HAMILTON 243187 PH- and ORP Sensors for Process Applications Instruction Manual
- June 3, 2024
- Hamilton
Table of Contents
Operating Instructions
For pH- and ORP sensors for process applications
Instruction Manual
243187 PH- and ORP Sensors for Process Applications
Operating Instructions for pH and ORP sensors for process applications
Introduction
These operating instructions are intended for all Hamilton process pH and ORP
sensors. The specifications in Table 1 (temperature, pressure, etc.) must not
be exceeded.
These instructions should be read, understood, and followed by all staff using
the device. Hamilton assumes no responsibility for damage and operational
disruptions arising from failure to observe these instructions.
Liability
The liability of Hamilton Bonaduz AG is detailed in the document «General
Terms and Conditions of Sale and Delivery (GTS)», chapter 12.
Hamilton is expressly not liable for direct or indirect losses arising from
use of the sensors. This includes malfunctions that can occur from the
inherently limited lifetime of sensors contingent upon their application.
The user is responsible for the calibration, maintenance, and regular
replacement of the sensors. In the case of critical sensor applications,
Hamilton recommends using back-up measuring points in order to avoid
consequential damages. The user is responsible for taking suitable precautions
in the event of a sensor failure.
Intended Use
These sensors are intended for the measurement of pH or ORP values. If the
sensors are used in potentially explosive atmospheres, the instructions in the
section «USE IN POTENTIALLY EXPLOSIVE ATMOSPHERES» must be followed.
Sensors with a VP-type connection have a built-in temperature sensor (Pt100 or
Pt1000). This temperature sensor is to be used only to compensate the pH
signal and not to control process temperature.
Initial operation
Check the sensor for any damage at the time of unpacking. A damaged sensor
should be returned to your Hamilton dealer in the original packaging.
Every product for shipment or sent back for repair must be decontaminated. If
working with hazardous liquids observe and carry out the maintenance
procedures, paying particular attention to cleaning and decontamination. If
the product becomes contaminated with biohazardous, radioactive or chemical
material, it should be cleaned.
Safety instructions
This sensor is only to be used for the intended purpose and under safe
conditions. Improper use or misuse can be dangerous. Assembly and maintenance
should only be carried out by trained personnel. Since these sensors are made
of glass, they should be handled with care. Sensors with a pressurized
reference system (EasyFerm Plus, EasyFerm Bio) have a risk of spontaneous
glass breakage. When working with this kind of sensor we recommend wearing
protective glasses. When cleaning or regenerating the sensors with acids/
bases or solvents, protective glasses and gloves are recommended. Take care
that the PG13,5 thread and the o-ring are not damaged while the sensor is
screwed into the process. O-Rings are subject to wear and tear and should be
replaced regularly (at least once per year).
If a high pressure sensor is operated for a considerable period of time above
10 bar, it should not be exposed to high temperatures (> 80° C) immediately
afterwards.
Air/gas bubbles may stick to the sensitive area of the sensor. As a
consequence, the measurement value might be wrong. In case of a shutdown of
the power supply (230 V) the measurement value could be wrong.
Preparing the sensor
Carefully remove the watering cap. Rinse the sensor with water. Check the
interior of the pH glass membrane for air bubbles. Allow any bubbles to rise
to the top by shaking the sensor gently.
Refillable sensor: Prior to measuring, open the reservoir stopper; close it
after measuring. Check level of electrolyte in the sensor.
If the sensor is going to be pressurized in an armature or housing, the
pressure should be 0.5 bars above process pressure.
Mounting
pH and ORP sensors perform best when installed at a 15° or more angle from the
horizontal, except the Polilyte Plus VP sensors those can also be mounted
upside down.
Screw the sensor into the housing with the PG thread. Ensure that the torque
of 1.5 Nm will not be exceeded to avoid damaging of the o-ring.
Electrical wiring
The sensors are equipped with an S8, K8, or a VP connector head (see Tab. 4).
Before connecting the sensor to the cable, check that the connections are
clean and dry. Do not touch the electrical contacts! VP connectors especially
should not be disconnected in moisture condensing environments. Unstable
signals, low slope, or long response time could indicate a moist or
contaminated connector. Clean the VP connector head with a paper towel
moistened with ethanol. Dry the connector head after this procedure with a dry
paper towel. If the sensor still has the described problems replace the VP
cable.
