ABB 3AFP9870097 Capillary Thermometer for Motor and Generator Bearing Temperature Monitoring

ABB 3AFP9870097 Product Overview

ABB 3AFP9870097 is identified as a Capillary Thermometer within ABB motor and generator component
documentation. Unlike an electrical temperature transmitter that requires an external power supply
and signal-processing circuit, a capillary thermometer provides a direct temperature indication through
a sensing element connected to the display by a capillary tube. This arrangement allows the temperature
sensing point and the indication point to be positioned according to the mechanical configuration of
the equipment.

In large rotating machines, temperature observation is an important part of equipment condition
monitoring. Bearings, particularly sleeve bearings, operate under mechanical and thermal conditions
that require continuous attention. A change in bearing temperature can indicate a change in lubrication,
loading, cooling conditions, alignment, or other operating characteristics. For this reason, a dedicated
temperature indication component can form an important part of the machine monitoring arrangement.

Technical Characteristics

The ABB 3AFP9870097 is associated with a capillary temperature measurement arrangement intended for
industrial motor and generator applications. Available technical information identifies the measuring
range as 0 to 120 °C. The product information also identifies the component as a capillary thermometer
for ABB motor and generator equipment.

Temperature Monitoring Function

The primary purpose of the ABB 3AFP9870097 is temperature indication. In a rotating electrical
machine, bearing temperature is a useful operating parameter because it reflects the thermal condition
of the bearing assembly and its surrounding mechanical environment. Monitoring this temperature gives
operators a direct reference when assessing whether the bearing is operating within its expected range.

Sleeve bearings are commonly used in large machines where the bearing system is integrated into a
substantial mechanical housing. The temperature sensing location may not always be directly adjacent
to the most convenient viewing position. A capillary system provides a mechanical connection between
the sensing point and the indicator, allowing the temperature display to be located where it can be
observed more easily while the sensing element remains associated with the bearing housing.

Application in ABB Motor and Generator Systems

ABB motor and generator systems can include a variety of monitoring components depending on the
machine design, operating conditions, and protection requirements. The 3AFP9870097 belongs to the
temperature-monitoring component group and can be associated with machine assemblies where visual
temperature indication is required.

The thermometer can be considered as part of a broader condition-monitoring arrangement. Other
monitoring devices may be installed on the same machine for measuring vibration, winding temperature,
bearing temperature, speed, pressure, or other operating parameters. The capillary thermometer serves
a specific role within this arrangement by providing a temperature indication at the designated
measurement location.

Capillary Measurement Principle

A capillary thermometer consists of a temperature-sensitive element connected to an indicating
mechanism through a capillary tube. When the sensing element experiences a temperature change, the
thermometric system responds to that change and transfers the measurement effect through the capillary
system to the indicator.

This mechanical measurement principle is useful in industrial equipment because the indicator does not
depend on a conventional electronic communication network. The arrangement is therefore different from
a resistance temperature detector or electronic temperature transmitter. When selecting a replacement
component, the complete mechanical configuration, sensing location, connection arrangement, scale range,
and machine-specific mounting requirements should be considered rather than relying on the product name
alone.

Bearing Temperature Observation

Bearing temperature monitoring is especially important for large rotating equipment. Excessive
temperature may be associated with insufficient lubrication, abnormal friction, mechanical loading,
cooling problems, or other operating conditions. A temperature indicator provides a visible reference
that can assist personnel in identifying changes in machine behavior.

The ABB 3AFP9870097 is therefore relevant to applications in which sleeve bearing temperature needs
to be observed directly. Its 0–120 °C measurement range corresponds to the temperature-monitoring
requirements identified for this component. Actual acceptable operating limits, alarm values, and
protective actions should always be determined from the documentation of the specific motor or
generator in which the thermometer is installed.

Installation Considerations

Installation of the ABB 3AFP9870097 should follow the mechanical arrangement defined for the associated
motor or generator. The sensing element must be positioned at the intended temperature measurement
point, while the capillary tube should be routed without creating unnecessary mechanical stress or
sharp bends.

The indicator should be positioned so that the temperature scale can be read clearly during normal
equipment operation. The capillary tube and sensing assembly should also be protected from mechanical
interference, excessive vibration, and conditions outside the specified application environment.
Because ABB motor and generator configurations can vary, mounting dimensions and installation details
should be confirmed against the machine-specific documentation before installation.

Maintenance and Inspection

Periodic inspection of a capillary thermometer should include the visible condition of the indicator,
capillary tube, sensing element, and mounting arrangement. Particular attention should be given to
mechanical damage, deformation, leakage indications, loose mounting hardware, or abnormal changes in
temperature indication.

If the indicated temperature differs significantly from expected operating conditions, the thermometer
should not be considered in isolation. Operators should also examine the bearing lubrication system,
cooling arrangement, machine load, vibration behavior, and other available monitoring parameters. This
approach helps distinguish an actual thermal change from a possible measurement or installation issue.

ABB 3AFP9870097 Identification

Correct identification is important when selecting the ABB 3AFP9870097 for a motor or generator
application. The product identification number is 3AFP9870097 and the catalog description is
Capillary Thermometer. The number should be checked against the equipment documentation, component
identification, and the existing mechanical arrangement before a replacement is specified.

Components with similar descriptions can have different sensing dimensions, temperature ranges,
mounting arrangements, or application requirements. Therefore, matching the complete ABB product
identification is preferable to selecting a component based only on the general description
“capillary thermometer.”

Conclusion

ABB 3AFP9870097 is a Capillary Thermometer used within ABB motor and generator applications for
temperature indication and monitoring. Its role is particularly associated with sleeve bearing
temperature observation, providing a mechanical method of transferring temperature information from
the sensing location to the indicator. Technical information associated with the component identifies
a 0–120 °C measuring range.

As part of an industrial rotating-machine monitoring system, the ABB 3AFP9870097 provides a direct
temperature reference that can support routine equipment observation and condition assessment. Proper
identification, installation, and interpretation of the indicated temperature should be based on the
requirements of the specific ABB motor or generator. When evaluating this component for an existing
installation, the product number, mechanical arrangement, sensing location, and machine documentation
should be considered together to ensure the correct application.