EP8709 - General Tools And Instruments
Contents
1. disable the APO function power on the unit in a special way by pressing and holding the DEW button while pressing the 5 button Following is the calibration procedure 1 With the unit powered on and the APO function disabled rotate the sensor protection cap to open its three vents and expose the humidity sensor to the environment Press and hold the DEW and F C buttons at the same time and then release them This will cause _ _ _ 1 to appear on the lower readout 3 Turn the unit upside down and insert the sensor structure in the opening of the 33 salt bottle after removing the bottle s cap The fit should be tight with no air leaking into the bottle 4 Leave the unit upside down in the 3396 salt bottle for at least 40 minutes The calibration to 33 is fully automatic and requires no interaction or checking by you N 11 5 Remove the meter from the 33 salt bottle and again press hold and release the DEW and F C buttons at the same time Doing so this time will cause 2 to appear on the lower readout 6 Turn the unit upside down and insert the sensor structure in the opening of the 75 salt bottle after removing the bottle s cap The fit should be tight with no air leaking into the bottle Leave the meter upside down in the 75 salt bottle for at least 40 minutes The calibration to 75 is fully automatic and requires no interaction or checking by you The unit is calibrated when two cyc2. CALIBRATABLE 4 FUNCTION THERMO HYGROMETER USER S MANUAL EP8709 Please read this manual carefully and thoroughly before using this product TABLE OF CONTENTS Introduction 2 4 Key Features 0 0eeeaee 4 What s in the Box 5 4 Product Overview 4 6 Setup Instructions 7 Install Battery Lue 7 Operating Instructions 7 10 Making Basic Measurements 7 9 Tracking Min and Max Levels 9 10 Calibrating the Meter 10 12 Specifications 13 Operating amp Maintenance Tips 14 Warranty Information 15 Return for Repair Policy 16 INTRODUCTION Thank you for purchasing General Tools amp Instruments EP8709 Calibratable 4 Function Thermo Hygrometer Please read this user s manual carefully and thoroughly before using the instrument The EP8709 can measure any environment s ambient temperature relative humidity RH and dew point and wet bulb temperatures These measurements are typically made by three groups of users 2 e Water damage restoration contractors e HVAC R system installers and technicians e Professionals charged with monitoring and maintaining the environment of facilities such as office buildings greenhouses food and equipment storage facilities wineries freezers shipping containers computer rooms labs libraries museums and saunas
3. The dew point is the temperature below which the water vapor in a volume of air at a given constant barometric pressure will condense into liquid water at the same rate at which it evaporates Condensed water is called dew when it forms on a solid surface Another way to think of the dew point is as an air saturation temperature associated with relative humidity RH A high RH value indicates that the dew point is close to the current ambient air temperature At 10096 RH the dew point temperature is equal to the ambient temperature because the air is completely saturated with water The wet bulb temperature is the temperature that a volume of air would have if it were cooled to saturation 100 RH by the evaporation of water into it with the latent heat coming from the volume of air It is the lowest temperature that can be reached under current ambient conditions by the evaporation of water only The wet bulb temperature is the temperature you feel when your skin is wet and exposed to moving air as opposed to the actual air temperature the dry bulb temperature The EP8709 is powered by one 9V battery included KEY FEATURES e Jumbo backlit display with 2 line readout Field calibratable using optional 33 and 75 salts e Data hold and Min Max functions e F C switch e 20 minute Auto Power Off function e Low battery indicator WHAT S IN THE BOX The EP8709 comes fully assembled in a box along with a sens
4. ar at the right of the RH readout To unfreeze the display and resume showing real time readings press the HOLD button again This will cause HOLD to disappear from the RH readout Pressing any button turns on the green backlight for 10 seconds To extend the life of the 9V battery powering the EP8709 the unit s Auto Power 8 Off APO function will automatically shut down the instrument if no front panel buttons are pressed within any 20 minute period To disable the APO function power on the unit in a special way by pressing and holding the DEW button while pressing the 5 button The LCD will confirm that you are disabling the APO function by displaying its complete set of icons see Fig 2 until you release the DEW button The APO function will be enabled the next time you power on the unit in the normal way To power off the EP8709 press and hold the 5 button for at least 3 seconds TRACKING MIN AND MAX LEVELS After being powered on the EP8709 automatically operates in Recording mode for the purpose of tracking maximum and minimum RH and ambient temperature values over the duration of a measurement session To display the maximum RH and ambient temperature values measured during the current measurement session press the MAX MIN button once The text MAX will appear at the right of the RH readout and both readouts will indicate the highest values of RH and ambient temperature measured since 1 the m
5. attery into the wired socket inside the compartment The terminals of the battery and the socket mate in only one way with the smaller male terminal plugging into the larger female terminal 3 Replace the battery compartment cover and tighten the screw to secure it to the housing OPERATING INSTRUCTIONS MAKING BASIC MEASUREMENTS Before making any measurements rotate the sensor protection cap with your thumb and index finger so its three vents are open to the ambient environment from both the front and back Press the 5 button to power on the meter The dual displays will immediately begin reading out humidity and ambient temperature measurements made by the sensors at the top of the unit To display the dew point temperature instead of ambient temperature on the lower readout press the DEW button The reading will be accompanied by the symbol DEW at its left To return to displaying ambient temperature press the DEW button again To display the wet bulb temperature instead of ambient temperature on the lower readout press the WBT button The reading will be accompanied by the symbol WBT at its left To return to displaying ambient temperature press the WBT button again By default the EP8709 displays ambient dew point and wet bulb temperatures in F To switch to C press the F C button To hold a pair of readings RH ambient dew point wet bulb temperature press the HOLD button The text HOLD will appe
