Mighty Module MM4001 User manual

MM4001 &
MM4001ISO
RTD INPUT
TRANSMITTERS
DESCRIPTION
TheMM4001modulesareusedtoprovide
anoutputvoltageorcurrentproportional
to an RTD input signal. It is useful in
measuring temperatures with a variety
of RTD materials.
The module utilizes a single constant-
current source to excite the RTD and
alsohasanaccurateandstableleadwire
compensation circuit for compensating
3-wire RTDs against leadwire effects.
The MM4001ISO utilizes pulse width
modulation to develop a pulse train with
a duty cycle proportional to input signal
amplitude. This pulse train is coupled
through a pulse transformer where the
duty cycle data is converted to a
proportionalDClevelintheoutputcircuit.
OPTIONS
The following options are available on the
MM4001&MM4001ISO:
UAll 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
accessible from the top of the module.
CALIBRATION
The MM4001 modules are shipped
precalibrated, if there is a need to
recalibrate, proceed as follows:
Refertotheinstrument'slabeltodetermine
yourinstrument'ssupplyvoltageandinput
and output ranges. Refer to the "Block
Diagram and Pin Connections" for pin
connections.
Connect a precision decade resistance,
potentiometer or RTD simulator to the
input. To avoid errors due to the
resistances of the connection wires,
use a three-wire connection as shown
in the “Block Diagram and Pin
Connections”. Connect a precision DC
voltage or current meter to the output.
Set the input resistance to the low end of
the input range and adjust the ZERO
control for the low-end output voltage or
current. Increase the input resistance to
fullscaleandadjust the SPANcontrolfor
the full-scale output. Repeat until both
readings are correct.
CASE DIMENSIONS INCHES [mm]
MOUNTING
The module is designed to plug into a
standard 8 pin relay socket. (MP008) is a
moldedplasticsocketthatcanbemounted
on a flat surface or snapped into 2¾ inch
wide PVC track (TRK 48).
A spring hold-down clip (CLP1) is avail-
able for installations where vibration may
be a problem.
A DIN-rail mounted socket (DMP008) is
available for 35mm symmetrical rail.
AKillark HK Seriesexplosion-proof hous-
ing 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.
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SPECIFICATIONS
RTD Input
3-wire or 2-wire, 10 ohms to 2000
ohms
Input Range
select any range within RTD limit
[min span 25°F/14°C (100°F/55°C with
10 ohms RTD)]
Excitation Current
10 ohms 10 mA
100 ohms 5 mA
1000 ohms 0.5 mA
2000 ohms 0.2 mA
Output Range
Voltage
select any range from -10 V to +15 V,
10 mA max load (min span 0.2 V)
Current
select any range from 0 to 50 mA
max,
>24 V compliance (1200 ohms max at
20 mA)
18 V compliance for ISO option if
fullscale output >20 mA
Open Sensor Output
≥full scale
Accuracy
±0.1% of span
Linearity (Pt RTD, output vs temp)
±0.5% of span, (temp ³32°F/0°C)
±0.15% of span, (temp <32°F/0°C)
(others, output vs res)
±0.01% of span
Temperature Stability
±0.04% of span per °C
Common Mode Rejection
120 dB,DC to 60 Hz
Isolation (MM4001ISO)
Output/Input
>500megohms
Breakdown Voltage
>1000 VAC rms
Output Ripple (peak-to-peak)
<0.1% of span
Breakdown, Pwr/Circuitry
>1500 VAC rms
Operating Temperature
14°F to 140°F / -10°C to 60°C
Temperature Stability
±0.02% of span or 0.025°C/°C,
whichever is greater
Power
115 VAC ±10%, 50 or 60 Hz
(2.5 W max)
230 VAC ±10%, 50 or 60 Hz
(2.5 W max)
(DC Power Option)
24 VDC (limits 21 VDC to 32 VDC)
(2.5 W max)
Isolation, DC power supply to input
common: 10 megohms
Specifications are subject to change without notice. © 2007 Wilkerson Instrument Co., Inc DWG#W102234B 3/07
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