Hanna Instruments HI 95771C - Manuals

6 PRINCIPLE OF OPERATION Precision is how closely repeated measurements agree with each other. Precisionis usually expressed as standard deviation (SD).Accuracy is defined as the nearness of a testresult to the true value.Although good precision suggests goodaccuracy, precise results can be inaccura...

8 1) Liquid Crystal Display2) Cuvet Holder3) Cuvet alignment indicator4) ON/OFF key5) ZERO/SET key6) READ/TIMER key7) CAL CHECK key FUNCTIONAL DESCRIPTION KEYPAD DESCRIPTION• ON/OFF: to turn the meter on and off.• ZERO/SET: this is a bi-functional key: press to zero the meter prior to measurement, o...

9 DISPLAY ELEMENTS DESCRIPTION 1) four digit main display area.2) CAL: appears when the instrument operates in the calibration mode. 3) the Month and Day icons appear above the number of month and day when a date is displayed. 4) the blinking “Battery” icon appears when the battery voltage is gettin...

11 ERROR MESSAGES a) on zero reading This indicates that the zeroing procedure failed due to a low signal-to-noise ratio. In this case press ZERO again. “No Light”: the instrument cannot adjust the light level. Please check that the sample does not contain any debris. “Light Low”: there is not enoug...

12 The instructions listed below should be carefully followed during testing to ensure best accuracy. • For a correct filling of the cuvet: the liquid in the cuvet forms a convexity on the top; the bottom ofthis convexity must be at the same level of the 10 mL mark. • Proper use of the powder reagen...