MASS AIR FLOW SENSORSTECH BULLETIN

Fiberglass and Epoxy Printed Circuit Boards 1

Wire Bonding

Clear Silicone Rubber Potting

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4 Platinum Sensor Wire

Wire Bonding

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MASS AIR FLOW SENSORS

Use similar masking and circuit trace printing technologies as ceramic alternatives and produce voltage paths that are equivalent

Dorman uses FR4 rated fiberglass and epoxy laminated printed circuit boards (PCB) which are flame retardant rated and have near zero water absorption

Fiberglass Boards vs. Ceramic

Ceramic BoardsDorman Fiberglass BoardsCan be more fragile and can be at a higher risk for breaking and cracking under vibration

Uses only the wire and circuit pad material to make a mechanical pressure weld, providing superior consistency and low heat degradation at the wire connection

Wire Bonding vs. Hand or Machine Soldering

Hand or Machine SolderingDorman Wire BondingRequires a heat source and additional material to bond the wire, which can lead to heat degradation and bond consistency problems

TECH BULLETIN

Dorman Adds Value through Superior Materials and High Quality Engineering

FEATURES AND BENEFITS

All of Dorman’s MAF Sensors are made from platinum and

use platinum wires in the thermal resistors which is the

ideal material for resisting the high temperature generated

by the sensor

Platinum SensorsDorman uses silicone potting gel in the PCB, wire bonds and components. The silicone acts as a barrier against moisture and helps reduce vibration that can loosen components.

Potting Materials3

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OVER 60 SKUsprovide coverage for OVER 40 million vehicles

MASS AIR FLOW SENSORSTECH BULLETIN

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Dorman Products, Inc. 3400 East Walnut Street | Colmar, PA 18915 Corporate Office & Customer Service: 1.800.523.2492

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To ensure the highest quality standards, Dorman tests each shipment against a rigorous set of quality control procedures. All of Dorman’s Mass Air Flow Sensors are backed by Dorman’s Limited Lifetime Warranty

Dorman Adds Value through Superior Materials and High Quality Engineering

Dorman Quality Control

1. A variable speed blower provides air flow to the sensor through a long tube that stabilizes the flow for consistent data recording

2. Electronic equipment runs the blower at 10 speeds, including zero flow

3. The data is taken from the sample and matched against original equipment performance standards

4. Dorman is currently developing automated bench testing

Bench Testing

On-Vehicle Testing

Current Dorman bench testingAutomatic bench tester (in development)

1. Sensors are installed on test vehicles with no codes or modifications to the air filter box or intake manifold (no codes are verified with tech tool/scanner)

2. The test is repeated several times on a running vehicle using a tech tool to record data

3. Must pass under specific requirements: — Drivability must be the same or better than OE — No codes triggered — Vehicle computer correctly reads and interprets signal from sensor

Dorman MAF Sensor installed on a vehicle

Lifecycle Testing1. MAF Sensors undergo a three axis test for 144 hours to simulate

100,000 miles of road use

2. Air is flowed over the sensors during the test to monitor signal outputs at max supply voltage

3. The test is conducted in a temperature chamber cycling from -20⁰c to +125°c to check for failures in different temperature ranges

4. Bench tested to check flow calibration before and after each shake cycleDorman MAF Sensor lifecycle testing

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