Dwyer TH - Manual (Page 2)

©Copyright 1999 Dwyer instruments, Inc Printed in U.S.A. 7/03
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: [email protected]
Lit-By Fax: 888/891-4963
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 the recessed F/C CAL button (use a paper clip
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.
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 the recessed F/C CAL button (use a paper clip
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 ship-
ment (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 (800) 879-8000 for authoriza-
tion. 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, insur-
ance, and proper packaging to prevent damage in transit. This
warranty does not apply to defects resulting from action of the
user such as misuse, improper wiring, operation outside of spec-
ification, improper maintenance or repair, or unauthorized modifi-
cation. 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 consequen-
tial damages. Dwyer’s total liability is limited to repair or replace-
ment of the product. The warranty set forth above is inclusive
and no other warranty, whether written or oral, is expressed or
implied.