Teledyne 514 - NDIR analyzer - Manual (Page 26)

3–2
3.0 Installation
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
sis. TAI recommends that a bypass filter assembly in the sample loop be
installed.
Figuire 3-1. Sampling Considerations
3.2.2 Effluent Return
Returning the sample effluent to the process may require a separate
calibration fluid return so that the calibration fluids can be kept out of the
process during standardization periods.
3.2.3 Flow Control
A differential pressure regulator is often used in TAI systems across the
sample flowmeter and needle valve control to give a constant flow, regard-
less of upstream or downstream pressure fluctuations. Constant flow may or
may not be important, depending upon the application.
It is necessary to insure sufficient contact of the sample with the
preheater in order to bring the sample up to the control temperature. Do not
allow flow in excess of 50 ml/minute.
For liquid applications, TAI recommends that the throttle valve and
flowmeter always be downstream from the analyzer. Such an installation
will pressurize the sample cell and eliminate bubbles in the sample.
Bubbles suspended in the sample fluid will produce erratic, ambiguous
analysis of the sample.
Analyzer Flow Cell
Sample Inlet
Regulator
Bypass Valve
Sample
Flowmeter
Diff. Regulator
Ring Manifold
Bypass
Flowmeter
Sample Outlet
Filter installed only
when required
Sample
Zero Fluid
Span Fluid
Cell Drain
Calibration
Fluid Return
Sample Return