Digi-Sense 20250-01 Manuel utilisateur

User Manual

THE STANDARD IN PRECISION MEASUREMENT

Thermocouple Thermometer

with Single Type K/J Input

with NIST-Traceable Calibration

Model 20250-01

Introduction

The Digi-Sense Thermocouple Thermometer with Single

Type K/J Input (Model 20250-01) offers fast response and

high accuracy. This thermometer works with one type K or

J thermocouple sensor. Advanced features include relative

time clock, offset compensation, data Hold, Max/Min/Avg

readings, and automatic power-off. The instrument is fully

tested and calibrated to NIST-traceable standards. Careful

use of this meter will provide years of reliable service.

Unpacking

Check individual parts against the list of items below. If

anything is missing or damaged, please contact your

instrument supplier immediately.

1. Meter

2. One ﬂexible type K thermocouple probe

3. Three AAA batteries

4. User manual

5. NIST-traceable calibration report with data

Key Features

• Large backlit display

• Max, Min, and Avg readings

• Relative time clock on Max/Min/Avg provides a time

reference for major events

• Electronic Offset function allows compensation of

thermocouple errors to maximize overall accuracy

• User-selectable readout in °C, °F, or Kelvin (K)

• Automatic power-off (sleep) mode to conserve battery life

• Accepts a wide variety of thermocouple type K and J

probes

Meter Description

1. Temperature sensor input

2. LCD

3. Power on/off button

4. Enter button

5. Set button

6. °C/°F/K button

7.  (Up)/Hold button

8. Max/Min/(Down) button

Backlight button

Display Layout

1. Setup mode icon

2. Offset option

3. Hold icon

4. Auto power-off icon

5. Primary temperature

display

6. User-selectable

temperature units

(°C/°F/K)

7. Secondary display

(Max, Min, Avg, or

offset)

8. MAX, MIN, AVG icons

9. Time display

10. Time icon (hour:min

or min:sec)

11. Thermocouple type

icon (K or J)

12. Low-battery indicator

3 4

Setup and Operation

1. Press Power on/off button to turn the unit on.

2. When thermometer is in Setup mode, press Enter

button to enter a setup option and press Enter

button again to store the displayed setting in

memory.

3. Press Set button to enter or exit Setup mode.

(See "Changing Setup Options" on page 7.)

4. Press °C/°F/°K button to switch between Celsius

(°C), Fahrenheit (°F), and Kelvin (K).

5. Press /Hold button to freeze or unfreeze the

displayed readings. When the thermometer is in

Setup mode, press /Hold button to scroll to the

Setup option you want to change or press /Hold

button to increase the displayed setting.

6. Press Max/Min/button to step through the

maximum, minimum, and average of the logged

readings. When reading, the screen will indicate

the MAX, MIN, or AVG icon. To exit the Max/Min/

Avg mode, press and hold Max/Min/button for

three seconds to return to normal operation. When

the thermometer is in Setup mode, press

Max/Min/button to scroll to the Setup option

you want to change or press Max/Min/button

to decrease the displayed setting.

7. Press Backlight button to the backlight on or off.

Setup Mode

Use Setup mode to change offset and sleep mode settings.

The thermometer stores the settings in its memory.

Option Menu item Settings

Type TYPE K or J

Offset OFFSET Offset range –9 to 9°F (–5 to 5°C)

Sleep mode SLP On (sleep mode on)

Off (sleep mode off)

Entering or Exiting Setup Mode

When the thermometer is in Setup mode, the display

shows the SETUP icon. Press Set button to enter or exit

the Setup mode.

Changing Setup Options

1. Press /Hold button or Max/Min/button to scroll to

the setup option you want to change.

2. Press Enter button to indicate that you want to change

this setting.

3. Press /Hold button or Max/Min/button until the

setting you want to use appears on the display.

4. Press Enter button to store the new setting in memory.

Note: Setup is disabled in MAX/MIN mode.

Setup Mode (continued)

Offset Function

The primary display shows the

temperature plus the offset and

the secondary display shows

the offset.

1. When the thermometer is in

Setup mode, the display

shows the SETUP icon.

2. Press /Hold button or

Max/Min/button to scroll

to the OFFSET setup option

page (see Fig. 1).

3. Press Enter button to indicate

the offset in the secondary display.

4. Press /Hold button or Max/Min/button until the

value you want to use appears on the display.

5. Press Enter button to store the new setting

into memory.

Using the Offset to Adjust for Probe Errors

Use the offset option in the Setup mode to adjust the

thermometer’s readings to compensate for the errors of

a speciﬁc thermocouple. The allowable adjustment

range is ±9.0°F or ±5.0°C.

1. Plug the thermocouple into the input connector.

2. Place the thermocouple in a known, stable temperature

environment (such as an ice bath).

Fig. 1

Fig. 2

3. Allow the readings to stabilize.

4. In the Setup mode change the offset until the primary

reading matches the calibration temperature. (See

“Changing Setup Options" on page 7.)

Auto Power-Off (APO) Mode

The meter’s default mode is to automatically shut off

after 20 minutes of non-use. To disable the auto power-

off mode, enter the Setup mode.

1. While in Setup mode, press

/Hold button or Max/Min/

button to scroll to the “SLP” option

screen (see Fig. 2).

2. Press ENTER button to display “On.”

3. Use the /Hold button or

Max/Min/button to toggle

between “On” (sleep mode on)

or “Off” (sleep mode off).

Note: Mode defaults back to “On”

once meter is powered off.

Measuring Temperatures

1. Plug the thermocouple into the T1 input connector.

Make sure that the polarity is correct.

2. Press power on/off button to turn on the thermometer.

After one second the thermometer displays the ﬁrst

reading. If no thermocouple is plugged into the

selected input or the thermocouple is not connected

properly, the display shows "- - - -". If the temperature

being measured is outside the thermocouple’s valid

range, the display shows “OL” (overload).

3. Set the thermometer for the correct thermocouple

type (K or J) in Setup menu.

4. Press °C/°F/K button to select the desired

temperature scale.

Hold Function

1. Press /Hold button to freeze the readings on the

display. The display shows the HOLD icon.

2. Press /Hold button again to turn off the Hold

function.

Min/Max/Avg Function

1. Press Max/Min/button to step through the

maximum (MAX), minimum (MIN), and average

(AVG) readings. The elapsed time since entering

Max/Min mode, or the time at which the maximum

or minimum reading occurred, appears on the

display.

2. Press and hold Max/Min/button for 3 seconds

to exit Max/Min mode.

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