User Manual Thermohygrometer with Single
Contents
1. tion laboratory accredited by A2LA INNOCAL INNOVATIVE CALIBRATION SOLUTIONS Phone 1 866 INNOCAL 1 866 466 6225 Fax 1 847 327 2993 E mail sales innocalsolutions com Web InnoCalSolutions com For Product and Ordering Information Contact Cole Davis lt Cole Parmer EUS Delivering Solutions You Trust Proven Precise Personal Toll Free 1 800 323 4340 Toll Free 1 800 358 5525 Phone 1 847 549 7600 Phone 1 847 327 2000 Fax 1 847 247 2929 Fax 1 847 327 2700 ColeParmer com Digi Sense Davis com Digi Sense 1065DGMAN_20250 12 Rev 1 Manual Part No 00100 502. tested Allow adequate time for readings to stabilize Press the MODE button until the NORM icon is displayed on the screen Press the SENSOR button and hold for two seconds to select the temperature sensor in use either T C for external thermocouple or NTC for internal thermistor While in the internal sensor NTC mode use the SENSOR button to toggle between other available mea surements humidity RH dew point DP wet bulb WB and dry bulb DB The icon displayed indicates the selected measurement Press the C F Backlight button to select either C or F temperature units Viewing the Min and Max Readings and Hold Function 1 2 Press MAX MIN HOLD button to step through the mini mum MIN maximum MAX and Hold readings Press MAX MIN HOLD button again to exit the MAX MIN HOLD mode LCD Backlight Press and hold the C F Backlight button for two seconds to turn backlight on or off 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 4 Note that Auto power off is re enabled each time the meter is turned on Using Target Superheat Mode TSH 1 Press the MODE button until the TSH icon is displayed
3. the Actual Evaporator Exit Temperature The Actual Evaporator Exit Temperature is the measured temperature of the air after it has passed through the evaporator Adjust airflow accordingly a An Actual Evaporator Exit Temperature below the Target Evaporator Exit Temperature indicates low airflow Increasing airflow can be accomplished by eliminating restrictions in the duct system increasing blower speed cleaning filters or opening registers b An Actual Evaporator Exit Temperature above the Evaporator Exit Temperature usually indicates low capacity Occasionally airflow is higher than expected Look for causes of low capacity such as refrigerant mischarge or a dirty condenser coil If the airflow is high correct it by lowering the fan speed ification Range Humidity 0 to 100 RH Temperature external type K thermocouple T C 328 to 2501 F 200 to 1372 C Temperature internal thermistor sensor NTC 32 to 140 F 0 to 60 C Dew point calculated 22 to 212 F 30 to 100 C Wet bulb calculated 32 to 176 F 0 to 80 C Resolution Humidity 0 1 RH Temperature external type K thermocouple T C 0 1 lt 1000 or 1 1000 Temperature internal thermistor sensor NTC Accuracy 0 1 Humidity 2 5 RH from 10 to 90 RH 5 RH from 0 to 10 RH and 90 to 100 RH Temperature external type K thermocouple T C 0 5 read
4. User Manual D DIGI SENSE Thermohygrometer with Single Type K Input and Superheat Function with NIST Traceable Calibration Model 20250 12 _ _ ___ e AH DP WA DB F ID oD MIN MAX jo ol H io SRI T C NTC HOLD M APO is CE THE STANDARD IN PRECISION MEASUREMENT 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 Meter also features Min Max Hold readings and automatic power off and accepts a wide variety of thermocouple probes The instrument is fully tested and calibrated to NIST traceable standards Careful use of this meter will provide years of reliable service Unpacking Carefully unpack the instrument and accessories from shipping package Check individual parts against the list of items below If anything is missing or damaged please contact Cole Parmer immediately 1 Meter 2 One type K flexible probe 3 Carrying pouch 4 Three AAA batteries 5 User manual 6 NIST traceable calibration report with data Meter Descri
5. ing 1 8 F 1 C above 148 F 100 C 0 5 reading 3 6 F 2 C below 148 F 100 C 10 Temperature internal thermistor sensor NTC 1 8 F 1 C 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 T x 2 x 1 18 5 x 6 3 x 2 6 cm Power Three AAA 1 5 V batteries Maintenance Cleaning and storage 1 The meter should be cleaned with a damp cloth and mild detergent when necessary Do not use solvents or abrasives 2 Store the meter in an area with moderate temperature and humidity refer to the operating and storage range 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 three AAA batteries by removing the screw holding the rear battery compartment cover to access the battery compartment Ensure that the compartment cover is securely fastened when finished 11 Mai Recalibrati Repai 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
6. nti o N DO oO A U N gt a Thermocouple type K input Thermistor temperature sensor internal MODE button ENTER button OUTPUT button C F X Backlight button SENSOR button MAX MIN HOLD button 9 Power On Off button 10 LCD 11 Humidity sensor internal 12 Battery cover 3 6 4 7 5 8 10 9 Display Functi ao BRWRN oN DD 13 Low battery indication Measurement icons RH DP WB DB C F icons for upper display Indoor ID Outdoor OD icons Upper measurement display of humidity dew point wet bulb dry bulb temperature MIN MAX icons Humidity measurement RH icon HOLD icon Thermocouple T C and Thermistor NTC icons 10 11 12 MODE select icons NORM TEET TSH Auto power off APO indication Lower measurement display of target superheat and target evaporator exit temperature C F icons for lower display 2 3 1 RH DP WB DBC F i D i 4 5 OD MIN MAX o lo lo SR 7 9 We NTC HOLD 8 NORM APO 11 10 TEET TSH 12 _ IH 13 i a l F Setup and Operation Power Press the Power on off button to turn unit on Taking Measurements 1 2 3 Hold the sensor in the area to be
7. on the screen a Blinking numbers indicate that you are in the unlocked mode and seeing real time measurements b Solid non blinking numbers indicate that the reading has been locked c Press the ENTER button to unlock and take a new reading and then press ENTER button again to relock the measurement Set Operati 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 b When the DB icon is displayed place the internal sensor cap in front of the condenser and press the ENTER button when the reading is stable 3 Press the OUTPUT button to display the Target Superheat temperature in the lower display 4 Compare the Target Superheat temperature to the Actual Superheat temperature Adjust refrigerant levels accordingly for a fixed restrictor system a If Actual Superheat is higher than Target Superheat add refrigerant b If Actual Superheat is lower than Target Superheat recover refrigerant Set Operati 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 y
8. ou are in the unlocked mode and seeing real time measurements b Solid non blinking numbers indicate that the reading has been locked c Press the ENTER button to unlock and take a new reading and then press ENTER button again to relock the measurement 3 Insert thermocouple A into a sock and wet the sock 4 Clip both thermocouples thermocouple A and thermocouple B in front of the evaporator 5 Plug thermocouple A into the top of the meter Note If OL is displayed then the measurements are out of range Retake the temperature measurements and ensure the temperature inputs are set correctly 6 Press the SENSOR button until the WB icon is dis played 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 7 Unplug the thermocouple A and plug in the thermocouple B Set Operati l 8 Press the SENSOR button until the DB icon is 10 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 Press OUTPUT button and read the Target Evapora tor Exit Temperature TEET in the lower display Note If OL is displayed then the measurements are out of range Retake the temperature measure ments and ensure the temperature inputs are set correctly Compare the Target Evaporator Exit Temperature to
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