Electronic condensate drains LD

Electronic LD

The LD series watches the level with a capacitive sensor and opens the valve only once there is something to let out — then shuts it before the air can follow the condensate. That is why you lose not one litre of compressed air. Nine sizes cover everything from a small workshop dryer to a large compressor room.

Which LD you need

It is chosen by where the drain will go — which is why the table has three separate flow columns. Behind the compressor the condensate is heaviest, on the dryer less, in a filter least; on the same unit those figures differ by up to ten times. Choose by your own place, not by the biggest number.

The stated capacities apply at a pressure of 7 bar, a temperature of 20 °C and 60 % relative humidity.

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How the LD works

Inside the body is a collecting chamber with a capacitive sensor. As condensate flows in, the level rises; at the upper mark the electronics open the valve and empty the chamber. The moment the sensor reports empty, the valve shuts — and because that happens before the air reaches the valve, nothing escapes.

The panel carries two LED indicators and a test button. The button opens the valve by hand so you can confirm it is not blocked. Inside there is a filter screen that catches dirt before it reaches the valve — and that is also the part replaced at a service.

Fitting

It connects from above by a thread, and the condensate outlet takes a 12 mm push-in fitting. Units with an L in the code have an extra side connection — useful wherever you cannot reach the tank from above. It can be mounted upright or horizontally.

What to watch

The stated capacities apply at 7 bar, 20 °C and 60% humidity. In warmer and damper conditions there will be more condensate, so it pays to take a unit with some margin. And allow for an annual service — the screen and the seals are changed then.

Ventilek says

A zero-loss drain pays for itself; you just do not see it happening.

A timed drain costs a few thousand and an electronic one several times that — except the timed one lets air out every single time, even when there is nothing to drain. Air you paid to make. The LD opens only when it has something to remove. The more hours the compressor runs, the sooner the difference evens out. And choose by where it is fitted: on the compressor a different figure applies than in a filter.

Frequently asked questions — electronic ld

How do the units with an L differ?

They have an extra side connection G 3/4"/G 1/2". Otherwise they are identical — the same capacity and the same flow rates. You take them where the tank cannot be reached from above.

Which figure in the table is mine?

The one for where it is fitted. A drain on the receiver behind the compressor takes the „compressor" column, on the dryer the „dryer" column and in a filter the „filter" column. The figures differ by up to ten times, so it matters.

What is changed at the annual service?

The screen and the seals. They are in the service kit for that series.

Does the LD need power all the time?

Yes, it runs on 230 V and is rated IP 65. With no socket by the compressor, reach for a float drain — that one needs no electricity.

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