Heath Consultants Odorator - Manual (Page 6)

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When the ODORATOR is turned on, the user might momentarily
notice the letter “L” on the LCD when the READ switch is depressed
and held down. If the “L” fails to disappear, it may be an indication
of blower speed. The “L” indicates a speed problem, and if on, the
Odorator should not be used.
When it is time to replace the batteries, “LO BATT” will be indicated in
the upper left corner of the LCD when the READ switch is depressed
and held down.
The ODORATOR is designed and intended to be used in accordance
with the GPTC Guide For Gas Transmission And Distribution Piping
Systems, (49 CFR) 192.625 Subpart L, dated 10-15-03 and the
American Society For Testing And Materials Standard D 6273 - 08.
Supply gas must be natural gas (methane) of high quality. Blended
or mixed gases as sometimes found during peak shaving cannot be
tested using the ODORATOR.