Perma Pure Micro-GASS UG-1212 - Manual (Page 14)

6. Switch “Pump Power” switch to the “ON” position. To prevent wet sample gas from
entering the unheated dryer, the sample pump is powered via the temperature controller.
A relay in the temperature controller remains open until the system temperature comes
to within 5°C of the setpoint at which point, the pump will turn on. The system will require
less than 5 minutes before the operating temperature is reached but pleas allow about
15 minutes for the balance of the system to come to a stable temperature.
7. Slowly open the valve on the flow meter by turning counterclockwise, adjust the flow to
the desired rate (0.5 to 1 lpm). Lower flows result in dryer gas samples. Samples with a
dew point of greater than 35°C should be run at no more than 0.5 lpm.
Shutdown
1. To prevent wet gases from condensing in the Nafion dryer, follow this procedure to
purge wet sample gas from the system before shutting down.
2. With system and pump power switches both in the “ON” position remove the filter cap
from the bottom of the enclosure (Check condition of the filter element.)
3. Allow the pump to run for about two minutes.
4. Turn the power switches to the “OFF” position and replace the filter cap.
5.0 Maintenance and Repair
Periodic checks
Sample Gas Flow Rate
Check daily for proper flow rate in the range of 0.5 to 1.0 lpm
Sample Gas Filter
Check frequently for excessive buildup if particles on the outside of the element or if a
noticeable loss of gas flow is detected and can not be adjusted with the flow meter needle valve.
Coalescing Filter Element Replacement
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 new filter element to raised portion of the filter cap and replace filter cap.
4. Tighten until snug, do not overtighten.
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