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PTB150-MAN-V14.0
PTB 150-157 Instruction Manual
3 - GENERAL RECOMMENDATIONS
➔
ATTENTION
The
processor regulator has been configured in factory with the parameters suited
to work in the respect of the technical specifications.
Don’t change these parameters to avoid malfunction or breaking of the
calibrator
with risks of serious personal injury.
- Position of the probe:
To obtain the best result, follow the advises:
•
Measure the diameter of the probe being checked.
•
Use the reduction insert; check that the diameter of the hole is at least 0.3mm bigger than the
diameter of the probe (figure1).
•
Put the insert in the equaliser block only at ambient temperature, using the tweezers.
•
Avoid using holes that are too accurate and do not force the probes into the block.
•
Insert the probe up to the bottom of the block: the sensitive element is in the optimal calibration zone
(figure 2)
•
Calibration with a reference: take care to position the two probes, the standard one and the
calibration one, at the same dept and as close together as possible (figure 3).
•
Always verify the range of the probes to be calibrated before using; the maximum temperature
of the probes should be higher then the temperature of the liquid otherwise the probe could
break.
- Advises:
•
The temperature difference is proportional to the difference between the diameter of the probe
and the diameter of the hole.
•
Do not insert the probe when the instrument has already reached the set temperature; thermal
shock causes instability and breakage of the sensitive element.
•
For the calibration of temperature transducers with special execution, call our technical office
and ask for equaliser blocks with special drillings.
•
Inserting a 6mm diameter 20°C probe at 121°C takes about 10 minutes to achieve maximum
stability.
•
To reduce the errors it is advisable to insert the probes and the standard probe together in the
insert, if you insert the standard probe in the side hole and the probes in the insert the error at
121°C is about 0,2°C
Fig.1
Fig.3
Fig.2
