Electronic sandwich timers from ValvesOnline have three standard timer functions; cycle timer, single shot timer and delay single shot timer. These solid state electronic devices plug into any pneumatic, hydraulic or fluid valve with a square 28 mm plug.
These timers are multi-voltage with a manual override or test button. Their design also incorporates yellow LED 'on' and LED 'off' indicators and IP65 weather protection. They have a rotatable connection which is mounted in 180 degree positions on the coil terminal which means that they can accommodate earth up or earth down connections.
These devices are compact and have an external time adjustment function. Adaptor plugs to convert from ISO square 28 mm to DIN 43650B 28 x 22 mm are also available.