MVX 206 Two-Wire Non-Isolated Millivolt Transmitter
MVX 226 Two-Wire Isolated Millivolt Transmitter
Instruction Manual
1.0 INTRODUCTION
These instructions refer to the above models. Supplementary
sheets are attached if the unit has special options or features.
For detailed specifications, see page 4 or refer to the Data
Bulletin. All AD TECH instruments are factory calibrated and
supplied with a label detailing the calibration. Adjustments
are normally not necessary. A simple check should be
performed to verify calibration before installation to ensure
that it matches the field requirement.
2.0 GENERAL DESCRIPTION
The ADTECH Model MVX 206 and MVX 226 Two-Wire
Millivolt Transmitters provides high accuracy conversion of
-20 to 100 mv input signals to a standard 4-20 ma de process
signal.
The MVX 226 provides 600 volts AC or 1000 volts de
isolation from the input to output/power supply, whereas the
MVX 206 is non-isolated.
The primary features of the MVX 206 and MVX 226 are:
• Wide range (-20) to 100 mv switch selectable.
• Zero Suppression of up to 100% of the major range
with a 16 position switch.
• Field adjustable via internal switches and front
potentiometers.
• High accuracy, repeatability, and ambient effect
stability.
• RFI resistant.
• NO INTERACTION of ZERO and SPAN.
• Small size-DIN mounting package. Only
1
"w x 3.1 "h
X 3.6" d.
• Options for NEMA housings, SNAP TRACK and
surface mounting (DIN 46 277 standard).
3.0 INSTALLATION
The instrument is supplied in a non-metallic general purpose
DIN rail mount enclosure as standard. NEMA 4 and 7
enclosures are optionally available. Installation area/location
must agree with the supplied instruments including operating
temperature and ambient conditions. For detailed mounting
and installation refer to page 4 inside.
Electrical Connections
The wire used to connect the instrument to the control
system
Input/ Output
should be twisted pair(s) and sized
according to normal practice. Shielded cable is not normally
necessary (if used, the shield must be grounded at the input
of the ADTECH instrument and left floating at the sensor).
A
six position compression terminal block is provided for the
1/0 and power connections. A housing ground terminal is not
required due to non-metallic housing.
Controls
Instrument controls consist of the following:
• Two 16 position range switches for
COARSE
ZERO
and SPAN control.
• One4 position jumper for input of major range selection.
• One 2-position jumper for 20 mv elevation.
• Two multiturn potentiometers;
FINE
ZERO and SPAN
controls on front of the instrument.
4.0 MAINTENANCE
These instruments are electronic and require no maintenance
except periodic cleaning and calibration.
If the unit appears to be mis-operating, field wiring and/or
associated circuits should be checked. MOST problems are
traced to these areas.
If the problem appears to be the instrument, it may be
checked as installed or removed for a bench check as
detailed in sections 6.0 and 7.0.
5.0 CONNECTIONS
Standard connections are shown below and on the instrument
face plate, Data Bulletin or on attached supplementary
sheets.
-1-
ADTECH
MVX
TWO WIRE
TRANSMTR
(9/96)
190-A-000070-A
