6
Signet 8250-2 Level Transmitter
5.3 Relay
Operation
Relay outputs can be used as switches that respond when the
process variables move above or below setpoints, or when the
process variables move outside of a window.
• The relays may be turned Off if not in use.
• Response can be delayed up to 6400 s ( see Calibrate menu).
Low:
Relay is energized when process variable is less than the
setpoint. The relay de-energizes when the process variable
moves above the setpoint plus the hysteresis value.
High:
Relay is energized when process variable is greater than the
setpoint. The relay de-energizes when the process variable
moves below the setpoint plus the hysteresis value.
Window:
Relay is energized when the process variable moves above or
below a
fi
xed window of values. The relay de-energizes when
the process variable moves inside the window by more than the
hysteresis value.
Note:
Relays will operate in reverse if miswired. Observe relay
logic appropriate to the application.
6. VIEW
Menu
• During normal operation, the ProcessPro displays the VIEW menu.
• To select a display, press the UP or DOWN arrow keys. The display selections 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.
• When using the CALIBRATE or OPTIONS menus, the ProcessPro will return to the VIEW menu if no key
is pressed for 10 minutes.
View Menu
Signet Level
Transmitter
Level
+10.00 ft
Relay 1
Relay 2
ENTER
Window
High Limit
Hysteresis
Hysteresis
Time
Low Limit
Process
Hysteresis
Time
Low Setpoint
Process
Relay energized
Relay de-energized
Hysteresis
Time
High Setpoint
Process
Display
Description
Level
+10.00 ft
Displays the Level value.
Permanent display when "Level" is the display selection in OPTIONS menu.
Volume
+30.00 gal
Displays the Volume value.
Permanent display when "Volume" is the display selection in OPTIONS menu.
LVL +10.00 ft
VOL +300.00 gal
Displays the Level and Volume simultaneously.
Permanent display when "Both" is the display selection in OPTIONS menu.
All of the displays below are temporary. After 10 minutes the display returns to the permanent display.
Loop Output:
12.00 mA
Monitor the 4 to 20 mA Loop output.
Relay A: On
Relay B: Off
Displays the status of Relays A and B.
Appears only when external relay module is detected.
No Relay Module
Detected
Displayed if the relay module is not detected at Sensor Con
fi
guration (see
calibrate menu)
Note: When using the 8059-4 or -4AC, only relays 1 and 2 can be utilized
with the level instrument.
Last CAL:
02-10-09
Monitor date for scheduled maintenance or date of last calibration.
(See description in Calibrate Menu.)
