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3-24
1010BXFM-3
Section 3
THERMAL COUPLANT
991T CLAMP-ON TEMPERATURE
SENSOR(MATCHED PAIR REQUIRED)
CUSTOMER’S PIPE
1012EC SERIES CABLE
992EMTN MOUNTING
ASSEMBLY
3.4
TEMPERATURE SENSORS (optional)
In order to accurately measure the liquid temperature, the System 1010BX meter 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 meter power OFF before connecting cables to the Temperature Sen-
sor 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 mounting 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 measurement anomalies resulting from variations in ambi-
ent temperature conditions can be minimized by insulating the pipe and sensor after clamp-
on installation is complete.
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 several lengths to accommodate a range of pipe sizes. Thermowells for new instal-
lations 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.
the transducers with the cable connectors facing away from each other. Once the trans-
ducer is in place, Secure it with its clamping screw. Do not overtighten.
NOTE: Some transducers require a right-angle adapter. This adapter should be in-
stalled before placing the transducer in the tracks.
10. Connect the transducer cable, ensuring that you have observed the Upstream/Downstream
orientation in respect to the cable and the input jack on the computer. If this is a dual-
channel unit, make sure you are connecting the cables to the correct channel input jacks.
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