English to Russian Tech/Engineering Engineering: Industrial

Электрокотактный манометр WIKA PGS10.
The instruments are delivered with a single or double contact (normally closed or normally open).
With 'normally closed', the contact flag is engaged with the limit switch and, on rising pressure, disengages from the contact via the actuator attached to the pointer.
The circuit will be interrupted.
With 'normally open' the contact flag follows the pointer until the limit value is reached.
Once the limit value has been exceeded, the contact flag engages and the circuit is closed.