Abstract: The present invention relates to the technological field of meter systems and refers to a device for measuring the level of a fluid, especially, fuel fluids in vehicle tanks. The device in question including an optical guide having interaction surfaces and an light emitter element emitting light beams, an optical system including at least one collimator lens and a light diffuser, and at least one receiving element of the light beams, in which the information captured by the receiving element from the reflection reflected by the inclined interaction surfaces indicates the level of fluid stored in the reservoir. The inclined surfaces can have different angles (a), (?), or an intermediate angle between (a) and (?).

Abstract: A surge protection circuit for an electronic device such as an HVAC controller. In one example, the surge protection circuit may include a first voltage clamp, a second voltage clamp, a resistor, and an output port. The first voltage clamp may provide a first clamping voltage between a power input terminal and a common terminal. The second voltage clamp may provide a second clamping voltage that is less than the first clamping voltage. The resistor may be connected in series with the second voltage clamp, and the series connected resistor and second voltage clamp may be connected in parallel with the first voltage clamp. As such, a surge current at the power input terminal may be split between the first voltage clamp and the second voltage clamp. The amount of surge current that is provided to the second voltage clamp may be set by the value of the resistor.

Abstract: A surge protection circuit for an electronic device such as an HVAC controller. In one example, the surge protection circuit may include a first voltage clamp, a second voltage clamp, a resistor, and an output port. The first voltage clamp may provide a first clamping voltage between a power input terminal and a common terminal. The second voltage clamp may provide a second clamping voltage that is less than the first clamping voltage. The resistor may be connected in series with the second voltage clamp, and the series connected resistor and second voltage clamp may be connected in parallel with the first voltage clamp. As such, a surge current at the power input terminal may be split between the first voltage clamp and the second voltage clamp. The amount of surge current that is provided to the second voltage clamp may be set by the value of the resistor.

Abstract: A surge protection circuit for an electronic device such as an HVAC controller. In one example, the surge protection circuit may include a first voltage clamp, a second voltage clamp, a resistor, and an output port. The first voltage clamp may provide a first clamping voltage between a power input terminal and a common terminal. The second voltage clamp may provide a second clamping voltage that is less than the first clamping voltage. The resistor may be connected in series with the second voltage clamp, and the series connected resistor and second voltage clamp may be connected in parallel with the first voltage clamp. As such, a surge current at the power input terminal may be split between the first voltage clamp and the second voltage clamp. The amount of surge current that is provided to the second voltage clamp may be set by the value of the resistor.

Abstract: The indicator terminal for a coulometric measuring device includes a terminal body with a conically shaped inner space that is coaxial with a tubular nozzle situated in the terminal body. The inner space intersects with a contact mouth formed as a cylindrical recess at a base end portion of the terminal body. A measuring edge of the contact mouth is defined at the base end of the terminal body. The tubular nozzle has a terminus at a predetermined distance before the base end of the terminal body near the contact mouth. Centering and supporting means for the tubular nozzle include three ribs that project across the inner space to engage the periphery of the tubular nozzle and extend along the nozzle in helical fashion so as to be nonparallel with the axis of the nozzle. A reinforcement in the terminal body helps prevent distortion of the contact mouth when the terminal is pressed against a metallic surface.