Ion Science GasCheck Tesla - Manual (Page 16)

GASCHECK TESLA MANUAL Ion Science Ltd
Page 16 of 25
Unrivalled Detection. www.ionscience.com
GasCheck Tesla fan current montior
Even with magnetic shielding in place, in the presence of strong magnetic fields, the fan inside the
GasCheck Tesla will degrade. This degradation is permanent and results in the current drawn by the fan
increasing.
There are also temporary effects where the local magnetic field will cause the current drawn by the fan to
increase. These effects disappear when the instrument is removed from the magnetic field.
The software inside the GasCheck Tesla prevents leak detection measurements from being taken when the
fan is permanently damaged, or if the local field is too high.
The GasCheck Tesla can monitor the current consumed by the fan as it draws air through the detector
chamber. This allows the end user to see how much damage has occurred to the fan inside the unit due to
the magnetic field. If the current is too high, the unit displays an error message preventing the operator from
making measurements of the leak rate.
Refer to
Figure 6 . The fan current indicator can be found in the bottom left hand corner of the 'Zeroing'
screen. The number can range from around 200 units or below on a new unit and can rise to 600 units
before the unit displays the error message shown in
Figure 7 . The 'Zeroing' screen can be accessed at any
time by holding down the ' ' key and zeroing the GasCheck Tesla.
Once the error message is displayed, it will remain on the screen until the ' ' key is pressed and the fan
current has returned to an acceptable level. In the event of the fan current constantly exceeding 600 units,
for example if the GasCheck Tesla fan has reached the end of its working life, the unit will not display the
leak rate and the GasCheck Tesla should be returned to Ion Science for servicing.
Figure 7 – Fan current limit exceeded indicator
Figure 6 – Fan current indicator