INTERNAL vs. EXTERNAL TIRE PRESSURE MONITORING SYSTEMS
There are two types of Direct Tire Pressure Monitoring Systems – 1) internal sensor systems where the sensor is inside the tire or 2) external systems which use external sensors (like PressurePro). Internal systems use sensors that are strapped around the wheel or replace the valve stem and are inside the tire. Internal sensor systems require additional antennas in the wheel wells for reliable reception of sensor signals, are expensive to install and maintain and are challenged with getting a reliable signal through the metal and materials of a tire. External systems are those which have sensors which read from outside of the tire with PressurePro the leader in this market, easier to install, maintain and use. Following, is a comparison of Internal (vs.) External Systems.
INTERNAL SENSOR SYSTEMS:
More expensive for equipment and to install, require added time for installation.
Normally require extra antennas in each wheel well which can be broken or damaged.
Have difficulty getting a clean signal out of the tire which is essentially a metal cage.
Sensors are easily damaged when removing a tire from the rim.
Do not give a pressure reading until vehicle is moving at least 20mph.
Give a low pressure alert only when the tire is 20% to 25% low on pressure.
Sensors make it difficult to rotate tires. The sensors have to be removed to reprogram, or you must purchase expensive electronic tools to reset the sensor to the monitor.
Expensive to maintain, taking time and money to break down the tires to get to them.
Can’t be used with tubed tires that use the bladder in the tire to hold air.
Can be easily damaged when removing the tire, by excess heat common inside of tires (can be caused by several things, a stuck brake, a wheel bearing, hard braking).
Sensors are expensive, normally costing in the range of $65 to $110 dollars U.S.
Internal systems are not as reliable or as accurate as PressurePro.
In truck fleets worldwide, fleets have consistently turned away from internal sensors because of the time and expense it takes to break down all tires to install, to maintain and to replace when necessary. Inside the tire sensors are not able to acquire pressure readings until the vehicle is moving which means the vehicle will leave its ‘yard’ before they know there is a problem. The driver now has to stop, turn around, and go back for repairs. Fleets are inconvenienced and suffer loses due to the much higher alert levels of internal sensor systems. Internal sensors alert to low pressure only after pressures have a 20% to 25% loss. The tire and casing are already damaged, you have more wear on the tire and you’ve reduced fuel and time efficiency.
2) EXTERNAL SENSOR SYSTEMS:
Less expensive, quick and easy to install, simple to use.
Do not require antennas in each wheel well.
Sensors are durable using specially designed GE materials.
Sensors are not inside a metal container, reliable strong, clear signal for greater reliability.
PressurePro alerts to low pressure and displays current pressures while parked or on the move.
PressurePro is the only system with a first alert alerting at just 12.5% pressure loss.
PressurePro has two alert levels – 12.5% and 25% low – giving drivers a warning and allowing them determine how severe the problem is and how quickly they must take action to be safe.
External sensor systems are simple to install, take little time to replace and low cost to maintain.
PressurePro is one of the most experienced and oldest TPMS products in the market, the original external sensor system.
PressurePro sensors can be re-programmed to new positions or switched to new vehicles easily, quickly and without hassles or any breakdown of tires.
PressurePro is durable, accurate and reliable.
PressurePro offers more features than any system on the market and is one of the very few to offer compatibility to GPS/Asset Tracking type products. PressurePro offers a higher degree of tire protection by alerting at lower pressure loss situations and displaying current pressures and alerts - while parked or on the move.
PressurePro is the market leader because it works; it’s reliable, durable and accurate. PressurePro is easy to install and simple to use. PressurePro, compared against all other TPMS systems products, offers the most cost competitive pricing and the most reliable and State-of-the-Art technology in the TPMS market and has been judged by the U. S. Department of Transportation and the Consulting firm of Booz Allan to be one of the most effective TPMS products. PressurePro is a leader in reliability, durability and accuracy with an easy to install and simple to use system. Frost & Sullivan, well respected in the U.S. and worldwide, found PressurePro to be the best Tire Pressure Monitoring System, adding savings and safety for fleets with all types of vehicles.
