Ion Science SF6 P1:p - Manual (Page 23)

SF6 P1:p MANUAL Ion Science Ltd
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Setting up the operating parameters
Returning to normal operation can also be effected by operating one of the buttons on the handset or by
(briefly!) pressing one of the On/Off buttons.
- NONE: Standby operation is disabled.
- LIGHT: The screen illumination is switched off. This extends the battery operating time and
conserves the fluorescent lamp behind the screen (service life according to the manufacturer: 10,000
hours).
The instrument remains unconditionally ready for measurements, there is no warning before the
instrument enters the standby mode.
- LIGHT AND SENSOR: Both the illumination behind the screen, the discharge in the sensor as well
as the flow controller are switched off, the operating vacuum is decayed. Thus all system
components, however, the sensor in particular, are spared and above all protected against “silent
wear”. This condition differs from that of a complete shutdown, in that the instrument is capable of
restarting
when picking up the handset.
Before enabling this standby operating mode, a sound signal and a note on the screen with a time
bar are generated. During the running time of the time bar of 20 seconds, it is possible to cancel the
process and return to the measurement mode by moving the handset or pressing one of its buttons.
- POWER DOWN: The instrument shuts down completely. If longer operating brakes are to be
expected, especially in the case of mains independent operation, this setting should be preferred.
Before enabling this standby operating mode, a sound signal and a note on the screen with a time
bar are generated. During the running time of the time bar of 20 seconds, it is possible to cancel the
process and return to the measurement mode by moving the handset or pressing one of its buttons.
Delay for standby operation
( STANDBY DELAY )
Here set up the time after which the standby operating mode is enabled (see section above). Delays of under
approximately 10 minutes should only be selected in connection with switching off the screen illumination
(LIGHT option).
Gas selection
( GAS )
As the gas for the leak detection process, it is here possible to select SF
6
or FM-200. Since the sensitivity of
the P1:p leak detectors for FM-200 is slightly lower, higher calibration factors are permitted here. The
instrument can be calibrated separately for both gases and for this reason when changing the type of gas a
recalibration is not absolutely necessary
Sensitivity for Zero tracking
( Zero Tracking )
Here the way in which the automatic Zero tracking facility operates, can be influenced. Zero tracking is
required so as to compensate for slight changes in the ambient air and the sensor. For setting up the Zero
tracking facility, we recommend the following:
NORM is the default setting which is recommended for all applications with the exception of the special
cases described in the following.
HIGH effects a stronger Zero tracking effect. This setting can be used so as to compensate for greater
background concentration variations or to extend the service life of an already much used SmartSensor. Use
of this setting only when searching for leaks greater than approximately 5 E-7 cc/s or 10 ppm. When using
this setting, there is the risk of suppressing the indication of smaller leaks.
LOW is only available for the HIGHSens instruments. This setting reduces the Zero tracking effect and
improves the response characteristic for very small leaks, respectively concentrations. This advantage is
attained at the expense of suppressing small changes in the background and in the sensor. This setting
should only be used when searching for leaks smaller than approximately 1 E-7 cc/s or 5 ppm and when the
ambient air is substantially free of any background contamination.