Polilyte Plus VP sensors are equipped with a solution ground. The solution
ground is a platinum wire located behind the liquid junction within the
reference electrode chamber. It is used to match the electronic ground of the
transmitter with the potential of the solution and must be connected to the
terminal «potential matching» (E+H, SIEMENS), «auxiliary electrode» (Knick,
Mettler-Toledo), or «solution ground» (Yokogawa, Emerson). The solution ground
should not be used to ground the solution. The current flowing through the
solution ground should not exceed 1 μA. Many transmitters offer additional
sensor diagnostics based on a solution ground contact. Polilyte Plus VP
sensors do not have a diaphragm. Therefore the signal of the diaphragm or
reference resistance is irrelevant.
Calibration and measurement
For calibration always use unused Hamilton DuraCal pH or ORP buffers.
Storing the sensor
Sensors should be stored with the watering cap attached, containing 3M KCl
solution (Ref 238036) or storagesolution (Ref 238931). Sensors stored dry
exhibit temporary drifting values. If the sensor dries out inadvertently, it
can be placed in storage solution overnight to regenerate.
Cleaning
In general, you can use acids, alkaline solutions, and commonly used solvents
for brief periods to clean electrodes with a glass shaft. Flush with water
after cleaning. After cleaning, electrodes are likely to exhibit
sluggishresponse times for a certain period, so place it in storage solution
for 15 minutes after cleaning.
PolyPlast type electrodes: Note limited resistance to chemicals, see «General»
below.
Ceramic diaphragm (liquid junction): If protein contamination occurs, the
electrode should be immersed in a solution of 0.4% HCl + 5 g/l pepsin for
several hours. If blackening of the diaphragm is apparent (silver compounds),
the electrode should be immersed in a solution of 0.4% HCl + 76 g/l thiourea.
If working with hazardous liquids observe and carry out the maintenance
procedures, paying particular attention to cleaning and decontamination.
Cleaning, assembly and maintenance should be performed by personnel trained in
such work. Do not use any abrasive tissues or cleaning materials and do not
use any cleaning chemicals other then described above.Before removing the
sensor from the measuring setup, always make sure that the setup is pressure-
less and cold and that no
process medium can be accidentally spilled. When removing and cleaning the
sensor, it is recommended to wear safety glasses and protective gloves.
Regenerating
pH: immerse sensor for 10 min in 0.1 – 1M NaOH, then for 10 min in 0.1 – 1M
HCl. After regeneration, placethe sensor in storage solution for a further 15
min.
ORP: metal surfaces can be cleaned with slightly abrasive substances, such as
toothpaste or very fine scouring powder.
Disposal
The design of Hamilton sensors minimizes environmental impact. According to
the EU directive 2012/19/EU (and the local laws), sensors should be disposed
of as electrical or electronic waste, and not as municipal waste.
Alternatively, it can be sent back to Hamilton for disposal.
Sensors with pressurized reference systems (EasyFerm Plus, EasyFerm Bio),
should be disposed in the supplied polystyrene packing. This will help prevent
injury should the sensor break.
General
The life cycle of sensors is determined by requirements regarding response
time, zero point, and slope.
Measurement conditions, especially high temperatures and aggressive
measurement solutions, can shorten the life cycle. Under favorable conditions,
the life cycle may be 1 – 3 years at room temperature and about 1 – 3 months
at 90°C. There is also a slight ageing factor during storage. Polyplast types
have limited chemical resistance. Extended contact with acidic or alkaline
solutions and alcohols should be avoided.
Ethers, esters, ketones, or aromatic and halogenated hydrocarbons attack the
shaft material and should therefore not be allowed to come in contact with the
sensor.
Tip: High-quality cables increase the length of the life cycle and yield more
stable measurement values.
See also «Lab & Process Sensors» at
www.hamiltoncompany.com
USE IN POTENTIALLY EXPLOSIVE ATMOSPHERES
ATEX / IECEx marking:| Gas: CE 0035 ll 1/2 G Ex ia llC T4/T5/T6 Ga/Gb
Gas (Polyplast only): CE 0035 ll 1/2 G Ex ia llB T4/T5/T6 Ga/Gb
Dust: CE 0035 ****ll 1/2 D Ex ia lllC T x °C Da/Db
---|---
Manufacturer:| Hamilton Bonaduz AG, CH-7402 Bonaduz
EC type examination report:| TÜV 03 ATEX 7005 X
IECEx certificate of conformity:| IECEx TUR 14.0001 X
EC type examination report and IECEx certificate of conformity can be
downloaded from www.hamiltoncompany.com.
The conditions described in the ATEX / IECEx certficate must be respected.
All ATEX specified pH and ORP electrodes: see Tab. 1
ATTENTION! In case a gas atmosphere and a dust atmosphere are, or could be, present at the same time, the risk of explosion must be examined carefully, and special precautions may be necessary.
