Xylem H-310 - Manual (Page 19)

Chapter 4
Maintenance
H-310
Maintenance 4-1
4.1 Maintenance
Sustained operation is almost maintenance-free. Our experience tells us moisture creates the
largest percentage of field problems. Therefore, monitoring the desiccant is of prime importance.
Desiccant in the H-305 dry air system should be changed periodically, normally every three to six
months.
4.2 H-305 Maintenance Procedure
Regular maintenance of the H-305 desiccant is imperative. Follow this step by step procedure
and refer to Figure 4-1 on the next page to maintain the desiccant.
Step 1- Remove large clear plastic jar.
Step 2- Remove Bladder/Desiccant chamber.
NOTE: You don't have to remove the bladder from the smaller plastic jar.
Step 3- Replace saturated desiccant packs with fresh dark blue packs.
Step 4- Inspect the bladder around the O-ring where it seals against it. If the bladder is torn or
faulty, replace it. Do not substitute with a non-quilted type plastic bag.
Step 5- Shape the bladder until it is approximately half-way inflated. This allows the
bladder to transmit future changes in atmospheric pressure. An under or over inflated
bladder will not transmit the proper atmospheric compensation down the vented cable.
Step 6- Reinstall the clear plastic jar. It will be necessary to gently pull and twist the
bladder at the bottom to clear the jar opening. Inspect around the top of the jar to make
sure that none of the bladder is caught in the threads of the lid.