11-07-2013
P-800LT Freeze Point Analyzer
4-10
Programming
Customer Alarm — When enabled, the Analyzer’s system alarm relay will be activated
whenever an external dry contact alarm signal is received. Analysis will stop and will
have to be restarted from the front panel of the instrument.
Remote Standby — When enabled, the Analyzer can be placed on-line or off-line via a
control room signal.
Stream Select — When enabled, a control room signal can be used to select Stream 1
or Stream 2 for analysis.
Validation — When enabled, a control room signal can be used to initiate a validation
measurement.
NOTE: Although the Validation Request and Stream Select contacts may be present,
these functions are only available on Analyzer’s which incorporate these options.
Screen Settings — These menu items allow you to adjust Analyzer’s LCD.
Intensity — This is a brightness adjustment.
Screen Saver — This establishes how long the screen will remain lit without any keypad
activity. Touching any of the magnetic keys re-activates the display. A value of zero
disables the screen saver.
Flush Heat — This establishes how much power should be applied when heating the detection cell
during a flush step. It should be set no higher than 50%.
Cell Heat — This establishes how much power will be applied to the heater when cell heating is required.
It should be set no higher than 50%.
CP Cool — This establishes how much power will be applied to the heater to slow cell cooling.
FP Heat — This establishes how much power should be applied to the heater to melt wax crystals once
freeze point has been detected.
Sig90 IR — This item is only active when Sig90 is selected as the sensor under Mode Settings – Detect.
It establishes sensor sensitivity.
Mode Settings — These menu items are used to set other miscellaneous operating parameters.
Standby Mode — This menu item allows you to select how the Analyzer will operate upon
application of power. When OFF is selected, the instrument will begin performing
analyses automatically when power is applied and all purge requirement met. When ON
is selected, the instrument will power up in the Off-Line mode and must be manually
placed On-Line.
Mode — This setting determines the method the Analyzer will use to detect Freeze point.
Baseline — This is the recommended for use unless problems are
encountered. It uses the delta change from the baseline average from the
end of the flush cycle to the detection of freeze point.
First Derivative — This setting may be useful for samples with high moisture
levels. This mode detects freeze point based on the first derivative rate of
change of the luminance signal and uses the rate of change.
Delayed T — This method uses a baseline based on a moving average. The
main advantage of this method is that it provides better measurement
repeatability in some applications..
CP Threshold — This is a sensitivity setting for cloud point detection. The higher the
value, the more the optical signal will have to change before cloud point is detected.
