Isotech Isobox 842 Specifications

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CALIBRATION SOLUTIONS

Thermocouple Reference Unit

-20 to 70°C

g

Water Proof Cased

g

Large Capacity

g

Approved for Power Station Use

The function of this reference unit differs from other cased
systems in that the temperature of the metal block in which
the thermocouple and copper leads are inserted, actually
varies with ambient temperature. A separate output signal
is produced which is proportional to the difference
between the environmental temperature and the actual
reference temperature. The output signal can be fed
directly into a computer/data logger to give accurate
compensation over a large ambient range. A thermal
reservoir, heavily insulated, contains the reference junction
probes. The reservoir temperature slowly follows the
ambient temperature; an electrical compensation device is
thermally integrated with the reservoir and thus senses the
reservoir temperature. The device produces an output
proportional to the difference between the reservoir
temperature and the reference temperature (usually 0°C).

Isobox Model 842

This is the signal the computer/data logger uses to
compensate for the temperature of the reference probes
junctions.

The output signal can be in the form of a DC mV output,
4-20 mA or from a platinum resistance thermometer.
Please discuss prior to order.

Units are housed in robust weatherproof enclosures to
IP66 incorporating bottom gland plate. Fixing lugs for wall
mounting are provided. Easy access to terminal rails and
block assembly is via a lockable hinged front door.

Note:

Waterproof Cased Ambient Temperature Thermocouple Referencing System.
Large Capacity up to 100 Thermocouples.
Wide Ambient Range.
Approved for Power Station Use.

Model 842

Referencing Temp Effectively 0°C

Accuracy ±0.1°C per 10° ambient span

Long Term Stability ±0.05°C per 1000 Hours

Temperature Gradient ±0.1°C between Junctions

Stabilisation Time 10 minutes

Ambient Temperature -20°C to +70°C

Thermocouple 0 to 100 channels

Capacity Double junction referencing

Power 10 Watts typical

100-130 or 208-240 VAC 50/60Hz
Low level D.C.
Consumption 6VA typical
Passive Option Available

Dimensions Height 600mm

Width 600mm
Depth 300mm

Weight 40kg

note:

Numerous special versions are available and can be supplied
either in their existing form or modified to customers’
requirements.

How to order

Model 842
Isoboxes are normally uniquely specified for each order.
Please discuss your exact requirements with us before ordering.