Setra System Model 231 - Manual (Page 10)

10
A B C D
MS1 50 25 10 5
MS2 100 50 20 10
MS3 250 125 50 25
A B C D
RANGES
ZERO
OUTPUT
A B C D
4-20 0-5 0-10 1-5
A B C D
BAR
A.REV
SLOW
BI-DIR
SWAP PSI
NORM
FAST
UNI-DIR
NORM
REMOTE ZERO 4-20 MA
+ -
+ - +
EXC. COM OUT
Electrical Connections
Range Selection Switch Auto Zero Button Electrical Output Configurator
5.0 OPERATION
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 231, 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,
pg. 8, and figure 5, pg. 9 .
Electrical Output: The unit is set at the factory to 4-20 mA. To select another
output, move the slide switch to the right.
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 pessure 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.
BI-DIR/UNI-DIR: Select UNI-Directional or BI-Directional mode.
Unidirectional mode measures from 0 to full scale differential pressure.
Bidirectional mode measures pressure from minus 1/2 of full scale to plus 1/2 of
full scale differential pressure. Output will read 1/2 full scale when differential
pressure is zero.
SWAP/NORM: Jumper selectable Port Swap feature eliminates costly replumbing
when incorrectly installed or replaced. Go from NORMAL to SWAP and the jumper
makes the “HI” Port “LO” and the “LO” port “HI.
Figure 6