Setra System Model 256 - Manual (Page 7)

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 (
±.08mA).
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 gage, etc.)
with at least comparable accuracy to the 256 transducer. With full range
pressure applied to the pressure port, the span may be adjusted by turning the
span potentiometer screw. The factory setting is 20mA (
±.16mA).
5.0 MODEL 256 PERFORMANCE SPECIFICATIONS
For Ranges For Ranges
25 PSI and Higher Less Than 25 PSI
Accuracy RSS * (at constant temperature.)
±.13% FS ±0.25% FS
Non-Linearity, BFSL
±0.1% FS ±0.22% FS
Hysteresis 0.08% FS 0.10% FS
Non-Repeatability 0.02% FS 0.05% FS
*RSS of Non-Linearity, Non-Repeatability and Hysteresis.
Thermal Effects
Compensated Range
°F(°C)
-4 to +176 (-20 to +80) -4 to +176 (-20 to +80)
Zero Shift %FS/100
°F (50°C) ±1.0 (±0.9) ±2.0 (±1.8)
Span Shift %FS/100
°F (50°C) ±1.5 (±1.4) ±1.5 (±1.3)
Warm-up Shift
±0.1% FS total ±0.1% FS total
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