UMSITRPDS-1 Glossary
November 2005
10-3
Network Element – Any field instrument or primary or secondary master.
Network Resistance – The sum of the current sense resistance, barrier resistance, if any, and any other
resistance on the network.
NPT – National Pipe Thread
Point-To-Point Network – A network having a single field instrument and primary master. Analog
signaling or analog plus digital signaling is possible.
Polling Address – A unique number assigned during configuration that identifies a transmitter connected
to a network. An address between 1 and 15 assigned to a transmitter connected to a Multi-Drop network.
A transmitter connected to a Point-to-Point network has 0 as an address.
Primary Master – The single controlling network element that communicates with one or more field
instruments, such as a Model 353 Process Automation Controller.
Reranging – Changing a transmitter’s 4 and 20 mA settings (i.e., setting LRV and URV); this is a
configuration function.
Secondary Master – An occasional user of a network, such as the HART Communicator.
Sediment – Solid material that settles in a liquid or gas and can cause blockage that may affect pressure
measurement.
Sensor - Measuring cell
Set - Zero and full scale are set using two reference pressures. See Adjust.
Span – Algebraic difference between the upper and lower range values (URV and LRV).
Switch Point - See Application Point.
Transducer – A device that accepts an input, such as pressure, and converts that input into an output of
some other form, such as a voltage.
Upper Range Limit (URL) – The highest value of the measured variable that a transmitter can be
configured to measure.
Upper Range Value (URV) – Representing the 20 mA point in a transmitter’s output, this is the highest
value of the measured variable that the transmitter is currently configured to measure.
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