4
8850-2 Conductivity/Resistivity Transmitter
Hysteresis
Time
Low Setpoint
Process
Relay energized
Relay de-energized
Hysteresis
Time
High Setpoint
Process
3.3 Relay Output
The relays can be used as a switch that responds when the
process value moves above or below a setpoint, or to generate a
pulse at a rate proportional to the process value.
• Low:
Relay triggers when process is less than the setpoint.
The relay will de-energize when the process moves above the
setpoint plus the hysteresis value.
• High:
Relay triggers when process is greater than the setpoint.
The relay will de-energize when the process moves below the
setpoint plus the hysteresis value.
Signet
Conductivity/Resistivity
Transmitter
ENTER
62.50 uS/cm
25.0 C
VIEW menu
• During normal operation, ProcessPro displays the VIEW menu.
• When editing the CALIBRATE or OPTIONS menus, ProcessPro will return to the VIEW menu if no
activity occurs for 10 minutes.
• To select a VIEW display, press the
▲
or
▼
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.
• Proportional Pulsing
The relay will generate a 100 mS pulse at the rate de
fi
ned by
settings in the CALIBRATE menu.
In the example below:
• The output will be 0 pulses/min. when value is less than 5.
• The output will be 50 pulses/min. when value is 7.5.
• The output will be 100 when value is greater than 10.
The starting point, endpoint and maximum pulse rate are select -
able in the CALIBRATE menu.
10
5
0 pulses
Relay Output Rate:
0 to 100 Pulses/min.
endpoint
100 pulses
Starting point
Pulse rate
View Menu
Display
Description
1234.5
μ
S/cm
12.6 °C
Monitor the Conductivity and the Temperature input from the sensor.
This is the Permanent display.
All of the displays below are temporary. After 10 minutes the display returns to the permanent display.
Loop Output
14.16 mA
Monitor the 4 to 20 mA Loop output.
Last CAL:
02-10-09
Monitor date for scheduled maintenance or date of last calibration.
(See description in Calibrate Menu.)
