Teledyne 356WA instruction manual Throttle Valve, Humidity Control

Trace Oxygen Analyzer Operations 4

6)Connect the red lead to the center terminal and the black lead to the outer terminal.

NOTE: The silver screens in the cell have been specially treated to pro- vide proper detection characteristics. They must be kept clean and MUST NOT be touched. Even clean fingers secrete natural oils which contaminate the screens. If the screens need straightening, wash a small pair of tweezers thoroughly to remove any grease, rinse them in distilled water, and use them to carefully bend the screens back into place.

4.3Throttle Valve

The throttle valve is located at the top of the reservoir tank. Refer to Figure 4-1.

1)Gently turn the valve counterclockwise. A stream of bubbles should appear at the base of the humidifier column, and the float of the flowmeter should rise in its tube.

2)Adjust the valve so that the flowmeter float is centered in the flow rate reference indicator.

CAUTION: Open the throttle valve carefully. Excessive flow rate may cause water in the humidifier column to be carried into the detector cell. This can cause erratic readings and may require disassembly, cleaning, and refilling of the sensor.

3)The flowmeter indicator has been factory set to a flow rate of 150 cc/min. for the specified sample gas.

CAUTION: Excessive flow rate may cause water in the humidifier to be carried to the flowmeter causing moisture to accumulate. This can cause the ball to stick in the flowmeter. To remove moisture, remove the flowmeter and allow to air or blow dry. Refer to the detailed in- structions in Figure 5-2 for removal and installation of the column.

4.4Humidity Control

The humidity control is located on the front panel of the control unit, and is adjusted to maintain a constant electrolyte level in the detector cell. In effect, the control governs the humidity of the sample which is directed to the cell.

Teledyne Analytical Instruments 4-5