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700M HFID
6-2-15
20
Sampling Requirements
Filtration
The 700M HFID contains an internal 0.0
1
micron filter in the sample input. It also has 0.7
micron filters on each of the air, fuel and optional zero/span gas solenoid valves. The final filter
must be capable of removing any particles larger than 4 microns.
Condensation
The analyzer is designed to measure hot wet (raw) sample gases. Unheated sample lines (or cold
spots in heated lines) will cause the moisture contained in the sample gas to condensate. Any
liquids entering the analyzer could damage it.
The dew point of the sample gases must be lower than the instrument temperature to prevent
accidental condensation within the instrument. If necessary, bypass the sample through a
dehumidifier to reduce the dew point to 4°C or less. If the sample contains an acid mist, use an
acid-mist filter, cooler or similar device to remove all traces of the mist.
Presence of Corrosive Gases
The useful service life of the instrument will be shortened if high concentrations of corrosive
gases such as Cl
2
, SO
2
, F
2
, HCl etc. are present in the sampled gas.
Gas Temperature
The 700M HFID temperature is factory set at 191ºC unless specified otherwise by the customer.
When measuring high-temperature gas streams, do not exceed the instrument’s maximum
temperature rating of 410ºF (210ºC).
Pressure and Flow Rates
The sample gas flow entering the instrument is regulated by an electronic proportional control
(EPC) valve to ensure that constant pressure is maintained at the sample capillary. The pressure
is factory set for optimal analyzer performance. The fuel and air entering the instrument are also
controlled by a factory-set EPC valve. The supply pressures should be set at approximately 25
PSIG.