Accu-Pressure Warranty

Accu-Pressure warrants this product to be free of manufacturing defects for a period of 1 year from date of purchase. If found to be defective, please return the product with dated proof of purchase for immediate replacement. This warranty is limited to the replacement of the product only and does not extend to any incremental cost incurred should the product fail. In no case shall liability exceed the purchase price. This warranty gives you specific rights, which may vary from state to state. Accu-Pressure is designed to warn you of tire pressure loss. It does NOT replace normal tire maintenance and pressure monitoring recommended by the manufacturer.

Accu-Pressure Caps Test Reports

Recently the manufacturer of Accu-Pressure Safety Caps commissioned an independent testing laboratory to evaluate the physical capabilities and performance of their tire pressure monitors (TPMs) under a variety of conditions. Below are the results of these reports for both the Standard (low pressure) and Heavy Duty (high pressure) versions.

Heavy Duty Caps Safety Test Report

Following is a summary of the most recent TPM (tire pressure monitor) characterizations tests performed on the heavy duty Accu-Pressure safety caps for trucks.

A. BACKGROUND. TPM's will likely be produced in multiple form factors and with differing capabilities. Most TPM's will be electronic devices, which communicate via a wireless link in addition to presenting a visual indicator to the operator or technician. One TPM under consideration is the mechanical TPM made by Accu-Pressure. This TPM displays green if the tire pressure is in the acceptable range, and red if the tire pressure is 10% or more below the target. Accu-Pressure TPM's are available in a variety of target pressure settings.

B. PURPOSE. The test is designed to measure the leakage rate of the TPM itself. No amount of leakage is acceptable. The test will also measure the repeatability of the devices by testing at least 100 units. It will also verify the thresholds at which the display changes.

C. PROCEDURES: Leakage Rate. Create a pressure vessel capable of holding 200-psi steady state pressure. Arrange the pressure vessel so that an Schrader/tire inflation fitting (provided by the engineer) can be mounted. Inlet air must be gated. Measure the internal pressure of the vessel with a suitable electronic device accurate to +/- 1 psi capable of unattended data logging.

Affix an Accu-Pressure TPM to the Schrader fitting of the pressure vessel. Pressure the vessel to the pressure indicated on the cap of the TPM. Close the supply line valve to isolate the pressure vessel. Log the internal pressure of the vessel for 72 hours.

Repeat the process for each of the 100 TPM's supplied by the engineer.

Accuracy. With the pressure vessel of Test I, affix an Accu-pressure TPM to the pressure vessel. Pressurize the vessel to the TPM's rated pressure. Bleed air from the vessel at a rate of 5- psi per minute. Record the pressure at which the display goes from green to red. Compare the recorded pressures to the manufacturer's specification as a percent error. Repeat the process for each of the supplied TPMs.

Repeatability. Use the data from Test II and calculate min, max, average, and standard deviation for the transition pressures recorded.

Thermal Cycling. With the pressure vessel of Test I, affix an Accu-Pressure TPM to the pressure vessel. Pressure the system to 100 psi. Place into the Russels climate chamber and cycle from -40°F to 165°F as quickly as the chamber can cycle. Repeat the cycle five times. Repeat the process for ten Accu-Pressure TPM's.

Pull Apart - Thread Failure. The objective of this test is to determine the ultimate strength of the plastic threads in the Accu-Pressure TPM. Mount a valve stem of valve stem facsimile into the Instron material tester. Place an Accu-Pressure TPM onto the test device. Pull the Accu-Pressure unit off the threads, measuring the force required to strip the Accu-Pressure TPM. Test five units.

Pull Apart - Weld Failure. This test is designed to study the weld integrity of the "Glass Body" to "Valve Body" joint. Fixture the Accu-Pressure in the Instron material tester so that tension is applied to the indicated weld joint. Measure the force required to rupture the unit. Test five units.

Save all test articles for failure analysis.

Standard Safety Caps Test Report

Following is a summary of the most recent performance tests performed on standard-pressure Accu-Pressure safety caps.

I. The regular quality test of the Accu-Pressure valve caps, as brief as follows:

Purpose: Observe for air leakage or inaction.

Destruction Test: After Accu-Pressure caps are locked and fixed on the test momentary inflation from 0 PSI to 70 PSI shall be performed. The action of this shall be executed.

Functional Test: After Accu-Pressure caps are locked and fixed on the test rod, momentary inflation from 0 to the specified pressure of the product (26 PSI - 40 PSI) shall be executed.

Air-Tightness Test: Apply foam or soapy water on the entire gauge cap.

Appearance Check: We reject products that are damaged and assembled in disorder.

Sampling Test: The sampling rate for the above four items shall achieve 99.75% accuracy rate.

** The sampling ratio - 25:1
** Standard - Maximum 0.4% failure rate allowed.

II. TEST / Evaluation report of Accu-Pressure valve caps:

Functionality and accuracy:

Design and Physical Characteristics: The tire safety gauge is found to protrude pass the sidewall of the tire on some designs.

Salt Fog Corrosion Test (ASTM B117-85): The specimen was subjected to a 72-hour salt spray exposure in accordance with ASTM B117-97. The specimen was evaluated every 24 hours.

High Temperature Test: The product in reference consists of highly insulated elements for the petrochemical heat generated in the tire during high-speed driving (40° C - 65° C) at the safety rate of 99.81%.

Low Temperature Test: When used under 45° C, the product delivers the same performance as under normal temperature and environment at the safety rate of: 45° C: 97.28% and 30° C: 99.81%

Road Test: Bumps =- No effect. Others such as dirt - No effect. Water - 4 tiny drops of water on viewing dome after 2 hours under water.