Catalogue JAQUET DSD
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Differential Ferrostat Sensor
DSD
DSD ferrostat sensors are suitable for generating speed dependent signals when used with a pole wheel (steel gear wheel, preferably with involute gear form).
They exhibit dynamic or static behaviour with guaranteed pulse generation down to between 5 and 0 Hz.
The sensor element is a magnetically biased differential Hall sensor followed by a short circuit proof amplifier. The sensor characteristic is not rotationally symmetrical.
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Connection
The sensor connections are sensitive to interference. The following 2 points should therefore be noted:
1) A screened 3 core cable must be used for connections. The screen must be taken all the way to the terminal provided on the instrument and not earthed.
2) The sensor cables should be laid as far from large electrical machines as possible and must never be laid parallel to high current cables.
The maximum permissible cable length is a function of sensor supply voltage, cable routing along with cable capacitance and inductance and max. signal frequency.
In general it is advantageous to keep the distance between sensor and instrumentation to a minimum. The sensor cable may be lengthened via suitable IP 20 terminals and Jaquet S3 cable p/n 824L-31081.
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Installation
These sensors incorporate a differential Hall element. The housing must therefore be orientated to the pole wheel as shown in the dimensional diagram (note the slot, arrow or hole). Incorrect positioning of the sensor affects its correct operation and noise immunity. The sensor is mounted with its centre over the centre of the pole wheel. With gear rollers or slots and radial mounting, the sensor is normally fixed over the middle of the wheel. Dependent on the gear width, a degree of axial movement Is permissible. The centre of the sensor must however remain a minimum of 3 mm from the edge of the wheel under all operating conditions.
It is important to ensure a rigid, vibration free mounting of the sensor. Sensor vibration in relation to the pole wheel may induce additional pulses.
The sensors are insensitive to oil, grease etc. and can be used in arduous conditions. If the cable is to come into contact with aggressive materials, then teflon cable should be specified. The sensor should be installed with the smallest possible air gap. This air gap must however not allow the face of the sensor to come into contact with the pole wheel. The air gap does not affect the calibration of the complete system.
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