- What is the recommended frequency of recalibration/ re-certification of Density Meters?
- How do you calibrate?
- What is the target turnaround time?
- What types of density meter are you able to calibrate?
- Do you calibrate the temperature indication in my density meter?
- At what temperature should I have my density meter calibrated?
- Over what density range should I have my meter calibrated?
- Can you adjust my density meter?
- Can you calibrate optical density meters?
- Do you service density meters?
We recommend that density meters are calibrated when new, and then receive an initial recalibration after 1 year. Thereafter the recalibration interval really depends upon how important the measured densities are to you. Only you will know how important accurate and traceable results are to your organisation.
Our paper ‘How often should I calibrate‘ also offers some general advice.
Meters can be divided into two groups: those that have their own thermostat – almost all laboratory bench-top meters, and those which cannot control sample temperature – such as hand-held and on-line meters. If a meter can control its own temperature, we set it to stabilise at calibration temperature overnight before starting the calibration. If it cannot control its own temperature, we install it in a temperature controlled chamber.
Once we are confident that the meter is at a constant temperature, we check the displayed temperature reading using a platinum resistance thermometer.
Having determined the error, if any, on the displayed temperature we then calibrate the density measurement by filling the cell with liquid density standards which have been calibrated using our hydrostatic weighing system.
We aim to return laboratory density meters within 2 weeks of receipt. (UK mainland only). On-line meters will take longer.
We can calibrate a wide range of density meters, both in our lab and on site. Please contact us for more information.
If a density meter can measure sample temperature, and almost all models can, then calibration of the temperature sensor is normally the first step before calibrating the density measurement. We would normally calibrate the sensor at the same temperature as we calibrate the density measurement, but can calibrate it at different temperatures if necessary. For meters which do not contain their own temperature controller, we do this by either placing the meter in an environmental chamber or passing thermostated water through the meter.
You should ask to have your density meter calibrated at the temperature at which you usually use it. Our accreditation permits us to calibrate density meters between 0 and 156°C.
The linearity of density meters differs radically for model to model (and sometimes even between instruments of the same model). We therefore recommend that the calibration range should be restricted to the density range over which the meter is used.
Depends on the model. Please contact us for more information.
No, sorry. These meters measure optical properties, not liquid density. Search for an accredited lab at UKAS.com.
We prefer not to, but can normally clean a meter if it arrives too dirty to calibrate. There may be an additional charge for this. If necesary we can arrange to send it to the manufacturer for repairs.