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GENERAL
The Eco Sensors A-22 is a general purpose ozone sensor and monitor. It is designed for rugged
indoor use, factories, pilot plants, process facilities and general sensor and monitoring uses. It
uses the same precalibrated sensor modules as our OS-4 permanent monitor and controller. The
internal signal processing is done by digital microprocessors. The A-22 automatically selects the
.030-1.999 or 2.00-20.00 ppm range as required. Its outputs are USB, 4-20 mA, 0-2 VDC and a
digital display that can be back lighted. The plug-in replaceable sensors are precalibrated. The
user can select continuous reading, or the maximum, average or minimum over a period of time.
The hard rubber outer case helps protect the instrument from mechanical shocks. It has a tilt
stand which can also be reconfigured to a hanging hook.
The instrument can be powered by its internal rechargeable batteries or by its AC
charger/adapter.
Do not open or service the instrument or replace the sensor module when the instrument
is turned on. This will damage the sensor calibration memory and possibly other circuits
in the instrument.
The instrument is conditionally warranted for one year. Save a copy of your purchase document
as a proof of purchase and date, and read the warranty statement at the end of this manual.
OPERATION
First, verify that the instrument is working as received. Turn the function switch to on. Digits
should appear on the display and assuming no ozone is present, should stabilize at 0.000. If the
display does not activate, the batteries may have discharged during shipping and storage.
Charge the batteries by rotating the control to the off position. Plug in an AC adapter/charger to
the jack located on the right side of the instrument, and charge overnight.
In order to burn off any chemicals that the sensor may have absorbed during shipping and
storage, you should let the A-22 run with power on and the sensor module connected for 1 hour
before response testing or overnight before the first use on site.
After the instrument has warmed up, you can read the
output with the range of .030-1.999 or 2.00-20.00
automatically selected by the A-22. The output will
also appear as RS-232 at the USB port, 0-2 V for
data logging and 4-20 mA for PLCs.
To read maximum, minimum or average of a data
stream, first turn the control to Reset for a few
seconds until the display reads 0.000. Then, turning
the control switch to Max,Avg or Min will give
corresponding readouts of the data stream maximum value, average value or minimum value
since the instrument was reset. Turning the control to Reset again destroys all previous data.
Maximum, average and minimum data are not stored in memory or outputted from the instrument.
