Oxygen Analyzer Installation
Teledyne Analytical Instruments 33
If greater sample flow is required for improved response time,
install a bypass in the sampling system upstream of the analyzer input.
SPAN IN: Span gas is connected to this port and it is automatically
routed by solenoid valves when the analyzer goes into the span mode. Its
pressure should be about the same as the inlet pressure of the sample
gas. This will ensure that flow remains unchanged when switching
between calibration and sample gases and this in turn increases accuracy
of the calibration.
EXHAUST OUT: Exhaust connections must be consistent with the
hazard level of the constituent gases. Check Local, State, and Federal
laws, and ensure that the exhaust stream vents to an appropriately
controlled area, if required.
CAUTION: CONNECT VENT LINES TO 1/4” OR LARGER
DIAMETER TUBING.
AIR INLET: The solenoid valves of the sampling system need air
pressure to actuate them. Use the compression fitting and 1/4” tubing to
connect instrument air (compressed air) with pressure in the range of 70
to 80 psig.
CAUTION: PRESSURE HIGHER THAN 100 PSIG CAN DAMAGE
THE SOLENOID VALVES.
3.3.2 Electrical Connections
For safe connections, no uninsulated wiring should be able to come
in contact with fingers, tools or clothing during normal operation.
CAUTION: USE SHIELDED CABLES. ALSO, USE PLUGS THAT
PROVIDE EXCELLENT EMI/RFI PROTECTION. THE
PLUG CASE MUST BE CONNECTED TO THE CABLE
SHIELD, AND IT MUST BE TIGHTLY FASTENED TO
THE ANALYZER WITH ITS FASTENING SCREWS.
ULTIMATELY, IT IS THE INSTALLER WHO ENSURES
THAT THE CONNECTIONS PROVIDE ADEQUATE
EMI/RFI SIELDING.