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Sentinel™ User’s Manual 101
Chapter 6. Transducer Replacement
Chapter 6. Transducer Replacement
6.1 Introduction
Note: For compliance with the EU Low Voltage Directive, this unit requires an external power disconnect device
such as a switch or circuit breaker. The disconnect device must be marked as such, clearly visible, directly
accessible, and located within 1.8 m (6 ft) of the meter.
IMPORTANT: Keep a detailed record of all service performed on the Sentinel in Appendix B, Service Record. This
service history may prove very helpful in diagnosing any future problems.
6.2 T11 Transducer Construction
Each T11 transducer assembly (see Figure 74 below) consists of the following components:
• A metallic body
• A flange that is an integral part of the body
• A transducer head
• A BNC style connector for use in connecting the transducer to the flowmeter
• An integral 1/2” NPT male thread on the BNC connector end for mounting the junction box.
Figure 1: General T11 Transducer Assembly
6.3 Replacing T11 Transducers in a Depressurized Pipe
If T11 transducer replacement is required and the pipeline is shut down and depressurized or if the meter is removed,
follow the procedure in this section.
WARNING!
Prior to performing any maintenance procedures, be sure to disconnect the main power
from the unit.
WARNING!
If the Sentinel is installed in a hazardous environment, the electronics enclosure must
be moved to a safe area prior to removing the covers.
WARNING!
Installation and removal of transducers should be performed only if the area is known
to be non-hazardous.
1/2" NPT Thread
Transducer Head
Metallic Body
BNC Connector
Flange