FRM O-Ring Kit Installation

Purpose: Replacing these o-rings help ensure leak free operation of the instrument.

Required Equipment: O-Ring seal kit (R&P Part # 59-005515)

References: Service Manual, Parisol Plus Model 2025 Sequential Air Sampler

Note: All instrumentation not in RUN mode should have the appropriate channels DOWNED in the site manager software for data management purposes.

Inspection and Replacement of O-Rings

Perform the following steps to check the O-rings and “V” seals:

1. Ensure the instrument is not sampling and is in STOP mode.
2. Enter Service Mode.
3. Move the pointer so that it points to “Manual Motion Tests” on the Service Menu and press <F4:FiltChg> to go to the Filter Exchange Screen (Figure 3-2).
4. On the Filter Exchange Screen, turn on the pump (labeled “Pump”), turn on the pressure vent valve (labeled “Pressure”) and turn on the lift/push valve (labeled “LiftPush”). This will cause the lift/push cylinder (the middle cylinder on the filter exchange assembly) to retract and will help ease disassembly.

Figure 3-2.

Figure 3-3.

5. Unlatch and open the top cover of the Partisol-Plus Sampler with the down tube and first-stage inlet attached to gain access to the WINS Impactor (Figure 3-3).
6. Replace the three o-rings that reside within the PM10 head.
7. Lift the WINS Impactor out of the upper part of the sampler enclosure and replace the three o-rings that reside within it (Figures 3-4 and 3-5).

Figure 3-4.

8. Locate the down tube mount on the top cover. (Figure 3-3) While supporting the ring on the underside of the top cover, remove the four screws which secure the down tube mount to the top cover. Remove the down tube mount and ring. Remove the down tube from the mount by lessening the large nut and pulling tube straight out. Replace the two o-rings inside the mount ring and reassemble down tube to mount ring.
9. Locate the down tube mount “V” seal. (Figure 3-6) Examine seal for drying and/or cracking. Replace, if necessary. (Down tube mount “V” Seal: R&P Part number 23-004576)
10. Replace the down tube mount and ring onto the top cover ensuring that the side of the ring with the chamfer (See Figure 3-6) is facing down (towards WINS impactor and the inside of the enclosure).
11. Locate the top head mounting plate. (Figure 3-5) Note whether this plate is made from aluminum or Lexan (clear plastic) to the filter exchange assembly.
12. If the top head mounting plate is Lexan, remove the ground wire from the top head and from the exit cylinder base.
13. Remove the 4 thumb screws which secure the top head mounting plate to the filter exchange assembly. Lift the plate (with the top head attached) and remove from the enclosure.
14. Locate the two “V” Seals now exposed. (Figure 3-7) The top seal is located in the top head. The bottom seal is located in the now exposed section of the filter exchange assembly. Examine both seals for drying and/or cracking. Replace, if necessary.

(Bottom “V” Seal: R&P Part number 23-002182)

(Top “V” Seal: R&P Part Number 23-004276)

Figure 3-5.

Figure 3-6.

Figure 3-7.

Figure 3-9.

15. Locate the exit cylinder. (Figure 3-5) Remove the three screws which secure the exit cylinder base to the filter exchange assembly. Remove assembly from enclosure.
16. Locate the exit cylinder “V” seal. (Figure 3-8) Examine seal for drying and/or cracking. Replace, if necessary. (Exit cylinder “V” Seal: R&P Part number 22-002959)
17. Place the exit cylinder base in its proper position on the filter exchange assemble and secure using the three screws previously removed.
18. Replace the top head mounting plate and secure using the four thumb screws previously removed.
19. Replace the WINS Impactor and close the top cover.
20. On the Filter Exchange Screen, and turn off the lift/push valve (labeled “LiftPush”), turn off the pressure vent valve (labeled “Pressure”) and turn off the pump (labeled “Pump”).
21. Perform an external leak test according to the procedure outlined in section 3.2.7.
22. Resume normal operation.