Ion Science GasCheck IS - Manual (Page 16)

GASCHECK 3000 & 3000IS MANUAL Ion Science Ltd
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Operation
Display
General
The display is arranged to show the leak rate and other status including user changes to the settings.
• In normal use the upper portion of the display is used for a large size digital representation of the
leak rate (see Section 4.2.2) and status information is shown as symbols (see section 4.2.3)
appearing in the lower portion. The Gas Group or the gas chosen will show on the lower right hand
side of the display.
• In response to key presses, written text will appear confirming the changes to settings.
Examples are:
• Zeroing detector
•
Nozzle On
• Peak hold On
• Nozzle off
• Peak hold of
•
He
• Group 0
•
Contrast darker
• Contrast lighter
Leak rate indication
Leakage is displayed as a single (signed) digit x 10 (signed) range for ease of interpretation and calibration.
[Note that some gases (e.g. CO2 and R134a) may cause a negative leak indication after GasCheck zeroing
in clean air. See the Positive/Negative column in Table 4]
Examples are:
Leak rate for a positive gas:
5 x10 -5 ml / s
Leak rate for a negative gas:
- 3 x10 -4 ml / s