Exhaust Vent Requirements - PerkinElmer aanalyst 200 User Manual

Preparing Your Lab

Exhaust Vent Requirements

Exhaust venting is important for the following reasons.
•
It protects laboratory personnel from toxic vapors that may be produced by some samples.
•
It helps to protect the instrument from corrosive vapors that may originate from the
sample(s).
•
It removes dissipated heat produced by the instrument and power supply.
•
It will tend to reduce the effects of room drafts and the laboratory atmosphere on flame
stability.
WARNING
Temperatures
The following temperatures have been measured with a nitrous oxide-acetylene flame: 310 °C at
the vent intake, 160 °C at 2.4 meters (8 feet) from the vent intake, 105 °C at the blower intake,
and 50 °C at the blower motor housing near the front bearing.
To withstand these temperatures stainless-steel tubing must be used.
NOTE: Local electrical codes do not allow PerkinElmer Service Engineers to install the blower and vent
assembly.
Exhaust ducting
Alternatively, smooth stainless-steel tubing should be used instead of flexible stainless steel
tubing where flexibility is not required to reduce system friction loss or "drag." If smooth
stainless steel is used, there must be a way to move the vent hood out of the way for servicing. A
length of smooth stainless steel ducting has 20-30% less friction loss than a comparable length of
flexible ducting. When smooth stainless steel tubing is used, elbows must be used to turn corners.
These elbows should turn at a centerline radius of 150mm with a maximum bend angle of 45
degrees to reduce friction losses, and the number of elbows should be minimized.
You must provide an efficient exhaust venting system to remove heat, toxic combustion fumes
and vapors that can be generated by atomic spectroscopy instruments. We strongly recommend
that you do not place the spectrometer in a chemical hood.
3-12
The use of the AAnalyst 200 without adequate ventilation to
outside air may constitute a health hazard. For example, the
combustion of halogenated hydrocarbons produces toxic
vapors.