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Summary of Contents for Digi-Sense 20250-12
- Page 1 User Manual Thermohygrometer with Single Type K Input and Superheat Function with NIST-Traceable Calibration Model 20250-12 THE STANDARD IN PRECISION MEASUREMENT...
- Page 2 Introduction The Digi-Sense Thermohygrometer (Model 20250-12) with Single Type K Input and Superheat Function offers fast response and high accuracy. This meter is both a dig- ital thermohygrometer and a valuable HVAC diagnostic tool—it measures humidity, dew point, wet bulb, dry bulb, temperature, plus target superheat (TSH) and target evaporator exit temperature (TEET).
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Page 3: Meter Description
Meter Description 1. Thermocouple type K input 2. Thermistor temperature sensor (internal) 3. MODE button 4. ENTER button 5. OUTPUT button 6. °C/°F / Backlight button 7. SENSOR button 8. MAX/MIN/HOLD button 9. Power On/Off button 10. LCD 11. Humidity sensor (internal) 12. -
Page 4: Display Functions
Display Functions 1. Low-battery indication 2. Measurement icons (RH, DP, WB, DB) 3. °C/°F icons for upper display 4. Indoor (ID) / Outdoor (OD) icons 5. Upper measurement display of humidity, dew point, wet bulb, dry bulb, temperature 6. MIN / MAX icons 7. -
Page 5: Setup And Operation
Setup and Operation Power Press the Power on/off button to turn unit on. Taking Measurements 1. Hold the sensor in the area to be tested. 2. Allow adequate time for readings to stabilize. 3. Press the MODE button until the NORM icon is displayed on the screen. - Page 6 Setup and Operation (continued) Automatic Power-Off To conserve battery life, the meter automatically turns off after 15 minutes. To disable this feature: 1. Turn the meter off. 2. Press and hold the MAX/MIN/HOLD button while powering on. 3. The “APO” will no longer been shown on the display, indicating that the Auto power-off feature is disabled.
- Page 7 Setup and Operation (continued) 2. While the numbers are blinking (unlocked mode), press and hold the SENSOR button until the NTC icon is displayed. Press SENSOR button again to select either the WB or DB icon. a. When the WB icon is displayed, place the internal sensor cap in front of the indoor air return and press the ENTER button when the reading is stable.
- Page 8 Setup and Operation (continued) Using Target Evaporator Exit Temperature (TEET) 1. Two thermocouple probes are required for a TEET measurement. 2. Press the MODE button until the TEET icon is displayed on the screen. a. Blinking numbers indicate that you are in the unlocked mode and seeing real-time measurements.
- Page 9 Setup and Operation (continued) 8. Press the SENSOR button until the DB icon is displayed. Press and hold the SENSOR button until the T/C icon is displayed. When reading is stable, press the ENTER button to lock the reading. 9. Press OUTPUT button and read the Target Evapora- tor Exit Temperature (TEET) in the lower display.
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Page 10: Specifications
Specifications Range Humidity 0 to 100% RH Temperature, external –328 to 2501°F (–200 to 1372°C) type K thermocouple (T/C) Temperature, internal 32 to 140°F (0 to 60°C) thermistor sensor (NTC) Dew point (calculated) –22 to 212°F (–30 to 100°C) Wet bulb (calculated) 32 to 176°F (0 to 80°C) Resolution Humidity... -
Page 11: Maintenance
Specifications (continued) Auto power-off Unit shuts off automatically after 15 minutes to preserve battery life Operating temperature 32 to 122°F (0 to 50°C) Storage temperature 14 to 122°F (–10 to 50°C) Weight 6 oz (173 g) Dimensions ⁄ " x 2 ⁄... - Page 12 Maintenance, Recalibration, and Repair It is recommended that Digi-Sense products are calibrated annually to ensure proper function and accurate measure- ments; however, your quality system or regulatory body may require more frequent calibrations. To schedule your recalibration, please contact InnoCal, an ISO 17025 calibra- tion laboratory accredited by A2LA.
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