8-18 Model 3775 Condensation Particle Counter
upon source of contamination. The orifice fitting is constructed
of 316 SS with an imbedded Sapphire orifice. Orifice
replacement (one orifice supplied) may be required if the
blockage cannot be removed.
Note: TSI replacement orifices have excellent repeatability, and
calibration is generally unnecessary to maintain the basic
instrument flow specification when an orifice is replaced. If
you have a trusted flow reference, you may wish to
calibrate the orifice to improve accuary. A new calibration
data point is entered through the instrument’s serial
communication port. Refer to the section “
Calibrating and
Entering New Orifice Flow Data
”.
8. Apply thread sealing tape or compound and re-install the
orifice.
9. Reconnect the plastic tubing.
10. Verify flow as described earlier.
Figure 8-11
Top View of Instrument Showing Critical Orifice in Optics Block
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