Liquid Controls SP4000 - Manual (Page 113)

SP4000 Flow Computer
110
Full Scale
The value of the process variable at the full scale or maximum input signal.
Inlet Pipe Bore
The internal pipe diameter upstream of the flow measurement element.
Isentropic Exponent
A property of a gas or vapor utilized in orifice meter calculations.
K-Factor
The calibration constant for a pulse producing flowmeter expressed in pulses per unit volume
Linear
A flow measurement device where the output signal is proportional to flow.
Linear 16 Pt.
A mathematical approximation to a nonlinear device where by a correction factor or K-Factor table as a function of input signal is
utilized to eliminate flowmeter nonlinearity.
Low Flow Cutoff
The value of input signal below which flow rate may be assumed to be 0 and at which totalization will cease.
Low Scale
The value of the process variable at the zero input signal.
Manual
An entry value to be used as a fixed condition in a equation
Meter Exp. Coef.
A coefficient in an equation which may be used to correct for changes in flowmeter housing dimensioned changes with
temperature.
Mole %
The % composition of an individual gas in a gas mixture.
NX-19
A series of equations used to compute the compressibility of natural gas as a function of specific gravity, temperature, pressure
and gas composition.
Protocol
An agreed upon method of information exchange.
Print Initiate
A user specified condition which must be satisfied for a transaction document to be printed.
Pulse Type
A menu selectable equivalent pulse output stage.
Pulse Value
An output scaling factor defining the equivalent amount of flow total represented by 1 output pulse.
Ref. Z-Factor
The Z-Factor for a gas at reference conditions of temperature and pressure.
Ref. Density
The density of a fluid at reference conditions of temperature and pressure.
Relay Function
The assigned usage for a relay output.
Relay Mode
The user’s desired operating mode for the relay. Examples: follow, latch, timed pulse, above setpoint, below setpoint
Safe State
The state of an instrument's outputs which will occur during a power down state. The state the instrument assumes when the
computations are paused.
11. Glossary of Terms (Continued)