MAINTENANCE Teledyne API M701H High Performance Zero Air Generator
6-6 06712B (DCN5875)
Observe that the LED starts blinking at 11.2 mV (300ºC) and that the thermocouple
voltage holds steady.
14. When all traces of water have disappeared from the M701H output, the output may
be reconnected to the analyzers.
It is unlikely that the Regenerative Dryer should ever need service. Should the
molecular sieve become contaminated by oil or other external contaminants, the
scrubber will need to be cleaned and recharged. Refer to Figure 6-1.
1. Turn off and unplug the M701H, plug in and turn on again and remove any water in
bowl.
2. Allow the pressure to bleed to zero.
3. Remove the two pneumatic connections and the electrical connection from the 4-
way manifold.
4. Remove the dryer from the chassis by undoing the four captive screws in the
scrubber base.
5. Remove the 4-way valve bracket from the upper manifold and let the valve hang
loose attached to the lower manifold.
6. Remove the three nuts on top of the upper manifold.
7. Remove the upper manifold.
8. Remove the two columns.
9. Remove the retainer pads from the two columns and dump the molecular sieve into
a suitable waste receptacle. (The molecular sieve is not toxic but it may be dusty so
you may want to wear a mask.)
10. Wipe out the inside of the columns with a clean dry rag.
11. Examine the surface and ports in the upper and lower manifolds. If there is an
accumulation of dirt or corrosion, disassemble the manifolds and clean them. If not,
proceed with step 12.
12. Place two new clean retainer pads in one end of each column. Push the pads 1/8”
into the column.
13. Pour new clean molecular sieve into each column, up to 1/4” from the top. Rap the
side gently, (with a screw-driver handle, for instance) to settle the molecular sieve,
and then top up to the 1/4” mark again.
14. Place two new clean retainer pads on top of the molecular sieve. Push the pad 1/8”
into the column.
15. Change the four o-rings in the circular grooves in the upper and lower manifolds.