Badger Meter 340LW Series Lonworks Btu Transmitter - Manual (Page 4)

4
the box cover using double-sided adhesive tape.
Temperature Sensor Installation
The location of the temperature sensors with regard to the flow
sensor is important for the accuracy of the energy calculation.
Temperature sensor T1 must be located closest to the flow sensor.
A distance of 5 pipe diameters will give the greatest accuracy.
Always install the temperature sensor downstream of the flow
sensor.
Electrical Installation
All connections to the Badger
® Series 340LW are made to screw
terminals on removable headers.
Power Supply Wiring
The Series 340LW requires 12-24 Volts AC or DC to operate. The power connections are made to the
ORANGE header. The connections are labeled beside the header. Observe the polarity shown on the label.
When powered with AC power provided by a
transformer secondary the Series 340LW causes DC
current to fl ow in the transformer secondary. When
several Series 340LWs are powered in parallel by the
same transformer secondary, the currents will add and
a suffi cient secondary DC current may fl ow to cause
transformer core saturation. Improper operation may
result.
When powering multiple Series 340LWs, a DC
power supply with appropriate output capability should
be used to prevent this situation. For instance, Sixteen
Series 340LWs will require 16 x 70mA = 1120mA. A 1.5
Amp, 12-24 Volt DC power supply would handle such a
load.
When operating a Series 340LW from AC
power, one side of the AC voltage source should be
grounded to earth ground. This grounded AC source side should be connected to the Series 340LW “ACC/
DC-” power input terminal, the other side being connected to the Series 340LW “ACL/DC+” terminal. (This
arrangement is like that in normal 110 VAC power, which has a “neutral” or common side and a “hot” or line
side.
For optimal noise immunity and when operating the Series 340LW with a “zero threshold, sine
wave” fl ow sensor, the ground lug on the Series 340LW should be connected to earth ground.
If a Badger Meter plug in type power supply (Model A-1026 or A-503) is used, connect the black/white
striped wire to the terminal marked positive (+) and the black wire to the terminal marked negative (-).
Note:
Included with every Series 340LW is a Model 340LWIK kit containing a screw,
lockwasher and ground lead to connect the Series 340LW to earth ground. Connect
the earth ground lug of the series 340LW to a solid earth ground with as short a wire
as possible. This will help prevent electrical interference from affecting the Series
340LW’s normal operation.
Side View - Typical 300 Se-
ries Removable Connector
Wiring
3/32” Flathead
Screwdriver
Series 300
Connector
Wire
Sample Power Supply Wiring Diagram