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MADE IN TAIWAN
RH820, RH820U USB & DC Power
RH820W Wireless
M4740/0109
Shop online at: omega.com e-mail: [email protected]
For latest product manuals: omegamanual.info
INSTRUCTION
SHEET
Hydro Thermometer

“HOLD” key to stop reading, all values are frozen, press
“HOLD” key again to restart reading.
5. “MAX/MIN” Button
Press “MIN/MAX” key to enter the MIN/MAX re-
cording mode and REC shows on the display. The
beeper emits a tone when a new minimum or maximum
measurement is recorded. Press “MIN/MAX” key again
to cycle through the current readings:
MAX: The highest measurement recorded.
MIN: The lowest measurement recorded.
MAX-MIN: The difference of the highest and the low-
est measurement.
AVG: The average values of the measurements.
Press “MIN/MAX” key over two seconds to exit the
function. In this mode, press “HOLD” key to stop re-
cording, all values are frozen, press “HOLD” key again
to restart recording. In this mode, the APO function and
other keys are disabled, excluding “HOLD” and
Back-light keys. Press and hold down the “MAX/MIN”
key for more than 2 seconds to exit the MAX/MIN
function.
6. “HOLD” Button
Press the “HOLD” key to enter the data hold mode, the
“HOLD” annunciator is displayed at the center-left of
display. When data hold mode is selected, the meter held
the present readings and stops all further measurements.
Press the “HOLD” key again to cancel data hold mode,
causing meter to resume taking measurements.
7. “WB/DP” Button
In the NTC data Mode, the Meter displays ambient
temperature when first turned on. To display wet
bulb (WB) temperature, press “WB/DP” key once. Press
the “WB/DP” again to switch to dew point (DP) tem-
perature. Press “WB/DP” a third time returns the Meter
to ambient temperature.
8. “K/NTC/K-DP” Button
Press the “K/NTC/K-DP” key, the meter can cycle
through “K-TYPE”, “NTC”, “K-DP”.
K-DP = K-TYPE temperature minutes Dew point
temperature.
9. “SAVE” Button
The save function stores the %RH, K-TYPE, NTC,
Wet bulb, Dew point data in a nonvolatile memory.
Press the “SAVE” key to save the current data, the word
SAVE is displayed to indicate the data are saved. The
build in memory can store up to 256 data.
10. “READ”, “ ”, “ ” Button
To recall the readings from memory, press “READ”
key. To check the memorized data just to press “ ” or
“ ” until the desired memorized data is displayed. To
return the meter to normal operation, press “READ” key
again.
CLR SAVE DATA:
Pressing the “ ” key for more than 5 seconds to
clears all the saved data in memory. And lower display
show “Clr” about 2 second.
11. WIRELESS MODE: (820W)
Press the “ ” key for more than two seconds to start
wireless function. Press the “ ” key again for another
two seconds to stop wireless function. The wireless
mode will shut down if there is no wireless signal for
two minutes.
To SET CH/ID to 00,00, press the “ ” key and “ ”
power key for more than 6 seconds with the meter pow-
ered down. The meter will set channel and ID to 00,00
status. The second display will show 00, which means
that the channel and ID has been set to 00.
To check the channel and ID of the meter:
When the meter is off, press “°C/°F” key and “ ”
for 5 seconds, LCD’s main display will show channel
number, the second display will show ID number.
OPERATOR MAINTENANCE
WARNING
To avoid possible electrical shock, disconnect the
thermocouple connectors from the thermometer before
removing the cover.
Battery Replacement
1. Power is supplied by 4pcs 1.5V (SIZE AAA) UM-4
R03.
2. The “ ” appears on the LCD display when replace-
ment is needed. To replace battery remove screw from
back of meter and lift off the battery cover.
3. Remove the battery from battery contacts and replace.
4. When not use for long time remove battery.
5. Don’t keep in place with high Temp, or high humidity.
Cleaning
Periodically wipe the case with a damp cloth and deter-
gent, do not use abrasives or solvents.
*Software operation manual is on the software disk.
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in
materials and workmanship for a period of from date of pur-
chase. OMEGA’s WARRANTY adds an additional one (1) month grace
period to the normal to cover handling and
shipping time. This ensures that OMEGA’s customers receive maximum
coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation.
OMEGA’s Customer Service Department will issue an Authorized Return
(AR) number immediately upon phone or written request. Upon examination
by OMEGA, if the unit is found to be defective, it will be repaired or replaced
at no charge. OMEGA’s WARRANTY does not apply to defects resulting
from any action of the purchaser, including but not limited to mishandling,
improper interfacing, operation outside of design limits, improper repair, or
unauthorized modification. This WARRANTY is VOID if the unit shows
evidence of having been tampered with or shows evidence of having been
damaged as a result of excessive corrosion; or current, heat, moisture or
vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components which wear is not
warranted, include but are not limited to contact points, fuses, and triacs.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor
shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used
in or with any nuclear installation or activity; or (2) in medical applications or
used on humans. Should any Product(s) be used in or with any nuclear
installation or activity, medical application, used on humans, or misused in
any way, OMEGA assumes no responsibility as set forth in our basic
WARRANTY / DISCLAIMER language, and, additionally, purchaser will
indemnify OMEGA and hold OMEGA harmless from any liability or damage
whatsoever arising out of the use of the Product(s) in such a manner.
