Aquameter
™
Series Instruction Manual
10401-00188 Rev M
During calibration of the DO electrode, variations due to temperature and air pressure are
automatically compensated for. During the measurement of DO, temperature, air pressure
and salinity are automatically compensated for.
During calibration of the ORP electrode, the variation in the calibration buffer solution due
to temperature is automatically corrected for. During measurement of ORP however,
temperature corrections are not applied as the correction factors are system and chemical
dependent and are not easily determined.
ORP potential measurements are mostly made to follow reactions rather than for their own
sake. The completion of an ORP reaction is normally accompanied by a sharp change in
the ORP millivolts reading. This change is usually much larger than the errors induced by
temperature side effects.
Turbidity calibration and measurements are made by the Aquaprobe using optical
techniques, which are not susceptible to the effects of temperature. Temperature
compensation is therefore not applied.
6.4. GPS Reception
The GPS version of the Aquameter (AM-200) contains a built-in GPS receiver and antenna.
The antenna is situated at the top of the case, just behind the AQUAREAD Logo.
For optimum signal reception, the antenna must be able to ‘see’ a reasonably large amount
of the sky.
The GPS receiver will not work indoors or when shielded from the sky by
any solid structure.
After switch-on, the GPS receiver will automatically start to search for satellites. During this
phase, the message
GPS:Acquiring
will be shown on the bottom line of all the screens.
As soon as three satellites are acquired, two dimensional position (no altitude) will be
calculated and the message
GPS:2D POS
will be shown on the bottom line of the screens.
Once a fourth satellite is acquired, altitude will be calculated and
GPS:3D POS
will be
shown on the bottom line of the screens. With a good view of the sky, position should be
calculated within ninety seconds of switch-on. To see your geographic position and the
number of satellites in use, use the left or right arrow keys to scroll to the Position page.
If you switch the meter on indoors, then carry it outside after several minutes, there may be
a considerable delay in acquiring satellites. In this case, switch the meter off, then back on
again to reset the acquisition process.
© 2011 Aquaread Ltd.
www.aquaread.co.uk
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