250°C to 30°C
To calibrate temperature sensors to 250°C look no further than the portable stirred liquid baths. The Drago calibrates from 30 to 250°C and the Hyperion from 45°C below ambient to 140°C, refer to separate sheet. The useable calibration volume is 65mm diameter and the overall depth of 190mm gives more than twice the volume of alternative products. We allow 15mm for the magnetic stirrer and assume that the liquid in the bath is on average 15mm from the rim. We therefore quote 160mm as the working depth.
Stirred liquid baths are suitable for temperature sensors of all types, shapes and sizes. Accuracies are much greater than those from Dry Blocks alone and with suitable reference thermometers performance of up to 0.005°C is achievable.
The Drago is available in two models. If the liquid is directly in the block then the controller only model, or Basic (B) model, can be selected. This model is also suitable where an external indicator and standard will be used. Alternatively the site model (S) includes a built in temperature indicator for high accuracy or for best accuracy an external indicator can be used, an ideal combination is the TTI-6 and 935-14-16 Probe, for more information refer to databook 3. The S model can be provided with UKAS certification.
The Drago can also be used with the supplied Cal NotePad software to automatically calibrate thermostats.
When using a separate indicator and probe (SITE or Stand Alone Model) then different accessories can be added for Dry Block, Blackbody, Surface Sensor, Liquid Containers and even ITS-90 fixed point operation.

Includes as standard: Windows Software, Computer Interface and a Ramp to Set Point Feature. Increased resolution of ±0.01 available throughout the range via the PC interface and from 0.01 to +99.99 locally on the auto-ranging front display. The controller features multi-point block to display correction giving good absolute accuracy.
New in the S model is universal sensor input allowing Platinum Resistance Thermometers, Thermocouples (types K, N, R, S, L, B, PL2, T, J and E) along with Linear Process Inputs including 4-20mA current transmitters to be displayed on the in-built indicator. The indicator can be programmed with up to five calibration points to provide high accuracy digital probe matching. The indicator and controller are both addressable over the communications link.

Features
65mm Diameter Calibration Volume
Portable Liquid Bath for high accuracy calibration of awkward shaped sensors
Convertible for Dry Block Operation and more
Calibrate all Sensor types
Windows Software and PC Interface as standard

Options

Note: Instead of putting liquids directly in the block liquid containers can be used to facilitate rapid change of liquids.
When using a liquid container, Dry Block Insert, Blackbody Target or the Surface Sensor Kit a separate reference thermometer should be used to compensate for the varying offset between the controller and the accessory temperature.
Suitable choices include the SITE model with probe.

DragoPLUS Performance - Dry Block

For Evaluation Reports, Uncertainty Budgets and Calculations with regard to EA10-13 UKAS etc, please contact Isotech - also http://www.isotech.co.uk/refer.html