Micro-GASS Maintenance Instructions

Flow Rate - The system should be checked daily for proper flow rate.

Coalescing Filter Element - The filter element should be checked regularly to ensure that the element is in good condition. If the filter is dirty or causing a flow restriction, replace the filter element.

1. Remove the filter cap and element
2. Inspect the o-ring for damage and replace if necessary
3. Fit the new filter element to the raised portion of the filter cap and replace the filter cap
4. Tighten until snug. Do not over-tighten.

Dryer Element Replacement - Under the operating conditions specified, the Nafion dryer element should last for several years. However, should the element become wet, clogged, or dirty it may require replacement.

1. Disconnect the system power source.

2. Remove the four (4) screws from the filter housing flange.
3. Open cover and lift control panel to gain access to the system components.
4. Remove two (2) nuts from the sample inlet tee fitting as shown in Figure 1.
5. Rotate the tee fitting counterclockwise and remove it from the heater sleeve.
6. While holding the filter heater sleeve from the inside of thee enclosure, remove the Kynar™ filter housing from the outside by turning counterclockwise until it can be pulled out.
7. Remove nut and union from the outlet end of the dryer as shown in Figure 2.
8. From the outlet end, carefully push the element into the housing until the end of the element clears the o-ring.
9. Remove the o-ring.
10. Grab the element from the filter end of the dryer and gently pull until the element is free of the housing. See figure 3.
11. Remove the element and o-ring from the housing.

Figure 1- Sample inlet tee

Figure 2 - Nut and union

Figure 3 - Filter end

Element Installation

1. Always wear gloves when handling the element to prevent skin oils from contaminating the membrane surface.
2. Remove the nut from the tee fitting at the outlet end of the dryer.
3. Remove the bend clop from the dryer housing tube and straighten the tube to allow the element to slip in more easily.
4. Slip two of the new o-rings onto one end of the new element.
5. Install the other end of the element into the filter side of the dryer housing by gently pushing the element into the housing. Be careful not to kink the tubing. As the element approaches the end of the dryer, it may be necessary to flex the dryer housing to line up the end of the element with the hole in the tee fitting. Allow 1/4" to protrude from the end of the tee fitting. See figure 4.

   Figure 4 - Tee fitting

6. end of the tee fitting. See figure 4.
7. Install the third o-ring seal around the end of the element and gently push it into the recess of the tee fitting.
8. Install the union and hand tighten, followed by a 1/4 turn with a 5/8" wrench.
9. Install the two (2) nuts on the tee fitting and tighten by hand.
10. Replace the tube bend clops.
11. Install the filter housing by again holding the filter heater sleeve from the inside of the enclosure and lining up the union threads with the element and tee fitting end of the dryer. Some flexing of the dryer heater sleeve may be necessary to line up the threads. Do not cross thread the union! When threads are lined up properly, virtually no resistance will be felt until the union contacts the o-ring seal. Turn the filter housing until tight and the purge port is visible through the hole in the heater sleeve.
12. Apply new Teflon tape to the tee fitting and thread it into the purge port. Do not cross thread the port!
13. Install the two (2)  nuts on the tee fitting and tighten by hand.
14. Install the four (4) screws in the mounting flange.