1. Plug the thermocouples into the logger’s numbered sockets. If you are using
a process file, ensure that the probe/socket numbers on the logger
correspond to those used to define probe numbers and locations in that file
(see the Insight software for an introduction to process files: press function
key F1, or select Help > Contents from the menu bar, and click the section
‘Process Files: Oven, Recipe, Product’). It is not necessary to have
thermocouples attached to every socket.
2. If not attached already, start data-collection by attaching the
MemoryPaq to the Transducer Interface (or to the Dual Interface
Block if used). After connecting them, the logger’s display briefly shows ‘t1’
if one Transducer Interface is attached, ‘t2’ if two are attached.
WARNING
All the thermocouples which are to be used must be plugged into the Transducer
Interface before the Transducer Interface is attached to the MemoryPaq. If any
thermocouples are plugged in after the MemoryPaq has been attached, data
from those thermocouples will be ignored.
Similarly, if a Dual Interface Block is fitted, either one or two Transducer
Interfaces (each with any number of thermocouples connected) may be attached
to it – but, if two Transducer Interfaces are used, both must be attached to the
Dual Interface Block before the MemoryPaq is plugged into it.
If a logger reset has not been carried out since the previous profile run,
data-collection parameters from the previous reset will be used. If the
trigger mode is plug-and-go, data-recording starts when the logger units
are connected together, and the green logger-status LED starts flashing at
the sample interval. If the trigger mode is rising temperature, data-
recording will start when the temperature of any probe reaches the value
specified during reset.
Data-recording cannot start until the logger has cooled sufficiently from the
previous run. If it is over 45°C/113°F, error ‘E1’ will show on the logger’s display
(see p. 21).
If the MemoryPaq display flashes ‘88’, the memory is full and/or the maximum of
10 profile runs has been stored. Data-recording will then not start, and data from
one or more profile runs must be downloaded before a further run can be
performed; see p. 57.
3. Ensure the barrier’s mating surfaces are clean and undamaged. A good seal
between barrier and thermocouple cables is essential if the logger is to be
protected. Put the logger in place in the barrier (within the heatsink if used),
laying the thermocouple cables across the sealing material to exit the
barrier at the cutout, ensuring they are side by side and not crossing each
other.
54 Running a Temperature Profile OVEN TRACKER XL2
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