Dwyer TH User Manual

Model TH-10 Hygro-Thermometer Pen

Specifications– Calibration and Operating Instructions

DESCRIPTION

This portable advanced meter can measure RH from 10 % to
90% and Temperature from 14 to 113˚ (-10 to 45˚C). Advanced
features include MIN/MAX Memory, Push-button Calibration,
Display Hold, and Automatic Power Off. The Model TH-10K kit
includes Calibration bottles and a hard shell carrying case.

METER DESCRIPTION

BULLETIN H-TH

SPECIFICATIONS

RH Sensor: High precision thin-film capacitance type
Temperature Range: 14 to 122˚F (-10 to 50˚C)
RH Range: 10 to 95% RH
Resolution: Temperature: 0.1˚; RH: 0.1%
Accuracy: Temperature: ±1.8˚F (±1.0˚C); RH: ±5% (at 25˚C)
DC Power: 2032 button battery (150 hour battery life)
Response Time: 120 seconds
Dimensions: 6.9 x 1.6 x 06˝ (175 x 42 x 16 mm)

MIN/MAX Memory Recall

1. Press and hold MIN/MAX button until “MIN” appears on the
display. The reading will then be the lowest humidity and temper­ature measurements made since the meter was turned on or last
reset.

2. Press and hold MIN/MAX again until “MAX” appears on the
display. The reading will then be the highest humidity and
temperature measurements made since the meter was turned on
or last reset.
Press the MIN/MAX key again to return to normal operation.

1. RH/Temperature Sensor

2. POWER ON/OFF button

3. Data HOLD button

4. MIN/MAX Memory button

5. Calibration and units select button

6. Memory Reset button

7. RH Display

8. Temperature Display

9. Function Displays

OPERATION

Measurements
Press the ON/OFF button to turn the meter ON. After a 5 second
initialization, RH will be displayed in the upper display and
temperature will be displayed in the lower display.

Data Hold
Press the HOLD button to freeze the reading in the display.
“HLD” and the last reading will appear in the display.
Press and hold the RESET button until the “HLD” icon disappears
from the display to return the meter to normal operation.

Min/Max Memory Reset
Press and hold the RESET button until “88.8” appears in the
display to reset (clear) the MIN/MAX memory.

Automatic Power Off (Sleep Mode)
The meter will automatically shut off after a period of approxi­mately 20 minutes. To defeat this mode, press and hold the
MIN/MAX button while turning power on. Release the ON/OFF
button after the display initializes. “n” will appear in the display,
indicating that the non-sleep mode has been activated.
Sleep mode will be re-activated when the meter is turned off.

Setting Temperature Units (C or F)
CAUTION! The meter’s calibration can be corrupted if this proce­dure is not followed exactly as stated.

1. With the meter off, press and Hold the recessed F/C button
(use a paper clip or similar object to press this button) and press
the ON/OFF button. Release the F/C button when the F and C
appear in the display.

2. Press the MIN/MAX key to select C or F on the display.

3. Press the recessed F/C button to store the selection. “S” will
appear in the display.

4. Turn the meter off.
Note: Accidently pressing the RESET button during this proce­dure will corrupt the meter’s calibration.

Error Messages
An error message will appear on the display if the meter fails an
internal diagnostic test.
E2: Calibration error. Recalibration is necessary.
E5: RH sensor failure. Repair/replacement is necessary.

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]

Lit-By Fax: [phone]

CALIBRATION

The following verification and calibration procedures require the
33% and 75% RH reference bottles which are supplied with the
model TH-10K kit.

Accuracy Verification
Checking the 33% or 75% RH Calibration

1. Insert meter’s sensor into the 33% or 75% salt reference bottle

2. Place the meter and bottle inside the meter case

3. Check the reading after 40 minutes

4. Verify that the reading is within the accuracy specification

Relative Humidity Calibration (33% and 75%)
33% Calibration

1. With power OFF, insert the meter sensor into the 33% salt
reference bottle. Allow the meter to stabilize for 40 minutes

2. Press and Hold
or similar object to hold this key) and press ON. Release F/C
CAL button when the display blanks and then displays only the
small “c” and “f” symbols.

3. Press RESET. “% MIN” will appear in the display.

4. Press F/C CAL. “S” will briefly appear and then “%MAX” will
appear.

5. Turn power off. The 33% calibration is now complete.

the recessed F/C CAL button (use a paper clip

warranty does not apply to defects resulting from action of the
user such as misuse, improper wiring, operation outside of spec­ification, improper maintenance or repair, or unauthorized modifi­cation. Dwyer Instruments, Inc. specifically disclaims any implied
warranties or merchantability or fitness for a specific purpose and
will not be liable for any direct, indirect, incidental or consequen­tial damages. Dwyer’s total liability is limited to repair or replace­ment of the product. The warranty set forth above is inclusive
and no other warranty, whether written or oral, is expressed or
implied.

75% Calibration

1. With power OFF, insert the meter into the 75% salt reference
bottle. Allow the meter to stabilize for 40 minutes.

2. Press and Hold
or similar object to hold this key) and press ON. Release F/C CAL
when the display blanks and then displays only the small “c” and
“f” symbols.

3. Press RESET twice. “%MIN” and then “%MAX” will appear in
the display.

4. Press F/C CAL. “S” will appear briefly and then the meter will
return to normal operation.

5. Turn power off. The 75% calibration is now complete.

Note: The bottles contain a saturated salt solution that generates
a known and accurate relative humidity (dependent on the type
of salt) in the air above it. The calibration bottles will maintain their
accuracy as long as the salt is damp. If the salt in the bottom of
the bottle appears dry, the bottle should be replaced.

BATTERY REPLACEMENT

Use a coin to remove the battery compartment cover on the rear
of the meter. Replace the 2032 lithium battery installing it face (+)
up in the battery compartment.

WARRANTY

Dwyer Instruments, Inc. warrants this instrument to be free of
defects in parts and workmanship for one year from date of ship­ment (a six month limited warranty applies on sensors and
cables). If it should become necessary to return the instrument
for service during or beyond the warranty period, contact the
Customer Service Department at [phone] for authoriza­tion. A Returned Goods Authorization (RGA) number must be
issued before any product is returned to Dwyer Instruments, Inc..
The sender is responsible for shipping charges, freight, insur­ance, and proper packaging to prevent damage in transit. This

the recessed F/C CAL button (use a paper clip

©Copyright 1999 Dwyer instruments, Inc Printed in U.S.A. 7/03

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]

Lit-By Fax: [phone]