Isotech MEDUSA 511 Specifications

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CALIBRATION SOLUTIONS

Dry Block Calibrator

30 to 700°C

510 Medusa & 511 Medusa 3

g

45 x 285mm Calibration Volume

g

Use for Comparison and Fixed Point Calibration

g

Use with very long thermometers

Isotech have a wide range of Dry Blocks to suit probes requiring
a large immersion depth. These products feature large and
deep calibration volumes. As such they are less portable
than the earlier Dry Blocks, but have higher capacities and
retain outstanding temperature uniformity, this uniformity is
so good that these larger products are also apparatus for
Secondary Laboratories to realize the Fixed Points of ITS-90.

Medusa 510 has a maximum operating temperature of 550°C.
The Medusa Model 511 can be used to 700°C and features
three zone control. In addition to the main heating zone there
are additional top and bottom heaters which compensate for
the end losses creating a constant temperature zone across
the well.

For Comparison Calibration the Medusa should be used with
an insert, the standard insert has six 8mm pockets 250mm
deep. Also available is an insert 44mm diameter x 170mm
deep which is suspended from the top of the block so that
the height is user adjustable. For flexibility the Medusa can
also be used with accessories for infrared thermometers and
surface sensors. The Medusa is available in two models, the
BASIC (B) and the SITE (S). The B model includes a
sophisticated temperature controller with a dual display for
Set Temperature and Dry Block Temperature.

The S model includes a built-in digital thermometer to which
an external standard thermometer can be connected giving
greater accuracy, eliminating temperature gradient and loading
errors. Also included in the site model is a timer which can
set the bath between two temperatures, and automate ITS­90 fixed point operation. For Surface Sensor and Blackbody
use an external thermometer is recommended. For laboratory
accuracy the Medusa can be used with a high-end
temperature indicator such as an Isotech TTI model.

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 auto­ranging front display. The controller features multi-point
block to display correction giving good absolute accuracy.

The S model has 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

addressable over the communications link.

indicator and controller are both

Fixed Point Cells Available

Material Temperature

Gallium 29.7646°C

Indium 156.5985°C

Tin 231.928°C

Zinc 419.527°C

Aluminium 660.323°C

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CALIBRATION SOLUTIONS

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Specification

0.3°C

0.25°C

0.2°C

0.15°C

0.1°C

0.05°C

0°C 100°C 200°C 300°C 400°C 500°C 600°C 700°C

0°C

510 Medusa

Medusa 3 Audit Calibration (Similar Sensors)
S Model with 935-14-95 Senso and UKAS

Medusa 2 Audit Calibration (Similar Sensors)
S Model with 935-14-95 Senso and UKAS

Medusa 3
Radial Homogeneity

Medusa 2
Radial Homogeneity

Model 510 Medusa 511 Medusa 3

Temperature Range 30°C to 550°C 50°C to 700°C

Absolute stability Metal Block Bath ±0.03°C
over 30 minutes Blackbody Source ±0.1°C
Surface Sensor Calibrator ±0.5°C
ITS-90 Fixed Point ±0.001°C

Computer Interface Included with Software

Cools from 550°C to 30°C in 5 hours

Heats from 30°C to 550°C in 90 minutes

Uncertainties Refer to Uncertainties Graph

Calibration volume 45mm diameter by 285mm deep

Standard Insert Six 8mm pockets all 250mm deep

Display Resolution (0.01) to 99.99
(0.1) 100.0 to 650.0
PC can display 0.01 across whole range with the software included

Indicator units °C, °F, K

Power 108 to 130V or 208 to 240V 50 / 60Hz
1000 Watts 1800 Watts

Overall dimensions Height 430mm
Width 310mm
Depth 300mm
Weight 17kg 25kg

Performance and Use

Features (Basic & Site) Medusa

Dry Block ü

Surface Sensor Option ü

Infrared Calibration Option ü

ITS-90 Fixed Point Cells ü

Additional 8mm Pre-heat Pocket ü

Configurable Units: °C, °F and K ü

Supply Voltage Power Correction ü

Calibration and Uncertainty

A certificate, traceable to National Standards, is included
as standard. Recommended is an optional UKAS
five-point calibration.

The accuracy of the Medusa will depend very much on
the mode of use, see the Uncertainty Graph for typical
uncertainties. NTPL calculate the uncertainties to UKAS
requirements. The Medusa meets the Calibration Capacity
requirements of EA-10/13, “EA Guidelines on the
Calibration of Temperature Block Calibrators.”

Additional Features (Site) Medusa

Independant Temperature indicator ü

Universal Input Types PT100 ü

Thermocouples Types K,N,R,S,L,PL2,T,J,E ü

Linear Process Inputs Including 4-20 mA ü

Stand Alone Thermostat Testing ü

Thermostat Testing With PC ü

Five Point Digital Probe Matching ü

Configurable Units: °C, °F and K ü