Flow:
This branch accesses the settings for the proportional (fl ow) input.
Flow Units:
Select desired units (MGD, GPM, GPD, LPM, MLD, %, M
3
/H).
Flow Decimal Position:
Select desired decimal position.
Flow Full Scale:
Enter the proportional input full scale. This setting should be what a 20 mA
proportional input (AI1) signal represents.
Flow Low Alarm:
Enter low fl ow alarm trip point (if desired).
Flow Threshold:
This setting allows the user to set a value (above zero) to be treated as zero for the
proportional input (AI1) signal. In proportional (Flow Pacing) control, this would mean the output signal
(PO1) would remain at zero (4mA) until the proportional input reached this value.
Flow Filter Time:
This is an adjustable span of time over which the input signal will be continually
averaged. It is recommended to be set to at least 5 seconds.
Flow Filter K:
Used in a digital fi lter for input signals. A value of zero provides no dampening.
Optimum range is between 0.5 and 0.9.
Begin Flow Zero Cal?:
To pass by this screen, press the
button twice or press the
button when
the word “Skip” is blinking. To perform a fl ow zero cal, press
button to make the word “Begin” blink.
Then press the
button.
Flow Zero Cal:
Input a steady 4.000 mA signal to AI1. Adjust the displayed “Flow” value until it reads
zero. Then press the
button. A confi rmation screen should appear indicating that the calibration was
performed.
Begin Flow Span Cal?:
To pass by this screen, press the
button twice or press the
button when
the word “Skip” is blinking. To perform a fl ow span cal, press the
button to make the word “Begin”
blink. Then press the
button.
Flow Span Cal:
Input a steady 20.000 mA signal to AI1. Adjust the displayed “Flow” value until it reads
fl ow full scale value. Then press the
button. A confi rmation screen should appear indicating that the
calibration was performed.
NOTE: Although it is recommended (for maximum accuracy and precision) that the
fl
ow zero and span
calibrations be performed at 4 and 20 mA, they can be performed at values between 4 and 20 mA.
PO1:
This branch accesses the settings for the PID Control output signal.
PO1 Units:
Select desired units (PPD, GR/H, KG/H, GPH, GPM, GPD, %).
PO1 Decimal Position:
Select desired decimal place.
PO1 Full Scale:
Enter the desired output full scale. This is what a 20 mA output signal (selected as
PO1) will represent.
NOTE: A minimum of three integers must be used. Therefore, if the PO1 Full Scale is set below 100,
one decimal position must be used (ex: 99.9)
Gas Feed Type:
Select either “CL2” or “SO2”. These two selections are basic classifi cations of what
chemical type the PID Control program is controlling. “CL2” represents any chemical that will increase
the residual reading and “SO2” represents and chemical that will decrease the residual reading.
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