EUTECH INSTRUMENTS ALPHA COND 500 - REV 4 Specifications download pdf (Page 45)

Transmitter Cond/Res 2-Channel M300 45

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10.3 Mode

(PATH: MENU/PID Setup/Mode)

This menu contains the selection of control modes using relays or analog outputs. Press

[ENTER].

10.3.1 PID Mode

This menu assigns a relay or analog output for PID control action as well as details of their

operation. Based on the control device being used, select one of the following three paragraphs

for use with solenoid valve, pulse input metering pump or analog control.

Pulse Length – If using a solenoid valve, select “Relays” and “PL”, Pulse Length. Choose the

ﬁrst relay position as #1 if controlling a concentrating reagent feed. Choose the second relay

position as #2 if controlling dilution

water. Set the pulse length (feed cycle time) in seconds. A short pulse length will provide more

uniform feed. A longer pulse length will reduce wear on the solenoid valve. A value of 30 sec-

onds may be a good starting point. The % “on” time in the cycle is proportional to the control

output.

Pulse Frequency – If using a pulse input metering pump, select “Relays” and “PF”, Pulse

Frequency. Choose the ﬁrst relay position as #3 if controlling a concentrating chemical feed.

Choose the second relay position as #4 if controlling dilution water. Set the pulse frequency to

the maximum frequency allowed for the particular pump being used, typically 60 to100 pulses/

minute. Control action will produce this frequency at 100% output.

CAUTION: Setting the Pulse Frequency too high may cause the pump to overheat.

Analog – If using Analog control, change “Relays” to “Analogout” using up/down arrow keys.

Choose the ﬁrst Analogout position as #1 if controlling a concentrating chemical feed. Choose

the second Analogout position as #2 if controlling dilution water feed. Select the analog output

current range required by the control device, 4–20 or 0–20 mA. Press [ENTER].

10.4 Tune Parameters

(PATH: MENU/PID Setup/Tune Parameters)

This menu assigns control to a measurement and sets the setpoint, tuning parameters and

non-linear functions of the controller through a series of screens.

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EUTECH INSTRUMENTS ALPHA COND 500 - REV 4 Specifications Page 45