Teledyne 356WA - page 19

4-5

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Operations 4Operations 4

Operations 4

Teledyne Analytical Instruments

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.

4.34.3

4.3 Throttle ValveThrottle Valve

Throttle ValveThrottle Valve

Throttle 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/min150 cc/min

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.

4.44.4

4.4 Humidity ControlHumidity Control

Humidity ControlHumidity Control

Humidity 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.