Robertshaw Pneumatic Control System Components

The 82059 is a receiver indicator relay that is used to indicate safe or unsafe conditions of a meavariable. It exhausts actuating pressure from a control system when this variable exceeds its set point.
82059, 82440 , 82653

The 83939 logic relays are two-position, three-ported, and three-way. They can be manually or manually/pneumatically actuated.

The CR100 series ratio relays comprise a group of proportioning units designed for use in industrial pneumatic control systems where the application requires amplifying the volume of control air in a predetermined ratio.
CR100 Datasheet

The 85026 temperature sensor contains a two-position valve operated by temperature variations around an integral sensing bulb. It is designed to vent or block a pneumatic signal when a set point is reached.
85026 Datasheet

The explosion-proof I-542 series pressure switch is designed for rigorous engine-mounted applications. It provides low-cost and dependable protection against damage to equipment or processes.

I-542 Datasheet

The 84370 and 84390 pressure sensors contain weatherproof, snap-acting valves operated bypressure variation around an integral sensing element. These sensors are used to block or vent pneumatic signals.
84370 and 84390 Datasheet

The 85380 valve is designed for use either as a fuel gas valve or a starting air valve. Pneumatically actuated, the vent port will close before the main port will open as pressure is applied to the actuator diaphragm.
85380 Datasheet

The I-530 engine safety control is a dependable safety shutdown device which may be used t monitor lube oil pressure, jacket water temperature and over-speed
I-530 Datasheet