901 is a factory set pressure switch. It is approved by ATEX and this means that the pressure switch is pre-configured at the factory before being sent to the markets. The pressure switch is configured for optimum accuracy and tolerance levels. The optimum level is of accuracy and tolerance for 901 pressure switch can also be set as per the customer requirements. The tolerance level is set for hysteresis.
The diphrams of this pressure switch set are made up of an elastomer material. These again can be selected for the application. There are other options also available for diaphragm materials that include materials like NBR, FKM and EPDM diaphragm material. The selection of diaphragm materials indicates the level of corrosion and aggression. For example, diaphragm of Chemraz material is used for a high level of aggression and corrosion.
The pressure switch can be put to various uses. It can be used used on air pressure or for oil pressure. It can also be used for any kind of non viscous liquid. The pressure switch can be activated with a NO or NC. It can be used to switch the supply voltage and it can also be taken off a PLC, a control panel or even an alarm. This [pressure switch can also be used in hazardous environments.