Precision Digital PD6310 - Manual (Page 79)

Model PD6210 & PD6310 Batch Controllers Instruction Manual
79
Square Root Linearization (Square)
The square root function can be used to linearize the signal from a diffe-
rential pressure transmitter and display flow rate in engineering units.
Programmable Exponent Linearization (Prog E)
The programmable exponent can be used to linearize the signal from
level transmitters in open-channel flow applications using weirs and
flumes.
Multi-Point Linearization (Linear)
Controllers are set up at the factory for linear function with 2-point linea-
rization. Up to 32 linearization points can be selected under the linear
function.
The multi-point linearization can be used to linearize the display
for non-linear signals such as those from level transmitters used to
measure volume in odd-shaped tanks or to convert level to flow using
weirs and flumes with complex exponent.
Program
Number of
Points
Linear
Functn
no Pts
Linear
scALE
Select
Low-Flow Cutoff (CutofF)
The low-flow cutoff feature allows the controller to be programmed so
that the often-unsteady output from a differential pressure transmitter, at
low flow rates, always displays zero on the controller.
The cutoff value may be programmed from 0 to 999999. The controller
will display zero below the cutoff value. Programming the cutoff value to
zero disables the cutoff feature.