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SOLUTION COMPENSATION
The instrument is provided with a solution compensation
function which can be enabled through setup menu (setup
item S .00) . This function is a compensation curve (actually
a line) defined through 2 couples of pH and temperature
values:
• point #1:
• point #2:
The only restriction on the values of pH and temperatures
is |T
-T
|
1.0°C .
U
1
2
When the solution compensation is enabled, the pH read-
ing will be equal to:
pH (with solution compensation) = pH (without solution
compensation) + [(pH
pH
)/(T
-T
) x (T-T
2
1
2
where T is the current temperature reading (Celsius degree
units) .
With this kind of compensation formula, the pH value with
solution compensation will be the same (i .e . (pH
(T
-T
) x (25-T
) + pH
1
2
2
This solution compensation feature is useful, for example,
in the following case:
HI504 is measuring pH=pH
taken out and carried in the laboratory room to be checked
with a reference pH-meter; in the meantime the temperature
decreases to T
and also the pH value measured with the
2
reference pH-meter changes to pH
properties of the solution); if the same solution compensa-
tion formula is applied in both HI504 and the reference
pH-meter, they will read the same value .
To enable the solution compensation, set the S .00 item in
the setup menu to "ON" .
The solution compensation is disabled in any case when
calibrating pH .
pH
, T
1
1
pH
, T
2
2
-pH
)/(T
-T
1
2
1
2
) + pH
]
2
2
) at point #1 and point #2 .
2
at temperature T
1
) x (25-T
) + pH
] - [(pH
2
2
; a sample is
1
(due to the chemical
2
-
1
-pH
)/
1
2
83
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