9
DESCRIPTION
Instrument Block Diagram
The internal reference system (reference detector) of the
HI97734
photometer
compensates for any drifts due to power fluctuations or ambient temperature changes,
providing a stable source of light for your blank (zero) measurement and sample
measurement.
LED light sources offer superior performance compared to tungsten lamps. LEDs have
a much higher luminous efficiency, providing more light while using less power. They
also produce little heat, which could otherwise affect electronic stability. LEDs are
available in a wide array of wavelengths, whereas tungsten lamps have poor blue/
violet light output.
Improved optical filters ensure greater wavelength accuracy and allow a brighter,
stronger signal to be received. The end result is higher measurement stability and less
wavelength error.
A focusing lens collects all of the light that exits the cuvette, eliminating errors from
cuvette imperfections and scratches, eliminating the need to index the cuvette.
5.5. OPTICAL SYSTEM
GENERAL OPERA
TIONS
6.1. METER VALIDATION: CAL CHECK / CALIBRATION
Validation of the
HI97734
involves verifying the concentration of the certified CAL
Check standards. The CAL Check screen guides the user step‑by‑step through the
validation process and user calibration (if necessary).
WARNING
: Do not use any solutions/standards other than the Hanna
®
CAL Check
Standards. For accurate validation and calibration results, please perform these at
room temperature (18 to 25 °C; 64.5 to 77.0 °F).
Note
: CAL Check Standards will not read the specified value in measurement mode.
Protect the CAL Check cuvettes from direct sunlight by keeping them in the original
packing. Store b5
°
C and +30
°
C (41 - 86
°
F), do not freeze.
6. GENERAL OPERATIONS
