BAPI Wireless Duct Temperature Transmitter 418MHz Catalog Page
19705_ins_wireless_duct_temp_xmitr
Wireless System Overview
418 MHz System:
The transmitter measures the Duct Temperature and
sends the data at 418MHz to the 418 MHz Receiver up
to 100 feet away. The transmit rate is about once every
20 seconds with an estimated battery life of 5 to 8 years
with two high-capacity 3.6V lithium batteries.
The transmitted info is picked up by the 418 MHz
Receiver and passed along to an Analog Output Module
which converts it into an analog resistance, voltage or
current which is then hard wired to the analog inputs of
the BAS controller.
900 MHz System:
The transmitter measures the Duct Temperature and
sends the data at 418MHz to a Repeater up to 100 feet
away. The transmit rate is approximately once every 20
seconds with an estimated battery life of 5 to 8 years
using two high-capacity
3.6V lithium batteries.
The 418 MHz transmitted
info is picked up by the
Repeater and then ReTransmitted at 900 MHz to
a 900 MHz Receiver up to
1,000 feet away. The 900
MHz receiver picks up the
information from the repeater and then passes it
along to the Analog Output
Transmitter
Transmits the
Temperature
Information
Module which converts it
into an analog resistance,
voltage or current which
is then hard wired to the
analog inputs of the BAS
controller.
418 MHz
Up to 100
Feet
Repeater
Receives the 418 MHz Temperature Info
from the Transmitter and Re-Transmits it
at 900 MHz up to 1,000 feet
Wireless Duct Temperature Transmitter 418MHz
Installation and Operating Instructions
rev. 04/21/15
Analog Output Modules
Converts the Temperature,
Humidity, Setpoint and
Override Info into an analog
resistance, voltage, current
or relay for the BAS controller
418 MHz Receiver
Analog Output Modules
Converts the Temperature
Information into an analog
resistance, voltage or current
for the BAS controller
Transmitter
Transmits the
Temperature,
Humidity,
Setpoint and
Override Info
418 MHz
Up to 100 Feet
Fig. 2:
418 MHz
Wireless
System
900 MHz
Up to 1,000
Receives the Temperature Information from the Repeater
Fig. 2: 900 MHz Wireless System
Receives the Temperature, Humidity, Setpoint
and Override Info from the Transmitter and
passes it on to the Analog Output Modules
Feet
900 MHz Receiver
and passes it on to the Analog Output Modules
Duct Temperature Transmitter Mounting
First train the transmitter and output modules as
shown above on the next page.
1. Place the sensor in the middle of the duct
away from temperature stratied air, coils or
humidiers to achieve the best temperature
reading.
2. Drill the probe hole as in the hole pattern graphic
shown below. Insert the probe into the duct.
3. Mount the enclosure to the duct using BAPI
recommended #8 screws through a minimum
of two opposing mounting tabs provided. A 1/8
inch pilot screw hole in the duct makes mounting
easier through the mounting tabs. Use the
enclosure tabs to mark the pilot hole locations.
4. Snug up the sensors so that the foam backing
is depressed to prevent air leakage but do not
over-tighten or strip the screw threads.
Specications subject to change without notice.
Fig 3: Wireless Duct Temperature Sensor Mounting and Hole
Pattern, Rotate 90° for Horizontal Mounting
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Wireless Duct Temperature Transmitter 418MHz
Installation and Operating Instructions
19705_ins_wireless_duct_temp_xmitr
Analog Output Module Training
The installation process requires that each transmitter is trained to its associated output modules so that they receive communications
from the correct transmitter. This is done by pushing buttons in a dened sequence on the transmitter and output module. The training process is easiest on a test bench so the units
are within arm’s reach of each other. Training can be
done in the eld but requires two people and a set of
walkie talkies or cell phones. Place an identication
mark on the transmitter and associated output module
after training so they can be matched at the job site.
