Ion Selective Electrode for Calcium

Ca²⁺

Technical Data Sheet

Structure of the Electrode

range^*:

2.5 10^-6 to 1 mole calcium
0.1 to 40,000 mg/L calcium

The calcium selective electrode is a matrix membrane electrode with a solid contact contact. The flexible ammonia selective membrane is made from a special organic ion exchanger which is dissolved in an organic solvent and embedded into a PVC matrix.
As an organic phase the resulting "liquid membrane" is fixed by the PVC matrix and renders a stable phase boundary.
An ion selective solid state membrane forms the discharge contact for the equilibrium voltage which develops at the phase boundary.
Both the shaft and the ion selective membrane are made from PVC. This should be taken into account when using the electrode.

Ordering Information

PO No.	Type	Description
102 100	Ca	selective electrode with 1m sealed cable
102 101	Ca	selective electrode with 1m sealed cable with BNC connector
102 102	Ca	selective electrode with 1m sealed cable with DIN connector
102 005	Ca	selective electrode with indutrial threaded head
103 004	Ca	selective threaded mini electrode with BNC connector

slope of characteristic:

27 (+-)2 mV/pCa

response time in 10^-2mole,
400 mg/L calcium solution:

< 30 sec

drift within 30 minutes:

0.3 mV

drift within 24 hours:

1 mV

concentration of interfering ion species:

Mg²⁺: 3 10² times
Pb²⁺: 2 times
Zn²⁺: 1 times
Fe²⁺/ Cu²⁺: 10 times
Sr²⁺: 0.6 times
Ba²⁺: 0.5 times

pH range:

3 - 9

temperature range:

0 - 40 °C

resistance:

< 1 MOhm

sensor material:

organic ion exchanger in a special solvent, homogeneously distributed in PVC

shaft material:

plastic

dimensions:

immersion depth 120mm
diameter 12 mm