Pressure - Seametrics CT2X Instructions For Use Manual

SETTINGS AND CALIBRATION
Aqua4Plus 2.0 will take 10 readings and display the average.
Watch for stability while Aqua4Plus 2.0 is measuring to
ensure an accurate calibration. To accept the first point
reading click Ok.
If you've selected one point calibration next click Apply
to apply the new offset value, confirm other settings as
needed, then close the calibration window.
If you've selected two point calibration place the sensor in
your second point standard and enter the RAW conductivity
value of the standard at the temperature noted above
(consult conductivity standards temperature reference
chart) and enter it in the Ref. Point box. Next click Measure.
Aqua4Plus 2.0 will take 10 readings and display the average.
Watch for stability while Aqua4Plus 2.0 is measuring to
ensure an accurate calibration. To accept the second point
reading click Ok. Your new offset and slope values will
appear to the right, confirm other settings as needed and
click Apply to confirm your new slope and offset values.
Aqua4Plus 2.0 will provide a real time reading to verify
calibration was successful.
Before closing the calibration screen make sure your
settings are correct for temperature compensation as
desired. Use the non-linear box for low conductivity natural
water applications. This will disable the Ref. Temp and Temp
Coef settings and use the nLFn function to temperature
compensate the conductivity channel. This method meets
the DIN EN 27888 standards.
For linear temperature compensation set the temperature
you'd like your conductivity corrected to in the Ref. Temp
C box, and the appropriate temperature coefficient you'd
like to use in the Temp Coef %/C box. Seametrics defaults
the conductivity to a Ref Temp of 25 and 2.1 %/Deg C for
the Temp Coef.
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TDSfctr is the multiplier applied to the conductivity readings
to provide TDS output. Seametrics defaults to 0.49, change
as necessary to fit your TDS multiplier.
Confirm any changes by clicking Apply. Once calibration
setup is complete click Close.
Pressure Calibration
To perform a calibration setup on the pressure channel
first connect to the sensor and ensure all data has been
uploaded and erased from the sensor. Next select the
calibration button (example images can be found under
conductivity calibration page 12).
Next select the calibration setup you'd like to perform:
Comfirm desired measurement units and click Continue.
Submergence:
One Point/Zero Point Calibration:
To zero pressure output to atmospheric pressure position
the sensor in air in its desired installation position (typically
vertical, if sensor will be installed horizontally position as
such during 0 point calibration). Select 1 point Calibration
under Calibration Type.
For PSIG sensors use 0 as the reference value and click
Measure.
For PSIA sensors enter current barometric pressure from
a known accurate barometer set to matching units. Enter
your reference value in the Ref. Point box and click Measure.
Page 13
CT2X INSTRUCTIONS
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