ProtEX-MAX PD8-6060 Explosion-Proof Dual-Input Meter Instruction Manual
51
Square Root Linearization (
Square
)
The square root function is used to calculate flow measured with a differential pressure transmitter. The
flow rate is proportional to the square root of the differential pressure. Scale the meter so that the low
input signal (e.g. 4 mA) is equal to zero flow and the high input signal (e.g. 20 mA) is equal to the
maximum flow.
Programmable Exponent Linearization (
Prog E
)
The programmable exponent function is used to calculate open-channel flow measured with a level
transmitter in weirs and flumes. The flow rate is proportional to the head height. Scale the meter so that
the low input signal (e.g. 4 mA) is equal to zero flow and the high input signal (e.g. 20 mA) is equal to the
maximum flow. This method works well for all weirs and flumes that have a simple exponent in the flow
calculation formula. For weirs and flumes with complex exponents it is necessary to use a strapping table
and the 32-point linearization of the meter.
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 each channel 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.
Round Horizontal Tank Linearization (
rHt
)
This function is used to calculate volume in a round horizontal tank with flat ends. The volume is
calculated based on the diameter and length of the tank. The tank’s dimensions can be entered in inches
or centimeters; the meter automatically calculates the volume in gallons or liters. After entering the
dimensions, complete the scaling process with the display values calculated by the meter. The meter can
be re-scaled to display the volume in any engineering unit without the need to re-enter the dimensions
again.
Note: After Scale is displayed continue pressing the Enter button until the meter completes the scaling of
the input and display values.
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