Mighty Module MM4431 Manual

MM4431
DC INPUT
POWER FUNCTION
EXPONENTIATOR
TRANSMITTER Y=X
DESCRIPTION
The MM4431 raises its input to a power and
provides an output voltage or current pro-
m
portional to that power function (Y = X ). The
exponent M can be a value between 0.2 and
5. This range covers the most common
requirements for measuring differential pres-
sure in flow applications such as encoun-
tered 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.
1
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
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 read-
ings 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).
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.
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
A
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)
2