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Piping Following considerations must be kept in mind when installing the instruments. Diameter

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Field Instrumentation

Piping
Following considerations must be kept in mind when installing the instruments.
Diameter: must be large enough for the instrument to respond quickly when the pressure changes.
Length: keep instrument lines short and tight.
Slope: mount the instrument above pressure tap for gas service while below the pressure tap for liquid service.
Flexibility: changes in temperature cause piping to expand and contract. Keep lines flexible.
Temperature: to keep instrument lines from freezing, wrap electric heating cable around the line or pass low pressure steam through a thin tube wrapped around the line.

106 Field Instrumentation GEN Rev)
6. HART Communication

OBJECTIVES:

Upon Completion of this topic one should be able to understand

1. Why Hart communicator is required
2. Types of Hart communicators
3. Tree diagram
4. Different Configurations
5. Benefits of using HART communicator

107 Field Instrumentation GEN Rev)

6.1 Conventional transmitters

In conventional transmitters, zero and span is adjusted through Push buttons.
6.2 Smart transmitters

In SMART (Single Modular Auto Ranging Transducer) transmitters, zero and span is fed through handheld communicator, in addition to other features. Communicator is used to check the parameters of transmitter (Service, location, Span, Damping, and Alarm etc) remotely. Protocol is a set of rules instructions used for communication between different Medias. Communication techniques used by different vendors are
Yokogawa Brain
Foxboro
Foxcom Honeywell
Digicom

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