Description

General
METRON transducers are used to obtain electronic speed and distance information on vehicles fitted with mechanica speedometers. The signal is in the form of a square wave and transducers can be supplied to give one, two, four, six or eigh pulses for each revolution of the speedometer cable. These quality transducers are of a robust metal construction and feature fully encapsulated electronics for environmenta protection.

Fitting locations
METRON transducers can be fitted in three different ways depending upon the characteristics of the vehicle concerned.

• Insertion in the speedometer cable
• Fitting behind the speedometer instrument
• Fitting to the vehicles gearbox

Type Identification
METRON transducers are identified by a series of numbers and letters stamped into the metal body of the unit. For example:

Additionally, transducers fitted with 24 volt electronics are identified by a red marker sleeve on the electrical cable next to the transducer body.

Transducer Options
The standard configuration that Metron transducers are supplied in, is detailed in this manual for each type. However, they can also be customised for your needs in the following ways.

• Wire sealing facilities. Which consists of a screw with a sealing hole to secure the moulded top and a sealing hole in the nuts where appropriate.
• Electrical cable to any length. We would not recommend more than 15 metres.
• 12 or 24volt electronics.

If you have other customisation requirements, please ask for a quotation.

Ordering Information
We require the following information when you order Metron transducers.

• Type number
• Number of pulses per revolution
• Any variation from the standard configuration shown

For Example:
Type 383 transducer with 8 pulses per revolution in standard configuration. Order code: 383/8
Type 383 transducer with 4 pulses per revolution with sealing facilities. Order code: 383/4-SEALABLE
Type 346 transducer with 8 pulses per revolution and a cable length of 5 metres. Order code: 346/8-5M

Note that as the standard configuration for this transducer is 24volt and with sealing facilities, these do not need to be shown.
Other parts should be ordered using the Order code shown in this manual.

Electrical Characteristics
Metron transducers use a high quality, high reliability Hal Effect device to produce a square wave output. It is very important that the parameters in the following sections are no exceeded.
They are protected against normal vehicle transients and load dumps but great care must be taken to ensure that the supply voltage to them is not connected in reverse. We recommend that a 500mA fuse is connected in the +ve supply line to these transducers.

12volt Transducers
Supply Voltage (Vcc): ……4.5v to 18vDC maximum
Current Consumption: ………………….Typically 6mA
Output Signal:……………………. Square wave at Vcc
Sink Current:…………………………… 10mA maximum
Temperature Range: ………………….-10°C to 150°C

24volt Transducers
Supply Voltage (Vcc): …… 15v to 36vDC maximum
Current Consumption:…………………. Typically 6mA
Output Signal: ………………… Square wave @ 12vDC
Sink Current:…………………………… 10mA maximum
Temperature Range:…………………. -10°C to 150°C

Connections
Red wire: …………………………………………………. Vcc
Green wire: ………………………………………… Ground
Blue wire: …………………………………… Output signal