User's Manual

3-15
1010NFM-3JSection 3
THERMAL COUPLANT
991T CLAMP-ON TEMPERATURE
SENSOR (MATCHED PAIR REQUIRED)
CUSTOMER’S PIPE
1012EC SERIES CABLE
992EMTN MOUNTING
ASSEMBLY
3.2 MOUNTING TEMPERATURE SENSORS
In order to accurately measure temperature differential in energy flow loops, Siemens Energy Flowme-
ters are designed to work with a pair of matched temperature sensors. These are available in clamp-
on style 991T, or in insert (thermowell) style 991TW. Both styles incorporate 1000 ohm platinum RTD’s
for high precision.
10. Connect the transducer cable, ensuring that you have observed the Upstream/Downstream orien-
tation in respect to the cable and the input jack on the flow computer. If this is a dual-channel unit,
make sure you are connecting the cables to the correct channel input jacks.
1012EC SERIES
CABLE
THREADED PIPE
FITTING
THERMOWELL
THERMAL
COUPLANT
PIPE WALL
991TW TEMPERATURE
SENSOR CONNECTOR HEAD
ASSEMBLY
SPRING LOADED
SENSING ELEMENT
Clamp-on style sensors are mounted on the surface of the monitored pipe using 992EMT series mount-
ing assemblies. Apply a generous quantity of the thermal couplant provided to the tip of the sensor and
attach it securely to the cleaned pipe surface with the propermounting assembly. Temperature mea-
surement anomalies resulting from variations in the ambient conditions can be minimized by insulating
the pipe and sensor after installation.