3059Y-1-500LF Bourns Inc., 3059Y-1-500LF Datasheet - Page 10

• Manufacturer Part Number: 3059Y-1-500LF
• Description: TRIMPOT 50 OHM 1.25"REC CER MT
• Manufacturer: Bourns Inc.
• Series: 3059 - Sealedr

Specifications of 3059Y-1-500LF

• Temperature Coefficient: ±100ppm/°C
• Resistance (ohms): 50
• Termination Style: PC Pin
• Power (watts): 1W
• Tolerance: ±10%
• Number Of Turns: 22
• Adjustment Type: Side Adjustment
• Resistive Material: Cermet
• Mounting Type: Chassis Mount
• Package / Case: Rectangular - 1.250" L x 0.190" W x 0.315" H (31.75mm x 4.83mm x 8.00mm)
• Track Resistance: 50ohm
• No. Of Turns: 22
• Resistance Tolerance: ± 10%
• Power Rating: 1W
• Potentiometer Mounting: Through Hole
• Resistance: 50 Ohms
• Operating Temperature Range: - 55 C to + 150 C
• Element Type: Cermet
• Dimensions: 6.10 mm W x 31.75 mm L
• Product: Trimmers
• Taper: Linear
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Fuel Level Sender
The fuel level in automotive applications is typically measured by a float and lever
arm assembly that operates a variable resistor mechanism. In many cases, this
assembly (known as a fuel sender or fuel level sender) is mounted in the fuel tank
and integrated into the fuel delivery module. This module removes fuel from the
tank and delivers pressurized fuel to the power train.
Figure 2: Fuel level sender mounted in fuel tank
Fuel Level Sender Design & Construction
The variable resistor mechanism is comprised of a wiper and a resistor element
printed on a ceramic substrate. The resistor element (also known as a fuel card) is
mounted close to the pivot point of the float arm, which is attached to the wiper.
As the float rises and falls with the fuel level, the wiper moves in a rotary motion
across the tracks on the resistor element, translating the float position into a
resistance value. This is converted into a voltage or current signal driving the
indication system in the dashboard. Less common are linear type fuel level
senders where a float moves within a tube, translating the fuel level into a linear
wiper movement. This type of fuel level sender is mainly used in space-
constrained tanks, as in motorcycles and scooters.
Most car models have custom designed fuel tanks, where the tank is molded to fit
around other components and body frames. There is an increasing trend to use a
more complex blow-molded plastic tank versus the traditional steel tank. On rear
wheel drive and four wheel drive vehicles, a saddle tank is often used, where the
two halves of the fuel tank straddle the rear drive shaft. These complex fuel tank
geometries require specific fuel card resistor profiles so that the translation of the
8
Fuel lines
Fuel
Fuel sender flange
Fuel card
Float arm
Fuel Cards
Many of the world’s leading manufacturers have long known Bourns as a company
they can trust to deliver quality electronic components on-time and within target
costs. At Bourns, we understand that automotive manufacturers need complete
solutions, from simple substrates to complete substrate and cable assemblies.
To achieve an optimum blend of price and quality, we are structured to be one of
the world’s most vertically integrated suppliers. Bourns® Trimpot® Division offers
numerous solutions for fuel level sensing requirements.
Float
Fuel tank
Figure 1: Fuel delivery module
Figure 3: Bourns fuel level sender
Figure 4: Overview of automotive fuel
storage & delivery system
Fuel sender
flange
Filler neck
Fuel tank
Fuel
lines