Siemens SITRANS P User Manual download pdf (Page 203)

UMSITRPDS-1 Glossary

November 2010

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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Siemens SITRANS P User Manual Page 203