Assembly
a) The operator of equipment in potentially explosive atmospheres is
responsible for ensuring that all components of the system are certified for
that area classification and are compatible with each other.
b) Electrodes may only be used in armatures intended for their specific
fitting length (a-length). For installation in gas atmospheres, the following
armatures are free to use:
– for all sensors from Tab. 1 with the exception of FermoTrode and ChemoTrode
types: see Tab. 2a.
– armatures for FermoTrode and ChemoTrode types: see Tab. 2b.
As a general rule for installation in gas atmospheres, the glass surface in
contact with the medium must be no more than 4 cm2 for equipment group llC; 25
cm2 for equipment group llB; and 50 cm2 for equipment group llA. For
installations in dust atmospheres, special restrictions may apply when using
armatures made of plastic meterial.
ATTENTION: Incorrect fitting or dismantling of the armature or the
electrode may lead to unintended release of a potentially explosive
atmosphere.
c) O-Rings having a sealing function between Ex-Zone 0 and 1, 20 and 21
respectively must be replaced at each dismantling of the sensor.
d) Sensors, wiring sections, transmitters and other required equipment are to
be set up within a single potential equalizing system.
e) When the sensor is assembled, the supplied ATEX / IECEx sticker is to be
attached to the cable in an easily visible place near the senor. The sticker
indicates that an ATEX / IECEx approved sensor is mounted.
The sticker must not be removed.
Connection to transmitter
The sensors listed in Tab. 1 are suitable for connection to an intrinsically
safe electrical circuit with protection level ia. The operator of the
equipment must ensure that the allowable electrical values for the sensor all
exceed those of the transmitter. None of the values cited for electrical
power, voltage, and current may be exceeded in total (measuring and
temperature circuit together). Electrical values for the sensors listed in
table 1 are as follows:
U = 24 V; I = 173 mA; The maximum process temperature for gas atmospheres is
defined in Tab. 3a. for dust atmospheres, the maximum surface temperature of
the sensor has to be observed. This surface temperature depends on the maximum
electrical power of the transmitter, see Tab. 3b.
The maximum allowable electric power P of the transmitter (measuring and
temperature circuit together) depends on the sensor type (Tab. 1) and the
desired process temperature.
Attention: The temperature limit given on the sensor must in any case be
respected.
Tab. 1 Hamilton ATEX / IECEx approved sensor families
Sensor| pH mV| T [°C]| p [bar]| A/S/ CIP|
Ex| Type
---|---|---|---|---|---|---
Polilyte Pro| 0 – 14| -10 – 60| 6| —| IIC| 7
Polilyte Pro VP| 0 – 14| -10 – 60| 6| —| IIC| 2
Polilyte RX| ± 2000| -10 – 60| 6| —| IIC| 7
Polilyte Plus , XP | 0 – 14| 0 – 130| 16, 50| A/S| IIC| 7
Polilyte Plus VP, XP VP| 0 – 14| 0 – 130| 16, 50| A/S| IIC| 1, 2
Polilyte Plus ORP| ± 2000| 0 – 130| 16| A/S| IIC| 7
Polilyte Plus RX XP VP| ± 2000| 0 – 130| 50| A/S| IIC| 1, 2
Polyplast Pro| 0 – 14| -10 – 40| 6| —| IIB| 7
Polyplast Pro RX| ± 2000| -10 – 40| 6| —| IIB| 7
EasyFerm Plus | 0 – 14| 0 – 140| 6| A/S/CIP| IIC| 7
EasyFerm Plus VP, LEVP| 0 – 14| 0 – 140| 6| A/S/CIP| IIC| 1, 2
EasyFerm Plus ORP| 0 – 14| 0 – 140| 6| A/S/CIP| IIC| 7
EasyFerm Bio | 0 – 14| 0 – 140| 6| A/S/CIP| IIC| 7
EasyFerm Bio VP| 0 – 14| 0 – 140| 6| A/S/CIP| IIC| 1, 2
