Analytical-industries GPR-1500 A Series Trace PPM Oxygen Analyzer Manuel d'utilisateur télécharger pdf (Page 7)

Advanced Instruments, Inc

Materials: Assemble the necessary zero, sample and span gases and optional components such as valves,

coalescing or particulate filters, and pumps as dictated by the application. Stainless steel tubing is essential

for maintaining the integrity of the gas stream for low % or PPM O

level analysis.

Operating Temperature: The sample must be sufficiently cooled before it enters the analyzer and any

optional components. A coiled 10 foot length of ¼” stainless steel tubing is sufficient for cooling sample

gases as high as 1,800 ºF to ambient. The recommended operating temperature is below 35 ºC. However,

the analyzer may be operated at temperature up to 45 ºC on an intermittent basis but the user is expected to

accept a reduction in expected sensor life –as a rule of thumb, for every degree ºC increase in temperature

(above 25 ºC), the sensor life is reduced by approximately 2.5%.

Heat: Situate and store the analyzer away from direct sources of heat.

Liquid and Object Entry: The analyzer should not be immersed in any liquid. Care should be taken so that

liquids are not spilled into and objects do not fall into the inside of the analyzer.

Handling: Do not use force when using the switches, knobs or other mechanical components. Before

moving your analyzer be sure to disconnect the wiring/power cord and any cables connected to the output

terminals of the analyzer.

Sample Pressure and Flow

All electrochemical oxygen sensors respond to partial pressure changes in oxygen. The sensors are equally

capable of analyzing the oxygen content of a flowing sample gas stream or monitoring the oxygen

concentration in ambient air (such as a confined space in a control room or an open area around a landfill or

bio-pond). The following is applicable to analyzers equipped with fuel cell type oxygen sensors.

Analyzers designed for in-situ ambient or area monitoring has no real sample inlet and vent. The sensor is

exposed directly to the sample gas and it is intended to operate at atmospheric pressure. The analyzer has

a built-in pressure sensor and the sensor output is automatically compensated for any atmospheric pressure

changes.

Inlet Pressure: For the analyzers designed to measure oxygen in a flowing gas stream, the inlet

sample pressure must be regulated between 5-30 psig. Although the rating of the SS tubing and tube

fittings/valves itself is considerably higher (more than 100 psig), a sample pressure of 5-30 psig is

recommended for ease of control of sample flow.

The analyzer equipped with a sample system has designated SAMPLE and VENT ports. Connect SAMPLE

gas to SAMPLE and the vent to the VENT ports only.

Caution: If the analyzer is equipped with an optional H2S scrubber, sample inlet pressure must

not exceed 30 psig.

Outlet Pressure: In applications where sample pressure is positive, the sample must be vented to an

exhaust pipe at a pressure less than the inlet pressure so that the sample gas can flow through the sensor

housing. Ideally, the sample must be vented to atmospheric pressure.

Note: The sensor may be used at a slight positive pressure (e.g., when sample is vented to a common

exhaust where the pressure might be higher than 1 atmosphere). However, the pressure at the sensor must

be maintained at all times including during the span calibration. This may be accomplished by using a back-

pressure regulator at vent line of the analyzer. Caution: A sudden change in pressure at the sensor may

result in the sensor electrolyte leakage.

Flow rates of 1-5 SCFH cause no appreciable change in the oxygen reading. However, flow rates above 5

SCFH may generate a slight backpressure on the sensor resulting in erroneous oxygen readings.

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Analytical-industries GPR-1500 A Series Trace PPM Oxygen Analyzer Manuel d'utilisateur Page 7

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