BAPI Wireless Duct Temperature & Humidity Transmitter 418MHz Catalog Page
19706_ins_wireless_duct_temp_humid_xmtr
Wireless System Overview
Wireless Duct Temperature & Humidity Transmitter 418MHz
Installation and Operating Instructions
rev. 04/21/15
418 MHz System:
The transmitter measures the temp and/or humidity
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 the Analog Output
Modules. Each transmitted temperature or humidity
variable is converted by a separate Analog Output
Module into an analog resistance, voltage or current
which is then hard wired to the analog inputs of the
BAS controller.
900 MHz System:
Transmitter
Transmits the
Temperature,
Humidity,
Setpoint and
Override Info
418 MHz
Up to 100 Feet
Fig. 2:
418 MHz
Wireless
System
Receives the Temperature, Humidity, Setpoint
and Override Info from the Transmitter and
passes it on to the Analog Output Modules
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
The transmitter measures the temp and/
or humidity 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 Re-Transmitted at
900 MHz to a 900 MHz
Transmitter
Transmits the
Temperature and
Humidity Info
Receives the 418 MHz Info from
the Transmitter and Re-Transmits
it at 900 MHz up to 1,000 feet
418 MHz
Up to 100
Feet
Repeater
900 MHz
Up to 1,000
Feet
900 MHz Receiver
Receives the Temperature and Humidity Info from the
Repeater and passes it on to the Analog Output Modules
Fig. 2: 900 MHz Wireless System
Analog Output Modules
Converts the Temperature
and Humidity Info into an
analog resistance, voltage or
current for the BAS controller
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 Modules.
Each transmitted temp or humidity variable is converted by a separate Analog Output Module into an analog resistance, voltage
or current which is then hard wired to the analog inputs of the BAS controller.
Duct Temperature and Humidity 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 1” diameter probe hole and 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 Humidity Sensor Mounting
1 of 5
Wireless Duct Temperature & Humidity Transmitter 418MHz
Installation and Operating Instructions
19706_ins_wireless_duct_temp_humid_xmtr
Analog Output Module Training
The installation process requires that each transmitter is trained to its associated output modules so that they communicate with each
other. Pushing buttons in a dened sequence on the units binds them together. 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. Be sure
to place an identication mark on the transmitter and
associated output module after training so they can be
matched at the job site.
When both temp and humidity are transmitted, each
one requires a separate output module. Perform
the training sequence for each output module. Any
transmitted variable can be trained to more than one
output module. If a Repeater is used, be sure it is powered and
within range of the transmitter and the 900 MHz Receiver to train
the output modules.
TRAINING PROCEDURE
1. To train an output module to a Temperature or Humidity
variable, select the output module calibrated to the proper
temperature or humidity range and connect it to the wireless receiver. Multiple
output modules can be trained to the same transmitter variable.
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 cover of the BAPI-Box 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. The output module’s LED will now ash about once every 20 seconds indicating data
reception.
Note: The transmitter sends both the temp and humidity data when the “Training Button” is pressed. However, each output module
is congured at the time of order as a temp or humidity module and will only recognize the relevant information.
5. Mount the transmitter at the desired location (as described 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:
Battery
Installation
and Training
Button.
Mounting and Locating of the Antennas on the 418 MHz Receiver, 900 MHz Receiver and the Repeater
The Receivers and Repeater may be located inside a metal enclosure but their antennas must be outside the enclosure. There are
three types of antennas — the 418 MHz Dipole, 900 MHz “Whip” and a 900 MHz Dipole. T
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’s should be mounted as far away 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.
o mount the 418 MHz Dipole Antenna or 900
418 MHz
Dipole
Antenna
rev. 04/21/15
Battery
polarity is
important
or damage
to the unit
may occur.
Output
Module
Service
Button
Fig. 5:
Output
Module
2 of 5
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