Dwyer Instruments THI-10 Instructions d'installation et d'utilisation

Bulletin H-THI-10

The Model THI-10 Digital Thermohygrometer accurately measures

relative humidity and ambient temperature. Up to 99 readings can be

stored in non-volatile memory allowing the HVAC technician to record the

data after returning to the office. This compact thermohygrometer also

features user selectable engineering units, Maximum/Minimum functions,

dew point, and wet bulb temperature measurements. The Model THI-10

includes a soft carrying case with a belt loop for easy transportation.

OPERATING INSTRUCTIONS

Measurements

Press the “ ” button to turn the meter on.

Press and hold the HOLD button to toggle the humidity and temperature

displays.

Press the DEW/WET/%RH button to display the dew point. While

displaying dew point, press the DEW/WET/%RH button again to display

the wet bulb temperature.

Data Hold

Press the HOLD button to freeze the readings in both displays.

The “H” icon and the last readings will appear in the display.

The dew point and wet bulb temperature can be viewed while in Hold

mode.

In order to return to normal operation, press the HOLD button and the “H”

icon disappears from the display.

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

SPECIFICATIONS

Service: Humidity & temperature detection in air.

Range: Relative Humidity: 1 to 99% (non-condensing);

Temperature: -4 to 140°F (-20 to 60°C).

Accuracy: Relative Humidity: ±3%; Temperature: ±1.5°F (±0.8°C).

Display: Dual LCD Display (4 digit upper display / 3 digit lower display).

Temperature Limits: Ambient: 32 to 144°F (0 to 60°C).

Resolution: Relative Humidity: 0.1%; Temperature: 0.1°.

Power Requirements: 9V alkaline battery.

Battery Life: Approximately 200 hours.

Weight: 5.6 oz (160 g).

Agency Approvals: CE.

Specifications - Installation and Operating Instructions

Model THI-10 Digital Thermohygrometer

SECOND DISPLAY

MAIN DISPLAY

MEMORY

Storing data

Store measurement data by pressing the “MEM” button. The screen will

briefly display an “M” and the memory address number.

Retrieving Data

Press the READ button to cycle through the stored data.

Press and hold the READ button to exit memory and return the meter to

normal operation.

The meter’s internal memory can store up to 99 readings. When this limit

is reached, the screen will display “Full”. The memory must be cleared

before anymore readings can be stored.

Clearing the Memory

Turn the meter off.

Hold down the “MEM” button while powering on the meter.

“Clr” will appear on the screen when the stored data is erased.

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H-THI-10:TEMPLATE 9/18/08 9:42 AM Page 1

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

MAXIMUM / MINIMUM MODE

This mode allows the user to view current maximum and minimum

readings.

Upon entering this mode, an elapsed timer meter is reset.

This allows the user to view temperature and humidity measurements with

the elapsed timer meter displayed.

• Press the “MX/MN” button to enter this mode.

• Press the “MX/MN” button to cycle through maximum and minimum

measurements below.

• Press the DEW/WET/%RH button to view the current maximum or

minimum dew point and wet bulb temperature.

• Hold the MX/MN button for two seconds to exit MIN/MAX mode and

return to normal operation (this also resets the MIN/MAX values).

AUTOMATIC POWER OFF (SLEEP MODE)

The meter will automatically power off after the factory default setting of 30

minutes.

• To adjust the automatically power off time setting, begin by turning the

meter off.

• Hold the HOLD button while powering on the meter and release after

the first beep.

• Press the HOLD button to cycle through the below settings.

001: To disable auto power off function

002: 1 minute auto power off

003: 3 minute auto power off

004: 5 minute auto power off

005: 10 minute auto power off

006: 15 minute auto power off

007: 30 minute auto power off

008: 59 minute auto power off

• Press the MX/MN button to select the desired setting.

The auto power off function is activated each time you turn on the meter

and is automatically disabled when in MX/MN mode.

SETTING TEMPERATURE UNITS

The thermohygrometer can measure °F or °C.

• To change the units, turn on the unit by pressing the “ ” button.

• Hold down the “°C/°F” for 5 seconds to toggle the two units of

measurement.

BATTERY REPLACEMENT

The thermohygrometer incorporates visual low battery indication as

follows.

“BT”: battery power is not sufficient for accurate testing. When the low

battery icon indicates the battery is low, the battery should be replaced

immediately.

• The battery is located in the rear of the unit.

• Remove the cover and remove the battery.

• Insert one 9V battery.

It is important to allow the thermohygrometer to power off before replacing

the batteries otherwise the unit may malfunction. Dispose of used batteries

promptly and keep away from children.

MAINTENANCE

Upon final installation of the Model THI-10 Digital Thermohygrometer, no

routine maintenance is required. A periodic check of system calibration is

recommended. The Model THI-10 is not field serviceable and should be

returned if repair is needed (field repair should not be attempted and may

void warranty). Be sure to include a brief description of the problem plus

any relevant application notes. Contact customer service to receive a

return goods authorization number before shipping.

NOTICE

Maximum Temperature

& Elapsed Time

(min:sec)

Maximum Temperature

& Elapsed Time

(day:hour)

Minimum Temperature

& Humidity Reading

Minimum Temperature

& Elapsed Time

(min:sec)

Minimum Temperature

& Elapsed Time

(day:hour)

Minimum Humidity

& Temperature

Minimum Humidity

& Elapsed Time

(min:sec)

Minimum Humidity

& Elapsed Time

(day:hour)

Maximum Humidity

& Temperature

Maximum Humidity

& Elapsed Time

(min:sec)

Maximum Humidity

& Elapsed Time

(day:hour)

Maximum Temperature

& Humidity Reading

H-THI-10:TEMPLATE 9/18/08 9:42 AM Page 2

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