DDMC Analog Input Process Meter / Controller
Instruction Manual
39
Select Menu (
SElect
)
The
Select
menu is used to select the input signal
conditioner applied
to the input (linear, square root, programmable
exponent, or round horizontal tank), low-flow cutoff,
and analog output programming. The multi-point
linearization is part of the linear function selection.
Input Signal Conditioning (
Functn
)
The
Function
menu is used to select the input signal
conditioner applied to the input: linear, square root,
programmable exponent, or round horizontal tank
volume calculation. The multi-point linearization is
part of the linear function selection.
Meters are set up at the factory for linear function with
2-point linearization. The linear function provides a
display that is linear with respect to the input signal.
Square Root Linearization
(
Square
)
The square root function can be used to linearize the
signal from a differential 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
)
Meters are set up at the factory for linear function with
2-point linearization. Up to 32 linearization points can
be selected for PV1 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.
If the dual-scale level feature has been selected, the
menus for PV1 & PV2 are enabled. PV2 can be
programmed with up to 8 linearization points.
Round Horizontal Tank
Linearization (
rHt
)
This function automatically calculates the volume in a
round horizontal tank with flat ends.
Set the display for the desired decimal point and
engineering units before entering the round horizontal
tank function. Select units, inches or cm for the tank
dimensions. Enter the diameter and the length in
inches and the results are calculated automatically in
US gallons. Enter the diameter and length in cm and
the results are calculated automatically in liters.
The meter can be scaled to display the volume in any
engineering unit.
Note: After Scale is displayed continue pressing the
Enter button until the meter completes the
scaling of the input and display values.
rht
rht
rht
