Amprobe THWD-3 Manuale utente

User Manual

THWD-3 and TH-3

Relative Humidity and

Temperature Meters

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THWD-3 and TH-3

Relative Humidity and

Temperature Meters

English

Contents

Relative Humidity Temperature Meters

Introduction................................................................................... 3

Safety Information........................................................................ 3

Symbols Used in this Manual........................................................ 3

Operating Instructions.................................................................. 4

Power-Up....................................................................................... 4

Selecting Temperature Units ........................................................ 4

Data-Hold Operation .................................................................... 4

Relative Operation........................................................................ 4

MIN/MAX Operation..................................................................... 4

Auto Power Off ............................................................................ 4

Dew Point and Wet Bulb Temperature........................................ 4

Low Battery Condition.................................................................. 5

Wet Bulb Temperature Readings ................................................. 5

Psychrometric Chart ...................................................................... 5

Repair............................................................................................. 6

WARRANTY ................................................................................... 7

Speciﬁcations................................................................................. 8

The THWD-3 and TH-3 are instruments to measure relative humidity

and temperature. The extended probe allows the user to make

measurements inside ducts or hard to reach areas. The Relative

and MIN/MAX functions enable measurements to be made in two

different areas and then compared. The large dual display and

Data Hold function both make viewing the measurement results

convenient. Both models utilize a capacitive sensor for humidity

measure temperature in °C or °F with 0.1 %RH resolution. Both meters

utilizes a capacitive sensor for humidity measurements up to 100%

with a tenth percent resolution. With an auto power off feature to

save battery life, protective cap for sensor life, vinyl carry case for

transportation and battery installed, the TH-3 is the right choice for

your atmospheric humidity measurement needs. Model THWD-3 has

two extra features with the capability to also indicate Dew Point and

Wet Bulb readings.

Safety Information

This meter has been designed and tested according to:

• EN50081-2

• EN50082-2

Symbols Used in this Manual

Caution! Refer to the explanation in this Manual

Caution! Risk of electric shock

Conforms to relevant Australian standards

Complies with European Directives

Power ON / OFF

Do not dispose of this product as unsorted municipal

waste

Operating Instructions

Power-Up

• Press the key to turn the Humidity/Temperature meter ON or

OFF.

Selecting Temperature Units

When the meter is ﬁrst powered on, the default scale setting is set

to the Celsius (°C ) scale. To change to Fahrenheit (°F) press the 

button. Press again to revert to Celsius. The next time the meter

is turned on, the scale setting will be the same as it was when you

powered off last time.

Data-Hold Operation

The present reading may be held on the display by pressing the 

button. When the held data is no longer needed, release the data-

hold operation by pressing the button again. When the meter is

in the Data Hold mode, the , , and buttons are disabled.

Relative Operation (TH-3 only)

Pressing the button causes the meter to memorize the present

reading. The difference between the new reading and the memorized

data will be displayed. Press the button again to exit the Relative

mode.

MIN/MAX Operation

Pressing the button places the meter in the MIN/MAX mode.

In this mode the maximum value and minimum value is kept in the

memory simultaneously and updated with every new data reading.

Pressing the button displays the MAX indicator and the Maximum

value on the display. Pressing again will display the MIN indicator

and the Minimum value on the display. Pressing again causes

the MAX and MIN indicators to blink together. This means that these

data have been updated in the memory and the reading is the present

temperature and humidity. When the meter is in MIN/MAX mode, the

and buttons are disabled. To exit MIN/MAX mode, press and

hold for two seconds.

Dew Point and Wet Bulb Temperature

(THWD-3 only) Operation

The Meter displays ambient temperature when ﬁrst turned on. To

display dew point (DP) temperature, press

DP WB

once. Press

DP WB

again

to switch to wet bulb (WB) temperature. Pressing

DP WB

a third time

returns the Meter to ambient temperature. The display indicates when

dew point and wet bulb temperatures are selected.

Auto Power Off

By default, when the meter is powered on, it is in the auto power

off mode. The meter will power itself off after 30 minutes if no key

operation is performed. To disable the auto power off feature, press

and hold the button and then power on the meter, The auto

power off symbol will disappear to indicate that auto power off is

disabled.

Low Battery Condition

When the battery voltage is under proper operation requirement, the

symbol displays on the LCD and the battery needs to be replaced.

