The IND indicator and the POPO switch are compatible with both the UFS-AN and the UFS-T.

IND Indicator:
The PPE IND indicator is a lighted, momentary switch. When "air" is sensed, the IND will flash.

The momentary switch on the IND is used for the UFS-ANs and UFS-Ts "Press-to-Test" feature as well as the "Acknowledge" feature.

See the sensors page for more details regarding the "Press-to-Test" and "Acknowledge" features.

The standard IND legend reads "LOW FUEL" but other customized legends are available at additional cost.

POPO Switch:
The PPE POPO (Push-On Push-Off) is a lighted, push-button flip-flop switch designed to be able to carry the current of a small diaphragm-type transfer pump.

The sensor and the pump are wired to the POPO switch. To start a transfer, the operator presses the POPO switch. This starts the transfer pump and powers the sensor. When the sensor detects "air", it flashes the LED in the POPO switch, telling the operator to press the POPO again to stop the transfer.

The POPO switch and sensor can be wired to provide a steady light when the pump is on and a flashing light when "air" is detected. Alternatively, it can be wired so that the LED remains dark during transfer and flashes only when "air" is detected. While using the POPO switch, the sensor still maintains the "Press-to-Test" and "Acknowledge" features, but you will need to provide a separate, multi-poled momentary switch to power the sensor without the pump and to complete the PTT circuit.

The standard single POPO legend reads "AUX PUMP". If you buy a pair together, the legends will read "LEFT AUX PUMP" and "RIGHT AUX PUMP" but other customized legends are available at additional cost.

Complete wiring instructions for installation with a PPE UFS are available on the downloads page.