Oregon Scientific EW91 Owner's Manual

C8311A Size: A4

6

Main unit is searching for the sensor(s)

721

6

657

8

MAX.temperature records

MIN.temperature records

Low battery indicator

Indoor / Outdoor Thermometer

with Ice Alert

Model: EW91

USER MANUAL

Thank you for your purchase of this Indoor / Outdoor
Thermometer. Please read these instructions carefully
and keep the manual well for future reference.

The receiver unit has a clear display that shows the
indoor temperature, the maximum & minimum
temperature records in the past 24 hours as well as the
outdoor temperature measured and transmitted from
the remote sensors. It is able to receive and display
readings from up to 3 remote sensors.

The 433 MHz technology means no wire installation is
required and you can place the sensor within 30m
(100ft) from the main (indoor) unit.

OVERVIEW

RECEIVER

1

2

1.LCD display:

• Displays the outdoor and indoor temperature
records, the current channel and the low battery
indicator.

2.Ice Alert indicator light:

• Flashes when the outdoor temperature is
between -2.0°C (28°F) and 3.0°C (37°F).

3.CHANNEL key:

• Press it once to turn on the backlight for 5
seconds, and press it again to switch among
Channel 1, 2 and 3.

• Press it once to turn on the backlight for 5
seconds, and then press and hold it for 2
seconds to view the channels automatically.

• When the channels are being shown
automatically, press it to exit the automatic
display mode.

4.MIN./MAX. key:

• Press it once to turn on the backlight for 5
seconds, and then press it again to show the
minimum and maximum temperature records
in the past 24 hours.

• Press and hold it for 3 seconds to delete the
minimum and maximum temperature records.

5.°C/°F slide switch:

• Slide it to switch between Celsius and Fahrenheit.

6.SENSOR key:

• Press it once to search a sensor.

• During the reception period, press and hold it
for 3 seconds to stop the reception.

7.RESET key:

• Press it to return all values to default values.

• In case of malfunction, the unit may be required
to reset.

8.BATTERY COMPARTMENT:

• Accommodates 2 AAA size batteries.

9.BATTERY DOOR

LCD DISPLAY

1. Signal indicator

2. Channel

3. Outdoor temperature

4. Low battery indicator

5. Min and Max temperature

6. °C & °F

7. Indoor temperature

3
4

9

3
4

5

REMOTE SENSOR

1

2

3 4

5

1.LED indicator:

• Flashes when the remote unit sensor a reading.

2.Wall-mounting holder:

• Supports the sensor on the wall.

3.RESET key:

• Press it to restart the sensor and return all
values to default values.

4.CHANNEL slide switch:

• Assign the sensor to channel 1, 2 or 3.

5.BATTERY COMPARTMENT:

• Accommodates 2 AAA size batteries.

6.BATTERY DOOR

RECEPTION OF SENSOR SIGNAL

OPERATING THE TEMPERATURE STATION

1. Remove the battery door and insert 2 new AAA
size batteries as per the polarity information
marked on the battery compartment.

2. Press “RESET” key to restart the main unit.

3. Slide “°C/°F” switch to select between °C and °F.

4. Slide the battery door back on.

5. Press “CHANNEL” key to select the desired
channel.

(the icon will be flashing)

The sensor(s) cannot be found
Sensor 1 has been found

(the icon will be displayed,

and “--.-”
(Outdoor
temperature
Area)

but won't flash)

The sensor(s) cannot be found after
operating the main unit for 15 minutes

Note When the sensor signal is received, the icon
“ ” will be displayed on the LCD.

OPERATING THE SENSOR

1. Remove the battery door and slide the
“CHANNEL” switch to CH 1. (When using
additional sensors, make sure each sensor is
assigned a different CHANNEL number.

2. IInsert 2 new AAA batteries, matching polarities
(+/-).

3. Press the “RESET” key

4. Slide the battery door back on.

Note

• Place the sensor in location away from direct
sunlight and rain.

• Do not place the sensor more than 30 m (100
ft) from the main (indoor) unit.

• Position the sensor so that it faces the main
(indoor) unit, minimizing obstructions such as
doors, walls, and furniture.

• Place the sensor in a location with a clear view
to the sky, away from metallic or electronic
objects.

• Position the sensor closer to the main unit during
cold winter months as below-freezing
temperatures may affect battery performance
and signal transmission.

Tip the transmission range may vary depending on
many factors. You may need to experiment with
various locations to get the best results.

Standard Alkaline batteries contain significant amounts
of water. Because of this they will freeze in low
temperatures of approximately -12°C (10°F).
Disposable Lithium batteries have a much lower
threshold for temperature with an estimated freezing
range of below -30°C (-22°F).

Wireless ranges can be impacted by a variety of
factors such as extremely cold temperatures. Extreme
cold may temporarily reduce the effective range
between the sensor and the base station. If the unit’s
performance fails due to low temperature, the unit will
resume proper functioning as the temperature rises to
within the normal temperature range (i.e. no permanent
damage will occur to the unit due to low temperatures).

USING THE BACKLIGHT FUNCTION

In normal mode, press “CHANNEL” or “MIN./MAX.”
key once to activate the backlight for 5 seconds.

SWITCHING BETWEEN ºC & ºF TEMPERATURE
FORMATS

Slide “ºC/ºF” switch to select between Celsius and
Fahrenheit.

