Teledyne 3110 operating instructions Portable Trace Oxygen Analyzer Installation

and calibration gas. For atmospheric pressure sampling, connect a pump and flow control valve downstream from the analyzer and draw (rather than push) the sample through the instrument.

IMPORTANT: IF A PRESSURE REGULATOR IS USED, IT MUST HAVE A METALLIC DIAPHRAGM. REGULATORS WITH ORGANIC OR PLASTIC DIAPHRAGMS ARE PERMEABLE TO OXYGEN AND, IF USED IN THE SAMPLING SYSTEM, WILL LEAD TO HIGH OXYGEN READINGS.

The instrument is shipped with a gas sampling and calibration kit. This includes a 12” piece of clear tubing with a quick disconnect line for use as a sample return or vent line plus 2 quick disconnect fittings to be installed on the sample and calibration lines. These fittings employ ¼” tube fittings which can be removed to reveal a 1/8” NPT internal thread.

It is important in trace analysis applications to use metal for all

wetted components of the sample system. This includes gas lines, filters, pump housing, diaphragms and any components in contact with the sample gas. Plastic tubing and parts will result in slow and inaccurate measurements at the ppm level.

There are two quick disconnect fittings installed on the rear panel for mating the instrument with the sample or calibration gas and the vent line. As shown in Figure 2-1, each fitting has a button which when depressed allows the rapid detachment of the gas line from the instrument. It is not necessary to press the button when inserting the line, just push the male fitting into the mating connector. When a line is removed, an internal seal prevents gas escape from the female sections of the fitting.

To avoid pressurizing the sensor, the vent line should be installed first and removed last.

In setting up the sample lines, any valves used to set the sample flow or filters must be located on the sample in line. Do not place any valves or restrictions on the vent line except as noted above for atmospheric pressure sampling when using a downstream pump. Doing so would increase the sensor operating pressure and result in inaccurate analysis.