Temperature Input
The Series 3050 BTU flow monitor can accept inputs from either a pair of thermistors or RTDs . The inputs are labeled
T1
and
T2
. Since the
T1
sensor is used to convert the volumetric flow (Example: GPM) to the mass flow (Example: Lbs/Hr) used in the
BTU calculations, the sensor connected to
T1
should be in the same supply or return line as the flow sensor .
The temperature inputs of the flow monitor are extremely versatile . In addition to the factory default two-wire 10k @ 77° F
Type II Thermistors and three-wire 100 Ω platinum RTDs, the unit can be programmed in the field for a wide variety of custom
RTDs and thermistors . See the
page 18 through page 25
. Contact the factory for assistance
with any custom inputs .
1 TEMP 1 IN +
2 TEMP 1 IN -
3 TEMP 1 GND
4 SHIELD
5 TEMP 2 GND
6 TEMP 2 IN -
7 TEMP 2 IN +
Jumpers
2 Wire
Thermistor
Located
in same
Supply
or
Return line
Flow Sensor
2 Wire
Thermistor
Figure 8: Wiring two-wire thermistors and RTDs
3 Wire
RTD
T1
Located
in same
Supply
or
Return line
as
Flow Sensor
3 Wire
RTD
Same Colored 2 Wires
Different Color Wire
Different Wir e
1 TEMP 1 IN +
2 TEMP 1 IN -
3 TEMP 1 GND
4 SHIELD
5 TEMP 2 GND
6 TEMP 2 IN -
7 TEMP 2 IN +
Figure 9: Wiring three-wire RTDs
Installation
Page 11
June 2018
DSY-UM-01668-EN-02