Wet Bulb Temperature Readings (TH-3)

Occasionally the Wet Bulb temperature is required. Use the following

procedure and your TH-3 to obtain the wet bulb temperature.

1. Determine RH% condition with the TH-3.

2. Determine temperature (dry-bulb) with the TH-3.

3. Locate dry bulb (DB) temperature line on the Psychrometric chart

(vertical line across the bottom of the chart).

4. Locate relative humidity (RH) line on the chart (curved line across

the chart).

5. Find the intersection of the DB and RH lines on the chart.

6. Draw a diagonal line, starting at your intersectioin point, until the

Wet Bulb (WB) point is determined. (The wet bulb temperature line

is at the outmost curve of the chart).

For example, locate the DB temperature of 78 °F on the Psychrometer

chart. Locate the RH conditions of 50% RH on the chart. Draw a

diagonal line up to the 65 °F WB point.

Psychrometric Chart

Wet Bulb (F)

DRY BULB TEMPERATURE (F)

HUMIDITY RATIO (Lbv/Lba)

80%

60%

40%

20%

90 100 120

.028

.024

.020

.012

.008

.004

.016

Limited Warranty and Limitation of Liability

Your Amprobe product will be free from defects in material and

workmanship for 1 year from the date of purchase. This warranty

does not cover fuses, disposable batteries or damage from accident,

neglect, misuse, alteration, contamination, or abnormal conditions

of operation or handling. Resellers are not authorized to extend

any other warranty on Amprobe’s behalf. To obtain service during

the warranty period, return the product with proof of purchase to

an authorized Amprobe Test Tools Service Center or to an Amprobe

dealer or distributor. See Repair Section for details. THIS WARRANTY

IS YOUR ONLY REMEDY. ALL OTHER WARRANTIES - WHETHER

EXPRESS, IMPLIED OR STAUTORY - INCLUDING IMPLIED WARRANTIES

OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, ARE

HEREBY DISCLAIMED. MANUFACTURER SHALL NOT BE LIABLE FOR

ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES

OR LOSSES, ARISING FROM ANY CAUSE OR THEORY. Since some states

or countries do not allow the exclusion or limitation of an implied

warranty or of incidental or consequential damages, this limitation of

liability may not apply to you.

Repair

All test tools returned for warranty or non-warranty repair or for

calibration should be accompanied by the following: your name,

company’s name, address, telephone number, and proof of purchase.

Additionally, please include a brief description of the problem or the

service requested and include the test leads with the meter. Non-

warranty repair or replacement charges should be remitted in the

form of a check, a money order, credit card with expiration date, or a

purchase order made payable to Amprobe® Test Tools.

In-Warranty Repairs and Replacement – All

Countries

Please read the warranty statement and check your battery before

requesting repair. During the warranty period any defective test

tool can be returned to your Amprobe® Test Tools distributor for an

exchange for the same or like product.

Non-Warranty Repairs and Replacement – US and Canada

Non-warranty repairs in the United States and Canada should be sent

to a Amprobe® Test Tools Service Center. Call Amprobe® Test Tools or

inquire at your point of purchase for current repair and replacement

rates.

Speciﬁcations

Display: Dual display

Operating Conditions: 0°C to 40°C; <80% RH

Storage Conditions: -10°C to 60°C; <70% RH

Altitude: Up to 2000 meters, Indoor operation.

Sample Rate: 2.5 times per second

Battery: 9 V Battery, NEDA 1604 or JIS 006P or IEC6F22

Battery Life: 85-hours continuous; (with alkaline battery)

Dimension: 240x54x34 mm (9.5x2.1x1.3 in)

Weight: Approx.180g (6.4 oz.)

Accessories: Battery, instruction manual

TH-3, THWD-3

Humidity: 0% RH to 99% RH at 23°C

0˚C to 55˚C

32˚F to 131˚F

Range Accuracy

10% RH to 90% RH ± 3% RH

<10, >90 %RH ± 5% RH

Temperature Coefﬁcient: 0.1x(speciﬁed accuracy)/ °C

(<23 °C or >23 °C)

Sensor hysteresis: +/-1 %RH

Resolution: 0.1%RH

Response Time (@ t90; in slowly moving air): 180 sec

TH-3, THWD-3

Temperature:

Range Accuracy

-20°C to 60°C ± 0.8 °C

-4°F to 140°F ± 1.6°F

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