Hach-Lange POLYMETRON 8350, POLYMETRON 8351 User Manual [en, de, es, fr, it]
Document Number 221=683=050
POLYMETRON Model 8350/8351
pH and redox probes
Sondes de pH et redox
Sonden pH und redox
Sondas de pH y redox
Sonde di pH e redox
USER MANUAL
April 2010, Version B
Restriction of hazardous substances (RoHS)
The European Union RoHS Directive and subsequent regulations introduced in member states and
other countries limits the use of six hazardous substances used in the manufacturing of electrical and
electronic equipment.
Currently, monitoring and control instruments do not fall within the scope of the RoHS Directive,
however Hach Lange has taken the decision to adopt the recommendations in the Directive as the
target for all future product design and component purchasing.
Note: The following only applies to exports of this product into the People’s Republic of China.
Conductivity plastic sensor
(8310, 8311, 8312)
Conductivity stainless
steel sensor (8314, 8394)
Digital sensor PCB O O
Glass electrode O O
O
OO
O:
X:
INSTRUCTIONS FOR 8350-SERIES PROBES
1 SPECIFICATIONS........................................................................................... 2
2 INSTALLATION ..............................................................................................3
3 CONNECTION TO THE 9135 TRANSMITTER .............................................. 3
4 CALIBRATION................................................................................................5
4.1 pH.....................................................................................................................5
4.2 REDOX.............................................................................................................5
5 CLEANING AND RECONDITIONING ............................................................5
6 STORAGE ....................................................................................................... 6
7 PROBE AND ACCESSORY PART NUMBERS ............................................. 6
8 PRECAUTIONARY LABELS.......................................................................... 6
621=683=050 Issue B Hach Lange 04/2010 1/6
1 SPECIFICATIONS
The 8350 pH and 8351 redox probes are dedicated for process measurements (fouling) and are
protected against mechanical shochs.
All these pH probes incorporate process-contact temperature sensors and impedance control.
8350.4 8350.5 8351
Junction
PTFE Junction
Stainless steel
tube of Pt 100
Glass (flat)
PTFE Junction
Platinum ring
Glass
Platinum ring
Tube of Pt 100
NOTE: A special model, the 8350.3, is compatible with all the current, standard accessories and
is designed for use in contact with hydrofluoric acid.
8350.4 8350.5 8351
Application: Measuring pH at
high temperatures
Measuring pH in a
fouling environment
Measuring redox
Junction type Flat, PTFE Flat, PTFE Flat, PTFE
Body material PPS CPVC PPS
Measurement range 0…14 pH 0…12 pH ± 1500 mV
Maximum temperature (°C) 110 80 110
Maximum pressure 10 bar 10 bar 10 bar
Drift (/ week) < 3 mV < 3 mV < 3 mV
Offset @ pH7 ± 20 mV ± 20 mV -
Slope 56…61 mV / pH 56…61 mV / pH -
Reference impedance @ 25 °C < 50 kohm < 50 kohm < 50 kohm
Glass impedance @ 25 °C 150 … 500 Mohm 50…250 Mohm Platinum
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2 INSTALLATION
The 8350 probes should be installed vertically for optimal results. They may, however, be installed
horizontally or upside down.
• Insertion mounting: screw-in or flange fitting.
• Immersion mounting: immersion shafts (0.5m; 1m; 1.5m) with fixed, adjustable or clip-type
flanges.
The probes are fitted with 10 metres of cable as standard.
For longer cable lengths, up to 25m, use a straight junction box (08350=A=8500) and the 2654
cable (358048,00000).
For even longer cable lengths, use a pre-amplifier unit (08350=A=8000) and the 2666 cable
(370=506=025).
In this case it will not be possible to monitor the impedance.
3 CONNECTION TO THE 9135 TRANSMITTER
• DIRECTLY TO THE 9135
Temp + (pt100)
Temp - (pt100)
Input (measured pH or rH)
Ref. (reference)
Liquid earth (liquid contact)
white
red
clear
black
blue
Probe
External
shielding
EMC
protection
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• VIA THE 08350=A=8000 PRE-AMPLIFIER UNIT
It is impossible to connect the liquid earth in this case.
Ext.
Shielding
white
pink
yellow
brown
grey
green
2666 cable
EMC
protection
Temp + (Pt 100)
Temp - (Pt 100)
Ref. (Reference)
+ V
- V
Input (pH/rH )
08350=A=8000 Pre-amplif ier
Temp + (Pt 100)
Temp - (Pt 100)
Ref. (Reference)
Input (pH/rH )
EMC
protection
Probe
white
red
black
Clear
Ext.
Shielding
• USING THE 08350=A=8500 JUNCTION BOX
2654
Core
Schielding
white
violet
yellow / green
Ext.
Shielding
Input (pH/ rH)
Ref. (Reference)
Temp + (Pt 100)
Temp - (Pt 100)
Liquid earth (contact)
protection
EMC
08350=A=8500 Junction box
protection
Input (pH/ rH)
Ref. (Reference)
Temp + (Pt 100)
Temp - (Pt 100)
Liquid earth (contact)
EMC
Probe
Ext.
Shielding
Clear
black
red
white
blue
For pH probes only:
Temperature measurement.
