ATI Technologies B12-69 O & M Manual - Page 11

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Model B12-69 Wet Oxidant Gas Transmitter

WET OXIDANT GAS SENSOR ASSEMBLY

Wet oxidant sensors require service prior to operation. Sensors are shipped dry. Prior to start-

up, a new membrane must be installed and the sensor must be filled with electrolyte. Figure 8 shows an

exploded view of the sensor.

Figure 8 - Wet Oxidant Gas Sensor Assembly (ATI-0265)

Follow the procedure below to prepare the sensor for operation:

1. Unscrew the electrolyte chamber from the assembled sensor and also remove the fill screw and o-

ring from the side of the sensing element.

2. Remove the front nut from the bottom of the chamber and discard the protective membrane. O-rings

are contained in grooves on both the bottom and top of the chamber. Be sure that these o-rings

remain in place.

3. From the package of membranes supplied with the sensor, place a new membrane into the front nut.

The membrane is the white disk and is separated from other membranes by a blue paper

spacer.

4. Screw the front nut onto the chamber until you feel the o-ring compress. Hand tight compression is

all that is needed. Do not use tools to tighten. The membrane should be flat across the bottom of the

chamber without wrinkles.

5. Fill the chamber with electrolyte until the level is about ½" above the bottom of the internal threads in

the chamber.

O & M Manual

Rev-G, 7/15

SENSING ELEMENT BODY (02-0016)

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