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3.2 Selection of sensors

The selection of the sensors is exclusively determined by the need for permanently mounted cables to be installed.

 

  • sensors with a permanently mounted cable

IRMA-S-T

  • Sensors with a removable cable

IRMA-S-T with connector

Supplement May 2003

In vehicles with a reflective metallised floor (see photo), sensors of the type 5KT02 or 5TT02 rather than sensors of the type 5KT01 or 5TT01 are to be used exclusively.

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The number of sensors for each door depends of the door width only.  In the following drawing, the door width is shown schematically.

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A distinction is made between narrow doors, wide doors and extra wide doors. This table provides an overview of the possible door widths:

Description of door width

Explanation

narrow doors

door width < 1m(door width < 3'3'')

one sensor per door

Doors that cannot be passed conveniently by two adult persons besides each other at the same time

wide doors

1.0m <= door width < 1.5m

(3'3'' <= door width < 4'11'')

two sensors per door

Doors that can be passed conveniently by two adult persons besides each other are considered to be wide.

extra wide doors

1.5m <= door width < 2.0m

(4'11" <= door width < 6'6'')

three sensors per door

Doors that can be passed conveniently by three adult persons besides each other are considered to be extra wide.

Identical sensors are used for narrow, wide and extra wide doors.

 

When selecting the location to install the sensors, check that no mechanical parts, such as the pieces of doors or their supports, are moving in the area vertical below the passive component of the sensor.
In the figure on the right, the area in question is hatched.
 Scale: NTS

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When selecting the location to install the sensors, also check that the sensors will be installed as close as possible to the vehicle wall.  The space required for the installation of the sensors is shown in the figure on the right (an optimum is 45mm in height and 50mm in depth).
Note that during adjustment the sensor housing must be inclined and may not have any contact to the chassis.

Scale: NTS

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The sensors are designed symmetrically with regard to their longitudinal axis.Scale: NTS

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This allows to install the sensors in two different ways (rotated by 180°):

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The sensor arrangement is described by the term element combination (EC).  The element combination includes the information for the software in the analyser as to