Ion Science SF6 P1:p - Manual (Page 24)

SF6 P1:p MANUAL Ion Science Ltd
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Setting up the operating parameters
OFF switches the Zero tracking facility off completely and should only be used when searching for
particularly low and/or slowly increasing concentrations. Before each measurement, the Zero level of the
instrument will have to be set manually and there exists no suppression of sensor noise or changes in the
ambient air
Running this option is recommended only under controlled laboratory conditions and it is left to the operator
to decide whether or not it is helpful in connection with the specific application in each case.
Coupling calibration factors (“Cross Mode Calibration”)
(Couple Cal. Fctrs)
The P1:p
leak detectors provide for separate calibration factors for the basic operating modes “Leak rate”
[cc/s, gm/yr] and “Concentration” [ppm]. Normally the final calibration for both operating modes is performed
independently of each other.
By optionally co
upling of the calibration factors (Setting “YES”) it is possible to calibrate the leak detector
through a single final calibration in any operating mode simultaneously for both operating modes. This is
particularly useful when a suitable calibration source for the desired operating mode is not available.
The calibration factor for the second operating mode is here determined through an internal calculation.
Although this calculation is subject to a certain error tolerance owing to the tolerance range of the taken in
quantity of air, the attained accuracy can be considered as sufficient for most applications.
Handshake protocol for the serial interface
( RS232 PROTOCOL )
The handshake protocol is required by the printer so as to indicate to the leak detector its readiness to
receive data. Without this function the data would be received much faster compared to the processing
capability of the printer.
The protocols “CTS / RTS” and “DTR / DSR” are hardware based, i.e. they utilise additional lines of the
interface and for this reason require a connection cable which complies with the RS 232 standard.
In contrast to this, the “XON / XOFF” protocol is software based and utilises only the minimum configuration
for connection cable and serial interface. A three-wire connection cable is sufficient for this.
The serial interface of the leak detector can be set up for all commonly used handshake protocols. Both leak
detector and printer must be set to the same protocol. As to the protocols supported by the printer and how
to set up these on the printer, refer to the corresponding printer manual.
When connecting a computer, the protocol must be set up on both sides to (NONE). Due to the pin
configuration defined by the RS 232 standard a so-called Zero Modem Cable (which is commercially
available) must be used when connecting a computer. When using a standard printer cable, leak detector
and computer cannot communicate with each other.
Reading out technical data
[ TECH. DATA READOUT ]
For all principal components of the P1:p leak detectors, the serial number, the number of operating hours
and further data is indicated which are mostly intended for servicing. If this data is of interest to the users,
this is pointed out in the corresponding section of this Instruction Manual. Therefore only a brief description is
provided here.
Technical data of the base unit
[ TECH. DATA READOUT ] / [ CONSOLE ]
The following information is available:
01 Serial Number ...................... : Serial number of the base unit