Setra System Model 205-2 - Manual (Page 2)

INSTALLATION INSTRUCTIONS FOR MULTIPLE HOOK UP OF A 4-WIRE SETRA PRESSURE TRANS-
Option #1
Uses a single, ground referenced power sup-
ply for excitation and separate, isolated, (not
ground referenced), readout or "differential
input" to a data acquisition system for each
pressure transducer output.
Option #3
Uses a single, ground referenced power supply
for excitation and either a single, isolated
readout
with a bipolar switch that "breaks before
makes"
both the + output and - output of each pres-
sure transducer, or a single data acquisition
system with
a multiplexer (MUX).
NOTE: The shield is internally commoned to
the
PS - Power Supply (Nominal 24 VDC)
PT - Pressure Transducer (4 Wire Circuit)
DVM/DAS - Digital Volt Meter or Data Acquisition
Option#2
Uses a separate, isolated power supply for
each pressure transducer's excitation and a
single, ground referenced readout or "single-
ended input" to a data acquisition system for
output circuit to cause output oscillation. If encountered, this oscillation may be eliminated by con-
necting a 100 ohm resistor (1/8 watt or larger) in series in each of the output leads at the end of the
2 foot transducer cable. These series resistors, of course, add to the output resistance.
CAUTION: Excitation power, or voltage in excess of 15 VDC, inadvertently applied to the output
leads may damage the electrical circuit. Care must be taken when installing this transducer that
the excitation voltage is not applied to the output leads by mistake. Shielding or other precaution
should be provided to assure that transient voltages in excess of 15 VDC are not applied to the
output leads.
ADJUSTMENTS (with cover removed)
CAUTION: TURN OFF EXCITATION POWER DURING COVER REMOVAL OR REPLACEMENT.
ZERO PRESSURE OUTPUT
Unit factory adjusted to within ± 50 mV. Can be adjusted by the air trim capacitor as shown in the
diagram. Any adjustments will begin to change sensitivity.
SENSITIVITY
Can be adjusted by potentiometer as shown on diagram. Unit factory adjusted to order specifica-
tions.
OTHER ADJUSTMENT
Adjusted at factory. Touching any adjustments other than zero output or sensitivity may necessi-