Meriam M1500 Digital Pressure Transmitter - Manual (Page 15)

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Examples:
1. Digital Output 1 is set up as shown in Meriam Setup Utility.
Output action = Closed
Comparison type = Between
Lower Value = 0.4000 PSI
Upper Value = 3.5000 PSI
Reset Deadband = 0.0750 PSI
As the pressure increases from 0 PSI the switch will remain open until the pressure reaches the Lower Value
setpoint (0.4 PSI) at which point it will close. As the pressure continues to rise the switch will remain closed
until the pressure reaches the Upper Value setpoint plus the Reset Deadband (3.5 + 0.075 = 3.575 PSI) at
which point it will open.
Now the pressure begins to decrease. The switch will remain open until the pressure reaches the Upper
Value setpoint (3.5 PSI) at which point it will close. As the pressure continues to decrease the switch will
remain closed until the pressure reaches the Lower Value setpoint minus the Reset Deadband (0.4 - 0.075 =
0.325 PSI) at which point it will open.
2. Digital Output 2 is set up as shown in Meriam Setup Utility.
Output action = Open
Comparison type = Greater Than
Value = 0.4000 PSI
Reset Deadband = 0.0750 PSI
As the pressure increases from 0 PSI the switch will remain closed until the pressure reaches the Value
setpoint (0.4 PSI) at which point it will open. As the pressure continues to rise the switch will continue to
remain open since the comparison says the pressure must be Greater Than the Value setpoint for the output
action to occur.
Now the pressure begins to decrease. The switch will remain open until the pressure reaches the Value
setpoint minus the Reset Deadband (0.4 - 0.075 = 0.325 PSI) at which point it will close.