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Operating instructions for pH-electrodes InPro
1.
Introduction
The METTLER TOLEDO InPro
pressurised liquid electrolyte and a reference electrolyte together with a silver ions barrier. Please read through these operating instructions carefully be-
fore commissioning, in order to ensure trouble-free use. We recommend that you only operate the electrode in conjunction with original parts from
METTLER TOLEDO. Operation and maintenance should be carried out only by trained personnel and staff who have read and understood the operating in-
structions.
2.
Safety instructions
When cleaning or calibrating the electrode using solutions containing acids or alkalis both protective spectacles and protective gloves should be worn.
Do not touch the electrode at the plug-in contacts, since electrostatic discharges can damage the electronics.
3.
Product description
The inscription on each electrode contains the following information:
METTLER TOLEDO
InPro
®
325X i / SG / yyy / zzz / ISM
combination pH
pH 0 ...14 (InPro 3250), pH 0 ...12 (InPro 3253)
pH 1...11 (InPro 3251, InPro 3252)
0...100 °C (up to 140 °C InPro 3250, InPro 3253)
–25 ... 80 °C (InPro 3251), 0...80 °C (InPro 3252)
Order No. 52 00X XXX
II 1/2G EEx ia IIC T6 / T5 / T4 / T3
SNCH 00 ATEX 3130 X
IS / I, II, III/1 / ABCDEFG / T6
Observe the operating instructions
In addition each electrode is provided with a serial number on the red part of the plug-in head in order to enable identification.
4.
Installation and commissioning
1.
While unpacking check the electrode for mechanical damage. Please report any damage immediately to your METTLER TOLEDO supplier.
2.
Remove the protective cap and rinse the electrode for a short time with deionised water. Carefully remove the silicon protection from the diaphragm
with the aid of the knife supplied (cf. green instruction images on the packaging). If the electrode has already been used the sensitive part can be
cleaned if necessary with a soft toothbrush and a mild soap solution, and then rinsed for a short time with deionised water. After rinsing the electrode
should only be dabbed. Any rubbing of the pH-sensitive glass can increase the response time as a result of electrostatic charge accumulation.
3.
Check the space behind the pH sensitive glass for air bubbles and remove any air bubbles that may be present by shaking the electrode lightly in a
vertical direction.
4.
Place the electrode into the armature as described in the instructions for the armature.
5.
Connect the electrode and the pH transmitter with the corresponding cable (VP6, VP8, AK9). Observe the connections scheme that accompanies the
cable or the transmitter.
6.
Intelligent ISM sensors such as InPro 325X (ISM) and InPro 325X i enable «plug and measure» and extended diagnostics. Operation of the electrodes
in the ISM mode requires the M 700 transmitter as well as an ISM pH-module (2700 i X). For installation, commissioning and operation of the ISM
system please observe the instructions for the transmitter, module and cable.
5.
Operation: Calibration of the electrode and pH transmitter
Before a calibration immerse the electrode for 10 minutes in a pH 7.00 or pH 4.01 buffer solution whilst connecting it to the transmitter. A 2-point cali-
bration is recommended, e.g. pH 7.00 and pH 4.01 buffer solutions. For further details please consult the operating instructions for the pH transmitter.
6.
Maintenance
1.
After each working cycle the electrode tip and diaphragm(s) are to be carefully rinsed with deionised water. Any drying out of residues from the solu-
tion being measured on these parts must be avoided at all costs!
2.
If the electrode is not in use it is stored with the electrode tip and the diaphragm immersed in a tank of electrolyte (9823/3M KCl or 9848 Friscolyt).
3.
If the electrode is stored in its armature the rules described under Item 2 apply, although the electrolyte has to be slightly modified for storage purpos-
es (2 parts of buffer solution pH 9.2 to 10 parts of electrolyte) in order to avoid any corrosion of the armature parts.
4.
If an electrode is inadvertently stored in a dry condition for several days it must be rinsed for several hours in a standard storage electrolyte.
5.
The plug-in head should occasionally be checked for possible traces of moisture. If necessary clean it thoroughly with deionised water or alcohol and
then dry it off carefully.
7.
Removal of sources of malfunction
With a soft toothbrush and water any residues can easily be removed from the electrode. Mild washing agents can also be used. Protein contaminations
on the diaphragm can be most likely removed with the cleaning solution (order no. 51 340 070).
Warning: Solutions containing hydrofluoric acid damage the pH sensitive part of the electrode.
8.
Disposal
It is the user's responsibility to dispose of the sensor in a professional manner. The sensor may contain electronic components that require correct dispos-
al such that no persons or the environment are endangered.
9.
Guarantee
On manufacturing defects 12 months after delivery.
10. Storage conditions
We recommend that the electrodes are stored at room temperature.
®
325X pH-single rod measuring cell is a low maintenance, autoclavable and pressure resistant pH electrode with a pre-
manufacturer of the electrode
type designation X = membrane glass, i = ISM Digital / SG = auxillary electrode /
yyy = rod length in mm / zzz = type of temperature sensor / ISM (Analog)
type of electrode
pH-measurement range
temperature range for operation (for sterilisation)
order number
ex-classification
identification and number of certificate
FM tested
instruction (see also: instruction manual)
®
325X, InPro
®
325X (ISM), InPro
®
325X i
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