General EP8710 User manual

CALIBRATABLE

7-FUNCTION

PSYCHROMETER

USER’S MANUAL

EP8710

Please read this manual carefully and

thoroughly before using this product.

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . 2 –4

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

What’s in the Box . . . . . . . . . . . . . . . . . . . 5

Product Overview . . . . . . . . . . . . . . . . 5 –8

Setup Instructions . . . . . . . . . . . . . . . 8 –9

Install Battery . . . . . . . . . . . . . . . . . 8 –9

Operating Instructions . . . . . . . . . . . 9 – 12

Making Basic Measurements . . . . 9 – 11

sing the External Temperature Probe .11

Tracking Min and Max Levels . . . . . . . 12

Calibrating the Meter . . . . . . . . . . . 13 – 16

Specifications . . . . . . . . . . . . . . . . . . . . . 17

Operating & Maintenance Tips . . . . . . . . 18

Warranty Information . . . . . . . . . . . . . . . 19

Return for Repair Policy . . . . . . . . . . . . . 20

INT ODUCTION

Thank you for purchasing General Tools

& 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:

• 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 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 internal 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 FEATU ES

• umbo backlit display with 2-line readout

• Field calibratable using optional 33% and

75% salts

• Data hold and Min/Max functions

• External probe for measuring internal and

surface temperatures of objects and fluids

• °F/°C switch

• 20-minute Auto Power Off function

• Low battery indicator

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.

P ODUCT OVE VIEW

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, in icators

an physical structures

A. Humidity and temperature sensors

B. LCD

C. (Power on/off) button

HOLD

button

E. (Ambient/dew point temperature)

button

F. Battery compartment

MAX/MIN

button

H. Probe/condensation/wet bulb

temperature) button

F/C

button

. External temperature probe plugged into

jack on side of unit

Fig. 2. All possible isplay in ications an

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

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.⌬T indicator (available only with external

probe plugged in). ⌬T 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 INST UCTIONS

INSTALL BATTERY

1. 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 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.

OPE ATING

INST UCTIONS

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

at its left).

To isplay the ew point temperature

(instead of ambient temperature) on the lower

left readout, press the button. The

reading will be accompanied by the symbol

at its left. To return to displaying ambient

temperature, press the 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” 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 isable the APO function

, power

on the unit in a special way by pressing and

holding the

HOLD

button while pressing the

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.

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