Adtech PTT 373L 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 AD TECH 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 PTT 373L LOW POWER Three-Wire
PotentiometerTransmitterprovides high accuracy conversion
of 50 to 100,000 ohm potentiometer input signals to standard
1-5 v de or 0-5 vdc output.This model consumes very low
power, typically 3.5 mAdc and is specially designed for
remote battery or solar panel powered applications. The
primary features of the PTT 373L are:
• Low operating power, 3.5 mA typical.
• Zero Suppression of up to 1 00% 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 provides. Only
1 "w x 3.1 "h x 3.6"d.
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.
PTT 373L
Three-Wire Non-Isolated Potentiometer Transmitter
Instruction Manual
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
face plate, Data Bulletin or on attached supplementary
sheets.
- 1 -
be. l ow and on the instrument
ADTECH
COM.
1 90-A-000084A
(3-97)