calibratable 7-function psychrometer ep8710
Contents
1. 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 EP8710 the unit s Auto Power 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 HOLD button while pressing the C 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 HOLD button The APO function will be enabled the next time you power on the unit in the normal way 10 To power off the EP8710 press and hold the button for at least 3 seconds USING THE EXTERNAL TEMPERATURE PROBE The external temperature probe included with the EP8710 can measure the surface temperature of any solid object the internal temperature of an object if it can be penetrated or the temperature of a liquid or gas The probe plugs into a jack on the right side of the EP8710 With the probe plugged in e A third parameter AT s available by pressing the S47 button AT is the difference between ambient temperature T1 and the surface or internal temperature T2 of a solid or fluid touched or penetrated by the probe e Two2. F C button J External temperature probe plugged into jack on side of unit TER c 8084088 ATena a m K H G Fig 2 All possible display indications and their meanings A Low battery icon B Data hold indicator C Minimum reading indicator D Maximum reading indicator E C indicator F F indicator G Probe T2 wet bulb temperature readout H Wet bulb Wb temperature indicator qj Condensation temperature indicator available only with external probe plugged in An object s condensation temperature is the difference between its surface temperature and the dew point temperature Probe temperature T2 indicator available only with external probe plugged in K Ambient T1 dew point temperature readout L Dew point temperature indicator M AT indicator available only with external probe plugged in AT is the difference between ambient temperature T1 and the surface or internal temperature T2 of a solid or fluid touched or penetrated by the probe N Ambient T1 temperature indicator O Relative humidity RH readout SETUP INSTRUCTIONS INSTALL BATTERY Te The meter s battery compartment Fig 1 Callout F 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 battery in
3. additional parameters T2 and a solid object s condensation temperature are available by pressing the e button T2 is the surface or internal temperature of a solid or fluid touched or penetrated by the probe An object s condensation temperature is the difference between its surface temperature and the dew point temperature 11 TRACKING MIN AND MAX LEVELS After being powered on the EP8710 automatically operates in Recording mode for the purpose of tracking maximum and minimum RH and ambient temperature measurements To display the maximum RH and ambient temperature values measured since the meter was powered on press the MAX MIN button once The text MAX will appear at the right of the upper RH readout and the upper and lower left readouts will display the highest values of RH and ambient temperature measured since power on 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 upper RH readout and the upper and lower left readouts will display the lowest values of RH and ambient temperature measured since power on 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 CALIBRATING THE METER Your EP8710 was calibrated at the factory so its measurements should remai
4. the 5 button The EP8710 is now calibrated to the 75 reference standard SPECIFICATIONS Ambient Temperature Measurement Range 14 to 122 F 10 to 50 C Ambient Temperature Measurement Accuracy 1 8 F 1 C External Temperature Probe Measurement Range 14 to 158 F 10 to 70 C External Temperature Probe Measurement Accuracy 1 8 F 1 0 C External Probe Cord Length 48 in 1 22m 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 0z 107g Power Source 1 9V battery included 17 OPERATING amp MAINTENANCE TIPS When the dT icon appears on the top line 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 pages 8 and 9 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 th
5. CALIBRATABLE 7 FUNCTION PSYCHROMETER USER S MANUAL EP8710 EP8710 Please read this manual carefully and thoroughly before using this product TABLE OF CONTENTS Introduction 005 2 4 Key FeatureS 000ceeeeeees 4 What s in the Box 005 5 Product Overview 5 8 Setup Instructions 8 9 Install Battery 0 8 9 Operating Instructions 9 12 Making Basic Measurements 9 11 Using the External Temperature Probe 11 Tracking Min and Max Levels 12 Calibrating the Meter 13 16 Specifications 000005 17 Operating amp Maintenance Tips 18 Warranty Information 19 Return for Repair Policy 20 INTRODUCTION Thank you for purchasing General Tools amp Instruments EP8710 Calibratable 7 Function Psychrometer Please read this user s manual carefully and thoroughly before using the instrument The EP8710 can measure any environment s ambient temperature relative humidity RH dew point and wet bulb temperatures and other condensation related parameters 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 faci
6. al temperature if it can be penetrated or the temperature of a liquid or gas 2 a Solid object s condensation temperature the difference between its surface temperature and the dew point temperature The EP8710 is powered by one 9V battery included KEY FEATURES e Jumbo backlit display with 2 line readout e Field calibratable using optional 33 and 75 salts e Data hold and Min Max functions e External probe for measuring internal and surface temperatures of objects and fluids e F C switch e 20 minute Auto Power Off function e Low battery indicator 4 WHAT S IN THE BOX The EP8710 comes fully assembled in a box along with a sensor protection cap an external temperature probe 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 EP8710 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 Fig 1 The EP8710 s controls indicators and physical structures A Humidity and temperature sensors B LCD C Power on off button D HOLD button E Gat Ambient dew point temperature 6 button F Battery compartment G MAX MIN button H 424 Probe condensation wet bulb temperature button
