Temperature Sensors (Optional); Clamp-On Temperature Sensor; 991Tw Thermowell Temperature Sensor - Siemens SITRANS FUH1010PVDX Operating Instructions Manual

Section 3
NOTE: Some transducers require a right-angle adapter. This adapter should be installed before
placing the transducer in the tracks.
10. Connect the transducer cable, ensuring that you have observed the Upstream/Downstream ori-
entation 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.
3.4

TEMPERATURE SENSORS (optional)

In order to accurately measure the liquid temperature, the FUH1010PVX flowmeter can operate with a
Resistive Temperature Device (RTD) sensor. These sensors are available in clamp-on style Model 991T,
or in insert (Thermowell) style Model 991TW. Both styles incorporate 1000 ohm platinum RTD's for high
precision.
WARNING: Turn flowmeter power OFF before connecting cables to the Temperature Sensor
input.
3.4.1 991T CLAMP-ON TEMPERATURE SENSOR
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 ambient temperature conditions can be minimized by
insulating the pipe and sensor after clamp-on installation is complete.
992EMTN MOUNTING

3.4.2 991TW THERMOWELL TEMPERATURE SENSOR

The 991TW insert sensors are designed to be used in pipes equipped with Thermowells. These are
spring-loaded 1/4-inch diameter sensors with 1/2-inch NPT integral connection heads, available in sev-
eral lengths to accommodate a range of pipe sizes. Thermowells for new installations are available from
Alloy Engineering Company in Bridgeport, Connecticut.
Both types of temperature sensors are connected to the energy flowmeter via 1012EC series cables.
These four wire cables, associated drive and sensing circuits assure that measurement accuracy at the
RTD is independent of cable length.
ASSEMBLY
1012EC SERIES CABLE
991T CLAMP-ON TEMPERATURE
SENSOR(MATCHED PAIR REQUIRED)
THERMAL COUPLANT
3-19
CQO:1010PVXFM-3
CUSTOMER'S PIPE