HF scientific CLX Online Residual Chlorine Monitor - Manual (Page 17)

CLX (1/12) Page 12
REV 5.1
5.2 Security Access Feature
The instrument is equipped with a security access code feature that can be activated in the
configuration mode. If the security feature is enabled, the screen shown in the illustration
below will appear when the MODE/EXIT button is pressed.
The security code (333) must be entered to gain access to CAL or CONFIG menus.
Notice that the first number in the code is flashing. The flashing indicates that this is the
number to be changed. Use the  or  arrows to select the first of the three numbers in
the code and then press the  button to accept the first number of the code. Now enter the
second number in the code. Proceed as with the first number followed by  . Then repeat
the process for the third number in the access code, and finish with the 
button.
If the valid access code has been selected, the instrument will be directed to the calibration
mode. If the wrong access code is selected, the instrument will return to the AUTO mode.
Refer to section 7.5 Enabling the Security Access for more information.
5.3 The White LED
A white LED is used to illuminate the measurement cuvette for easy viewing of the
instrument operations. During the Zeroing portion of the cycle and the Measurement
portion of the cycle, when the green LED is active, the white LED is turned off to lower
interference. This normal operation for the instrument and does not represent an error or
problem.
The white LED is also used to draw attention to a problem as described in section 9.0
CLX Fault Detection. In these instances the white LED blinks at a constant rate dependant
on the severity of the problem, but is still turned off as described above. Please note that
any fault is always posted to message queue on the lower portion of the LCD.