7. er is operating within its RH specification Remove the meter from the 33 salt bottle and proceed to step 10 If the reading is not between 32 5 and 33 5 the unit is out of calibration at this reference point To adjust its calibration press the HOLD and F C buttons at the same time to enter calibration mode The lower left readout will switch from displaying ambient temperature to showing the following oe 1 If the reading is less than 32 5 press the F C button as many times as necessary to increase it to a value between 32 5 and 33 0 If the reading is greater than 33 5 press the HOLD button as many times as necessary to decrease it to a value between 33 0 and 33 5 14 ol a 7 8 9 10 11 12 13 Store the calibration adjustment you have just made by pressing the button Remove the unit from the 33 salt bottle and repeat Steps 2 through 7 to calibrate the unit to the 33 reference a second time When you press the HOLD and F C buttons to enter calibration mode this time the left readout will display the following 2 Two calibrations constitute a cycle Store the calibration adjustment you have just made by pressing the 5 button The EP8710 is now calibrated to the 33 reference standard Remove the unit from the 33 salt bottle Insert the EP8710 upside down in the opening of the 75 salt bottle after removing the bottle s cap The fit should be tigh
8. lities wineries freezers shipping containers computer rooms labs libraries museums and saunas 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 100 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 Because the EP8710 includes an external temperature probe the instrument can also measure and display two additional parameters of particular importance to HVAC R system installers and technicians 1 the surface temperature of a solid object the object s intern
9. n 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 EP8710 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 Before beginning the calibration procedure which takes at least 2 1 2 hours to complete you must disable the APO function so the instrument can remain on for more than 20 minutes To disable the APO function power on the unit in a special way by pressing and holding the HOLD button while pressing the 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 13 2 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 3 Leave the unit upside down in the 33 salt bottle for at least 40 minutes 4 Check the upper RH readout without turning the unit right side up or removing the sensor structure from the bottle If the reading is between 32 5 and 33 5 the met
10. punitive damages or for any 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 80 White Street e New York NY 10013 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 80 White Street New York NY 10013 3567 PHONE 212 431 6100 FAX 212 431 6499 TOLL FREE 800 697 8665 e mail sales generaltools com www generaltools com EP8710 User s Manual Specifications subject to change without notice 2013 GENERAL TOOLS amp INSTRUMENTS NOTICE WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN EP8710 5 3 13 20
11. ree vents Do not operate the EP8710 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 EP8710 or immerse it in water WARRANTY INFORMATION General Tools amp Instruments General s EP8710 Calibratable 7 Function Psychrometer 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
12. t with no air leaking into the bottle Leave the unit upside down in the 75 salt bottle for at least 40 minutes Check the upper RH readout without turning the unit right side up or removing the sensor structure from the bottle If the reading is between 74 5 and 75 5 the meter is operating within its RH specification Remove the EP8710 from the 75 salt bottle If the reading is not between 74 5 and 75 5 the unit is out of calibration at this reference point To adjust its 45 14 15 16 17 16 calibration press the HOLD and F C buttons at the same time to enter calibration mode The lower left readout will switch from displaying ambient temperature to showing the following oe 1 If the reading is less than 74 5 press the F C button as many times as necessary to increase it to a value between 74 5 and 75 0 If the reading is greater than 75 5 press the HOLD button as many times as necessary to decrease it to a value between 75 0 and 75 5 Store the calibration adjustment you have just made by pressing the 9 button Remove the unit from the 75 salt bottle and repeat Steps 10 through 15 to calibrate the unit to the 75 reference a second time When you press the HOLD and F C buttons to enter calibration mode this time the lower left readout will display the following 2 Two calibrations constitute a cycle Store the calibration adjustment you have just made by pressing
13. to 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 button to power on the meter The upper display will immediately begin reading out the RH value of the environment The lower left display will immediately begin reading out the ambient temperature indicated by the text T1 at its left The lower right display will immediately begin reading out the wet bulb temperature indicated by the text Wb at its left To display the dew point temperature instead of ambient temperature on the lower left readout press the 44 button The reading will be accompanied by the symbol DP at its left To return to displaying ambient temperature press the 4 button again By default the EP8710 displays ambient dew point wet bulb and objects and fluids surface and internal temperatures in C To switch to F press the F C button To hold the readings on all three displays press the HOLD button The text HOLD will appear at the right of the RH readout To unfreeze
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