Figure 14–9: Salt bridge Ag/AgCl reference electrode, assembled (bottom) and
disassembled (top)
sb REF swivel (700001956)
sb REF Ag/AgCl electrode (700002254)
sb REF silicon O-ring small (700002175
a
)
sb REF body (700001957)
sb REF silicon O-ring large (700002175
a
)
sb REF sealing cap
a. 700002175 contains one small and one large O-ring.
The yellow cap prevents drying out of the cotton frit that is mounted in the tip of the body.
14.4.7 Salt bridge Ag/AgCl reference electrode check
For proper functioning, the salt bridge reference electrode should have crystals inside the body
(to ensure a saturated solution), no air bubbles inside the body, and a permeable wet cotton frit in
the body tip.
Visually inspect for the presence of crystals inside the REF
After prolonged use the salt bridge in the REF body will no longer be saturated, which usually
leads to poor reproducibility in electrochemical detection. If the salt bridge is not saturated and
the KCl concentration decreases:
December 16, 2021, 715007395 Ver. 00
Page 116
