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3.3.3 H2S Scrubber
The life expectancy of the stainless steel H2S scrubber, in- cluded in this system, is determined by the amount of H2S passing through it.
With the maximum concentration of 200 PPM H2S and a flow rate of 0.2 scfh the expected scrubber life will be over 6 months with Purifil® and over 11 months with Purifil® II.
This scrubber life expectancy increases with lower H2S con- centration or gas sample flow rates. It is recommended that the flow rate be set no higher than 0.4 scfh initially. The flow rate should be increased only if a faster system response time is de- sired.
It is suggested that a spare scrubber be kept on hand and replaced every 6 months. When the scrubber needs to be re- placed, follow the procedure in section 4, Maintenance, "Scrub- ber Replacement".
WARNING: IF SCRUBBER IS NOT PROPERLY MAINTAINED THE
O2 SENSOR LIFE WILL BE SHORTENED.
3.3.4 Exhaust/Vent Line (Sample Return)
It is recommended that a long vent line (approx. 4 ft.) be installed to the "Sample Return" connector at the side of the sys- tem enclosure. The extended vent line will minimize back diffusion from the atmosphere back to the sensor. The minimum recom- mended tubing diameter is 1/4" to minimize back pressure.
3.4Testing the System
Before connecting the instrument into the power source:
•Check the integrity and accuracy of the gas connections. Make sure there are no leaks.
•Check the integrity and accuracy of the electrical connections. Make sure there are no exposed conductors.
•Check that inlet sample pressure is within the acceptable range (see section 3.3.1).
•Power up the system, and test it.
Teledyne Analytical Instruments |