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DESCRIPTION
The MM4431 raises its input to a power and
provides an output voltage or current proportional to that power function (Y = Xm). The
exponent M can be a value between 0.2 and
5. This range covers the most common
requirements for measuring differential pressure in flow applications such as encountered in orifice plate or pitot tubes.
The range of M also includes the ranges used
to provide flow data from Parshall flumes and
V-notch weirs. In a Parshall flume, the flow
is related to the height of the liquid level by the
3/2 power of the height. In a V-notch weir,
flow is related by the 5/2 power to the liquid
height.
The MM4431 uses a complex integrated
circuit to find the exponent of the input
signal. The exponent is chosen by the choice
of two precision resistors and allows the unit
to be factory-scaled for a wide selection of
exponent values.
The following tables show the input/output
relationship for square root, using 4-20 mA
inputs and outputs.
MM4431
DC INPUT
POWER FUNCTION
EXPONENTIATOR
TRANSMITTER Y=X
m
OPTIONS
The following options are available of the
MM4431:
U All circuit boards conformal coated for
protection against moisture.
DC Power Inverter-isolated 12 V or 24 V DC
power.
CONTROLS
Two controls, ZERO and SPAN, are available
at the top of the module. The exponent, M,
is not adjustable
SPECIFICATIONS
Input Impedance
Voltage
100K
Current
1.25V drop std at 20 mA,
others available
Output Limits
Voltage
-10 to +15 V, 10 mA
Current
50 mA, 24V compliance
Accuracy
0.4 £ M £ 4
±0.15% of span
Isolation
Input/Output
greater than 500 megohms
1000 VAC rms
Temperature Stability
±0.04% of span per ° C
Common Mode Rejection
100 dB, DC to 60 Hz
Temperature, Operating
0 ° C to 60 ° C
32 ° F to 140 ° F
POWER (2.5 MAX)
115 VAC ±10%, 50 or 60 Hz
230 VAC ±10%, 50 or 60 Hz
(DC Power Option)
12 VDC (limits 10 VDC to 15 VDC)
24VDC (limits 21 VDC to 32 VDC)
CALIBRATION
The MM4431 is shipped precalibrated. If
there is a need to recalibrate, proceed as
follows:
Refer to the instrument's label to determine
your instrument's supply voltage, exponent
(M), and input and output ranges. Refer to
the "Block Diagram and Pin Connections" for
pin connections.
Connect a precision DC voltage or current
source to the input. Connect a precision DC
voltage or current meter to the output.
Set the input to the low end of the input range
and adjust the ZERO control for the low-end
output voltage or current. Increase the input
to full scale and adjust the SPAN control for
the full-scale output. Repeat until both readings are correct.
MOUNTING
The module is designed to plug into a standard
8-pin relay socket.
MP008 is a molded plastic socket suitable for
mounting on a flat surface or in a 2 3/4 inch
wide PVC snap track TRK48. Socket DMP008
is a 8-pin DIN rail mounted socket.
Use CLP1 hold-down clip if needed for
vibration environment (MP008 only). A
Killark HK Series explosion-proof housing
with dome and 8-pin socket is available HKB-
HK2D-8.
WARRANTY
The Mighty Module Series of products carry
a limited warranty of 10 + 5 years. In the
event of a failure due to defective material
or workmanship, during the 10 year period,
the unit will be repaired or replaced at no
charge. For a period of 5 years after the
initial 10 year warranty, the unit will be
repaired, if possible, for a cost of 10% of
the original purchase price.
Relays are not covered by the warranty.
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I
OUT VERSUSI IN FOR M=1.5I OUT VERSUSI IN FOR M=2.5
I
IN
I
OUT
I
IN
I
OUT
4.000 4.000 4.000 4.000
5.000 4.250 5.000 4.016
6.000 4.707 6.000 4.088
7.000 5.299 7.000 4.244
8.000 6.000 8.000 4.500
9.000 6.795 9.000 4.873
10.000 7.674 10.000 5.378
11.000 8.630 11.000 6.026
12.000 9.657 12.000 6.828
13.000 10.750 13.000 7.797
14.000 11.906 14.000 8.941
15.000 13.121 15.000 10.270
16.000 14.392 16.000 11.794
17.000 15.718 17.000 13.521
18.000 17.096 18.000 15.459
19.000 18.524 19.000 17.616
20.000 20.000 20.000 20.000
I
OUT VERSUSI IN FOR M=0.5I OUT VERSUSI IN FOR M=M2
I
IN
I
OUT
I
IN
I
OUT
4.000 4.000 4.000 4.000
5.000 8.000 5.000 4.063
6.000 9.657 6.000 4.250
7.000 10.928 7.000 4.563
8.000 12.000 8.000 5.000
9.000 12.944 9.000 5.563
10.000 13.798 10.000 6.250
11.000 14.583 11.000 7.063
12.000 15.314 12.000 8.000
13.000 16.000 13.000 9.063
14.000 16.649 14.000 10.250
15.000 17.266 15.000 11.563
16.000 17.856 16.000 13.000
17.000 18.422 17.000 14.563
18.000 18.967 18.000 16.250
19.000 19.492 19.000 18.063
20.000 20.000 20.000 20.000
Specifications are subject to change withoout notice. © 2008 Wilkerson Instrument Co., Inc. DWG#101065B 06/08
SEE INSTRUMENT LABEL
FOR POWER INPUT
CASE DIMENSIONS INCHES [mm]
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