emaux CTRL2-5L, Инструкция по эксплуатации и техническому обслуживанию

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18.0 – ELECTRODE CLEANING AND MAINTENANCE
The formation of deposits on the electrode will produce erroneous readings. The necessary cleaning action
depends on the type of deposit under consideration. In case of thin deposits, shake the electrode or use a
spray of distilled water. Organic residues or parti cularly resistant deposits should be removed by chemical
means. Mechanical cleaning of the bulb should be resorted to only in extreme cases, but bear in mind that
abrasion can lead to irreparable damage. If cleaning does not fully re-establish the efficacy of the electrode, it
may be that the electrode has aged. Ageing will show itself in the for of either a measurement error or a slow
response.
RECONDITIONING
The following chemical treatments may be carried out with a view to reconditioning the electrode. We list them
in order of increasing aggressiveness a s far as the bulb is concerned and would ask you to note that they will
not necessarily improve the electrode quality, which in some cases may even be further reduced.
1) Immerse the tip of the electrode in 0.1N hydrochloric acid (HCl) for 15 seconds, then rinse with water and
dip again the electrode in a 0.1N solution of sodium hydroxide (NaOH) for 15 seconds, followed by a second
rinsing. Repeat this sequence three times, and then carry out another check measurement. If the reading
remains erroneous, proceed to treatment 2.
2) Immerse the tip of the electrode in a 20% soluti on of ammonium bifluoride (NH2F-HF) for two or three
minutes, then rinse with water and make another check measurement. If the reading is still unacceptabl e,
proceed to treatment 3.
3) Immerse the tip of the electrode in 5% hydrofluoric acid (HF) for 10 seconds, then rinse thoroughly in water
and very quickly in 5N hydrochloric acid (HCl), followed by a second rinsing in water. If the check
measurement still produces unacceptable measurements, it only remains to change the electrode.
17.1 - ELECTRODE HOLDERS
Different types of electrode holders are available: for immersion, electrode cell, and in-line. It is essential to
bear in mind that the distance between the injection point and the electrode must never be less than one
meter. When this is not possible, an appropriate chemical mixer must be inserted between the injection point
and the electrode.
EMAUX ELECTRODE HOLDERS FOR CTRL2-7L APPLICATIONS
ECELL1 ECELL 4
ELINE 1 / ELINE 1-A ELINE 2 ESUB
Part no.
Model
SPS0000901 ECELL1: Off-line holder 1 electrode, earth , external valve for incoming flow control
SPS0001201 ECELL4: Off-line electrode and temperature probe holder, with Proximity switch
2143002 ESUB 0,5 m submersible holder, PVC body, length 50 cm
2143003 / 2143004 ESUB 1 m / 1,5 m: submersible holder, PVC body, length 100 cm / 150 cm
2143001 ELINE1 (PVC) In-line holder, PVC, pg3,5 1/2”
DPS0001601 ELINE1-A (AISI) In-line holder, AISI 316L, pg3,5 1/2”
1PRS005 ELINE2 (PP) In-line holder, pg3,5 1/2”