CALIBRATABLE 3-FUNCTION THERMOHYGROMETER USER’S MANUAL EP8703 Please read this manual carefully and thoroughly before using this product.
TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . . 2 – 3 Key Features . . . . . . . . . . . . . . . . . . . . 4 What’s in the Box . . . . . . . . . . . . . . . . 4 Product Overview . . . . . . . . . . . . . 4 – 6 Setup Instructions . . . . . . . . . . . . 6 – 7 Install Battery . . . . . . . . . . . . . . 6 – 7 Operating Instructions . . . . . . . . . 7 – 8 Making Basic Measurements . . 7 – 8 Calibrating the Meter . . . . . . . . . 8 – 10 Specifications . . . . . . . . . . . . . . . . . .
• Water damage restoration contractors • HVAC/R system installers and technicians • 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.
KEY FEATURES • Jumbo backlit display with 2-line readout • Field calibratable using optional 33% and 75% salts • °F/°C switch • 20-minute Auto Power Off function • Low battery indicator WHAT’S IN THE BOX The EP8703 comes fully assembled in a box along with a sensor 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 EP8703.
A B F C D E Fig. 1. The EP8703’s controls, indicators and physical structures A. Humidity and temperature sensors B. LCD C. (Power on/off) button D. F/C button E. Battery compartment F.
A F E B D C Fig. 2. All possible display indications and their meanings A. Low battery icon B. °C indicator C. °F indicator D. Temperature readout E. Dew point temperature indicator F. Relative humidity (RH) readout SETUP INSTRUCTIONS INSTALL BATTERY 1. The meter’s battery compartment (Fig. 1, Callout E) 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.
2. Plug the included “9V” battery 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.
By default, the EP8703 displays ambient and dew point temperatures in °F. To switch to °C, press the F/C button. Pressing any button turns on the green backlight for 10 seconds. To extend the life of the “9V” battery powering the EP8703, 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.
hours in a dusty environment. To calibrate the EP8703, 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 HR33 and HR75. 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.
leaking into the bottle. 4. Leave the unit upside-down in the 33% salt bottle for at least 40 minutes. The calibration to 33% is fully automatic and requires no interaction or checking by you. 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.
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: <80 seconds Display Size: 1.7 in. (43mm) diagonal Current Consumption: <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.
OPERATING & MAINTENANCE TIPS When the 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 pages 6 and 7.
WARRANTY INFORMATION General Tools & Instruments’ (General’s) EP8703 Calibratable 3-Function ThermoHygrometer 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.
RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality.
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GENERAL TOOLS & 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 EP8703 User’s Manual Specifications subject to change without notice ©2015 GENERAL TOOLS & INSTRUMENTS NOTICE - WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS.
