Installation guide
DM251
DM251-102
Wireless Monitoring
System
with Safe & Sound
®
Digital Audio Monitor
Specifications are subject to change without notice.
© 2016 for VTech Communications, Inc.
All rights reserved. 03/16. DM251-X_IG_V2.0
Document order number: 96-010978-020-100
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3
Check and locate
Check your Open/Closed
sensor before use
Test the sensor signal strength
After testing the sensor signal strength, mark the mounting location
on the door, window, or medicine cabinet and its respective frame.
Then, remove the adhesive tape and proceed to the mounting
process.
Follow the steps in Test the sensor signal strength section in the
User’s manual to test the sensor’s signal strength with your parent
unit. Make sure you receive GOOD SIGNAL message when you
open the monitored door as usual.
4
Mount
> 1 cm
(0.4 inch)
> 1 cm
(0.4 inch)
> 1 cm
(0.4 inch)
1 cm
(0.4 inch)
Without spacer With spacer (optional)
Mount the sensor unit
Make sure both baby unit and parent
unit are on. Then, separate the
sensor unit and magnet unit.
The parent unit will emit an alert
tone, and announce “Open/Closed#
is open”. The screen will display
OPEN/CLOSED# IS OPEN.
If your package includes an Open/Closed sensor,
please read the following section.
Open/Closed sensor installation
1
Parts checklist
2
Power on
The batteries are pre-installed in
your Open/Closed sensor.
The Open/Closed sensor is already
pre-registered to the baby monitor.
The batteries operate properly
under the temperature between
0°F (-18°C) and 130°F (55°C).
•
•
•
We recommend you mount the magnet unit on a
door, window, or medicine cabinet, and mount the
sensor unit on its respective frame.
You can use the spacers provided if there is a
difference in level between the door and the
frame. The spacer will help to align your sensor
to the correct height. You can also use a spacer
if the frame is too narrow or has some decorative
molding.
You can mount the sensor unit with a mounting tape
first, and then use screws later if you decide to mount it
at that location for long term.
Make sure the mounting surface is clean. A textured
surface or any imperfections to a smooth surface can
keep the mounting tape from making a strong bond.
Align the magnet unit with sensor unit when mounting.
The distance between the sensor unit and magnet unit
must be less than 1 cm (0.4 inch).
•
•
•
•
Use adhesive tape to hold the sensor temporarily in place.
Mount the sensor to a higher position to avoid obstacles or blockages.
Depending on surroundings and obstructing factors, like walls or
cabinets, the sensor may not transmit to the baby unit properly.
•
•
With spacer (optional)
Without spacer
If NO SIGNAL or WEAK SIGNAL message is displayed in test signal mode,
or if you do not receive an alert when you open the door, move the baby unit
closer to the mounting location or move the sensor closer to the baby unit.
•
The door images in this installation guide are for conceptual reference only.
•
Sensor unit Magnet unit
Spacer for
sensor unit
(optional)
Spacers of 4 different
heights for magnet unit
(optional)
Double-sided
mounting tape C
Large screw x 2
(for fixing the
spacer on the
frame; optional)
Small screw x 2
(for fixing sensor
unit’s back cover on
the spacer; optional)
Double-sided
mounting
tape A
1 set for DM251-102
Double-sided
mounting
tape B
* The door frame is thicker than
the door.
* The door is
thicker than
the door frame.
