Adtech FDT 350L 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 MODEL FDT-350L LOW POWER Frequency
to DC Transmitter provides high accuracy conversion of
frequency or pulse rate inputs to standard process signal
0-5 vdc or 1-5 vdc or zero based outputs.
This model cosumes very low power typically 3.5 mAdc and
is specially designed for remote battery or solar panel
powered applications.
This instrument is powered by 7-42 vdc supply. The negative
of the power and the output share a common connection.
This is the reason it is called a three wire transmitter.
The input waveform may be sinusoidal, triangular or any
pulse shape that is periodic.
between 10 mv to 100 VRMS voltage or a dry contact rated
at 2 mA, 24 vdc. For a contact input a jumper is installed
between terminals 2 & 3.
The input is electrically isolated from the output and the
power supply by 600 volts ac or 1000 volts de peak.
Standard features include both hysteresis and sensitivity
adjustments for noise rejection; built in adaptive digital
filtering for improved contact bounce and signal noise
immunity.
ZERO, SPAN, SENSITIVITY and HYSTERESIS controls
are provided by infinite resolution potentiometers.
Recalibration to other ranges is very convenient. ZERO and
SPAN are totally independent of each other, enhancing the
calibration process.
3.0 INSTALLATION
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 terminal blocks are provided for
1/0 and power connection. A housing ground terminal is not
required due to non-metallic housing.
Controls
Instrument controls consists of the following:
FDT 350L
Isolated Frequency Transmitter
Instruction Manual
The input signal may be
-1-
• One 16 position rotary switch for Major Range.
• Four multiturn potentiometers for Zero, Span, Hysteresis
and Sensitivity.
• One 2 position jumper for Output Zero Type.
• Two 4 position jumpers for Output Type.
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 and 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.
r
I
I
,;;,,
SPAN
ZERO
HYST.
sa<s.
ADTECH
COM.
NOTE: For contact input install jumper from terminals 2 to 3.
-
INPUT
+ -- ADD JUMPER
FOR CONTACT
INPUT
190-A-000082