INTRODUCTION Congratulations on your purchase of the Hygro-Thermometer ! This unique instrument is portable, battery operated in Temperature./Relative Humidity/Dew Point / Wet Bulb temperature in a compact measuring device. There are 3 models available for selection. The Hygrometer is ideal for HVAC/R technicians measuring Temperature , Humidity, Though you might have seen Dew Point or Wet Bulb .. these are not available for model 8701, and Wet bulb function is only available for model 8705.
CONTROLS AND INDICATORS HLD % MIN MAX td WB C F 1. Primary Data Screen displays pressure value. 2. "-" .Minus pressure display. 3. MAX Maximum recorded. 4. MIN Minimum recorded. 5. HLD Hold current reading. 6. td Dew Point measurement. 7. WB Wet Bulb temperature measurement . 8. C Celsuis unit 9. F Farenheit unit 10. % Relative humidity unit 8701 without td/WBT key 8703 td/WBT key without printing WBT.
AUTO POWER OFF (SLEEP FUNCTION) Unit will turn itself off after 20 minutes (Sleep mode) To override Auto Power Off function (Non-Sleep Mode) press ON/OFF and MIN/MAX button simultaneously. After the full display appears release ON/OFF button first,the display will show " n " in left side. When " n " appears (See Fig.A) then release MIN/ MAX button. Unit will now be in NonSleep Mode. Fig. A MODE OPTIONS (1) Remove protective sensor cover. (2) Turn meter on by pressing ON/OFF button.(See Fig.
DATA HOLE FUNCTION Press "HOLD" button until (HLD) appears in display. The current reading is now being held and will not change until Hold function is cancelled. (See Fig.D) Press "RST" button to cancel Hold function. Hold function can be used for temperature, Humidity, Dew-point & Wet bulb. HLD % Fig. D C DEW POINT FUNCTION Press and hold (td/WBT) button until "td" appears on left side of display. Unit will now display Dew Point Temp. See Fig.E % Fig.
MIN./MAX. FUNCTION (1) Press and hold MN/MX button until (MIN) appears on display.(See Fig.G) Display is now showing minimum humidity and temperature reading in memory. (2) Press and hold MN/MX button again until (MAX) appears on display. (See Fig.H) Display is now showing maximum humidity and temperature readings in memory. (3) To return to current temperature and humidity readings press and hold MN/MX button until Min or Max disappear from display.
Caution: Please do not immerse probe into liquids as this will cause permanent damage to the sensor. MAINTENANCE The meter is calibrated in house before shipping. To maintain the meter in the good condition for use , recommend to calibrate the meter after long time using. Cleaning: Use a damp cloth and mild soap to clean the case of the meter, do not use harsh detergents or abrasives as these may mar the finish or damage the unit's case with an adverse chemical reaction.
See Fig.H ,please leave the meter in the bottle for at least 40 minutes and the meter will start the calibration process. When the calibration for 33% is done ,you will see a MIN and MAX display on the LCD screen. Press C/F button to save the calibration of 33% . The LCD shows "s" in 2 seconds (See Fig.K) and then resume normal measurement. Turn off the meter, the calibration of 33% is completed . % MIN Fig.
Automatic Calibration : Turn off the meter , then plug the meter probe into the 33% salt bottle and then power on the meter by pressing " ON /OFF button and the C/F button at the same time. When LCD screen shows a full display, release the ON/OFF key. You will see the display of C and F at the lower right corner of LCD screen , then release the C/F button. The LCD will display only the default setting of temperature unit C or F. Press "RST" key and you will see a "% MIN" display on the right upper corner.
TROUBLESHOOTING ? Power on but no display. Check the battery are in place and making good contact or correct polarity , replace a new battery or attach optional AC adaptor for the weak battery caused. ? No Display. Make sure battery is not empty , if the display disappear , check sleep mode is active. Refer to the Disable sleep mode function for a long time using the measurement. ? Screen flashing. Battery low , the batteries need to be replaced. ? Er 1, Er 3 ,E r 4 .
SPECIFICATION Temperature range: Model: 8701 (grey color body) -10~+50oC (+14~+122oF) Model: 8703 / 8705 (black color body) -20~+50 oC ( - 4~+122 oF ) Accuracy : Relative Humidity : Model: 8701 5~95%RH 4%25 oC Model: 8703/8705 o 0~100%RH 3%25 C Temperature : o 1 C Pocket size : 16.5mm(H) x 48.52mm(W) x 170mm(L) Response time : Model: 8701 ,80 seconds typical Model: 8703/8705,60 seconds typical Battery life : Typical 500 hrs. Package : Gift box, Battery, Manual. Weight : 75g(Approx.) Power : 2 x 1.