Stack TPMS Lite Installation Manual

TPMS Lite Installation Guide ST542119-002

TPMS Lite

Installation Guide

Sensor Installation

Antenna Installation

Configuration Software

Display Gauge

CAN Message Formats

Troubleshooting

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1. TPMS Lite Sensor Installation
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Tools Required

The following tools will be required for the fitting process:

Torx (R) T20 Screwdriver /Torque driver (RS 662-608, DemonTweeks BIKTORXKEY)
4Nm Torque screwdriver ¼” Drive (e.g. Teng Tools 1492SD)
11mm x 50mm Socket (e.g. Teng Tools M140611-C)

Parts Description

TPMS Fitting Kit

A: Self Locking Torx Screw

B: Sensor

C: Valve

D: Spacer Ring

E: Collar Nut

F: Valve Cap

G: Installation Bar

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Valve Fitting

Ensure the wheel rim is cleaned and degreased around the valve and wheel well (Green area).

Insert valve into wheel rim. Fit the spacer ring (D) and then the collar nut (E) finger tight.

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Insert the installation bar (G) into the valve body and tighten the collar nut (E) to a torque of

4Nm +/-0.5Nm

Press the sensor down into the wheel well so that base of the sensor is touching the rim.

NOTE: The base of the sensor must make contact with the wheel rim.

NOTE: The sensor antenna must point away from the centre of the wheel.

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Tighten the Torx screw (A) to 4Nm +/- 0.5N

Once tightened check the sensor is still in contact with the rim.

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The sensor is now fitted correctly to the rim and ready for the tyre mounting.

NOTE: It is recommended to fit some identifying mark on the outside of the tyre to indicate
the rim is fitted with a TPMS sensor. This will alert tyre fitters to the fact there is a sensor
fitted and extra care should be taken when mounting/dismounting the tyres.

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Incorrect Fitting Examples

The following are examples of bad fitment that will degrade the performance of the system:

Sensor not in contact with rim.

X

Sensor antenna pointing away from wheel centre and sensor base not

touching rim.

X

X

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2. TPMS Lite Antenna Installation
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Introduction

This chapter will describe the fitting of the TPMS Dual-Band Antennas to a vehicle. Please ensure you
read this guide carefully to obtain the best performance out of the system.

Antenna Details

The Stack TPMS antenna is an advanced Dual-Band Antenna (DBA). For optimum system performance,
care should be taken to fit the antennas according to the guidelines in this document. The system
performance can be impaired with poor antenna placement.

The antenna picks up 2 signals. The first is the SAW (433 MHz). This is the signal used to measure
pressure and temperature. The second signal is the RFID or Sensor ID (868 MHz). This is used to pick up
the sensor serial number and the calibration details. Both signals are required for successful operation of
the TPMS system.

Antenna Placement

The goal of choosing an antenna position is to achieve the strongest signal strength for both SAW and
RFID over the widest wheel rotation. There will be some points of wheel rotation where a signal will not
be strong enough to take a measurement. These are generally called NULLS. It is common to have 3 nulls
per rotation of the wheel for the SAW signal.

The antenna must be placed as close as possible to the wheel.
The antenna front “box” must be directly in line with the tyre sidewall

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The antenna must be mounted radially from the centre of the tyre.
The Ground plane can point towards or away from the centre of the wheel.
The antenna can be mounted behind NON conductive panels (Kevlar, GRP)

In a typical installation you will achieve 90-120deg of RFID coverage and 270 degrees of SAW coverage. It
is important to optimise the RFID coverage to maximise the area at which the RFID can be read over.

Typically the RFID cannot be read outside the area shown above. This should not be a concern when
finding an antenna position as long as you have the coverage shown above.

It is important to get to as close to 120deg of rotational coverage as possible for optimum system
operation.

For ease of installation we recommend you use the Monitor mode in the TPMS configuration software.
This can be found on the Monitor tab of the configuration software. Selecting simple monitoring mode
will allow you to see the following information.

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The SAW_Strength and RFID_Strength indicators can be used to tune the antenna position.

Antenna Placement

The antenna installation is normally done in several parts. The first is to choose an initial location for the
antenna based on the above guidelines and measure the signal strength during a complete wheel
rotation. This will give a baseline to work from. Then the process is repeated with a new antenna
position. Each time the goal is to increase the wheel rotation coverage or signal strength.

Note: Please ensure that the antenna is secured onto the car with Velcro/dual lock when taking
measurements. Holding the antenna can lead to signal variations.

NOTE: It is strongly recommended that you spend the time at this stage to find the optimum antenna
position as it will significantly reduce the potential for problems later on.

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Antenna Placement Restrictions

If you have to mount the antenna to a conductive surface (metal, carbon) then you MUST

space it off the surface by 10mm. Dual lock is ideal for this.

Should you have to mount the antenna behind a conduction surface then please ensure that

you cut a window for the antenna that is the same as the dimensions below. This is essential
for the correct operation of the antenna.

Antenna Do’s and Don’ts

Do

Ensure the antenna is mounted following the guidelines in this manual
Take the time to ensure the antenna placement and tuning is as good as possible
Make sure the RFID signal can be read over at least 90deg of wheel rotation
Ensure the SAW signal is as strong as possible throughout the whole wheel rotation

Don’t

Mount the antenna behind a conductive panel (Carbon, Metal) without first making the

hole as above in the panel

Don’t hold the antenna when performing the installation. Use dual lock
Don’t cut or modify the ground plane of the antenna. This is crucial for correct

operation.