Setra System Model 223 - Manual (Page 4)

4
4.0 CALIBRATION
The 223 transducer is factory calibrated to the specific input pressure
range vs. output voltage or current and should require no field adjust-
ment. For absolute pressure ranges, the zero can be adjusted with full
vacuum applied to the pressure port. For compound ranges, the zero
should be adjusted with the unit at atmospheric pressure and the output
adjusted as noted in Diagrams 4 & 5 on pages 5 & 6. Zero and span
adjustments can be made by turning the rotatable cover to expose the
zero and span potentiometers. Be certain to close the rotatable cover after
adjustments are made.
Current must flow in one direction only - Please observe polarity. (See
Diagram 3.) We suggest that the cable shield Drain Wire be connected
to the system’s loop circuit ground for optimum electrical noise
rejection. On transducers with an integral Bayonet connector, connec-
tion to transducer case ground can be achieved by connecting the
cable drain/shield wire to the mating cable-mounted connector shell
(see Note 1).
Note1: The transducer case and integral Bayonet Connector shell, are
electrically connected.
Note 2: ETL Listed to UL1604 Standards:The current output unit (excluding
units ordered with the Mini Din Shell) may be installed in UL1604 Class
1 Hazardous (Classified) Group A, B, C, D, Division 2 locations if the unit
is ordered for these locations. (This is denoted by an N1 designation in
the Part Number, 12th and 13th digits.) Safety barriers are not required
as long as the unit is operated under normal conditions with a
maximum excitation voltage of 30 VDC between the input terminals.
Note 3: ATEX 94/9/EC Approved: Special hazardous area instructions for 223
transducers (with the N1 suffix) with ATEX approval: The 223
transducer (with the N1 suffix) is designed for use in hazardous areas
indoor applications with ATEX rating: Non-incendive II 3G Eex nL IIC T4
X -30
°C<Ta<+80°C. (Note: Units ordered with the Mini Din Shell are not
ATEX approved for use in hazardous locations.)
• The device can only be used for “Indoor Applications”.
• Power must be turned off before connecting or disconnecting.
• For the connector version, the connector must be secured before applying
power and DO NOT SEPARATE WHEN ENERGIZED.
• The shielded cable must be used and the drain wire of the cable must be
connected to the earth ground. The drain wire of the cable must connect to
the connector metal outer shell for the connector version.
• The maximum allowable transient disturbance must not exceed more than
40% of the maximum excitation voltage.
Setra
Transducer
(4-20mA)
Power
Supply
Load
(Monitor)
+
+
_
+
_ _
Diagram 3