User Manual Professional Thermocouple Thermometer with Dual Type K Inputs, Data Logging, and Optional Infrared Wand with NIST-Traceable Calibration Model 20250-19 Enter REC DIF THE STANDARD IN PRECISION MEASUREMENT
Introduction The Digi-Sense Professional Thermocouple Thermometer (Model 20250-19) with Dual Type K Inputs, Data Logging, and Optional Infrared Wand offers fast response and high accuracy. This heavy-duty meter works with up to two type K thermocouples and one optional infrared probe*. Advanced features include data logging, USB interface, relative time clock, offset compensation, temperature differential, data Hold, Max/Min/Avg readings, and automatic power-off.
Meter Description 1 1. Thermocouple type K (T1) input 2 2. Thermocouple type K (T2) input 3. LCD 4. Enter button 5. Up button 13 3 6. Rec/ button 7. °C/°F/K button 8. HOLD button 9. Power on/off button 12 4 Enter REC 10. DIF/T1–T2–T3 button 6 11. MAX/MIN button 12. Setup / Backlight button 7 11 8 13. IR (T3) input* * Optional infrared wand (model 20250-24) must be ordered separately. 5 DIF 10 9 Display Layout 1. Thermocouple TYPE K icon (this icon flashes when meter is recording) 2.
Setup and Operation 1. Press Power on/off button to turn the unit on. The value immediately shown is the number of data logging sample points remaining (from 18,000 to 0). After one second, the display will then switch to the temperature measurement reading mode. 2. Press MAX/MIN button to step through the maximum, minimum, and average readings. To exit the Max/Min/Avg mode, press MAX/MIN button for three seconds to return to normal operation. 3.
Changing Setup Options Use the Setup mode to change offset, sample rate, time, clear data logging memory, and sleep mode settings. The thermometer stores the settings in its memory.
Sample Rate Function The tertiary display shows the sample rate of the temperature data recording. When the meter is powered on, the default sample rate is 1 second. The tertiary display shows “00 01” in minutes, then seconds (Fig. 2). 1. Press °C/°F/K button until the value you wish to change is flashing. 2. Press or Rec/ button until the setting you want to use appears on the display. 3. Press Enter button to store the new setting into memory. Time Setting Function Fig. 2 1.
3. Press Enter button and “SURE No” will appear on the screen. 4. Press the or Rec/ button until the display shows “SURE YES”, indicating the memory will be cleared. 5. Press Enter button to select the “SURE YES” setting and clear the memory. Data logging capacity now returns to 18,000 sample points. Auto Power-Off (APO)/Sleep 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.
Recording/Data Logging Operation (Meter) 1. Press Power on/off button to turn the unit on. The first value immediately shown is the number of data logging sample points remaining (Fig. 5). 2. Press Rec/ button to begin recording; the TYPE K icon will be flashing to indicate the meter is recording data measurements. 3. To stop recording, press and hold Rec/ button for three seconds until the TYPE K icon is no longer flashing. 4. Note: A maximum of 18,000 sample points is available (Fig. 5).
7. To download the data to your PC, select RealTime(R) in the menu bar and click run. The software screen will display the data being downloaded from the meter. Upon completion of downloading the data to the PC, the data results will be displayed graphically. 8. To save the measurement data to your PC, select the “Data List” tab to open the list of measurements recorded. Select “File” icon from the menu bar and save data to desired location on your PC.
Specifications Range Temperature, external type K thermocouple –328 to 2501°F (–200 to 1372°C) Resolution Temperature display 0.1 (<1000) or 1 (≥1000) Accuracy T1, T2 ±[0.15% reading + 1.8°F (1°C)] above –148°F (–100°C) ±[0.5% reading + 3.6°F (2°C)] below –148°F (–100°C) T1–T2 ±[0.5% reading + 1.8°F (1°C)] T3 (IR temperature) ±[2.0% reading + 3.6°F (2°C)] above 14°F (–10°C) ±9°F (5°C) below 14°F (–10°C) T1–T3, T2–T3 ±[2.0% reading + 5.
Maintenance, Recalibration, and Repair Cleaning and storage • The meter should be cleaned with a damp cloth and mild detergent when necessary. Do not use solvents or abrasives. • Store the meter in an area within the storage range indicated in the Specifications chart earlier in this manual. Battery Replacement When the battery power falls low, the low-battery icon will appear on the screen. Replace the 9 V battery in the rear battery compartment by removing the cover.
For Product and Ordering Information, Contact: Toll-Free: 1-800-323-4340 Phone: 1-847-549-7600 Fax: 1-847-247-2929 ColeParmer.com/Digi-Sense 1065DGMAN_20250-19 Rev.1 Toll-Free: 1-800-358-5525 Phone: 1-847-327-2000 Fax: 1-847-327-2700 Davis.com/Digi-Sense Manual Part No.