Siemens SITRANS F Operating Instructions Manual page 184

Section 3
Notes on Clamp-On RTD Installation
The Clamp-On RTD sensors with which your 1010 thermal energy meter is supplied are extremely
sensitive and precise. Their contribution to the performance of your energy meter is every bit as impor-
tant as that of the liquid flow sensors. Please consult the installation drawings at the back of this
manual for details on physical installation and wiring of the RTDs. 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 these tips:
Prepare the pipe surface by removing paint to expose bare metal and smoothing out any remaining
rough spots.
Use the thermal couplant compound (CC117) 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 which may affect
their temperature sensing. The foam insulator supplied helps in this regard, but consider using
additional pipe insulation for all installations exposed to extreme ambient conditions. Consider mount-
ing 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 couplant compund to coat the connection between the cable and the
RTD sensor. Consult drawing # 991TN-7 for details.
Be sure to install the supply RTD Sensors (see diagram on previous page) in the appropriate
locations.
Be sure to correctly indicate where the flow is being measured in the "Location" item of the 1010P
menu; either the supply or return.
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1010PFM-3G