Energy Transmitter Owner's manual

Temperature Element Wiring
Appropriate wire types and proper shielding is required for accurate temperature readings.
Since Btu calculations are based on Delta T cable, in order to maintain a balanced system, T1 and T2 wire runs should be kept
to approximately the same length, not to exceed 500 feet.
Thermistors
Badger Meter thermistors are not polarity-sensitive, therefore, wire color is unimportant. The thermistor located in the same
pipe as the flow sensor, termed temperature sensor T1, should be connected to terminals 2 and 3 on terminal block
Temp 1. The thermistor located in the other pipe, termed temperature sensor T2, should be connected to terminals 2 and 3 on
terminal block Temp 2. As shown in the thermistor wiring diagram (Figure 10), a jumper must be installed between terminals
1 and 3 for both the T1 and T2 input terminals. These terminals 1 and 3 are used for lead resistance compensation when 100
three-wire RTDs are used and must be jumpered when not used.
1
2
3
Temp 1
1
3
Temp 2
2
10KΩ
T2
T1
Supply
Return
Thermistors
Jumpers
Figure 10: Thermistor Wiring Diagram
Resistance Temperature Detectors (RTDs)
Badger Meter RTDs are three-wire devices. Two of the wires are the same color and interchangeable. One wire is
current-carrying and connects to terminal #3, and the other is used for lead compensation and is connected to terminal #1.
The single color lead is attached to terminal 2. The RTD located in the same pipe as the flow sensor, temperature sensor T1,
should be connected to terminal block Temp 1. The RTD located in the other pipe line, temperature sensor T2, should be
connected to terminal block Temp 2.
1
2
3
Temp 1
1
3
Temp 2
2
100Ω RTDs or 1000Ω RTDs
T2
T1
Supply
Return
Figure 11: RTD Wiring Diagram
Pulse Output Wiring
The 340 BN/MB Btu Energy Transmitter has solid-state switch output rated for a maximum sinking current of 100 mA at 36V
DC. In most cases the pulse out (+) terminal of the 340 BN/MB Btu Energy Transmitter will connect to the input pulse (+) and
the pulse out (–) terminal to the input pulse (–) of the receiving device. Although labeled +/–, the pulse output is not actually
polarity sensitive and can switch low level AC loads if required.
These terminals are located on a separate two-terminal removable header on the 340 BN/MB Btu Energy Transmitter, labeled
“Output.”
Installation & Operation Manual
Page 11 July 2012