ISA ZERO TOUCH T12, Use And Maintenance Manual

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3.6.1 Needle probe insertion test
If the needle probe is enabled or if parameter P3 is set to a value other than 0, temperature controlled cycles are
preceded by a two-phase test to check that the needle probe is correctly inserted. If the needle probe is not enabled or
if parameter P3 is set at 0, only time controlled cycles can be selected.
The test consists of two phases, the second only carried out if the first was not successfully completed. Phase one is
successfully completed if the gap between the "temperature detected by the needle probe" and the "cabinet
temperature" is greater than the value set by parameter r17 in at least three out of five checks, these checks being
performed at ten-second intervals. The second phase is successfully completed if the gap between the "temperature
detected by the needle probe" and the "cabinet temperature" is greater than 1°C/1°F, as compared to the check
previously carried out, in at least six out of eight checks, these checks being performed at intervals corresponding to
1/8 of the time set by parameter r18.
If a multineedle probe is being used, the test is performed for each probe.
If a multipoint probe is being used, when the test is concluded with a positive result for at least one of the sensors, the
device will function as follows.
- The sensor showing the lowest temperature is then used as the point of reference for heating the needle probe.
- The sensor showing the highest temperature is then used as the reference point for the end of the temp. cycles.
- Any sensors for which the test is not completed with a successful outcome are not subsequently used.
If the test fails to record a positive outcome, or if the needle probe is not inserted, the buzzer sounds and the cycle
automatically changes to time-controlled.
3.6.2 Recording historical data
While a cycle is in progress, records are kept of the temperature values of any probes enabled, output activations,
input status, defrosting cycles carried out and any alarms. Type of logged data can be configurated in Service menu,
data are available for subsequent download to a USB device.
3.6.3 End of a cycle
When the temperature controlled cycle is successfully completed, the core temperature is reached before maximum
time, the conservation phase is activated:
End Cycle -> Holding phase -> Manual Stop->