Any transmitted variable can be trained to more than
one output module. If a Repeater is used, be sure it is
powered and within reception range of the transmitter
and the 900 MHz Receiver to train the output modules.
TRAINING PROCEDURE
1. To train an output module to the temperature
transmitter, select the Resistance, Voltage or
Current Output Module you want to train and
connect it to the wireless receiver. Note: Multiple
output modules can be trained to the same transmitter variable if desired.
2. Apply power to the receiver which will supply power to the connected output
modules. The power LED on the receiver will light and remain lit. (Current Output Modules
must have loop power supplied to the module itself before they can be trained.)
3. Open the BAPI-Box cover on the transmitter and remove the battery tabs or install the batteries,
observing polarity as shown in Fig 4. The small LED on the transmitter module will ash about
once every 20 seconds, indicating a transmission. (The ash is very quick.)
4. Press and hold down the “Service Button” on the top of the output module (Fig 5) that you wish
to train. Then, press and release the “training button” (see Fig 4) on the transmitter module.
When the output module receives the “training transmission” from the transmitter, the output
module’s red LED will light. Release the “Service Button” on the output module and the red
LED will go out. The transmitter and output module are now trained to each other. During
normal operation, the output module’s LED will ash about once every 20 seconds indicating data reception.
5. Mount the transmitter at the desired location (as shown on the previous page), removing the batteries if needed. (The units will
remain trained to one another through power failures and battery replacement.)
Training Button
Transmit LED
Battery
Connectors
Transmitter Module
Fig. 4:
Duct Temperature
Sensor Battery
Installation and
Training Button.
rev. 04/21/15
Battery
polarity is
important
or damage
to the unit
may occur.
Output
Module
Service
Button
Fig. 5:
Output
Module
Mounting and Locating of the Antennas on the 418 MHz Receiver, 900 MHz Receiver and the Repeater
The 418 MHz Receiver, 900 MHz Receiver and Repeater may be located inside a metal enclosure but their antennas must be outside
the enclosure. The 418 MHz Receiver comes with a 418 MHz Dipole Antenna. The 900 MHz Receiver comes standard with a 900 MHz
“Whip” Antenna but is available with a 900 MHz Dipole Antenna. The Repeater comes standard with a 418 MHz Dipole Antenna and a
900 MHz “Whip” Antenna, but is available with a 900 MHz Dipole Antenna.
To mount the 418 MHz Dipole Antenna or 900 MHz Dipole Antenna, peal off the protective lm from the adhesive pad and stick the
antenna to a wall or other non-metallic support so that antenna is vertical for best reception. Antenna’
from metal plates or bars as possible to avoid RF energy being reected back or blocked on the other side of the metal. An antenna will
not work inside a metal box. Mounting to drywall between studs, ceiling tiles, brick, or concrete is very common.
Transmission distance performance will vary based on environment. 100 feet is the maximum that can be expected if there are no
obstructions. In general, each obstruction will half the expected transmission distance. Obstructions include but are not limited to;
walls, partitions, oors, ceilings, doors, tinted
glass, ground, many people, vehicles, foliage,
rain, snow and fog. Metal (solid or screen)
blocks the RF signal preventing propagation but
also can bounce the signal around the potential
obstacle. Wood, drywall, plaster, brick, and
concrete attenuates the signal but will let it pass
(if it’s not too thick) at a reduced signal strength.
Anything that holds water absorbs the signal
to the point of blockage like rain, fog, people,
ground, dense foliage etc. Elevator shafts and
stairwells usually block RF signals.
The 900 MHz “Whip” Antenna simply screws
onto the 900 MHz Receiver or the Repeater.
Mounting the antenna on a metal surface may
limit reception from behind the surface.
Note: The Dipole antennas above are displayed horizontally to show dimensions but
Specications subject to change without notice.
900 MHz
“Whip”
Antenna
900 MHz
Dipole
Antenna
they should be mounted vertically for best reception.
s should be mounted as far away
418 MHz
Dipole
Antenna
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