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4.0 CONFIGURATION
Range selection switch:
The unit is set to the highest range when calibrated at the factory.
To select the other ranges, slide the switch to the right. Important: Push “zero” button after
installing the Model 231RS, and after changing range.
Auto zero button:
Press and hold the “ZERO” push-button for 2 seconds to automatically
reset zero or provide contact closure on “Remote Zero, see figure 4 and figure 5. Sensors
must be vented to atmosphere.
Electrical output:
The unit is set at the factory to 4-20 mA. To select another output, move
the slide switch to the right. Push the “Zero” button after changing the electrical output mode.
Sensors must be vented to atmosphere.
Electrical connections:
Electrical termination for power supply, 3-wire voltage output and
2-wire true 4-20 mA current output, and remote zero wiring.
BAR/PSI:
Jumper selectable engineering units in Bar ranges or PSI.
A. REV/NORM:
A.REV:
Analog Reverse: When in reverse mode, the output increases when the differential
pressure decreases and decreases as pressure increases.
NORM: When in Normal mode output increases as pressure increases and decreases as
pressure decreases.
SLOW/FAST:
When Slow mode is selected, 5-second averaging is provided for surge damping.
SWAP/NORM:
Jumper selectable Port Swap feature eliminates costly re-plumbing when
incorrectly installed or replaced. Go from NORMAL to SWAP and the jumper makes the “HI”
Port “LO” and the “LO” port “HI.
High pressure electrical terminals (HI):
High pressure sensor termination.
Low pressure electrical terminals (LO):
Low pressure sensor termination.
