Profile: Dag Process Instruments Pvt. Ltd. manufactures process control switches. We design and develop pressure, level, flow, vacuum, temperature, differential, pneumatic & limit switches, pressure and level transmitters & cable glands. We serve industries such as pharmaceuticals, offshore projects, compressors, petrochemicals, power stations, refineries and pumps. Our pressure switches are diaphragm operated, fixed differential type. Diaphragm movement is transferred to an SPDT switch, which gives (NO-NC-COM) change-over contacts. A counteracting spring is used to achieve the required settable range. Set point adjustment can be done internally using a spanner. Turning in the adjuster (from right to left) increases the pressure setting & vice-versa. Calibration has to be done against a pressure gauge.