Table of Contents
Advertisement
In order to produce the best possible tracking of the true liquid temperature difference, try to
make your installation conform to the notes on the installation drawing and the following:
● Prepare the pipe surface by removing paint to expose bare metal and smoothing any
remaining rough spots.
● Use the thermal couplant (CC#117) between the face of the RTD element and the pipe
surface to improve the conductivity of the metal-to-metal contact.
● Keep the RTDs out of direct sunlight or other non-pipe sources of heat or cold that may
affect their temperature sensing. The foam insulator that is supplied helps in this regard,
but consider using additional pipe insulation for all installations exposed to extreme
ambient conditions. Consider mounting the RTDs under the pipes in order to keep them
out of direct sunlight.
● In installations where the RTD elements are exposed to harsh conditions such as
condensation, salt spray, etc., use coupling couplant to coat the connection between the
cable and the RTD sensor. Consult drawing 991TN-7 for details.
Paralleling RTD Inputs for Dual Channel Energy Measurement
To measure liquid flow in the same pipe twice (e.g. at the supply and return location of the
line) but not redundantly, you have to measure the temperature. The following information
may be helpful:
● Connect terminal #2 of terminal blocks TB1 and TB3 together and terminal #3 of TB1 and
TB3. You can use any available hookup wire to do this. By doing this, you are not
shorting terminals 2 and 3; just interconnecting 2/2 and 3/3 of each terminal block.
● Connect terminal #2 terminal blocks of TB2 and TB4 as well as Terminal #3 of TB2 and
TB4. This hookup will result in the same temperature being reported for Tr and Ts for
channels 1 and 2 of the meter. It probably is a good idea to check the temperature to
ensure that they do indeed match. Of course, Td will be similarly identical. These
temperatures can be checked in the [Diagnostics] / [Energy Data] menu.
● Be sure to accurately indicate where the flow is being measured in the [Location] item of
the menu; either supply or return.
Dual Path Models
Notes on Analog Input Modules:
● All units use T1 to report liquid temperature.
● The Analog Input of temperature takes priority over the built-in RTD (Resistive
Temperature Device) measurement of temperature.
FUE1010 IP65 NEMA 4X
Operating Instructions, 12/2014, A5E03086491-AC
Connecting
5.2 Transmitter Wiring
45
Advertisement
Table of Contents
