Omega Products OMWT-TEMPRH User Manual
Wireless Temperature and
Humidity Transmitter
OMWT-TEMPRH
Starts at
$
200
⻬ Transmits Up to
180 m (600') *
⻬ 64-Bit Unique ID
⻬ Up to 100 Sensors
Can Coexist
⻬ 2 to 5 Year Battery Life
⻬ Compact ABS Enclosure
⻬ Complies with Part 15
of FCC Rules
⻬ Internal Loop Antenna
The OMWT-TEMPRH wireless
temperature and relative humidity
transmitter is a battery-operated
digital temperature and relative
humidity sensor with a microprocessorcontrolled 418 MHz FCC certified
radio transmitter. It has an on-board
time of day clock that allows it to
spend most of the time in a lowpower quiescent state. At
predetermined time intervals, the
clock will wake up the on-board
microprocessor. Unique serial
number information, along with
digital temperature and relative
humidity data, are read from
semiconductor digital temperature
and relative humidity sensors. This
information is combined with a
CRC-16 error check and transmitted
in a very short data packet that
results in a transmitter “on” time of
only 15 milliseconds. This architecture
allows the OMWT-TEMPRH to
consume very little energy, resulting
in a battery life of up to 2 years.
The electronics are coated with a
conformal rubber material that
provides a moisture barrier against
condensation. Submersion in water
is not recommended. A hole in the
top ABS cover permits a special tool
to be inserted to activate the service
switch. The OMWT-TEMPRH is
shipped with the transmitter turned
off (anytime the device is to be
shipped, the transmitter should be
turned off; otherwise, it must be
placed in a shielded container to
prevent interference that might
cause shipping problems).
OMWT-SOFT, $100,
displays real-time
historical chart or
numerical data
Start the device by pushing the
service switch (the user will feel the
button click). When the service
switch is pushed, a data
transmission immediately occurs
and a special mark is placed in the
ID field of the transmitted data
packet to indicate which device is
in service or installation.The service
switch is also used to put the
device in a quiescent mode (no
transmissions and very low power
consumption). This is the state the
device is in when the user receives
it. Push and hold the service switch
for 10 seconds or more to enter this
powered-down state.
With the OMWT Series Windows
software, incoming data being
received from OMWT Series
wireless transmitters can be viewed
in a real-time, historical time-based
chart or in a numerical view.
High/low alarms can be set for each
transmitter signal with either a visual
or audible alarm indication on the
PC. Data can also be logged to disk
at a user-specified rate in a text file
format that can be opened into
Microsoft Excel. The OMWT Series
Windows software includes a DDE
To Order (Specify Model Number)
Model No. Price Description
OMWT-TEMPRH $200 Wireless temperature and humidity transmitter
OMWT-REC232 222 Wireless receiver and 1.8 m (6') RS-232 cable
with D89F termination
OMWT-SOFT 100 OMWT Series Windows software (WIN/NT/2000/XP)
OM-NOMAD-BATT 12 Replacement 3.6 V lithium battery
Comes with complete operator’s manual.
* Depending on environmental conditions.
Ordering Example: OMWT-TEMPRH wireless temperature and humidity transmitter,
OMWT-REC232 wireless receiver and OMWT-SOFT Windows software, $200 + 222 + 100 = $522.
C-1
C
OMWT-TEMPRH ,
$200, shown larger
than actual size.
server that can interface the data
being received from OMWT Series
wireless transmitters to other
Windows software packages.
Specifications
Transmission Frequency: 418 MHz
Transmission Range*: Up to
180 m (600') depending on
environmental conditions
Transmission Rate:
10 to 17 seconds random
Operating Temperature:
-40 to 70°C (-40 to 158°F)
Storage Temperature:
-40 to 70°C (-40 to 158°F)
Temperature Accuracy:
±0.5°C from -10 to 85°C
(-18 to 185°F)
Humidity: 0 to 100% RH
non-condensing
Humidity Accuracy:
±5% full scale at 25°C
Humidity Response Time:
15 sec in slowly moving air at 25°C
Battery: 3.6 V lithium battery (included)
Battery Life with Transmissions:
2 years
Shelf Life with Battery Installed:
5 years in quiescent mode
FCC Certified: FCC ID: M5ZTHL
Dimensions: 38 H x 53 W x 15 mm D
(1.5 x 2.1 x 0.6")
Weight: 43 g (1.5 oz)
AVAILABLE FOR FAST DELIVERY!
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