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Remove protective teat and connector cover
Ensure 'O' ring is in place below cap.
Shake electrode to ensure bulb is full of liquid.
Calibration
Calibrate with pH buffer or redox solutions
as appropriate.
Cleaning
If necessary, degrease with isopropanol,
or remove lime scale with 0.1M HCl.
Storage
Store in teat. Ensure teat contains buffer solution or
water and check regularly
Rejuvenation
Stand electrode in 0.1M HCl for 12 hours.
Caution. Check cap and connector
are clean and dry. Unless cap
and connector are clean and
dry, poor system performance
will result. Screw cap in by hand
only. DO NOT use spanners.
Fault analysis
Listed below are some common
symptoms of electrode
malfunction together with
possible cures:
Short scaling (Low Slope) or
sluggish response:
1
Degrease the membrane with an organic
solvent e.g. isopropanol.
2
Soak in 0.1M HCl overnight to remove scaling.
3
If measurements in samples containing protein
are being made, digest the protein deposit with
pepsin in 0.1M HCl.
Erratic readings, i.e. meter indicator swings rapidly
from one end to the other:
1
Verify sensor wiring is properly connected.
No response to buffer solution:
1
Verify sensor wiring is properly connected.
2
Check that membrane is not broken or cracked.
Unstable readings:
1
Verify sensor wiring is properly connected.
2
Contaminated glass membrane or poisoned metal
surface. Clean as described under respective
rejuvenation section.
3
A dry junction or one covered by KCl crystal may
cause drift.
Stable incorrect readings:
1
Change buffer solution.
2
Check that the membrane is not broken.
3
Ensure manual temperature setting is correct or
verify automatic compensation is used.
ABB Limited
Measurement & Analytics
Oldends Lane, Stonehouse
Gloucestershire GL10 3TA
UK
Tel: +44 (0)1453 826 661
Fax: +44 (0)1453 829 671
Email: instrumentation@gb.abb.com
abb.com/measurement
We reserve the right to make technical changes or modify the
contents of this document without prior notice. With regard to
purchase orders, the agreed particulars shall prevail. ABB does
not accept any responsibility whatsoever for potential errors or
possible lack of information in this document.
We reserve all rights in this document and in the subject matter
and illustrations contained therein. Any reproduction, disclosure
to third parties or utilization of its contents – in whole or in
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© ABB, 2018
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