8850-1eng 电导率表说明书(2)

GF 8850电导率表说明书

3.3Open Collector Output

The Open Collector output can be used as a switch that respondswhen the process value moves above or below a setpoint, or itcan be used to generate a pulse at a rate proportional to theprocess value.

Low:

Output triggers when process variable is less than the setpoint.The output will relax when the process variable moves above thesetpoint plus the hysteresis value.

High:

Output triggers when process variable is greater than the

setpoint. The output will relax when the process variable movesbelow the setpoint plus the hysteresis value.

Proportional Pulsing

The Open Collector output will generate a 100 mS pulse at therate defined 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 areselectable in the CALIBRATE menu.

Hysteresis

Low Setpoint

Output activeOutput inactive

Starting point

High Setpoint

endpoint

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 activityoccurs for 10 minutes.

To select a VIEW display, press the UP or DOWN arrow keys. The selections will scroll in a continuousloop.

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.

View Menu

Display

Description

Monitor the Conductivity and Temperature values from the sensor.This is the permanent display.

123.45 µS/cm+67.89 ºC

The VIEW displays below are temporary. The permanent display will return after 10 minutes

Loop Output:13.75 mALast CAL:06-30-01

Monitor the Loop Current output.Check the Last Calibration date.

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8850-1 Conductivity/Resistivity Transmitter