General SAM990DW User manual

DIGITAL

PSYCHROMETER

USER’S MANUAL

SAM990DW

Please read this manual

carefully and thoroughly

before using this product.

GENERA TOO S

& INSTRUMENTS

80 White Street

New York, NY 10013-3567

PHONE (212) 431-6100

FAX (212) 431-6499

TO FREE (800) 697-8665

e-mail:

[email protected]

www.generaltools.com

SAM990D User’s Manual

Specifications subject to change

without notice

NOTICE - NOT RESPONSIBLE FOR

TYPOGRAPHICAL ERRORS.

GENERAL TOOLS & INSTRUMENTS

MAN# SAM990D

7/11/14

General Tools & Instruments

GeneralToolsNYC

INTRODUCTION

Thank you for purchasing General Tools & nstruments’

(General’s) SAM990DW Digital Psychrometer.

The SAM990DW is a psychrometer because it can

measure relative humidity (RH) as well as ambient, Dew

Point and Wet Bulb temperatures.

The Dew Point (DP) temperature 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.

The Wet Bulb (WB) 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. The WB

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.

KEY FEATURES

• Measures and displays RH as a percentage + ambient,

DP and WB temperatures in °C or °F on a dual-readout

LCD

• Min/Max memory + data hold

• 20-minute Auto Power Off (APO)

• 1-year limited warranty

WHAT’S IN THE PACKAGE

The SAM990DW comes in a blister pack with two “AAA”

batteries. A hard copy of this user’s manual is inside the

fold-over blister card.

SETUP INSTRUCTIONS

INSTALL BATTERIES

To open the battery compartment, turn the SAM990DW

over, place your thumb on the area of the battery

compartment cover marked

OPEN

, and slide the cover

down and away.

nstall the two included “AAA” batteries in series in the

compartment. To do so, slide each battery into its half of

the compartment cathode (- side) first, so the cathode

contacts the coiled spring. f the batteries have been

installed correctly, when side by side they should face in

opposite directions.

OPERATING INSTRUCTIONS

To begin, grasp the sides of the sensor protection cap at

the top of the unit and pull the cap until it releases.

To power on the unit

, press the

ON/OFF

button. After a

few seconds, the LCD will begin showing real-time RH

readings on the top line and real-time ambient

temperature readings on the bottom line.

The SAM990DW’s default temperature unit is degrees

Fahrenheit. To switch to degrees Celsius, press and hold

the

C/F

button until the lower readout changes.

To display the real-time Dew Point temperature

the lower readout, press and hold the

td/WBT

button until

appears at the lower left of the LCD.

To display the real-time Wet Bulb temperature on the lower

readout, press and hold the

td/WBT

button a second time,

until

appears at the lower left of the LCD.

To return to showing ambient temperature on the lower

readout, press and hold the

td/WBT

button a third time,

until

disappears.

DISPLAYING MINIMUM AND MAXIMUM READINGS

The SAM990DW automatically tracks the maximum and

minimum (highest and lowest) RH values and

temperatures (ambient, Dew Point and Wet Bulb) sensed

over a measurement “session”—the time during which

you make measurements at multiple locations and/or

under different conditions. Each session begins when you

power on the unit; it typically ends 20 minutes later with

the activation of the APO function.

The value of being able to quickly determine the hottest or

coolest, or wettest or driest area of several possibilities

should be obvious.

To display the minimum RH level and temperature sensed

during a measurement session, press and hold the

MN/MX

once. Doing so will cause both readings to appear

on the LCD, with the term

MIN

at the right of the RH%.

To switch to the maximum RH level and temperature

detected over the same period, press and hold the

MN/MX

button again. This will change

MIN

MAX

To resume displaying real-time readings, press and hold

the

MN/MX

button again.

To clear the Min and Max session values from memory,

press and hold the

RST

button until the LCD briefly shows

all possible display indications, and then returns to

showing real-time, Min or Max readings.

SPECIFICATIONS

Temperature Measurement Range:

-4° to 122°F (-20° to 50°C)

Temperature Measurement Accuracy: ±1.8°F (±1°C)

Temperature Measurement Resolution: 0.1°

RH Measurement Range: 0 to 100%

RH Measurement Accuracy: ±3% at 77°F (25°C)

from 10 to 90% RH; ±4% elsewhere

RH Measurement Resolution: 0.1%

Dew Point Measurement Accuracy: ±1.2°F (±0.6°C)

Auto Power Off Trigger: 20 minutes of front-panel inactivity

Dimensions: 6.7 x 1.85 x 0.5 in. (170 x 22 x 13mm)

Weight: 4 oz. (113g)

Power Source: 2 “AAA” batteries (included)

OPERATING & MAINTENANCE TIPS

When the entire displays flashes, the batteries’ voltage

has fallen below the threshold needed to assure accurate

measurements. Replace weak or dead batteries

immediately.

Never immerse the temperature-humidity sensor at the

top of the SAM990DW in liquid. Doing so will permanently

damage the sensor and void the instrument’s limited

warranty.

A small amount of condensation visible on the LCD will not

affect the unit’s accuracy.

WARRANTY INFORMATION

n the U.S, General warrants its instruments and

accessories against defects in material or workmanship

for one year from the date of purchase. General will

replace or repair the defective unit, at its option, subject to

verification of the defect.

This warranty does not apply to defects resulting from

abuse, neglect, accident, unauthorized repair, alteration, or

unreasonable use of the product.

Any implied warranties arising from the sale of a General

product, including but not limited to implied warranties of

merchantability and fitness for a particular purpose, are

limited to the above. General shall not be liable for loss of

use of the product or other incidental or consequential

damages, expenses, or economic loss, or for any claim of

such damage, expenses, or economic loss.

State laws vary. The above limitations or exclusions may

not apply to you.

We encourage you to register your product online. General

will extend your warranty an additional 60 days if you

RETURN FOR REPAIR PO ICY

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 & nstruments

80 White Street

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.

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