Dwyer THI2-10 User Manual

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Model THI2-10 Digital Remote Sensing Thermohygrometer

Specifications - Installation and Operating Instructions

he THI2-10 Digital Remote Sensing Thermohygrometer accurately takes

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humidity, temperature, dew point and wet bulb temperatures inside of ducts and hard
to reach areas. English and metric engineering units as well as the type of
measurement displayed can be easily selected using the push buttons. The push
buttons also allow the user to freeze the current reading or retrieve the minimum and

aximum readings. A large backlit LCD digital dual display allows the user to see both

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he temperature and humidity simultaneously and a low battery indicator shows the

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ser when to change batteries. For hands free operation, the thermohygrometer can

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be mounted on a tripod. All units include 4 AAA batteries and a hard carrying case for
safe

OPERATING INSTRUCTIONS
LCD & Keypad:

SPECIFICATIONS

ervice: Humidity and temperature detection in air.

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ange:

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elative humidity measurement range: 0 to 100%;

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Temperature range: 14 to 140°F (-10 to 60°C);
Dew point temperature range: -100 to 139.8°F (-73.4 to 59.9°C);
Wet bulb temperature range: 7.88 to 139.8°F (-13.4 to 59.9°C).

Accuracy:

elative humidity accuracy: ±3% from 10 to 90% (at calibration

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temperature); ±5% for others;
Temperature accuracy: ±1°F (±.6°C).

Display: Dual LCD display for temperature and humidity.
Temperature Limits:

Ambient: 32 to 122°F (0 to 50 C);
Storage: 68 to 140°F (-20 to 60°C).

Resolution:

Temperature resolution: 0.1°C/°F;
Humidity resolution: 0.1% RH.

Power Requirements: 4 AAA batteries included.
Weight: 5.3 oz (150 g).
Agency Approval: CE.

Power ON/OFF:

1. Press the button to turn on the meter and enter normal mode. Unit will
automatically turn off after 20 minutes without any buttons being pressed.

2. Press the same button to turn off the meter in any mode.

Back Light:

Press the key to turn on the back light of the LCD for 10 seconds.

Unit Selection:

In normal mode, press to switch the units between °C and °F.

Hold Reading:

1. Only in normal mode, press to freeze the current reading.

2. Press again to return to normal display.

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

Phone: [phone] www.dwyer-inst.com

Air/Dew Point/Wet Bulb:

Press and hold to switch between air temperature, dew point (DP) and wet bulb
temperature (WBT) in normal mode.

urrent/Min./Max Values:

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. Press to cycle the display between the current value, minimum value, and

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aximum value.

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2. Press and hold more than one second to reset the minimum and maximum
values.

isable Automatic Shut Off:

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hile the meter is off, press + to turn on the meter for continuous use.

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alibration:

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1. To turn off the meter, plug the meter probe into a 32.8% salt bottle and hold the +

key for more than one second to turn on the meter and enter calibration mode.

2. You will see 3x.x% is flashing on the LCD.

After 30 minutes, the “3x.x%” will stop flashing, meaning that the calibration is finished
and saved. You can also manually end and save the calibration by holding the key
for more than one second.

. Move the meter probe into a 75.3% salt bottle and hold “MN/MX/RST” for more than

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ne second to enter the 7x.x% calibration. “7x.x% will flash on the LCD”.

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. “7x.x%” will stop flashing after 30 min. The calibration has been completed. You can

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manually end and save the calibration by holding the key for more than one
second.

NOTICE

b) In order to get a high accuracy, you must do the calibration at 23 ± 2°C (69.8 ±

3.6°F) and in a steady airflow room.
c) Once the calibration is finished, if the value differs from 7x.x% or 3x.x% for more than
.3%, it means the calibration has failed (see troubleshooting 3.)

a) Auto power off is automatically disabled during calibration
procedure.

Troubleshooting:

Symptom

ower On But No Display

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isplay Disappeared

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Calibration Failure

Display Message E11

isplay Message E33

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isplay Message E34

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OTICE

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MAINTENANCE/REPAIR

pon final installation of the Model THI2-10, no routine maintenance is required. The

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odel THI2-10 is not field serviceable and should be returned if repair is needed.

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ield repair should not be attempted and may void warranty.

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WARRANTY/RETURN

Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact
customer service to receive a Return Goods Authorization number before shipping the
product back for repair. Be sure to include a brief description of the problem plus any
additional application notes.

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solution will also result in “E 33” or “E 34” in max. and min. mode.

Action

ake sure the time of pressing the key is more

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han 100 ms.

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heck that the batteries are in place, good contact

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and correct polarity.
Replace new batteries and try again.
Move the batteries away for one minute and install

gain.

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heck whether the low battery indicator is on before

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he display disappeared. If yes, replace with new

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atteries.

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Turn on the meter by pressing the + key
to disable auto power off function for long time usage.
Check whether the low battery indicator is on before

he display disappeared. If yes, replace with new

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atteries.

b

ake sure that the sealing is good when plugging the

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meter probe into the salt bottle.
Make sure the free air temperature is within 23 ±2°C
(73.4 ±35.6°F) and the airflow is stable.
RH calibration error, re-calibrate.

ircuit error in RH measurement, return the meter to

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ts dealer.

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ircuit error in temperature measurement channel,

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return the meter to its dealer.

hen the meter is on, pluging the probe into the calibration

©Copyright 2011 Dwyer Instruments, Inc. Printed in U.S.A. 8/11 FR# R6-443937-00

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]