature range:

40° to 104°F (5° to 40°C)

• Power Source: 1 “9V” battery

O ERATING INSTRUCTIONS

Familiarize yourself with the nomenclature in the

following two illustrations before using the DT80-1 or

DT80-2.

BACK, FRONT AND TO VIEWS

Thermocouple T1 input

Thermocouple T2 input (DT80-2 only)

 Display (see next illustration)

 Function keys

 Battery cover

 Battery compartment

DIS LAY ELEMENTS

Auto power off icon



Low battery indicator



old (freeze) display indicator



Offset change indicator



Enable Maximum, Minimum and Average recording;

also indicates Current Mode.



Offset Setup Mode indicator



Limit indicates that the alarm function is enabled;

i and Lo indicate the reason why alarm sounded.



T1 - T2: Indicates differential temperature mode

(DT80-2 only).



Primary display: Indicates state of channels, selected

temperature unit and thermocouple type.



Secondary display: Indicates state of channels, se-

lected temperature unit and thermocouple type.

Note: When a thermocouple is not plugged into the

instrument, the display reads “OL”

FUNCTION KEYS OVERVIEW

Pressing toggles between Celsius and Fahrenheit

temperature units (scale chosen is saved upon

shutdown and becomes the default of next power

up cycle).

Pressing enables/disables holding (freezing) of

display and updating of data. Pressing and holding

enables/disables auto power off function

(indicated by ).

In normal operating mode, toggles to select J- or

K-type thermocouple. In offset setup mode,

increases the offset value.

In normal operating mode, selects display of

maximum, minimum, or average temperatures. In

offset setup mode, pressing saves setting

and exits that mode.

Pressing and holding enters offset setup mode.

In normal operating mode, pressing turns

instrument on or off. In offset setup mode,

pressing decreases offset value.

(DT80-2 only). Pressing enables/disables T1 minus

T2 function. Pressing and holding swaps T1 and

T2 readings between primary and secondary

displays.

T1-T2

T1➝T2

➝

TYPE

HOLD

MAX

MIN

REL

ºC/ºF

MAX

MIN

S ECIFIC O ERATING

INSTRUCTIONS

To display maximum, minimum or average

temperature

, push the key repeatedly until the

corresponding icon appears above the reading in the

primary display. The primary display shows the current

channel reading of MAX, MIN or AVG. The secondary

display shows the current channel reading of actual

temperature. When the instrument powers off, the value

chosen is saved and becomes the default value for the

next power up cycle.

To select the thermocouple type

, press the

key (in normal operating mode) until the correct letter

(K or J) appears on the left side of the primary display. In

the case of the DT80-2, use the key to also set the

correct thermocouple type in the secondary display. Both

the DT80-1 and DT80-2 will save their setting(s) upon

shutdown and make them the default when they next

power up.

To hold (freeze) the display and stop updating

measurements

, press the key. Press it again to

unfreeze the display. When the OLD function is enabled,

all function keys (except for the key) are disabled.

Using the REL key to subtract readings. Pressing the

key cancels out a relative reading, changes the

display to “0” and saves the previous reading

as the standard relative reading. For example, if

the primary display is reading 25°C, pressing the

key changes the display to “0” and saves 25°C as

T1-T2

T1➝T2

➝

TYPE

HOLD

MAX

MIN

REL

the standard relative reading. Then, if the temperature

rises to 30°C, the display will show 5°C (30° – 25°C).

If the temperature falls to 20°C, the display will show -

5°C (20° – 25°C). Pressing the key again disables

this function and restores the actual temperature reading

to the display.

The primary display shows the current channel reading of

REL. The secondary display shows the current channel

reading of actual temperature.

In the case of the DT80-2, to show the current channel

reading of REL on the secondary display, press and hold

the key to swap T1 and T2.

To display T1 minus T2 temperature (DT80-2 only),

press the key. Press the key again to disable this

function.

The primary display shows the T1-T2 temperature. The

secondary display shows the current channel reading of

actual temperature. To swap channels, press and hold

the key.

To enable/disable the 15-minute Auto Power Off

function, press and hold the key (with the

instrument in normal operating mode) until the

appears or disappears at the upper left of the screen.

To power the instrument on and off, press the key.

If pressing the key fails to shut off the unit, that means it

is in offset setup mode. Exit this mode by pressing the

key, and then push the key again.

T1-T2

T1➝T2

➝

T1-T2

T1➝T2

➝

T1-T2

T1➝T2

➝

REL

HOLD

MAX

MIN

To compensate for thermocouple error, you must first

set the offset value. To do so (recommended each time

the thermocouple probe is changed):

1. Press and hold the key.

2. Use the and keys, respectively, to increase

or decrease the offset value. The allowable adjustment

range is ±9°F (±5°C).

3. Press the key to save the setting and exit offset

setup mode.

To adjust the offset of the secondary channel in the

DT80-2, press the key and repeat steps 2 and 3.

The instrument will automatically save the offset value

upon shutdown, and default to it upon the next startup.

S ECIFICATIONS

• Display: dual 5-digit LCD

• Temperature units: Degrees Celsius or Fahrenheit

• Display resolution: 0.1

• Measurement range: -328° to 1922°F (-200° to

1050°C) using a J-type thermocouple; -328° to 2498°F

(-200° to 1370°C) using a K-type thermocouple

• Measurement accuracy: ±(0.05% of reading + 1.4°F)

• upplied Probe(s) Range: 50º to 500ºF (-45º to 260ºC)

• Operating temperature range: 40° to 104°F

(5° to 40°C), below 80% R

• torage temperature range: 14° to 140°F

(-10° to 60°C), below 70% R

REL

TYPE O

MAX

MIN

T1-T2

T1➝T2

➝

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