The D56Hybrid consists of the following principal components:
- Strong aluminum die-cast housing with cable gland
- Analog pressure gauge with colored scale (55 mm diameter)
- Additional zero pressure dial (only D56i0)
- Electronic PCB with up to four microswitches and terminal block, switching function configurable as NO or NC
- Aluminum pressure connector
- Reference gas bellow, filled with SF6 gas
The cover with cable gland and the connecting cable with connectors form a single unit that is easy to dismantle with a screwdriver. The device can be supplied with a concentric pressure connection or various angled connections.
The Densistat D56 / D56i0 monitors gas density by way of a reference chamber filled with SF6 gas. The gas and reference chambers are separated by a metal bellows. A pressure difference corresponds to a density difference between the two chambers and deflects the metal bellows. The movement of the bellows is transmitted by a switch rod. A switching plate activates the microswitches whose purpose is to indicate a pressure drop.
The operating points for triggering the signal can be set at the factory according to the customer’s requirements by way of lockable screws (plungers). Up to four microswitches with changeover contacts can be installed in the housing. The microswitches are installed on a circuit board together with a multipole terminal block within the housing.The connecting cable is connected to the terminal block and exits the device through a cable gland.
The analog pressure gauge shows the relative pressure of the SF6 gas, referenced to 20 °C in the gas chamber. A change in gas density attributable to a leak is indicated by deflection of the needle. The colors and transitions on the dial can be specified by the customer and calibrated to the relevant values.
The arrangement of the measuring mechanism and the use of vibration-resistant microswitches rule out any shock-induced chattering at the switching contacts. In order to prevent condensation, the unit is equipped with a Gore-Tex® equalizing membrane.
The information on this website represents the state of knowledge at the time of writing. Technical specifications are subject to modifications. Comde-Derenda GmbH accepts no liability whatsoever for the content provided or for damages resulting from the use of its products.