Setra System Model 224 - Manual (Page 4)

4
4.0 CALIBRATION
The 224 transducer is factory calibrated to the specific input pressure range vs.
output voltage or current and should require no field adjustment. 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 5 & 6 on
pages 5 & 6. Zero and span adjustments can be made by removing the zero and
span hole plugs and washers and adjusting the zero and span potentiometers.
Be certain to replace the zero and span hole plugs and washers after adjustments
are made. Hole plugs and washers are installed in potentiometer holes to keep
contaminants out of the unit.
Diagram 4
Electrical
Connection
SPAN Adjustment ZERO Adjustment
Note 1). The transducer case and integral Bayonet Connector shell, D-sub
Connector Shell, and Mini Din shell clips 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 224 transducers
(with the N1 suffix) with ATEX approval: The 224 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.
Diagram 3
Setra
Transducer
Power Load
+
+
_
+
_ _