By Professionals for Professionals

Calibration Services From Signatrol Ltd

Why Calibrate?
Calibration is an essential part of any quality control system, You may have the best records in the world, but if the equipment used to record those values is not accurate, then the record is meaningless.

All quality systems, such as ISO 9001:2000, require that all measurement equipment used to verify or control quality must be regularly calibrated, and all such calibrations are required to be traceable to national or international standards (ISO 9001 2000 section 7.6). Records of calibrations are required to be kept and corrective action taken when measurement equipment is found to be out of specification.
All such equipment must be calibrated either
• at regular intervals
• or prior to use

In either case the basis of calibration must be traceable back to an approved laboratory.

Test equipment must then be:
• adjusted as necessary
• identified as being in date
• tamper protected

Calibration Interval
How often do I need to calibrate? This is a question often asked and it depends upon a number of factors:
• The quality and stability of the measuring equipment
• The initial accuracy specification
• The importance of the absolute measurement accuracy.
• Whether there is a secondary back-up device
• Manufacturers recommendations

Calibration intervals are therefore established to ensure that test and measuring equipment are functioning within expected tolerance limits at time of use. Implicit in the application of calibration intervals is the understanding that the calibration values may change over time and will require periodic recalibration to be maintained within acceptable limits.

The calibration interval will therefore be decided by the Calibration Manager taking all these factors into account. Often they will rely on the manufacturer recommendations as they know their product the best and will have conducted tests at the design stage. Alternatively the Calibration Manager may choose to build up a calibration model by checking the calibrations at short intervals ( Say 3 months) and recording the amount the parameter has drifted since the last calibration. In this way a model can be created which defines the maximum period between calibrations.

By optimising calibration intervals, unnecessary calibrations can be minimized, thereby reducing costs. Moreover, optimising intervals will improve compliance with regulatory directives while ensuring maximum compliance with reliability targets.

Managing Calibrations
Calibration managers are faced with increasing pressures to minimize costs while improving compliance with their chosen standard whilst improving the reliability of measurement and test equipment.

The Calibration manager must therefore ensure that:
• Each piece of equipment is calibrated at this interval.
• Each piece of equipment is marked with an appropriate label containing a unique reference number, the calibration date and the date the next calibration will be required.
• The calibrations are inviolate and cannot be altered by unauthorised personnel.
• A record of the calibration is maintained and retained for historical purposes

Do I need a Calibration Certificate with a new product?
This is a question that is often asked and there is no right or wrong answer. When a product is new it has almost certainly been calibrated at the manufacturers with certified calibration equipment and it is therefore probable that the equipment meets its published specifications. Many customers ask for a Certificate of Conformity to confirm its compliance and deem that satisfactory for the initial calibration interval. In critical applications however, some companies require that there is always a valid calibration certificate and ask for that as an additional safeguard.

How can Signatrol Help?

All Signatrol data loggers have a calibration date reminder function so that the customer does not need to operate a separate re-calibration reminder system. The interval is set by default to 12 months but can be set to other periods by an authorised person. When the calibration is due a reminder is shown on the screen. This reminder is factory reset at the time of calibration.

Signatrol offers a fast turn-around on temperature and relative humidity calibrations for our own data loggers and also for other data loggers or handheld thermometers. In the case of our own products, the internal calibration date is reset.

Whilst we are not a UKAS accredited laboratory, our temperature, relative humidity and process signal calibration facilities are traceable back to UKAS. Each piece of  calibration equipment used has an individual calibration certificate that can be traced back to the UKAS standard. All certificates are retained for a minimum period of 10 years should the original be lost and replacement copies required. Our certificates are always available for download in PDF format - see the table below...

View Certificates Of Our Calibration Equipment

Click on the certificate number to view the PDF of the relevant certificate:

Instrument Serial Number
Certificate Valid From Valid To
Agilent 34401A Digital Multimeter  MY41050872 17002/R 3rd November 2009 3rd November 2010
Agilent 34401A Digital Multimeter
18944 2nd November 2010 2nd November 2011
Agilent 34401A Digital Multimeter
20708 11th November 2011 10th November 2012
Agilent 34401A Digital Multimeter
23378 08th March 2013 07th March 2014
Agilent 34401A Digital Multimeter
25593 06th March 2014 05th March 2015
Agilent 34401A Digital Multimeter
27th February 2015
 26th February 2016
ETI Reference Thermometer including Sensor
18th October 2012 17th October 2013
ETI Reference Thermometer including Sensor
25th October 2012 25th October 2013
ETI Reference Thermometer including Sensor
 20th August 2013
 20th August 2014
ETI Reference Thermometer including Sensor
 5th August 2014
 5th August 2015
ETI Reference Thermometer including Sensor
 8th January 2014
 8th January 2015
ETI Reference Thermometer including Sensor D13510524  220115/N1 21st January 2015 21st January 2016
Eurotron Calibrator  0049272 180909-N9 18th September 2009 18th September 2010
Eurotron Calibrator  0049272 280910-N15 23rd September 2010 23rd September 2011
Eurotron Calibrator  0049272 031011-N1 29th September 2011 28th September 2012
Eurotron Calibrator  0049272 191012/N1 17th October 2012    17th October 2013
 Eurotron Calibrator   
 0049272  230813/N21  22nd August 2013     
22nd August 2014
 Eurotron Calibrator   
 0049272  290814/S3  28th August 2014     
28th August 2015
Gallenkamp Thermometer  CE09/JN/10104-1 R34018T 9th October 2008 9th October 2009
Gallenkamp Thermometer  
U38377T 12th October 2009 12th October 2010
Gallenkamp Thermometer
U40620T 13th October 2010 13th October 2011
Gallenkamp Thermometer
Issue 2
26th October 2011 13th October 2012
Gallenkamp Thermometer
U45112T 19th October 2012 19th October 2013
Gallenkamp Thermometer
U47483T 16th October 2013 16th October 2014
Gallenkamp ThermometerCE09/JN/10104-16043924th October 201424th October 2015
Hewlett Packard  3478A Digital Multimeter  2911A61208 22668 2nd November 2012 2nd November 2013
Hewlett Packard  3478A Digital Multimeter 2911A612082714824th October 201424th October 2015
Keithley Voltage Source K30448527 2714924th October 201424th October 2015
Rotronic  HygroClip S  44787147 16910a 27th November 2009 27th November 2010
Rotronic HC2-S
 60508298  18287 9th November 2010 9th November 2011
Rotronic HC2-S
 60785619  19898 10th November 2011 9th November 2012
Rotronic HC2-S
 60508298  22315 25th October 2012 25th October 2013
Rotronic HC2-S
 60785619  24075/24039a 25th October 2013 25th October 2014
Rotronic HC2-S60508298
2552718th September 201418th September 2015
 1/10 Din Temperature Probe  74217-01 000001520 12th October 2010 12th October 2011
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