Hach-Lange HACH 5500 sc SiO2 Operations - Manual (Page 15)

Table 2 Analyzer data (continued)
Element Definition
AIR PRESS Reagent air pressure in the reagent bottles (ideally
3.95 to 4.10 psi)
LED DUTY CYCLE Depends on condition of colorimeter cell and age of
analyzer (typically 7,200 to 40,000 counts)
HEATER DUTY
CYCLE Percentage of time the colorimeter heater is on to
maintain a constant 50 °C (122 °F)
SAMPLE FLOW Approximate sample flow into the colorimeter,
measured during the flush cycle
SAMPLE PRESS 1 Sample pressure before the pre-heater block (ideally
2 to 4.5 psi depending on incoming sample pressure)
SAMPLE PRESS 2 Differential pressure measured across the sample pre-
heater during a colorimeter cell flush. Slightly less than
SAMPLE PRESS1 during the flush cycle and zero when
the flush is off.
REAGENT 1 Level of reagent remaining
REAGENT 2 Level of reagent remaining
REAGENT 3 Level of reagent remaining
STD SOLUTION Level of standard solution remaining
FAN SPEED The speed of the ventilation fan.
LEAK COUNTS Indication of possible fluid leaks (range 0 to 1023). A
count of over 511 indicates a fluid leak
Table 3 Measurement data
Element Definition
LAST MEAS CHANNEL Last channel measured.
LAST MEAS TIME Time of last measurement.
LAST ABS Last absorbance reading.
LAST CONC Concentration of last measurement.
Table 3 Measurement data (continued)
Element Definition
NEXT MEAS TIME Time the next measurement will be taken.
DARK Number of A/D counts measured when the LED is
turned off.
REF Reference A/D count used to compensate for natural
color and turbidity.
SAMPLE A/D counts measurement (after color development)
used to determine the concentration of the sample.
DARK STD DEV Standard deviation of dark counts out of 6 readings.
REF STD DEV Standard deviation of reference counts out of
6 readings.
SAMPLE STD DEV Standard deviation of sample counts out of 6 readings.
SAMPLE VOLUME Total sample flush volume through the colorimeter for
the measurement cycle.
REAGENT 1 Calculated reagent delivery time to the sample based
on temperature, pressure and viscosity.
REAGENT 2 Calculated reagent delivery time to the sample based
on temperature, pressure and viscosity.
REAGENT 3 Calculated reagent delivery time to the sample based
on temperature, pressure and viscosity.
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