SERVOPRO NOx Analyzers Page
controlled by a factory-set, precision, electronically controlled proportional flow (EPC)
controller.
If the analyzer does not contain an optional internal sample pump, the sample gas
entering the instrument should be at a pressure between be 3-7 PSIG with a flow capacity
around 0.6 liters/min.
If the analyzer is using the optional sample pump, do not introduce a pressurized sample.
The optional standard pump is capable of drawing a sample through a 6mm (¼-inch)
heated sample line of approximately 75 feet (23m). If the optional zero and span inlets
are present (located on the rear panel) then the calibration Zero and Span gas cylinder
pressures should be set at 25 PSIG.
CAUTION: If the analyzer contains an optional internal sample pump, the
introduction of a pressurized sample gas in excess of 1.5 PSIG will damage
the pump.
Sample Gas Bypass Outlet and Vent
A sample gas bypass outlet connector is located on the analyzer’s rear panel (6mm, ¼-
inch tube). Pressure at this outlet should be kept at atmospheric level. ANY backpressure
will cause an error in reading. The vent outlet is located on the rear panel and may
contain high levels of ozone that should be vented away from the instrument.
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