Adtech PTX 173 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.
performed to verify calibration before installation to ensure
that it matches the field requirement.
2.0 GENERAL DESCRIPTION
The ADTECH Model PTX 173 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 173 are:
• Zero Suppression of up to 100% of the potentiometer
rotation 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 terminal 1 of the ADTE CH
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.
PTX 173
Two-Wire Non-Isolated Potentiometer Transmitter
Instruction Manual
A simple check should be
- 1 -
Controls
Instrument controls consist of the following:
• Two 16 position range switches for COARSE ZERO
and SPAN control.
• 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 ® ®
LOOPl+I
®
NOTE: Intrinsically safe when connected per Installation
DWG 270-A-000003.
©
HSUPPLY
® I
1 90-A-000049-B
(3-97)