Direct all warranty and repair requests / inquiries to the OMEGA Customer
Service Department. BEFORE RETURNING ANY PRODUCT(S) TO
OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR)
NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN
ORDER TO AVOID PROCESSING DELAYS). The assigned AR number
should then be marked on the outside of the return package and on any
correspondence.
The purchaser is responsible for shipping charges, freight, insurance and
proper packaging to prevent breakage in transit.
FOR RETURNS,
please have the following
information available BEFORE
contacting OMEGA:
1. Purchase Order number under
which the product was
PURCHASED,
2. Model and serial number of the
product under warranty, and
3. Repair instructions and/or specific
problems relative to the product.
FOR
REPAIRS, consult OMEGA for
current repair charges. Have the
following information available
BEFORE contacting OMEGA:
1. Purchase Order number to cover
the COST of the repair,
2. Model and serial number of the
product, and
3. Repair instructions and/or specific
problems relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever
an improvement is possible. This affords our customers the latest in tech-
nology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2009 OMEGA ENGINEERING, INC. All rights reserved. This
document may not be copied, photocopied, reproduced, translated, or
reduced to any electronic medium or machine-readable form, in whole or in
part, without the prior written consent of OMEGA ENGINEERING, INC.
Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…Of Course!
Shop online at omega.com
TEMPERATURE
Thermocouple, RTD & Thermistor Probes,
Connectors, Panels & Assemblies
Wire: Thermocouple, RTD & Thermistor
Calibrators & Ice Point References
Recorders, Controllers & Process Monitors
Infrared Pyrometers
PRESSURE, STRAIN AND FORCE
Transducers & Strain Gages
Load Cells & Pressure Gages
Displacement Transducers
Instrumentation & Accessories
FLOW/LEVEL
Rotameters, Gas Mass Flowmeters & Flow Computers
Air Velocity Indicators
Turbine/Paddlewheel Systems
Totalizers & Batch Controllers
pH/CONDUCTIVITY
pH Electrodes, Testers & Accessories
Benchtop/Laboratory Meters
Controllers, Calibrators, Simulators & Pumps
Industrial pH & Conductivity Equipment
DATA ACQUISITION
Data Acquisition & Engineering Software
Communications-Based Acquisition Systems
Plug-in Cards for Apple, IBM & Compatibles
Datalogging Systems
Recorders, Printers & Plotters
HEATERS
Heating Cable
Cartridge & Strip Heaters
Immersion & Band Heaters
Flexible Heaters
Laboratory Heaters
ENVIRONMENTAL
MONITORING AND CONTROL
Metering & Control Instrumentation
Refractometers
Pumps & Tubing
Air, Soil & Water Monitors
Industrial Water & Wastewater Treatment
pH, Conductivity & Dissolved Oxygen Instruments
Servicing Europe:
Benelux: Managed by the United Kingdom Office
Toll-Free: 0800 099 3344 TEL: [phone]
FAX: [phone] e-mail: [email protected]l
Czech Frystatska 184, 733 01 Karviná, Czech Republic
Republic: Toll-Free: 0800-1-66342 TEL: [phone]
FAX: [phone] e-mail: [email protected]
France: Managed by the United Kingdom Office
Toll-Free: 0800 466 342 TEL: [phone]
FAX: [phone] e-mail: [email protected]r
Germany/ Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
Austria: Tel:+ 49 (0)7056 9398-0 FAX: [phone]
Toll Free in Germany: 0800 639 7678 e-mail: [e-mail]
United OMEGA Engineering Ltd.
Kingdom: One Omega Drive
ISO 9001 CertifiedRiver Bend Technology Centre, Northbank
Irlam, Manchester M44 5BD England
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [email protected]
Servicing North America:
U.S.A.: OMEGA Engineering, Inc.
ISO 9001 CertifiedOne Omega Drive, P.O. Box 4047
Stamford, CT 06907-0047 USA
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [email protected]
Canada: 976 Bergar, Laval (Quebec), Canada H7L 5A1
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [email protected]a
For immediate technical or application assistance:
U.S.A. and Sales Service: 1-800-826-6342/1-800-TC-OMEGA®
Canada: Customer Service: 1-800-622-2378 1-800-622-BEST®
Engineering Service: 1-800-872-9436/1-800-USA-WHEN®
Mexico: En Español: 001 [phone] FAX: [phone]
[email protected] e-mail: [e-mail]
OMEGAnet®On-Line Service Internet e-mail
omega.com [email protected]m
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its
products to the European New Approach Directives. OMEGA will add the CE
mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but
OMEGA Engineering, Inc. accepts no liability for any errors it contains, and
reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be
used for, human applications.