Evoqua Wallace & Tiernan Depolox 3 plus, Manual

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WT.050.560.001.UA.IM.0714 46
Depolox
®
3 plus ReSIDUAl ANAlYZeR
eVoQUA W3T140188
3.1.6 Alarm Relays
Depolox® 3 plus features the following alarm relays:
• Two relays in single electronics unit.
• Four relays in dual electronics unit.
Definitions for switching the relays:
DIS max: relay reacts to the set value
DIS min: relay reacts to the set value
pH max: relay reacts to the set value
pH min: relay reacts to the set value
Fluor max: relay reacts to the set value
Fluor min: relay reacts to the set value
DI1, DI2, DI3: relay is activated as long as there is a signal on the
digital input
general fault: relay is activated as long as there is an alarm mes-
sage
dosing contact: relay is energized as long as the actual value is
below the setpoint (for relay 1 only)
Selections:
normally open (N.O.): relay is energized in case of an alarm.
fail safe (N.C.): relay is de-energized in case of an alarm
non latching: relay is de-energized as soon as the alarm
condition has ceased
latching: relay stays energized after the alarm until the
star key “

” is pressed to acknowledge the
alarm
3.1.7 Dosing Contact for Chlorine
The chlorine alarm relay 1 can be used to switch-on a pump or solenoid valve
for dosing chlorine.
The relay is energized if “AR 1 Definition” is set to “dosing contact” and
the actual value is < setpoint.
3.1.8 mA Outputs
For each sensor there is an mA current signal output (e.g., for connecting an
additional display). The range fixed at 4...20mA corresponds to the measuring
range. For example, for a Membrane range of 0 to 5 mg/l:
0 mg/l: 4 mA
5 mg/l: 20 mA