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3.3 Relay and Open Collector Outputs
The Relay and Open Collector outputs can be used as a switch
that responds when the process value moves above or below a
setpoint, or they can be used to generate a pulsing signal with a
rate proportional to the process value.
•
Low setpoint:
Output triggers when process is less than the setpoint.
The output will relax when the process moves above the setpoint
plus the hysteresis value.
•
High setpoint:
Output triggers when process is greater than the setpoint.
The output will relax when the process moves below the setpoint
plus the hysteresis value.
Process
Hysteresis
Low Setpoint
Relay energized
Relay relaxed
Process
High Setpoint
Hysteresis
VIEW menu
•
During normal operation, the transmitter displays the VIEW menu.
•
When editing the CALIBRATE or OPTIONS menus, the transmitter will return to the VIEW menu
if no activity occurs for 10 minutes.
•
To select a VIEW display, press the UP or DOWN arrow keys. The selections will scroll in a
continuous loop.
•
Changing the VIEW display does not interrupt system operations.
•
No key code is necessary to change display selection.
•
Output settings cannot be edited from the VIEW menu.
CDTX-90 Series View Menu
123.45
The VIEW displays below are temporary. The permanent display will return after 10 minutes
Loop Output:
page 8
Time
Time
Display
Monitor the Conductivity and Temperature values from the sensor.
µ
S/cm
This is the permanent display.
+67.89 ºC
Monitor the Loop Current output.
13.75 mA
Last CAL:
Check the Last Calibration date.
06-30-01
•
Proportional Pulsing
The output will generate a 100 mS pulse at the rate defined by
settings in the CALIBRATE menu.
In the example below:
•
The output will be 0 pulses/min. when value is less than 5 µS.
•
The output will be 50 pulses/min. when value is 7.5 µS.
•
The output will be 100 when value is greater than 10 µS.
The starting point, endpoint and maximum pulse rate are
selectable in the CALIBRATE menu.
0 pulses
5
Starting point
Description
100 pulses
10
endpoint
Conductivity/Resistivity
62.50 uS/cm
25.0°C
ENTER
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