5
Figure 9: Sample Wiring Diagram to BACnet Network
Note 1: Biasing, circuitry, and resistors for PU, PD, and NT terminals are integral part of 340BN transmitter.
Note 2: For the final 340BN transmitter in a given BACnet network, NT, PU, and PD jumpers should be in “open” position. Otherwise,
NT, PU, and PD should be in the “closed” position.
Note 3: For the final 340BN transmitter in a given BACnet network, all three network terminals (+), (-), and REF should be connected
to the BACnet buss. Otherwise, connect only terminals (+), (-) to the BACnet buss.
Temperature Element Wiring
Thermistors
Badger Meter thermistors are not polarity sensitive. The ther-
mistor located closest to the flow sensor, termed temperature
sensor T1, should be connected to terminals 2 and 3 on terminal
block Temp 1. The thermistor located farthest from the flow sen-
sor, termed temperature sensor T2, should be connected to ter-
minals 2 and 3 on terminal block Temp 2. As shown in the ther-
mistor wiring diagram, it is strongly recommended to install a
jumper between terminals 1 and 3 for both thermistors. This is
considered good practice for all unused inputs to limit electro-
magnetic interference.
Resistance Temperature Detectors (RTD’s)
Badger Meter RTD’s are three-wire devices. Two of these wires
are the same color, and one of these two wires is used for lead
compensation. The lead compensation wire is attached to termi-
nal 1. The other common color lead is attached to terminal 3.
The single color lead is attached to terminal 2. The RTD located
closest to the flow sensor, termed temperature sensor T1, should
be connected to terminal block Temp 1. The RTD located far-
thest from the flow sensor, termed temperature sensor T2, should
be connected to terminal block Temp 2.
Connecting the BACnet
®
Buss
As shown in the BACnet Sample Wiring Diagram, the position of
jumpers on each 340BN transmitter and wiring between each
340BN transmitter and the BACnet network are different depend-
ing on where the transmitter is installed, i.e. its nodal position.
For all but the final 340BN transmitter in a BACnet network, the
three jumpers NT, PU, and PD should be in the open position,
and only the (+) and (-) network terminals should be connected
to the BACnet buss. For the final 340BN transmitter in a BACnet
network, the three jumpers NT, PU, and PD should be in the closed
position, and all three network terminals (+), (-), and REF should
be connected to the BACnet buss.
Note: The Model 340BN transmitter default polling address
must be changed before it is introduced into an existing net-
work to avoid possible address conflicts. Please refer to
programming instructions in the next section.
Figure 8: RTD Wiring Diagram
Supply
Return
Te
m
p 2
1
2
3
Te
m
p 1
1
3
2
Ω
10k
Thermistors
Jumpers
1
2
3
Temp 1
1
3
Temp 2
2
Supply
Return
100
Ω
RTD’s or 1000
Ω
RTD’s
+5 VDC
Ω
Ω
Ω
Ω
Ω
Ω
Node "n"
Node 1
Comm LED
REF
PU
PD
NT
_
+
47k
120
47k
Comm LED
REF
PU
PD
NT
_
+
+5 VDC
47k
120
47k
REF
-
+
MS/TP
®
BACnet
PU
Note 2
Note 1
Note 2
Note 3
NT
PD
PU
NT
PD
Figure 7: Thermistor Wiring Diagram
