User Manual Professional Thermocouple Thermometer with Dual Type K Inputs and Optional Infrared Wand with NIST-Traceable Calibration Model 20250-17 Enter REC DIF THE STANDARD IN PRECISION MEASUREMENT
Introduction The Digi-Sense Professional Thermocouple Thermometer (Model 20250-17) with Dual Type K Inputs and Optional Infrared Wand offers fast response and high accuracy. This heavy-duty meter works with two type K thermocouples and one optional infrared probe*. Advanced features include backlight, Max/Min/Avg readings, data Hold, 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.
1 2 Meter Description 1. Thermocouple type K (T1) input 2. Thermocouple type K (T2) input 3. LCD 13 3 4. Enter button 5. Up button 6. Down button 8 7. Power on/off button 8. Setup / Backlight button REC 11. HOLD button 6 9 9. °C/°F/K button 10. MAX/MIN button 4 Enter 10 5 11 DIF 12. DIF/T1–T2–T3 button 12 13. IR (T3) input* 7 * Optional infrared wand (model 20250-24) must be ordered separately. Display Layout 1. Thermocouple TYPE K icon 1 2.
Setup and Operation 1. Press the Power on/off button to turn unit on. Using Thermocouple Input(s) 1. Plug the type K thermocouples into the T1 and T2 input connectors. 2. After one second the thermometer displays the first readings (T1 on upper display, T2 on secondary display). If no thermocouple is plugged into the selected input or the thermocouple is not properly connected, the display will show "- - - -".
Hold Function 1. Press HOLD button to freeze the readings on the display. The screen shows the HOLD icon. 2. Use the DIF/T1–T2–T3 button to toggle between showing the T1 (type K), T2 (type K), T3 (infrared), and T1–T2, T1–T3, T2–T3 (temperature differentials) measurement in the primary, secondary, or tertiary display. 3. Press HOLD button again to turn off the HOLD function and resume measuring. MAX, MIN, and AVG Function 1.
Setup Options Use the Setup mode to change the temperature offset and sleep mode settings. Note: Setup mode is disabled in Max, Min, and Avg modes. Changing a Setup Option 1. Press and hold Setup/Backlight button for three seconds to enter or exit Setup mode. When the meter is in Setup mode, the display shows the SETUP icon. 2. Press Up or Down button to scroll to the setup option you want to change. 3. Press ENTER button to indicate that you want to change this setting. 4.
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 (T/C) ±[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 (T/C) ±[0.5% reading + 1.8°F (1°C)] T3 (IR) ±[2.0% reading + 3.6°F (2°C)] T1 (T/C) – T3 (IR) ±[2.0% reading + 5.4°F (3°C)] T2 (T/C) – T3 (IR) ±[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 on page 7. 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.