4
Signet 8450-3 Pressure Transmitter
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
ENTER
Sensor 1 (80)
Sensor 2 (20)
Pres1: 4.5
psi
Pres2: 2.3
psi
ENTER
Signet Pressure
Transmitter
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.
Hysteresis
Time
Low Setpoint
Process
Output energized
Output de-energized
Hysteresis
Time
High Setpoint
Process
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
Display
Description
Press1: 7.89 psi
Press2: 4.56 psi
Monitor Pressure 1 and Pressure 2 simultaneously.
This is the permanent view display.
Delta Pressure:
3.33 psi
Monitor the delta pressure (Channel 1 rate - channel 2 rate = Delta Pressure)
This is a permanent display.
The displays below are temporary. After 10 minutes the display returns to the permanent display.
Loop 1 Output:
12.00 mA
Monitor the 4 to 20 mA output for Loop 1 and 2.
Loop 2 Output:
7.65 mA
Last CAL:
02-10-09
Monitor date for scheduled maintenance or date of last calibration.
(See description in Calibrate Menu.)
