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Dissolved Oxygen Controller Operation
Teledyne Analytical Instruments 35
The configuration password is rarely used and the configuration
settings are more sensitive, so the password should use more digits than
the operational password. With eight base 4 digits the odds of breaking
the code in three tries are 3 in 65536 if the user knows that there are 8
digits. The user will not know the number of digits that you chose, so
the odds are usually smaller than that. The maximum number of digits
allowed in a password, or the number actually used, cannot be
determined by entering trial passwords. A two or three digit password is
therefore moderately effective if systematic attempts at breaking the
code are not anticipated, but short passwords should nevertheless be
avoided in a critical process.
3.3.2 4-20 mA Output Assignments
The next group of displays are used to assign the 4-20 mA outputs.
Note: The LXT-220 has been configured at the factory for your
specific application as specified at the time of the order.
Using the MENU SELECT ▲/▼ keys, scroll down to the 4-20 mA
ASSIGN option and select it by pressing both CALIBRATE ◄/ ► keys
simultaneously. The screen will display 4-20 1: where . . . is one of the
following selections:
missing
not installed
unused
Installed but not currently used
ch1 PV
Channel 1 process value
ch1 temp
Channel 1 temperature
ch1 PID
Channel 1 PID controller output
ch2 PV
Channel 2 process value
ch2 temp
Channel 2 temperature
ch2 PID
Channel 2 PID controller output
The channel 2 options are only shown on two channel instruments,
and specialized instruments may show additional options.
To change the output assignment, first push both CALIBRATE ◄/
► keys, causing the cursor to move to the right. Then use the right-side
CALIBRATE ▲/▼ keys to scroll through the list of options. The list is