3-19
1010ENFM-3B
Section 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 Flowmeters
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.
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 proper mounting assembly. Temperature mea-
surement anomalies resulting from variations in the ambient conditions can be minimized by insulating
the pipe and sensor after installation.
1012EC SERIES CABLE
THREADED PIPE FITTING
THERMOWELL
THERMAL COUPLANT
PIPE WALL
991TW TEMPERATURE SENSOR
CONNECTOR HEAD ASSEMBLY
SPRING LOADED
SENSING ELEMENT
UPSTREAM TRANSDUCER
DOWNSTREAM
TRANSDUCER
STRAP TENSIONING SCREW
TRANSDUCER
CLAMPING SCREW
PIPE
TRACK RAIL
MOUNTING STRAP
TRANSDUCER BRACKET
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