HF scientific AccUView Wastewater UV %Transmission Monitor - Manual (Page 19)

5.0 Instrument Calibration
The instrument was calibrated and tested prior to leaving the factory. Therefore, it is
possible to use the instrument directly out of the box. Under normal conditions, re-
calibration is recommended at least once every month. To get the greatest accuracy
calibration may be required once per week.
Two cuvettes and two flow through units are supplied with the instrument so that they can
be exchanged with each other. One cuvette and flow through unit should always be kept
clean for replacement when calibrating.
Relay contact is held at the last valid condition and will not change state while the
instrument is in the calibration and/or in the configuration mode. While in the calibration
mode, the instrument has a time-out feature that automatically returns the system
operation to the
AUTO mode after a fifteen (15) minute period of inactivity.
5.1 100%T Calibration
1. Select the calibration function of the instrument by pressing the
MODE/EXIT button once.
The arrow beside
CAL will be illuminated on the display. The lower display shows
alternating
100 (indicating that the 100%T standard is requested) and ↵.
2. Remove the flow through assembly by releasing the quick connect fittings then releasing the
flow through clamp. Retain this flow through unit for future cleaning and use.
3. Install the clean, dry flow through unit in which the cuvette is filled with 100%T calibration
fluid. Do not connect the quick connect fittings at this time, but lock the flow through down.
4. Press the
↵ button to accept the calibration.
5. The lower display will count down the progress of the calibration step.
6. At the end of the count, the instrument will switch to
pre-AUTO. The pump will not start in
this mode. Connect the quick connect fittings at this time.
7. Press the
↵ button once to enter AUTO and resume normal operation.
8. After the instrument has returned to
AUTO, the pump will run through a cycle.
9. Moving a flow head after calibrating will affect the accuracy of the reading.
Note: It is recommended that the flow through unit be removed for as short an interval as
possible to prevent premature saturation of the desiccant.
Warning: Even thought the UV lamp is low in power, it is still recommended to avoid
looking directly into the optical well while the flow through unit is removed.
AccUView Wastewater (1/09) 13
Rev. 2.9