[h=1]TPMS Benefits - Quantification of Need[/h] [h=3]Tire Industry & Government Information[/h]
A tire just 10% low on pressure loses 10% to 13% of its tread prematurely.
Under-inflated tires build up heat which destroys tires and breaks down casings.
Low tire pressure is the single greatest cause of tire damage and failure.
Tires are responsible for 53.5% of all tractor/trailer breakdowns.
Rode side breakdown costs average $255 for the service trip alone.
Tires low on pressure, are more susceptible to blowouts and zipper rips.
Properly inflated tires save fuel, up to 5 cents a gallon on average.
10% under inflation increases fuel consumption on a per tire basis lowering fuel efficiency by 1% to 2% and releases 1.5 million tons of carbon dioxide (CO2) unnecessarily.
A difference of 10 lbs. in air pressure between a set of duals, literally drags the lower pressured tire 13 feet per mile.
In a recent NHTSA survey, about 30% of cars and trucks have at least one tire under-inflated by 8psi or more.
[h=3]ROI - Savings Calculated On Information From Tire Industry & Government Statistics: [/h]
Trucks driving an average of 150,000 miles per year, averaging 7.5mpg, fuel costs averaging 3.75/gallon – a savings of just ˝% amounts to over $375 per year in fuel usage.
Tires low on pressure break down the casing which can’t be retreaded. New tire costs range between $250 to $650 per tire for a new tire (vs) retreads at $100.
Road call costs are averaging $300 to $900 per call. (This does not include cost of downtime, tire repair or driver time.)
Cost of manually checking tire pressures on one (1) truck with 10 wheels, average of 15 min (DOT) twice per month for 1 year will average about $75 to $100 in labor cost.
Tires running just 10% low on pressure prematurely wear tire tread 10% to 13% faster than tires properly inflated.
Safety “costs”; injury claims, insurance premiums, workers' compensation claims, as well as "goodwill" with customers and suppliers are difficult to estimate but are a very real cost affecting profits.
OE systems can't identify which tire is problematic; you have to test all 4 or 5 (incl. spare) tires to find which is low on pressure.
OE system can't display an actual PSI drop or real-time pressure readings of a problematic tire(s).
OE system warns when tires lose 25% to 30% or more of their recommended inflation pressure. Most aftermarket models have different alert levels with up to 1 to 3 psi accuracy.
Some OE systems cannot be reprogrammed to work with aftermarket low-profile tires at all.
Some OE systems utilize valve stem sensors as opposed to screw-on valve caps or strap-on sensors for the aftermarket. (For valve stem replacement sensors, valve stems are difficult in terms of compatibility, most wheels (esp. aftermarket ones) are NOT compatible with valve stem sensors. Compatible wheels need to be specially engineered so that they can accommodate such sensors.
Some OE systems relies on the vehicle's anti-lock braking system (ABS) to detect under-inflation, (Indirect Systems) while aftermarket sensors broadcast data via a wireless transmitter (RF) to a display panel with a central receiver.
Indirect OE systems work by comparing the rotational speed of each wheel in normal driving mode & relies on a tire that is substantially under-inflated having a roller diameter that is smaller than its counterparts.
Aftermarket systems display panel analyzes the data & displays which tire is under-inflated & the actual pressure of that (and each) tire.
OE valve stem sensors are costly and difficult to replace.
Many OE sensors require the use of a counterbalance to balance the weight of the sensor. Aftermarket sensors normally are very light and do not need a balance.
Some aftermarket TPMS systems operate while the vehicle is stationary or on the move.
Aftermarket TPMS systems do not give false alerts if the vehicle is driven on gravel or bumpy roads, has mismatched tires, or a tire that is out of balance/alignment.
OE systems are engineered to meet the NHTSA law without incurring any extra expenses, in other words, for a little more, they could have used much better technology like aftermarket systems use and offer much greater peace of mind but they chose money over functions, how sad.
1976 Newell Classic (Sold)
Home Base: Riverside, CA
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