Watertight Corrosion-Resistant Case; Solution Temperature Compensation - Honeywell 9782 Series Operator's Manual

Conductivity/Resistivity Analyzer/Controller

Watertight corrosion-resistant case

The 9782 is enclosed in a watertight and corrosion resistant industrial case, designed for panel,
pipe or wall mounting. It has an EMI/RFI shielded plastic case.

Solution Temperature Compensation

There are two types of 9782C Analyzer/Controller models: standard range and wide range. Both
types provide temperature compensation as described below. The standard range
Analyzer/Controller is ideal for high-purity water applications. The wide range
Analyzer/Controller is suitable for chemical solutions.
To take advantage of the temperature compensation capabilities, the appropriate solution
temperature compensation type must be entered for each cell as described in Section 5.
Standard Range - A standard range 9782 Analyzer/Controller provides true high purity
temperature compensation for deionized water as well as for routine applications. The
Analyzer/Controller also employs unique compensation algorithms for the highest accuracy in
power industry water treatment using ammonia or morpholine, as well as for cation conductivity
samples. Semiconductor resistivity measurements on acid etch rinse operations, especially with
hot deionized water, also achieve the highest available accuracy. For pharmaceutical
applications, raw conductivity data is available at the touch of a button.
For high-purity water special temperature compensation is required in the range of 0.055 to 5
microsiemens/cm per 0.2 to 18 Megohms-cm. Traditional compensation techniques used in most
analog instruments require temperature compensator selection for a reference conductivity
represented by a single curve. This method lacks the capability to accurately reflect the changing
temperature coefficient of water for variations in temperature and conductivity on either side of
that reference value. Advanced high-purity water temperature compensation determines the
conductivity of an impurity at any concentration of water at any temperature, and the interaction
between the two. It compensates these values to obtain the conductivity referenced to 25 C.
Because the temperature coefficients involved are both high and variable, a precise temperature
measurement is required to achieve accurate compensation. To accomplish this the 9782
Analyzer/Controller first makes precise temperature measurements over a wide range, even with
long sensor leads. Second, an accurate conductivity measurement is assured by use of the cell
constant trim factor. Third, internal high resolution algorithms are used to make exact high-
purity water calculations. This high level of performance in an inexpensive, yet highly reliable
instrument is the result of over seventy years of experience in making industrial conductivity
measurements.
For power plant cation/ammonia conductivity measurements temperature compensation provides
the highest accuracy for measurements of cation exchanger effluent and acidic cation
conductivity samples with Larson Lane-type analyzers.
This compensation matches both strong inorganic and weak organic acid temperature
characteristics. Measurements of steam and condensate samples containing ammonia are also
greatly improved using this algorithm.
For power plant morphonline conductivity measurements temperature compensation was
developed specifically for this market's water chemistry. Morpholine has unique temperature
characteristics that are handled automatically by the 9782 Analyzer/Controller.
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