Shock Sensor Precautions During Use

Installation orientation

The orientation of the sensor installation can be randomly set, without any limitation. For proper characteristics, however, install so that the orientation of the impact to be detected and that of the sensor are aligned.

Installation face

Be sure to install the sensor on a flat surface. An uneven installation surface could cause distortion of the case, which may apply stress to the internal detection mechanism, failing to obtain proper characteristics.
When a frequency which is the same as the structural natural resonant frequency, determined by the structure, material, weight, and rigidity of the installation surface is added from an external source, resonance will occur (vibration is amplified to cause strong oscillation). When this happens, decide carefully if this could cause erroneous detection.

About installation

Tightening torque and nominal diameter of the screws at installation.

For a permanent installation, mounting using plain washers and screws is recommended.There are two locations for screw tightening.
For a temporary installation or when the installation surface is not suitable for screw connection, adhesives can be used for fixing. When the adhesives are elastic and when the part between the case and the mounting surface is thick, the vibration attenuates, affecting the sensitivity. To avoid this, be sure to apply adhesives as widely and thinly as possible over the part between the sensor case and the mounting surface. Select the adhesives considering the materials (with excellent adhesion to the mounting surface, case material, and the surface processing) and the use environment (temperature, humidity, and vibration frequency and amplitude), and select adhesives with peeling resistance and shock resistance (e.g. CEMEDINE Super X, Locktite 480). Where the use environment can gradually degrade the adhesives, be sure to fully evaluate the environment before use. When using double-sided tapes for fixing, the adhesive strength may weaken due to aging deterioration over time, and the sensor may be peeled off. Fully evaluate the mounting condition before use. Select tape with durable adhesive strength that will not deteriorate. The thickness of the tape as well as the deterioration of the supports or adhesives can also change the level of shock the sensor detects. When changing the thickness, supports or adhesives, be sure to confirm their condition before use.
To the magnetic metal surface such as steel, the sensor can be fixed using a magnet if mounting is for a temporary purpose, or when the installation surface is not suitable for screws. If a magnetic tape is applied to the sensor for mounting, the magnetism of the magnetic tape can influence the internal circuit of the sensor, affecting the proper characteristics. Be sure to fully evaluate the mounting condition before use.
After installation, be sure to check that there is no rattling, otherwise, it could affect the proper operation of the sensor.

Connector harness

Ensure that when shock and vibration are applied to the harness that this does not cause inadvertent disconnection or malfunction.
In order to guard against this, secure the parts of the harness that are pulled out or extended.
Because the GIS, GID and GAC series use connectors with strong locking action, please work with these connectors unlocked when unplugging the connector harness. If you pull it out forcibly, damage and disconnection may result.

Low frequency sound (air vibration)

In environments where low-frequency sounds (air vibration) are present such as when low frequency audio speakers are in the vicinity, if vibration occurs in the mountings of the sensor due to this, carefully determine whether this noise will cause false triggering of the sensor. It may be possible to eliminate this problem by changing the mounting position of the sensor and the structure of the mountings themselves.

Direct physical impact

Since structures such as a shock or vibration source may directly strike the case of the sensor or the harness of the sensor, this may cause breakage of the case etc. and breakage of the harness. Please account for this possibility in your mounting design.

Regarding thermal shock

Check for the possibility that if thermal shock is applied to the sensor from a source of hot air such as from a dryer or rapid cooling such as a cooling spray, the detection sensitivity will change during the sudden temperature transition. Be sure to check the influence before use.

Change of air pressure

When using in a location where a sudden change of air pressure is likely, confirm that operation in that situation is satisfactory.

Wet environments and similar

Avoid using and storing in locations where contamination by water, oil, chemicals, corrosive gases, etc., is possible or in places exposed to direct sunlight. Also, condensation and freezing will have a significant effect on product life and characteristics.

External pull-up resistor

When using a pull-up resistor outside the 2nd terminal (OUT) of the normally closed product of GIS, GID series, the resistance value should be 100kΩ or less. *Please use within the range of "output capacity" stated in specifications and brochures.

Change of structure

When changing the structure, constituent materials and installation method when the characteristics of the sensor are being evaluated, even if the same impact is applied, the impact reaching the sensor through the structure (magnitude, vibration direction, vibration frequency, amplitude) will change, so please be sure to evaluate only when the structure has been finalized including constituent materials and installation method.

Prior evaluation

Please use only after sufficient preliminary evaluation such as operation, performance, reliability etc. in the state of being actually mounted on your product.

Uses requiring high reliability

Be sure to contact us first if the product is being considered for use in an application which requires extremely high reliability, where its breakage, malfunction, or operation can be reasonably expected to be, directly or indirectly, a significant threat to human life, or can cause injury, or damage to property, including, but not limited to medical equipment, automobiles, aerospace vehicle instruments, nuclear power control equipment or other equipment or instruments. In normal use, be sure to provide safety measures to avoid secondary disasters to ensure the safe operation of the entire system.