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3.3 Open Collector Output
The Open Collector output can be used as a switch that responds
when the process variable moves above or below a setpoint.
•
Low:
Output triggers when process variable is less than the setpoint.
The output will relax when the process variable moves above the
setpoint plus the hysteresis value.
•
High:
Output triggers when process variable is greater than the
setpoint. The output will relax when the process variable moves
below the setpoint plus the hysteresis value.
Process
Hysteresis
Low Setpoint
Output energized
Output de-energized
Process
High Setpoint
Hysteresis
VIEW menu
•
During normal operation, the ProcessPro displays the VIEW menu.
•
When using the CALIBRATE or OPTIONS menus, the ProcessPro will return to the VIEW menu if no
activity occurs for 10 minutes.
•
To select the item you want displayed, press the UP or DOWN arrow keys. The items will scroll in a
continuous loop.
•
Changing the display selection does not interrupt system operations.
•
No keycode is necessary to change display selection.
•
Output settings cannot be edited from the VIEW menu.
View Menu
Press1: 7.89 psi
Press2: 4.56 psi
Delta Pressure:
The displays below are temporary. After 10 minutes the display returns to the permanent display.
Loop 1 Output:
Loop 2 Output:
4
Time
Time
Display
Monitor Pressure 1 and Pressure 2 simultaneously.
This is the permanent view display.
Monitor the delta pressure (Channel 1 rate - channel 2 rate = Delta Pressure)
3.33 psi
This is a permanent display.
12.00 mA
Monitor the 4 to 20 mA output for Loop 1 and 2.
7.65 mA
Last CAL:
Monitor date for scheduled maintenance or date of last calibration.
02-10-09
(See description in Calibrate Menu.)
Delta Pressure (Differential Mode)
If two sensors are connected to the transmitter, the DELTA
(Sensor 1 - Sensor 2) can be assigned to output. To enable
differential mode, the selected output's "Source" selection must
be set to "DP".
For pressure and temperature transmitters ensure Sensor 1 is
equal to ID 1:
Sensor 1 - Sensor 2
Difference = 60
Example: 4-20 mA
Loop1 Source: DP
Loop1 Range: 0-120
Loop1: = 12.00 mA
Example: Output
Output1 Source: DP
Output1 Mode: Low
Output1 Setpoint: 70
Output1 = ON
Description
Sensor 1 (80)
Sensor 2 (20)
ENTER
Pres1:
4.5 psi
Pres2:
2.3 psi
Signet Pressure
Transmitter
ENTER
Signet 8450-3 Pressure Transmitter
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