Appendix M: Touch RAM
Page M-6 Lasair II Particle Counter Operations Manual
Particle Alarms and Touch RAM Buttons
When reading a button with the Lasair II particle counter, ensure that the button was
written with a Lasair II particle counter instead of another monitor. Particle alarms
are written and read in the buttons for each channel. A Lasair II particle counter’s
reading alarm settings based on a Lasair II particle counter 510 will set the alarms
on a channel by channel basis. That is, the first channel alarm on the Lasair-510
particle counter (0.5 µm) is read as the first channel alarm on the Lasair II-310
particle counter (i.e., 0.3 µm).
Touch RAM Buttons Written on Other Instruments
Touch RAM buttons that are written and read on different types of instruments may
not give the results expected. The Touch RAM buttons do not contain any
information about the particle sizes and flow rate of the instrument:
• Particle sizes – Buttons do not contain any information about the particle sizes
of the instrument. Particle alarm values are stored in a six-channel array.
Reading back these values in an instrument with different size channels will give
different alarm settings. This is true even if the instruments are in a two-channel
pharmaceutical mode (0.5 and 5.0 channels only).
• Flow rate – Buttons do not contain any information about the flow rate of the
instrument. The sample size is saved as a volume. Therefore, the volume read
and written is preserved, but the time is not saved. For example, if a Touch RAM
button is written using a Lasair II-310A particle counter and then read with a
Lasair III-550L particle counter, a shorter sample time will result, but the sample
volume will be the same. The particle alarm settings are then affected by these
differences. The settings will also be affected by the use of raw data rather than
normalized data.
Touch RAM Buttons with TCP/IP Address
In facilities with Pharmaceutical Net software, data sampled at various locations
can be conveniently downloaded to Pharmaceutical Net, and then analyzed and
archived. In large facilities with several Pharmaceutical Net installations, it may be
beneficial to be able to automatically change the TCP/IP address of the Lasair II
particle counter when it is moved from one Pharmaceutical Net area to another.
Touch RAM buttons can have a TCP/IP address programmed in them, which
facilitates this capability.
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