Hanna Instruments HI 4004 User Manual

Page 15

pH range of 4-10 . The electrode responds to free calcium
ions only. Precipitates with oxalate, carbonate, phosphate
and complexes with hydroxide, sulfate, and bicarbonate
reduce measureable calcium from solution. Using Known
Addition (section XII) with complexing reagents and pH
adjustments may permits total calcium to be measured.
Limiting the length of time of exposure to samples containing
interferences will prolong useful life of your electrode. If
sensor has been exposed to ions above recommended levels,
soaking in pure calcium solutions without ISA or HI 4004-
45 will aid recovery of function.

XIV.

XIV. Storage and Care of the HI 4004 and

Storage and Care of the HI 4004 and

HI 4104 electrodes

The HI 4004 sensor can be stored in HI 4004-45 for short
time periods. For long term storage, unscrew sensing mod-
ule from sensor handle and store dry in the shipping vial.
The model HI 4104 combination electrode can be left in
HI 4004-45 for short time periods. If the electrode will be
used frequently and needs to be ready for use, take mea-
sures to prevent evaporation of fill solution. Top off fill
solution, replace o-ring, fill hole cover on the fill hole open-
ing, and place sensor in HI 4004-45 storage and condi-
tioning solution. Store electrode upright. Prior to use, drain
electolyte chamber and refill with fresh HI 7082 fill solu-
tion.
For long term storage, the electrode should be drained,
disassembled and washed of salts with deionized water.
Wrap the ceramic junction in Parafilm® or other sealing
wrap. Unscrew the module and store dry in the shipping
vial. Refrigeration of module will extend its life. Store dis-
assembled electrode in storage box provided with electrode.

XV.

XV. Conversion tables

Conversion tables

Multiply by

Moles/L (M) Ca

to ppm Ca

(mg/L) 40080

ppm (mg/L) to M (moles/L)

2.49 X 10

-5

This manual is related to the following products:

HI 4104