Test Your Knowledge: Thermal Flow Switches

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* 1. In what types of fluids can thermal flow switches be used?

Air

Water

Crude Oil

Gases

Vegetable Oils

Hydrocarbon Fuels

All of above

None of above

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* 2. What physical phenomenon allows thermal flow switches to detect flow rate?

Eddy current

Density transfer

Heat Transfer

Pressure Differential

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* 3. Thermal flow switches can be oriented in any position on process pipe/duct?

TRUE

FALSE

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* 4. Electronic outputs available from thermal flow switches include?

Relays

Open collector and transistor types

4-20mA

All of above

None of above

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* 5. All thermal flow switches are approved for use in potentially explosive atmospheres? (e.g. Div.1/Zone1, intrinsically safe)

TRUE

FALSE

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* 6. Among more than 10 manufacturers of thermal flow switches, how many provide failure rates and SIL value for IEC 61508 compliance?

0 (None)

All of them

5 of them

2 of them

8 of them

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* 7. Thermal flow switches provide exceptional reliability due to?

No moving parts in the fluid

Non-clogging, no dead-legs

No routine maintenance is typically required

All of above

None of above

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* 8. Thermal flow switches may be retracted from the pipe/duct without shutting down the process?

No, never

Yes, but only for gas applications

Yes, but only for liquid applications

Yes, for both gas and liquid applications

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* 9. Temperature compensation circuitry in thermal flow switches is important because?

It provides additional output of temperature

Prevents false trips if fluid and/or ambient temperatures change.

To ensure compatibility with different fluids

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* 10. Thermal flow switches cannot be used in applications where the fluid temperature exceeds 300°F (150°C)?

TRUE

FALSE

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* 11. Please provide your contact information to receive a $5.00 Starbucks gift card (emailed to first 200 U.S. residents only).

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