The Ruelco pneumatic tattletale is a unique device to provide indication when production control or safety system sensors and control devices trip. The tattletale is designed to be installed in the exhaust port of pneumatic control devices and sensors. When these sensors or control devices trip, the pneumatic pressure venting through the exhaust port willl cause the cap of the tattletale to pop out. This exposes a red indicator band giving visual indication that the device has tripped. First-Out indication of several sensors can be obtained by using the tattletale in conjunction with a pneumatic relay. Often this eliminates the need for an expensive control panel.

Likewise, the Ruelco hydraulic tattletale is designed to be installed in the return line near the exhaust port of a hydraulic sensor or control component. When the sensor or control device operates and vents or exhausts hydraulic fluid, the pressure in the return line will cause the cap of the tattletale to pop out. This exposes a red indicator band giving visual indication the the sensor or control device has operated. The Ruelco hydraulic tattletale is ideal for indication when a hydraulic pressure sensor has operated and gives first – out indication when the sensor is used to vent a hydraulically actuated valve.