Isotech 525 Specifications

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SOLUTIONS FOR PRIMARY & SECONDARY LABORATORIES

-100 to 40°C

http://www.isotech.co .uk

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20,000 hours testing, equal to 10 years use

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Minimum Temperature -100°C (-148°F)

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No expensive liquids

The 525 Dry Block offers operation to temperatures as
low as -100°C, and is the only block bath working to
such a low temperature. Now it is possible to calibrate
temperature sensors such as PRTs, Thermocouples and
Thermistors at ultra low temperatures without the need
for a liquid bath.

Portability and Safety

Unlike a liquid bath the Isis requires no costly, or
hazardous fluids and offers greater portability. This will
be of particular value to calibration engineers working on
site with low temperature freezers as encountered in
pharmaceutical, aeronautical and food environments.

-100°C Dry Block

525

The minimum operating temperature is less than stirred
liquid laboratory calibration baths and users in
laboratories will also benefit by avoiding the ongoing
need for expensive fluids.

The maximum operating temperature is 40°C, a little
higher than the minimum operating temperature of
Isotech Hot Blocks. This permits covering the range from

-100°C to 650°C or higher with just two Isotech blocks.
By limiting the maximum temperature the reliability and
operating life of the cooling engine is maximised, and
has been agreed in consultation with the licensee of the
cooling technology, see below.

Cooling Technology

The 525 makes use of a Free Piston Stirling Cooler
(FPSC) which provides a massive 80 Watts of cooling
power to the calibration block. Specialist materials,
patent applied for, are used for the heat transfer from the
FPSC to the block.

Operating Life

Reliability is a prime attribute of this revolutionary new
product. Testing at 20,000 hours (nominally equivalent to
10 years at 40 hours use each week) shows that -100°C
is still possible, with an increase in cooling time <10%.

Benefits

Isotech can offer full support with options for UKAS / ILAC
calibration, tutorial on getting the best calibration
uncertainties and a full range of supporting reference
thermometers, indicators and software.

The 525 has a large insert 35mm diameter by 160mm
deep. This allows for calibration of multiple sensors. For
thermal validation applications there is an insert with
pockets for a reference probe (6.5mm) and 20 x 3.5mm
pockets for thermocouples. This allows a single
calibration cycle to validate up to 20 probes at a time.

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SOLUTIONS FOR PRIMARY & SECONDARY LABORATORIES

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The 525 Dry Block Model 525

Standard Insert A

9.5mm, 8.0mm,

6.4mm, 6.4mm,

4.5mm, 4.5mm
All 157 deep

Standard Insert B

13mm, 10mm,
8mm, 5mm
and 3.5mm
All 157 deep

Standard Insert C

8mm and
6 x 6.5mm
All 157 deep

METAL BLOCK INSERTS

ALTERNATIVE INSERTS

Validation Insert

6.5mm and
20 x 3.5mm
All 157 deep

The only Dry Block working to -100°C

Model 525

Temperature Range -100°C to +40°C

Approximate time -20°C 20 minutes
to Temperature -40°C 30 minutes
from Ambient -60°C 40 minutes

-80°C 60 minutes

-100°C 90 minutes

Absolute Stability At 0°C ±0.03°C (30 minutes)
At -90°C ±0.02°C (30 minutes)

Radial Homogeneity 0.01°C
(similar pockets)

Vertical gradients 0°C 0.1°C
(over bottom 40mm) -90°C 0.2°C

Calibration Volume 35mm diameter x 160mm deep (Excludes Insulating Cap)

Standard Insert 6 thermometer wells as standard (9.5mm, 8.0mm, 6.4mm, 6.4mm, 4.5mm and 4.5mm

Power 200W

Voltage 100-240Vac, 50/60Hz

Dimensions 215mm(W) x 420mm (D) x 640mm (H)

Weight 22.7kg

All 157 deep)