72Total Hardness HR
• Press TIMER and the display will show the countdown prior to the
measurement or, alternatively, wait for 2 minutes and press READ
DIRECT. In both cases "SIP" will blink during measurement.
• The instrument directly displays the total hardness in mg/L of
CaCO
3
, on the Liquid Crystal Display.
• The conversion factors to convert readings in mg/L to French
Degrees (FD), German Degrees (DD) and English Degrees (ED) of
hardness are as follows:
1 mg/L= 0.1 FD = 0.0556 DD = 0.07 ED
INTERFERENCES
Interference may be caused by excessive amounts of heavy metals.
Note: if the sample is very acidic, some extra drops of HI 93735B
Buffer reagent may be added.
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