MecoTrode| 0 – 14| 0 – 130| 16| —| IIC| 7
MecoTrode VP| 0 – 14| 0 – 130| 16| —| IIC| 1, 2
OxyTrode| 0 – 14| 0 – 130| 16| —| IIC| 7
FermoTrode| 0 – 14| 0 – 130| 4| A/S| IIC| 7
ChemoTrode| 0 – 14| 0 – 130| 6| S/CIP| IIC| 7
ChemoTrode VP| 0 – 14| 0 – 130| 6| S/CIP| IIC| 1, 2
ChemoTrode P| 0 – 14| 0 – 130| 6| S/CIP| IIC| 7
ChemoTrode ORP| 0 – 14| 0 – 130| 6| S/CIP| IIC| 7
Liq-Glass PG| 1 – 12| -5 – 60| 2| —| llC| 7
- depends on the pH glass used
*** pH glass
A = Autoclaving; S = Sterilization; CIP = Cleaning in place
Tab. 2a ATEX / IECEx approved armatures (not for ChemoTrodes or FermoTrodes)
| a-length 120| a-length 225
---|---|---
RetractoFit™ Series| —| ✓
RetractoFit™ Bio Series| —| ✓
FlexiFit™ Series| ✓| —
Retractex™ Series| —| ✓
- several part numbers possible
Tab. 2b ATEX / IECEx approved armatures for ChemoTrodes or FermoTrodes
| a-length 120| a-length 150| a-length 200 / 250
---|---|---|---
MasterFit™ 120 (Ref 237200)| ✓| —| —
MasterFit™ 150 (Ref 237225)| —| ✓| —
MasterFit™ 200 (Ref 237235)| —| —| ✓
Tab. 3a Maximum process temperature for gas atmospheres
| Type 1 | Pi ≤ 50 mW | Pi ≤ 125 mW | Pi ≤ 230 mW | Pi ≤ 360 mW |
|---|---|---|---|---|
| T4 | 125 °C | 119 °C | 111 °C | 100 °C |
| T5 | 90 °C | 84 °C | 76 °C | 65 °C |
| T6 | 71 °C | 58 °C | 39 °C | 15 °C |
| Type 2 | Pi ≤ 50 mW | Pi ≤ 100 mW | Pi ≤ 150 mW | Pi ≤ 360 mW |
| --- | --- | --- | --- | --- |
| T4 | 125 °C | 121 °C | 117 °C | 100 °C |
| T5 | 90 °C | 86 °C | 82 °C | 65 °C |
| T6 | 59 °C | 41 °C | 22 °C | Not allowed |
| Type 3 | Pi ≤ 50 mW | Pi ≤ 125 mW | Pi ≤ 230 mW | |
| --- | --- | --- | --- | |
| T4 | 123 °C | 114 °C | 102 °C | |
| T5 | 88 °C | 79 °C | 67 °C | |
| T6 | 71 °C | 58 °C | 39 °C | |
| Type 7 | Pi≤ 250 mW | |||
| --- | --- | |||
| T4 | 125 °C | |||
| T5 | 90 °C | |||
| T6 | 75 °C |
Tab. 3b Maximum process temperature for dust atmospheres
Table for the calculation of the maximum surface temperature «x» of the
sensors, as a function of the maximum electrical power of the transmitter
«Pi». «x» must be smaller than the ignition temperature of the dust involved.
| Type 1 and 3 | Pi ≤ 50 mW | Pi ≤ 125 mW | Pi ≤ 230 mW | Pi ≤ 360 mW |
|---|---|---|---|---|
| x = Ta + 9 °C | x = Ta + 22 °C | x = Ta + 41 °C | x = Ta + 65 °C | |
| Type 2 | Pi ≤ 50 mW | Pi ≤ 100 mW | Pi ≤ 150 mW | |
| --- | --- | --- | --- | |
| x = Ta + 21 °C | x = Ta + 39 °C | x = Ta + 58 °C | ||
| Type 7 | Pi ≤ 250 mW | |||
| --- | --- | |||
| x = Ta + 5 °C |
Ta: ambient / process temperature
Tab. 4 Pin assignment of connector heads
| Signal description | VP | S8 | K8 |
|---|---|---|---|
| pH glass | A | Core | Core |
| Reference electrode | B | Shield | Shield |
| T3 | C | – | – |
| Solution ground | D | – | – |
| T1 | E | – | – |
| T2 | F | – | – |
| – | Outer shield | – | – |
Pt1000: T1 / T2
Pt100: T1 / T2; T3 shorted with T1
Web: www.hamiltoncompany.com
USA: 800-648-5950
Europe: +41-58-610-10-10
To find a representative in your area, please visit
www.hamiltoncompany.com
Hamilton Americas & Pacific Rim
4970 Energy Way
Reno, Nevada 89502 USA
Tel: +1-775-858-3000
Fax: +1-775-856-7259
sales@hamiltoncompany.com
Hamilton Europe, Asia & Africa
Via Crusch 8
CH-7402 Bonaduz, Switzerland
Tel: +41-58-610-10-10
contact.pa.ch@hamilton.ch
This guide may be available in other languages. Visit
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information.
References
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