Setra System Model 224 - Manual (Page 6)

6
4.2 Voltage Output Span Adjustment
(Complete the zero adjustment before setting span.)
Span or full scale output adjustments should only be performed by using an
accurate pressure standard (electronic manometer, digital pressure gauge, etc.),
with at least comparable accuracy to the 224 transducer (
±0.25% FS). With full
range pressure applied to the pressure port, the span may be adjusted by
turning the span potentiometer screw. The span (full scale) output is factory set
to within
±25mV for 5 VDC FSO or ±50mV for 0 to 10 VDC FSO.
4.3 Current Output Zero Adjustment
While monitoring the current output, and with the pressure port open to
atmosphere or with zero pressure applied, the zero may be adjusted by turning
the zero potentiometer screw. The factory setting is 4mA (
±0.08mA). For absolute
pressure ranges, the zero should be adjusted with a full vacuum applied.
For compound pressure ranges, the zero should be adjusted with the unit at
atmospheric pressure and the output adjusted as noted in Diagram 6 below.
Note: When it is not possible to vent input pressure for zero adjustment (i.e., hazardous
gasses), zero may be adjusted by pulling a vacuum and setting the unit to 4.0 mA (
±0.08
mA). This method may result in a small zero setting error due to variations in barometric
pressure.
4.4 Current Output Span Adjustment
Span or full scale output adjustments should only be performed by using an
accurate pressure standard (electronic manometer, digital pressure gauge, etc.)
with at least comparable accuracy to the 224 transducer (<0.25% FS). With full
range pressure applied to the pressure port, the span may be adjusted by turning
the span potentiometer screw. The span (full scale) output is factory set to within
±0.08mA.
5.0 MODEL 224 PERFORMANCE SPECIFICATIONS
NOMINAL “INSTALLED” OUTPUT AT ATMOSPHERIC PRESSURE
PSI COMPOUND CURRENT
RANGE OUTPUT (mA)
-14.7 to 25 9.92
-14.7 to 50 7.63
-14.7 to 100 6.05
-14.7 to 250 4.89
-14.7 to 500 4.46
-14.7 to 1000 4.23
-14.7 to 3000 4.08
BAR COMPOUND CURRENT
RANGE OUTPUT (mA)
-1 to 1.7 9.92
-1 to 3.4 7.63
-1 to 7 6.00
-1 to 17 4.88
-1 to 35 4.44
-1 to 70 4.22
-1 to 200 4.07
Diagram 6
Accuracy RSS * Thermal Effects
(at constant temperature.)
±0.25% FS
Comp Range
°F(°C) +15 to +150 (-9 to +65)
Non-Linearity, BFSL
±0.15% FS
Zero Shift %FS/100
°F (50°C) ±2.0 (±1.8)
Hysteresis 0.20% FS Span Shift %FS/100
°F (50°C) ±2.0 (±1.8)
Non-Repeatability 0.02% FS Environmental Data (Temperature)
*RSS of Non-Linearity, Non-Repeatability and Hysteresis. Operating**
°F (°C)
-40 to +185 (-40 to +85)
Warm-up Shift <
±0.1% FS total
Storage
°F (°C)
-40 to +185 (-40 to +85)
Current Unit Ordered w/Option N1
Operating **
°F (°C)
-22 to +176 (-30 to +80)
Storage
°F (°C)
-22 to +176 (-30 to +80)
** Operating temperature limits of the electronics only. Pressure media temperature may
be considerably higher or lower.