We offer an excellent recalibration service for all CTG Ltd products and recommend that instruments are calibrated by us on a regular basis to ensure optimum performance. We can guarantee fast turn round times and competitive prices. 

Download Fact Sheet on Calibration Facility 

Temperature
A 50 litre capacity temperature controlled bath has been installed, with a working volume of 550x300x250 mm. This has a stability of better than 1mK over the temperature range -1^o to 65^oC. The temperature of the fluid is independently measured with a platinum resistance thermometer with 0.2mK resolution and 1mK accuracy. Routinely, calibrations are performed in the range 2.5 to 29.5^oC, but work outside this range can be undertaken to special order. Reporting can be either on the ITS-90 or IPTS-68 scale. 

Pressure
Two new dead weight testers (pressure balances) have been installed. One is a pneumatic instrument covering the range 0.1 to 7MPa absolute (0 to 700m depth), with a measurement uncertainty of 0.0035% of reading, plus 0.1kPa (1mBar). The second is a hydraulic unit covering the range 0.3 to 60MPa gauge (30 to 6000m depth), with a measurement uncertainty of 0.01% of reading. Reporting can be in any pressure units (corrected to standard atmospheric pressure) or depth units corrected to a given latitude, temperature and salinity.

Conductivity
Five new 400 litre capacity baths, each with continuous filtration, have been installed for conductivity calibration in the range 0 to 5 Siemens per metre. The salinity of each is determined at the time of calibration by comparison to IAPSO standard sea-water with an autosalinometer.  Reporting can be either in conductivity ratio or electrical conductivity units (assuming a conductivity of 4.2914 S/m for standard sea-water at 15^o).

Fluorimeters
Standard calibrations of fluorimeters can be undertaken using chlorophyll-a in acetone, Rhodamine in water, carbazole in water (for hydrocarbon fluorimeters) or perylene in ethanol (for Gelbstoffe fluorimeters) in the range 0.0001 to 100µg/l concentration. Measurements using other fluorophors, solvents and concentrations can be undertaken to special order. Nephelometers can also be calibrated to BS6068.