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Certified Redox Calibration Standards
Redox calibration standards are a pre-prepared solution of a known redox value which is used to calibrate a Redox sensor.
All our Redox electrodes and Redox probes are tested before being despatched, and our Redox instruments are electrically calibrated using a certified Redox simulator prior to shipping - naturally we're able to supply a certificate of certification and traceability should one be required.
It is still necessary to calibrate a Redox sensor to a Redox instrument before it is put to use for process control, water treatment or effluent treatment applications.
There are a number of variations that can occur between different sensors of the same type, as well as the same sensor during its operational life time. This is why its important to conduct an initial 'wet calibration' as well as periodic calibration during the lifetime of the sensor.
Some of these variations include minute variation in the construction of one sensor against another, the operating temperature of the sensor, the amount of electrolyte flow at the beginning of a sensors operational lifespan versus the end of the sensors lifespan and the process within which the sensor is submerged.
It's important to note that we are calibrating the sensor to the instrument and that the point at which a calibration is being undertaken occurs in the environment in which the sensor is operating.
A sensor should always be calibrated in the environment where it will be used, with the equipment that it will be used with. We strongly recommend against calibrating a sensor in a remote location or using an another device.
Redox Calibration Procedure
Please note that Redox standards will deteriorate over time and that fresh standards should be used.
Our Redox calibration solution is laboratory manufactured from NIST approved chemicals to ensure that the Redox value at 25ºC corresponds to the given value.
The process for calibration is simple and documented within each of the operation and maintenance manual for each instrument we provide.
The standard procedure is to celibate the Zero mV input value first - that is when the Redox sensor is seeing an equilibrium or no Redox (or ORP) reaction taking place
Then a cleaned Redox sensor is inserted into a vessel containing the Redox calibration solution of known value. After a stabilisation period of no more than 25 minutes the value corresponding to the Redox calibration solution is normally displayed on the screen.
If the Redox value displayed does not correspond to the value on the packaging then this can be adjusted via the zero and span settings to ensure that the correct value is displayed.
Our instruments then use a 2 point, 3 point or 5 point Redox calibration procedure.
We offer a range of calibration solution values which to give a range of calibration points and to ensure longevity for the recorded Redox value.
We strongly recommend calibrating a Redox instrument to the calibration standards that are as close to the measured Redox value as possible.
For example - if you're anticipating a Redox value of circa 690mV for a chlorination application we would suggest using a Redox calibration standard of 616mV to ensure that the sensor is calibrated to the point closest to the measured value.
Certified Redox Calibration Standards
Our Redox calibration solution is available with certification showing that it complies and is certified to national standards traceable to UK accreditation services.
Our certified calibration solution can be supplied with a free of charge certificate of conformity - this is normally to indicate that the Redox standard meets our most recently published specification. This is normally taken to mean that the Redox buffer solution meets the specification printed on the label.
Our Redox Calibration Solution can be supplied with a Certificates of Analysis - this gives the actual analytical results specific to the batch within which the Redox standard was produced. According to the amount of work involved during the batch analysis we do have to charge for the supply of these certificates. Where the Redox calibration solution requires supporting evidence that it is within the specification of supply a certificate of conformity will normally suffice.
If you have a requirement for a certificate of analysis - which is normally at the bequest of an external audit or government agency then we can certainly discus providing you with a complete with certificate of analysis traceable to national standards.
Redox Calibration Solution Range
RBS 220 (220mV Redox Value)
220mV Redox Calibration standard with part number RBS220mV
Supplied in containers ranging from 100ml through to 5 Litres and is available on our container return scheme.
The RBS220mV can be supplied with a certificate of conformity for internal auditing purposes. We are also available to supply a 220mV calibration solution complete with a full certificates of analysis for external auditing purposes.
RBS 468 (468mV Redox Value)
468mV Redox Calibration standard with part number RBS468mV
Supplied in containers ranging from 100ml through to 5 Litres and is available on our container return scheme.
The RBS468mV can be supplied with a certificate of conformity for internal auditing purposes. We are also available to supply a 468mV calibration solution complete with a full certificates of analysis for external auditing purposes.
RBS 616 (616mV Redox Value)
616mV Redox Calibration standard with part number RBS616mV
Supplied in containers ranging from 100ml through to 5 Litres and is available on our container return scheme.
The RBS616mV can be supplied with a certificate of conformity for internal auditing purposes. We are also available to supply a 616mV calibration solution complete with a full certificates of analysis for external auditing purposes.