01
Specify the result and reporting unit
Write free chlorine or total chlorine, not just chlorine. Include the expected minimum and maximum, reporting unit and decision limit from your method or customer requirement. For example, a value reported as a substance is not automatically interchangeable with a value reported as its constituent element.
02
Compare methods before model counts
Hanna HI97701 measures free chlorine over 0.00 to 5.00 mg/L as Cl₂. For a requirement covering both free and total chlorine, the manufacturer offers HI97711 with separate reagent choices. This illustrates why a quotation must name each result and reagent code, even when instrument ranges look alike.
03
Distinguish a sensor system from a photometer
The HI98494 listed in our catalog uses pH/ORP, conductivity and optical DO sensors. Its multiparameter label does not mean it performs the chlorine photometer methods above. Match every requested parameter to a documented channel, sensor or photometric method.
04
Count tests and replacement supplies
State monthly sample tests plus blanks, quality-control checks and repeats required by the method. For photometers, list reagent codes, pack sizes, cuvettes and storage limits. For sensor systems, include the relevant caps, maintenance solutions and replacement sensors. Compare total recurring requirements rather than assuming one cost always dominates.
05
Plan verification and procurement documents
Request model-specific check standards where appropriate. Hanna HI97701-11, for example, has a certificate carrying its lot, reference values and expiry. Keep a manufacturer quality certificate, a standard certificate and a separately requested calibration service as distinct quotation items. Specify site, cable length and record-export needs.