General EP8703 User manual

CALIBRATABLE

3-FUNCTION

THERMO-

HYGROMETER

USER’S MANUAL

EP8703

Please read this manual carefully and

thoroughly before using this product.

TABLE OF CONTENTS

Introduct on . . . . . . . . . . . . . . . . . 2 – 3

Key Features . . . . . . . . . . . . . . . . . . . . 4

What’s n the Box . . . . . . . . . . . . . . . . 4

Product Overv ew . . . . . . . . . . . . . 4 –6

Setup Instruct ons . . . . . . . . . . . . 6 –7

Install Battery . . . . . . . . . . . . . . 6 –7

Operat ng Instruct ons . . . . . . . . . 7 –8

Mak ng Bas c Measurements . . 7 –8

Cal brat ng the Meter . . . . . . . . . 8 – 10

Spec f cat ons . . . . . . . . . . . . . . . . . . 11

Operat ng & Ma ntenance T ps . . . . . 12

Warranty Informat on . . . . . . . . . . . . 13

Return for Repa r Pol cy . . . . . . . . . . 14

INTRODUCTION

Thank you for purchasing General Tools

& Instruments’ EP8703 Calibratable

3-Function Thermo-Hygrometer. Please

read this user’s manual carefully and

thoroughly before using the instrument.

The EP8703 can measure any

environment’s ambient temperature,

relative humidity (RH) and dew point. These

measurements are typically made by three

groups of users:

• 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.

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 EP8703 is powered by one “9V” battery

(included).

KEY FEATURES

• umbo 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. 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 EP8703’s controls, indicators

and physical structures

A. Humidity and temperature sensors

B. LCD

C. (Power on/off) button

F/C

button

E. Battery compartment

DEW

button

Fig. 2. All possible display indications and

their eanings

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. Set

the cover and screw aside.

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.

OPERATING

INSTRUCTIONS

MAKING BASIC

MEASUREMENTS

Before making any measurements, rotate

the sensor protection cap with your thumb

and index finger so the three vents are open

to the ambient environment from both the

front and back. Press the 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 te perature

(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.

By default, the EP8703 displays ambient

and dew point temperatures in °F.

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.

To disable the APO function

, power

on the unit in a special way by pressing and

holding the

DEW

button while pressing the

button. The LCD will confirm that you

are disabling the APO function by displaying

its complete set of icons 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 EP8703

, press and hold

the button for at least 3 seconds.

CALIBRATING THE METER

Your EP8703 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 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.

To disable the APO function

power on the unit in a special way by

pressing and holding the

DEW

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.

2. 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 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. 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.

7. 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.

8. The unit is calibrated when two cycles—

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.

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