MVX 106 Two-Wire Non-Isolated Millivolt Transmitter
MVX 126 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 ADTECH 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 106 and MVX 126 Two-Wire
Millivolt Transmitter provides high accuracy conversion of
-20 to 100 mv input signals to a standard 4-20 ma de process
signal.
The MVX 126 provides 350 volts AC or 600 volts de isolation
from the input to outpuVpower supply, whereas the MVX 106
is non- isolated.
The primary features of the
MVX
106 and MVX 126 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 front accessible switches and
potentiometers.
• High accuracy, repeatability, and ambient effect
stability.
• RFI Protection: Standard.
• NO INTERACTION of ZERO and SPAN.
• Small size - universal mounting package provides
integral RFI protection and an environmental seal.
• Options for NEMA housings, SNAP TRAK and DIN rail
mounting (DIN 46 277 standard).
3.0 INSTALLATION
The instrument is supplied in a sturdy die cast aluminum
housing with an epoxy paint finish. The housing is gasketed
providing an environmental seal for the internal electronics
and controls. NEMA 4, 7 and 12, Snap Track and DIN rail
(TS32 and TS35) are optionally available. Installation area/
location must agree with the supplied instruments including
operating temperature and ambient conditions.
Mounting
Refer to page 3 for outline and mounting dimensions. The
standard instrument is surface mounted with integral #6-32
S.S. thumb screws.
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).
Two barrier terminal blocks with #6-32 screws and 0.325"
spacing are provided for I / 0 connections.
Controls
Instrument controls consist of the following:
• Two 16 position range switches for
COARSE
ZERO
and SPAN control.
• One 8 position dip switch for selection of major range.
• Two multiturn potentiometers;
FINE
ZERO and SPAN
controls.
All controls are accessible through the front of the instrument.
An integral gasketed cover provides an environmental seal for
the controls and internal electronics when the controls are not
in use.
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.
CD ©
® ©
,,�
(+)
YNPUr-1
MV
LOOPl+I
HSUPPLY
®
® I
CAUTION: Terminal #3 should not have any customer
connections.
-1-
190-A-000048-A
