When the sensor is inserted into a liquid or gas the heated RTD is strongly affected by the velocity of the medium. Flow past the heated RTD changes the heat transferred from the surface of the sensor. This cooling effect reduces the temperature of the sensor. The Innova-Switch™compares this change to a preset flow trip point to switch the output. Figure 2B shows the model FS4200 signal change vs. flow rate for air, light hydrocarbon liquids, and water.

The signal change vs velocity has the same general shape for all three media but the change is larger for air and the sensitive range is different for each. For air and most gaseous media the range is 0.1 to 500 feet per second (FPS). For most liquid media the range is 0.01 to 5 FPS. Appendices in section 9.0 contain flow conversion information to facilitate conversion from various units and pipe dimensions into flow velocity in feet per second.

Gas Or Liquid Flow

For a no flow condition the thermal differential between the two tips is high because of relatively low heat transfer.

Note: The fluid velocity and heat absorption ability determine the differential between the tips. Their combination determines the measurable velocity. In water velocities from 0.01 to 5 FPS are measurable, whereas in air velocities of

0.1to 500 FPS can be measured.

Flow across the tips decreases the thermal differential because of the higher heat transfer of flowing fluids. This differential is compared with the trip point.

When the lower differential matches the customer select flow velocity trip point (set point) the switch relay and red LED are tripped.

When flow is above the trip point the differential is smaller than at the set point and the

relay and Led remain tripped.

IM-215 Rev-A.1

Series Innova-Switch™

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Sierra 215 manual Gas Or Liquid Flow
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215 specifications

The Sierra 215 is a state-of-the-art vehicle that exemplifies modern engineering and innovative technology. Designed for a diverse range of applications, the Sierra 215 seamlessly combines power, comfort, and efficiency, making it an ideal choice for both personal and commercial use.

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Overall, the Sierra 215 represents a perfect blend of performance, technology, and comfort. Its forward-thinking design and advanced features make it a standout option in the competitive vehicle market. Whether used for work or leisure, the Sierra 215 delivers on every front, promising reliability and satisfaction for years to come.
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