8
Relay #3:
Relay 3 has three modes, ALARM, CA2 CLEAN, and SPECIAL.
ALARM MODE: In this mode, the relay is energized for normal operation and will become
deenergized if an error condition occurs. Consequently, loss of power can be sensed remotely as an
alarm condition.
CA2 CLEAN: This mode must be chosen if a model CA2 compressor cleaning assembly is used.
Both relays 3 and 4 are needed to operate this compressor.
SPECIAL: This mode is set if customer supplied air or water is being used with one or two solenoid
valves (see drawing IIG04R113) Or, if a CA1 compressor is being used to clean both sensors. In this
mode the analyzer will energize relay #4 for a clean duration and then de-energize #4 and energize relay
#3 for a clean duration.
Clean Mode
The jet clean system is intended to be connected to relays 4 and/or 3. The relays are connected to
drawing IIG04R113 and IIG04R112 for details.
The CLEAN SCHEDULE program parameter determines how often the jet clean cycle will occur. This
parameter can be set to values of 10 minutes to 24 hrs. Typically, a clean interval of 2 hrs works well for
aeration basins. In colder climates, condensation may form then freeze in the jet-clean tubing. To
prevent this, set the clean interval to 10 or 20 minutes. If this is set to “0” then cleaning is turned off.
The CLEAN JET TIME program parameter determines how long the jet clean cycle will last. The
CLEAN PULSE can be set to values of 1-second to 90-seconds with a 1-second resolution. Typically, a
clean pulse of 30-seconds works well for aeration basins. A clean cycle will consist of the channel 1
sensor being cleaned for the programmed clean jet time immediately followed by the channel 2 sensor
being cleaned for the programmed clean jet time. The analyzer will hold the measurement reading during
the clean cycle and the recovery period which is equal to the programmed clean jet time.
The CLEAN RECOVERY parameter determines how long the analyzer will hold the DO reading after
the cleaning jet time has expired. The default setting is 1 minute which is adequate in most applications.
However, increased recovery time may be required for applications where the sensor is in stagnant water
or dead zones.
Demand Clean
When the analyzer is in the RUN mode pressing the "ENTER" button will cause a clean cycle to begin.
Performing demand clean doesn’t affect the normal clean schedule.
Analog Output
From the SETUP menu, use the ARROW keys to select the “ANALOG OUTPUT” option, then press
the ENTER key. The ANALOG OUTPUT SETUP menu has 8 parameters for configuring these outputs.
ANALOG 1 TYPE – select either 4-20mA or 0-20mA operation for the Analog 1 output.
ANALOG 1 FULL SCALE – defines the value that will cause the Analog 1 output to go to 20mA.
ANALOG 1 MIN SCALE – defines the value that will cause the Analog 1 output to go to 0/4mA.
ANALOG 1 FAIL MODE – defines the value of the Analog 1 output during an alarm or error condition.
Choose between holding the last good reading, 0/4mA, or 20mA.
the Aysix compressor, CA-2, or a customer supplied air or water source and a shut-off valve. See
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