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SECTION 1 GENERAL DESCRIPTION
1.1 Instrument Description
The Hach DR/800 Series Colorimeter shown in Figure 1 is a
microprocessor-controlled, LED-sourced filter photometer
suitable for colorimetric testing in the laboratory or the field. The
instrument is precalibrated for common colorimetric
measurements and includes convenient calibration capability for
user-entered and future Hach methods. Instrument
features include:
• Test results are displayed in concentration, absorbance,
or percent transmittance.
• Automatic wavelength selection and ranging in the
preprogrammed parameters.
• Data storage and recall for datalogging in the field
or laboratory.
• Conversion of results to alternate forms for many parameters
(i.e., PO
4
, P
2
O
5
, P).
• Reagent Blank Correction and Standard Adjust features may
be used to compensate for lot-to-lot variations in reagents.
• Icon prompts displayed during testing.
• A built-in timer to monitor specific reaction times called for
in the test procedures. Appropriate times are programmed
into the calibration data for specific tests. The timer also can
be used manually by the operator independent of the
stored methods.
• IR output for RS232 interface capability allows an external
printer or computer to interface with the colorimeter.
• Entry of user-entered methods or new Hach methods.
• Error signals for procedural or instrument troubleshooting.
The colorimeter operates on battery power. The instrument holds
four AA-size alkaline dry cells (batteries supplied) that power the
instrument for at least six (6) months.
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