Siemens SITRANS P User Manual download pdf (Page 201)

UMSITRPDS-1 Glossary

November 2010

10-1

10.0 GLOSSARY

Defined below are terms relevant to the SITRANS P DSIII transmitter, this User’s Manual, pressure

measurement technology, and HART networks.

Absolute (abs) Pressure – A pressure measured against absolute zero or a total vacuum as a reference.

The units of measurement are called absolute pressure units. For example: psia = pounds per square inch

absolute.

Adjust - Zero and full scale are adjusted using a single reference pressure. See Set.

Analog Signaling – A low-current signal of 4 to 20 mAdc from a field instrument to a primary master or

non-signaling hardware.

ANSI – American National Standards Institute

Application Point or Switch Point - The point at which the output current characteristic changes from

linear to square root when a square root output characteristic is selected (Modes 11 and 12).

AWG – American Wire Gauge

Barrier – A device designed to limit the voltage and current in a hazardous area even if certain types of

faults occur on the non-hazardous side of the barrier.

Barrier Resistance – The maximum end-to-end resistance of a barrier, as specified by the barrier

manufacturer. If both supply and return barriers are used in a network, the barrier resistance is the sum of

the end-to-end resistance of both barriers. For active barriers that use resistance to limit current, the

barrier resistance is the internal resistance between the hazardous area terminal and the barrier internal

node where voltage is regulated.

Blind - No reference pressure is applied.

Commissioning – Testing of a transmitter and associated loop to verify transmitter configuration and

loop operation (piping, valving, wiring, control algorithm, data logging, etc.).

Configuration – A database (or archive) created using a HART Communicator and downloaded to a

transmitter to define transmitter operation.

Configure/Configuring – The entering of specific parameter data into a HART Communicator to be

downloaded to a transmitter to define that transmitter’s operating characteristics.

Current Sense Resistor – The resistor in a network across which the field instrument (transmitter) signal

voltages are developed.

Damping – A user-selectable output characteristic that increases the response time of a transmitter to

smooth the output when the input signal contains rapid variations.

Digital Signaling – The high frequency HART signal.

Explosion-Proof Enclosure – An enclosure that can withstand the explosion of gases within it and

prevent the explosion of gases surrounding it due to sparks, flashes, or the explosion of the container

itself, and maintain an external temperature that will not ignite the surrounding gases.

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