CDP301 Dew-Point Tester User’s Manual
32 97585 Issue 1, June 2020
SYSTEM START-UP
6. Reduce the mirror temperature in 5°C (9°F) steps (waiting for the mirror
temperature to reach the setpoint between steps) until a visible change
in the image has occurred.
7. Increase the mirror temperature in 5°C steps (9°F) (again waiting until
the mirror temperature has reached its setpoint between steps) until the
visible dew has disappeared.
8. In manual mode set the step size to 1°C (1.8°F).
9. Repeat steps 5 and 6 with 1°C (1.8°F) steps.
10. Set the instrument to auto mode with a 0.5°C (0.9°F)/min ramp rate. This
is the ASTM D1142/ISO6327 standard ramp rate.
11. Set the temperature to reducing and record the temperature at rst signs
of dew forming.
12. Set the temperature to increasing and record the temperature when all
signs of dew have disappeared.
13. The dew point is calculated as the average of the forming and evaporation
temperatures as per the standards.
Tips:
By changing between the two Dew-Point Type modes (red and white illumination) when
observing precipitation on this mirror surface the user can determine if the dew point
observed is that of pure hydrocarbon, pure water/ice or a combination of both occurring
simultaneously at the same analysis pressure and mirror temperature.
4.2 System Shut-Down Procedure
This procedure must be carried out prior to carrying out any maintenance or servicing.
Proceed as follows:
1. Press and hold the Power button; the CDP301 will go through a quick
heating cycle to clean the mirror before shutdown.
2. CLOSE the Sample Isolation Valve to shut o the sample gas supply to
the system.
3. Allow the system to vent and depressurize.
NOTE: If for any reason there is a software ‘lock up’ with the instrument still powered
on, it is possible to carry out a reset. To do this reset, depress and hold the four
navigate and select buttons simultaneously (not the power button).
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