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MODEL 1054B C
6.1 GENERAL. Display Mnemonic COd. Select this fea-
ture to display the user defined security code. Any
three digit number may be used for this code. 000 will
disable the security feature. This item is used to pre-
vent accidental changes to the calibration and configu-
ration of the analyzer. When activated, the analyzer will
allow all read functions to read normally. If an attempt is
made to change a value, LOC will display followed by
the Numeric Display ready for the code to be entered.
A proper code will unlock the analyzer and the analyzer
will return to the last function attempted. Any incorrect
value will result in bAd briefly displaying. The analyzer
will then return to numeric display and await the entry
of the code. Once unlocked, the analyzer will allow
access to all functions until the analyzer is either pow-
ered down or no keystrokes are made for a period of
two (2) minutes. If the code should be forgotten, press-
ing and holding the ACCESS key for five (5) seconds
will result in display of the code. Releasing the
ACCESS key, then pressing ENTER will unlock the
analyzer.
THEORY OF OPERATION. This section is a general
description of how the analyzer operates. This section
is for those users who desire a greater understanding
of the analyzer's operation.
A square wave measurement circuit in the Model
1054B C Analyzer replaces the typical bridge circuit
used in most conductivity analyzers, resulting
improved linearity, accuracy and a broad measurement
range. The analyzer measures the absolute conductiv-
ity of the measured process. The analyzer then cor-
rects the conductivity to 25°C by accurately measuring
the process temperature by means of a PT-100 RTD
located in the conductivity sensor. The microprocessor
also adjusts the amount of correction required for tem-
perature compensation by means of a temperature
slope adjustment.
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SECTION 6.0
KEYBOARD SECURITY
SECTION 7.0
THEORY OF OPERATION
in
6.2 ACCESS CODE (COd).
1.
Enter Set Mode by pressing ACCESS key twice.
) until COd appears on the display.
2.
SCROLL (
é
3.
Press SELECT.
4.
SCROLL (
) and SHIFT (
é
desired value, then ENTER it into memory.
NOTE
Entering 000 disables the keyboard securi-
ty.
NOTE
Security feature will not activate until two
(2) minutes without keyboard activity or
power is removed from the analyzer then
restored.
The slope may be adjusted between 0-5%/°C either
manually via the keyboard or automatically during
bench or process calibration. This slope controls the
amount of correction required in the temperature com-
pensation circuit, and is specific to the process, giving
you the most accurate conductivity reading possible.
The Model 1054B C analyzer can provide conductivity
measurements as low as 1 uS/cm and as high as 1000
mS/cm full scale over a process temperature range of
0 to 200°C.
Rosemount Analytical also offers a booklet titled
Conductance Data for Commonly Used Chemicals. This
booklet includes measurement theory and conductance
information for commonly used chemicals.
SECTION 6.0
KEYBOARD SECURITY
) to display the
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