6. eter was last powered on or 2 the Min Max memory was reset by entering and exiting Min Max mode 9 To display the minimum RH and ambient temperature values measured since the meter was powered on press the MAX MIN button again The text MIN will replace MAX at the right of the RH readout and both readouts will indicate the lowest values of RH and ambient temperature measured during the current session To return to displaying real time RH and ambient temperature readings press the MAX MIN button a third time The text MIN will disappear from the RH readout Exiting Min Max mode clears the Min Max memory and begins a new measurement session CALIBRATING THE METER Your EP8709 was calibrated at the factory so its measurements should remain within their specified tolerance for several years However you can re calibrate the unit yourself to reassure yourself of the accuracy of readings especially after the instrument has been operated for many hours in a dusty environment To calibrate the EP8709 you must use two jars of standard calibration salt one containing a 33 solution of MgCl and the other a 75 solution of NaCl Both are available for purchase from General as part numbers SKUs HR33 and HR75 10 Before beginning the calibration procedure which is a turnkey process but takes at least 80 minutes to complete you must disable the APO function so the instrument can remain on for more than 20 minutes To
7. les one at 33 and the other at 75 have been completed It is important that the 33 calibration precede the 75 calibration Reversing the order or performing either calibration twice will produce an error message when the unit is restarted N co SPECIFICATIONS Temperature Measurement Range 14 to 122 F 10 to 50 C Temperature Measurement Accuracy 1 8 F 1 C Temperature Measurement Resolution 0 1 RH Measurement Range 0 to 99 9 RH Measurement Accuracy 3 from 5 to 95 RH RH Measurement Resolution 0 1 Response Time lt 80 seconds Display Size 1 7 in 43mm diagonal Current Consumption lt 15mA Battery Life 60 hours typical Dimensions of Instrument 7 56 X 2 40 x 1 57 in 192 x 61 x 40mm Dimensions of Box 7 76 X 3 66 x 1 58 in 197 x 93 x 40mm Weight without battery 3 77 oz 107g Power Source 1 9V battery included 13 OPERATING amp MAINTENANCE TIPS When the dT icon appears at the upper right of the display Fig 2 Callout A it s time to replace the 9V battery that powers the instrument although measurements will remain valid for several hours after the icon first appears To replace the battery follow the instructions on page 7 To prevent dust and moisture from degrading the performance of the humidity and temperature sensors after each measurement session rotate the sensor protection cap to close its three vents Do not operate
8. ny cost attorneys fees expenses or losses alleged to be a consequence of damage due to failure of or defect in any product including but not limited to any claims for loss of profits RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality However in the event your instrument requires repair please contact our Customer Service to obtain an RGA Return Goods Authorization number before forwarding the unit via prepaid freight to the attention of our Service Center at this address General Tools amp Instruments 75 Seaview Drive e Secaucus NJ 07094 212 431 6100 Remember to include a copy of your proof of purchase your return address and your phone number and or e mail address Specialty Tools amp Instruments GENERAL TOOLS amp INSTRUMENTS 75 Seaview Drive Secaucus NJ 07094 1806 PHONE 212 431 6100 FAX 212 431 6499 TOLL FREE 800 697 8665 e mail sales generaltools com www generaltools com EP8709 User s Manual Specifications subject to change without notice 2015 GENERAL TOOLS amp INSTRUMENTS NOTICE WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN EP8709 07 15 15 J You General Tools amp Instruments Tube GeneralToolsNYC
9. or protection cap a 9V battery and this user s manual PRODUCT OVERVIEW Figure 1 shows all of the controls indicators and physical structures on the front top and bottom of the EP8709 Figure 2 shows all text and icons that could appear on the unit s LCD Familiarize yourself with the positions and functions of all buttons structures and icons before moving on to the Setup Instructions and Operating Instructions 4 m dac l Fig 1 The EP8709 s controls indicators and physical structures A Humidity and temperature sensors B LCD C 5 Power on off button D F C button E WBT wet bulb temperature button F DEW button G HOLD button H MAX MIN button Battery compartment B Ba BB gt WT IU LP Lb Vr Fig 2 All possible display indications and their meanings A Low battery icon B Data hold indicator C Maximum reading indicator D Minimum reading indicator E C indicator F F indicator G Wet bulb temperature indicator H Dew point temperature indicator Temperature readout J Relative humidity RH readout SETUP INSTRUCTIONS INSTALL BATTERY 1 The meter s battery compartment Fig 1 Callout I is accessible from the bottom of the unit Use a Phillips head screwdriver to loosen the single screw in the back of the unit that holds the yellow battery compartment cover in place Set the cover and screw aside 2 Plug the included 9V b
10. the EP8709 in the presence of a flammable or explosive gas or near an arc welder or induction heater After subjecting the unit to a large change in ambient temperature wait at least 30 minutes before making measurements to guarantee the accuracy of readings Remove the battery when storing the unit or when you do not expect to use it for an extended period of time months rather than weeks Do not drop or disassemble the EP8709 or immerse it in water WARRANTY INFORMATION General Tools amp Instruments General s EP8709 Calibratable 4 Function Thermo Hygrometer is warranted to the original purchaser to be free from defects in material and workmanship for a period of one year Subject to certain restrictions General will repair or replace this instrument if after examination the company determines it to be defective in material or workmanship This warranty does not apply to damages that General determines to be from an attempted repair by non authorized personnel or misuse alterations normal wear and tear or accidental damage The defective unit must be returned to General Tools amp Instruments or to a General authorized service center freight prepaid and insured Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product In no event shall General be liable for any incidental special consequential or punitive damages or for a
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