MVT 306L Non-Isolated Millivolt Transmitter
MVT 326L Isolated Millivolt Transmitter
Instruction Manual
1.0 INTRODUCTION
These instructions refer to the above model. 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 ADTE CH 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 MVT 306L and MVT 326L are low power
millivolt transmitters that accept 0.5 to 100 mv de input and
provide two of the standard signal outputs namely 1-5 vdc or
0-5 vdc.
This model consumes very low power, typically 3.5 made
and is specially designed for remote bettery on solar panel
powered applications.
The MVT 326L provides 600 vac or 1 000 vdc isolation of the
input from the output and de power supply. The MVT 306L
provides no isolation between input, output or de power.
Both models are powered by de power 7-42 vdc in such a
way that the output negative connection is common with the
power supply. This is why it is called the three wire transmitter.
3.0 INSTALLATION
The instrument is supplied in a general purpose compact
plastic enclosure as standard. NEMA 4 and 7 enclosure are
optionally available. Installation area/location must agree
with the supplied instruments including operating temperature
and ambient conditions.
Electrical Connections
The wire used to connect the instrument to the control
system 1/0 should be a 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 negative
of the ADTECH instrument and left floating at the sensor).
Six position compression terminals are provided for 1/0 and
power connections. A housing ground terminal is not required
due to non-metallic housing.
Controls
Multiturn fine ZERO and SPAN controls are provided to
calibrate the instrument. The multiturn controls are accessible
through the front panel and are clearly marked for ease of
use. Internal range selection controls are listed in the section
8.0 Tables and as follows.
Two 16 position rotary switches for coarse zero and span
control.
Pin Jumpers for major range; zero elevation and output
selection.
4.0 MAINTENANCE
These instruments are electronic and require no maintenance
except periodic cleaning and calibration verification. If the
unit appears to be mis-operating it should be checked as
installed per section 6.0 or removed for a bench check per
sections 6.0-7.0. MOST problems are traced to field wiring
and/or associated circuits. If the problem appears to be with
the instrument, proceed to 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.
�
ADTECH
COM.
NOTE: MVT306L and 326L Connections are identical.
-1-
190-A-000083
