The IN and OUT ports for the HFT are shown in this diagram:

IN port

The IN port is an optically isolated 5 - 24V DC input which is monitored by the device.

The use of IN1 is optional. Its function is to allow the user to wake up the device when it is in power saving mode. The power saving mode is typically used for battery and solar installations where there is no external mains power.

You could wake the HyDip with

• an external switch such as a press button or a reed switch fitted to a door
• the optional external HyDip LCD display. This displays current dip levels simply by pushing the button on the external HyDip LCD display, which wakes up the device and relays information to it via the D-A and D-B ports on the HyDip device side panel.

Note that you can always wake up the device by pressing any key on the HyDip controller panel.

To connect a wake-up trigger, follow the schematic above, ensuring that IN1+ goes to the switch, and IN1- to the negative terminal of a 24V maximum power supply.

When the device is woken up via the IN1 input it will show the standard display, with readings for each of the four level sensors.

OUT port

HyDip OUT ports are relay outputs that are controlled from the HyDip device.

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Equipment connected to the HyDip IO ports may be activated remotely without warning

Plan ahead when connecting to IO ports:

OUT1 is a switched output which can be optionally connected to an external overfill alarm.

Once the fluid level exceeds the overfill level preset in the HyDip device, the output (OUT1) is short-circuited to ground. This can be used to activate an external alarm circuit to alert that the overfill level has been reached.