Mighty Module MM4001, MM4001ISO User Manual

MM4001 &

MM4001ISO

RTD INPUT

TRANSMITTERS

DESCRIPTION

The MM4001 modules are used to provide
an output voltage or current proportional
to an RTD input signal. It is useful in
measuring temperatures with a variety
of RTD materials.

The module utilizes a single constant­current source to excite the RTD and
also has an accurate and stable leadwire
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

proportional DC level in the output circuit.

OPTIONS

The following options are available on the
MM4001 & MM4001ISO:

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
accessible from the top of the module.

CALIBRATION

The MM4001 modules are 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 and input
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
full scale and adjust the SPAN control for
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
molded plastic socket that can be mounted
on a flat surface or snapped into 2¾ inch
wide PVC track (TRK 48).

A spring hold-down clip (CLP1) is avail­able for installations where vibration may
be a problem.

A DIN-rail mounted socket (DMP008) is
available for 35mm symmetrical rail.

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.

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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

>500 megohms

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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