Voltage Output Zero Adjustment; Voltage Output Span Adjustment; Current Output Zero Adjustment; Current Output Span Adjustment - Setra Systems 230 Installation Manual

Optimal results will be achieved by using the factory calibrated position. The
230 position effect is as follows (pressure ports in vertical plane): ±2% per g for
±.5D, ±1D, 1D, 2D ranges. ±1% per g for all other standard ranges. There is a
negative output shift with the high pressure port facing up and a positive shift
in the output with the high pressure port facing down.

4.1 Voltage Output Zero Adjustment

While monitoring the voltage between the positive output (OUT) and
common, and with both pressure ports open to atmosphere, the zero may
be adjusted. For unidirectional pressure ranges, turn the zero adjustment
screw until a reading of 0.05 VDC (±25 mV for 0-5 VDC output or ±50 mV
for 0-10 VDC output) is achieved. For bidirec tional pressure ranges, set zero
to 2.550 VDC (±25 mV) for 0-5 VDC output or 5.050 VDC (±50 mV) for
0-10 VDC output.

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 gage,
etc.), with at least comparable accuracy to the 230 series (±0.25% full scale).
With full range pressure applied to the high pressure port (reference port
open to atmosphere), adjust span to achieve 5.050 VDC (±25 mV) or
10.050 VDC (±50 mV).
Example 1:
Example 2:

4.3 Current Output Zero Adjustment

While monitoring the current output, and with both pressure ports open to
atmosphere, the zero may be adjusted. For unidirectional pressure ranges,
turn the zero adjustment screw until a reading of 4 mA (±.08 mA) is achieved.
For bidirectional ranges, set zero to 12 mA (±.08 mA).

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 230 series (±.25% full scale).
With full range pressure applied to the high pressure port (reference port
open to atmosphere), adjust span to achieve 20 mA (±0.08 mA) output.
Example 1:
Example 2:
5
Unidirectional pressure range of 0 to 1 PSI
Apply 1 PSI, adjust span to 5.050 VDC (or 10.050 VDC)
Bidirectional pressure range of ±.5 PSI
Apply .5 PSI, adjust span to 5.050 VDC (or 10.050 VDC)
Unidirectional pressure range of 0 to 1 PSI
Apply 1 PSI, adjust span to 20 mA
Bidirectional pressure range of ± .5 PSI
Apply .5 PSI, adjust span to 20 mA