DOC-0171 Rev G-9
2 5
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
Figure 18: Interlock Jumper
Caution:
If the laser turns off because an interlock switch was disengaged, the laser will automatically
turn on again when the interlock is re-engaged. Note that this result differs from that found with Rev. C of
the SP2. In that version of the instrument, if an interlock switch becomes disengaged, the laser does not
automatically turn on when the interlock is engaged again. Rather, the user must first turn laser power
off and then on again in the software.
7.0
Routine Maintenance
The only routine maintenance that the SP2 requires is to periodically refresh or replace the
desiccant in the drying cartridge on the purge line. If the desiccant becomes saturated and the SP2
is operated in a very humid environment, condensation could build up in the purge line and
possibly contaminate the flow controllers, which can cause them to fail.
An occasional particle zero check is also recommended; this is done by placing a HEPA or other
high-efficiency filter on the SP2 inlet. After a few minutes, the instrument should record an
occasional particle, but effectively the particle concentration measurement should be zero. If not,
contact DMT for support.
If the SP2 is operated in a highly particle-laden environment, it may be necessary to check the
calibration of the laminar flow element (LFE) on the sample inlet.