- Impedance measurement (the blue wire from the transmitter's "liquid earth"): programme the control frequency and the upper and lower
limits (refer to the instructions for the 9135 transmitter):
Glass impedance: 50 Mohm - 500 Mohm
Reference impedance: 1…100 kohm
4 CALIBRATION
Before calibrating for the first time:
• Shake the probe gently to remove any air bubbles from underneath the glass bulb.
• Remove the storage cap and rinse the probe with demineralised water.
4.1 pH
Refer to the pH transmitter's instructions to select the correct calibration type.
• Rinse the probe with the freshly prepared first buffer solution (pH 6.88 or 7.00), ideally at
the temperature of the sample to be measured.
• Immerse the probe (to a depth of 4 to 5cm) and wait for stable measurements before
calibrating.
• Rinse the probe, first with demineralised water and then with the second buffer solution
(pH close to that of the process, 4.00 or 9.22).
• Immerse the probe (to a depth of 4 to 5cm) and wait for stable measurements before
calibrating.
• Rinse the probe in demineralised water.
4.2 REDOX
• Rinse the probe using a standard, freshly prepared quinhydrone solution, ideally at the
temperature of the sample to be measured.
• Immerse the probe (to a depth of 4 to 5cm) and wait for stable measurements before
calibrating.
The potential is measured with respect to the Ag/AgCl reference system. Add 200mV for an
reference potential.
E
H2
5 CLEANING AND RECONDITIONING
These electrodes are considered as consumable items and therefore have a limited lifespan,
largely dependant on the user's application. Under normal conditions, a typical lifespan would be
about one year.
Before replacing them, however, simply cleaning the electrodes may restore them.
Such cleaning will also be necessary whenever the following are observed:
• An offset from zero or a measurement drift (the reference system is contaminated).
• A significant drop in response time and a loss of slope (there is fouling on the glass diaphragm
or the platinum).
Provided the glass diaphragm is neither scratched nor cracked, follow one of the cleaning
procedures below:
• Salt deposits: HCl 0.1M (5 mins) + NaOH 0.1M (5 mins)
• Grease or oil film: Detergent + water
• Reference junction fouled: KCl 3M @ 60-80 °C for 10 mins, then cool in KCl 3M@25 °C
• Calcium, metal hydroxide or protein deposits: HCl 10% for 10 mins
• Redox measurements:
• Deposits/ wear: aqua regia (1/1 concentrated HCl / concentrated HNO
only be carried out by qualified individuals.
If the electrode's response is not improved, replace it.
); this process must
3
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6 STORAGE
Never store the probes in air or under a dry protective cap. The cap must be moistened with KCl
3M.
Storage temperature: 10 to 30 °C.
Typical duration: 6 months.
7 PROBE AND ACCESSORY PART NUMBERS
08350=C=0003 Combination pH probe and temperature sensor for hydrofluoric acid
08350=C=0004 High temperature combination pH probe with protected sensor,
08350=C=0005 Combination pH probe for fouling environments incorporating a protected,
08351=C=0000 Combination redox probe for high temperature use
08350=A=9500 PVC DN 40 flow chamber, flange-type probe fitting
08350=A=1105/10/15 PP immersion shafts, clep fitting, L = 0.5 / 1 / 1.5m
08350=A=1005/10/15 PP immersion shafts, adjustable flange, L = 0.5 / 1 / 1.5m
08350=A=6005/10/15 PP immersion shafts, fixe flange, L = 0.5 / 1 / 1.5m
08350=A=7000 Pps chemical cleaning kit (nozzle and feed pipes)
08350=A=4000 Liquid reservoir unit
08350=A=8500 Junction box
08350=A=8000 Pre-amplifier for 8350-type probes
370=506=025 Low-impedance cable, type 2666
358048,00000 High-impedance co-axial cable, type 2654
environments.
impedance control and temperature sensor.
flat sensor, impedance control and temperature sensor
8 PRECAUTIONARY LABELS
Read all labels and tags attached to the instrument.
Personal injury or damage to this instrument could occur if not observed.
!
This symbol, if noted on the instrument, references the instruction manual for
operation and / or safety information.
Electrical equipment marked with this symbol may not be disposed of in European
public disposal systems after 12 August of 2005. In conformity with European local
and national regulations (EU Directive 2002/96/EC), European electrical
equipment users must now return old or end-of life equipment to the Producer for
Note: For return for recycling, please contact the equipment producer or supplier for instructions
on how to return end-of-life equipment for proper disposal.
Important document. Retain with product records.
disposal at no charge to the user.
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MANUEL D’UTILISATION SONDES 8350
1 SPECIFICATIONS........................................................................................... 2
2 INSTALLATION ..............................................................................................3
3 BRANCHEMENT SUR LE TRANSMETTEUR 9135 ...................................... 3
4 ETALONNAGE................................................................................................ 5
4.1 pH.....................................................................................................................5
4.2 REDOX.............................................................................................................5
5 NETTOYAGE ET REGENERATION............................................................... 5
6 CONSERVATION............................................................................................ 6
7 CODES SONDES ET ACCESSOIRES........................................................... 6
8 MARQUE DE PRECAUTION.......................................................................... 6
621=683=050 Rév.B Hach Lange 04/2010 1/6
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