Adtech PTX 273 Instruction Manual

1.0 INTRODUCTION
These instructions refer to the above models. Supplementary
sheets are attached i f the un i t 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.
performed to verify calibration before installation to ensure
that it matches the field requirement.
2.0 GENERAL DESCRIPTION
The ADTECH Model PTX 273 Two-Wire Potentiometer
Transmitter provides high accuracy conversion of 50 to
100,000 ohm potentiometer input signals to a standard 4-20
ma de process signal.
The primary features of the PTX 273 are:
• Zero Suppression of up to 100% of the potentiometer
rotation with a 16 position switch.
• Field adjustable via rotary switches and 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
x3.6"d.
• Options for NEMA housings, SNAP TRACK
surface mounting.
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 terminal 1
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.
PTX 273
Two-Wire Non-Isolated Potentiometer Transmitter
Instruction Manual
A simple check should be
and
-1-
Controls
Instrument controls consist of the following:
• Two 16 position range switches for COARSE ZERO
and COARSE SPAN control.
• Two multiturn potentiometers; FINE ZERO and FINE
SPAN controls, accessible on the front.
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.
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ADTECH
PTX273
lWOWlRE
TRANSMTR
(3-97) 190-A-000072-A