Teledyne BDS-3960 - Oxygen analyzer - Manual (Page 70)

Appendix BDS 3960
Teledyne Analytical Instruments 70
A-5 Application notes
Pressure and flow recommendations:
3960 series analyzers require reasonably regulated sample
pressures. While the 3960 analyzers are not sensitive to variations of
incoming pressure (provided they are properly vented to atmospheric
pressure), the pressure must be maintained so as to provide a useable
flow rate through the analyzer. Any line attached to sample vent should
be 1/4" or larger in diameter.
Flow rate recommendations:
A usable flow rate for a 3960 series analyzer is one which can be
measured on the flowmeter. This is basically 0.5 - 1.0 SLPM. The
optimum flow rate is 1 SLPM (mid scale). Note: response time is
dependent on flow rate, a low flow rate will result in slow response to
O
2
changes in the sample stream. The span flow rate should be the
approximately same as the sample flow rate.
Cell pressure concerns:
The sensors used in 3960 series analyzers are optimized to
function at atmospheric pressure.
Bypass:
To improve the system response, a bypass can be added to
increase the sample flow rate to the analyzer by a factor of ten. A by-
pass provides a sample flow path around the analyzer of 2 - 18 SCFH.
typically.
Conversons:
1 PSI = 2.04 INCHES OF MERCURY (in. Hg.)
1 SCFH = 0.476 SLPM
Note: The MSDS on this material is available upon request
through the Teledyne Environmental, Health and Safety
Coordinator. Contact at (626) 934-1592