VIEWING THE MINIMUM AND MAXIMUM
TEMPERATURE RECORDS

1. In normal mode, press “MIN./MAX.” key twice to
show the minimum indoor & outdoor temperature
records in the past 24 hours.

2. Press it again to show the maximum temperature
records.

3. Press it again to exit.

Note Press and hold it for 3 seconds to delete the
minimum and maximum temperature records.

USING ICE ALERT FUNCTION

If the outdoor temperature range is -2.0ºC ~ 3.0ºC
(28ºF ~ 37ºF), the Ice Alert indicator light will be turned
on and flash.

BATTERY REPLACEMENT

If the low battery indicator “ ” displays beside the
outdoor temperature, it means that the battery power
of sensor is not enough, and you should replace with
2 AAA size batteries at once.
While if the low battery indicator “ ” displays beside
the indoor temperature, it indicates that you should
replace batteries of the main unit with 2 new AAA size
batteries.

Note Attention! Please dispose of the used unit or
batteries in an ecologically safe manner.

PLACEMENT OF MAIN UNIT AND SENSOR

For the sensor, place the screw on the desired wall and
hang the sensor by the recessed hole in the back of it
or simply place it on the desktop.
For the main unit, you can just place it on the table by
itself.

SPECIFICATIONS

30 m (98 ft) unobstructed

TYPE
MAIN UNIT

L x W x H

Weight
Signal frequency

Temperature
range

Temperature
resolution

Ice alert
temperature range

Power

REMOTE UNIT (EW-99)

L x W x H

Weight
Signal frequency

Number of channel
Transmission range

Temperature range

Power

DESCRIPTION

70 x 30 x 109 mm
(2.76 x 1.18 x 4.29 in)

111g
433 MHz

-5°C to 50°C (23)°F to 122°F

0.1°C (0.2)°F

3°C to -2°C
(37)°F to 28°F

2 x AAA 1.5V batteries

58 x 23 x 100 mm
(2.28 x 0.9 x 3.94 in)

52g
433 MHz

3

-20°C to 60°C (-4)°F to 140°F

2 x AAA 1.5V batteries

Note We recommend that you use alkaline batteries
with this product for longer usage and lithium batteries
in temperatures below freezing.

PRECAUTIONS

• Do not subject the unit to excessive force,
shock, dust, temperature or humidity.

• Do not cover the ventilation holes with any items
such as newspapers, curtains etc.

• Do not immerse the unit in water. If you spill liquid
over it, dry it immediately with a soft, lint-free
cloth.

• Do not clean the unit with abrasive or corrosive
materials.

• Do not tamper with the unit’s internal components.
This invalidates the warranty.

• Only use fresh batteries. Do not mix new and old
batteries.

• Images shown in this manual may differ from
the actual display.

• When disposing of this product, ensure it is
collected separately for special treatment and
not as normal household waste.

• Placement of this product on certain types of
wood may result in damage to its finish for which
Oregon Scientific will not be responsible. Consult
the furniture manufacturer’s care instructions for
information.

• The contents of this manual may not be
reproduced without the permission of the
manufacturer.

• Do not dispose old batteries as unsorted municipal
waste. Collection of such waste separately for
special treatment is necessary.

• Please note that some units are equipped with a
battery safety strip. Remove the strip from the
battery compartment before first use.

received, including interference that may cause
undesired operation.

WARNING Changes or modifications to this unit not
expressly approved by the party responsible for
compliance could void the user’s authority to operate
the equipment.

Note This equipment has been tested and found to
comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against
harmful interference in a residential installation.

This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful
interference to radio communications. However, there
is no guarantee that interference will not occur in a
particular installation. If this equipment does cause
harmful interference to radio or television reception,
which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the
interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment

and receiver.

• Connect the equipment into an outlet on a circuit
different from that to which the receiver is
connected.

• Consult the dealer or an experienced radio / TV
technician for help.

DECLARATION OF CONFORMITY

The following information is not to be used as contact
for support or sales. Please visit our website at
www2.oregonscientific.com/service/support for
all inquiries.

We

Name: Oregon Scientific, Inc.
Address: 19861 SW 95th AVe., Tualatin,
Oregon 97062 USA

Declare that the product

Product No.: EW91
Product Name: Indoor / Outdoor Thermometer
with Ice Alert
Manufacturer: IPM Concepts Limited
Address: Block C, 9/F, Kaiser Estate,
Phase 1,41 Man Yue St.,
Hung Hom, Kowloon,
Hong Kong
Telephone No.: 1-800-853-8883

is in conformity with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:

1) This device may not cause harmful
interference.

2) This device must accept any interference
received, including interference that may cause
undesired operation.

C 2009 Oregon Scientific. All rights reserved

Note The technical specifications for this product
and the contents of the user manual are subject to
change without notice.

ABOUT OREGON SCIENTIFIC

Visit our website (www.oregonscientific.com) to learn
more about Oregon Scientific products. If you’re in the
US and would like to contact our Customer Care
department directly, please visit:
www2.oregonscientific.com/service/support

For international inquiries, please visit:
www2.oregonscientific.com/about/international

FCC STATEMENT

This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1)This device may not cause harmful interference,
and (2)This device must accept any interference