This externally-rated IP68 contactless exit button is a momentary switch with volt-free relay outputs, so can be used for all sorts of applications and not just as a door switch. It's designed to be completely contactless, making it the ideal solution for settings where hygiene is important or hands may be frequently dirty in the external setting; but equally offers a huge advantage to workplaces where staff may often have their hands full and may struggle to use traditional exit buttons safely or efficiently. A further advantage with these is that they can be powered by 12 or 24v DC, giving a wide scope for the amount of systems this would easily be integrated into without complications.
Common practice in many work environments such as warehouses etc often falls to the fitting of green-dome type exit buttons at waist-height, allowing staff to nudge the button with their hip, but equally this can prove to be hazardous especially if carrying awkward or heavy loads, so a contactless button that can just have an elbow waved past it (or just about anything moved within close range of the reader) allows safe and easy operation to trigger the lock or door operator, or indeed whatever else you may be looking to control with these touch-free switches.
The slick contemporary design is unobtrusive and can be fitted to a standard UK pattress. They come in two finishes, white or black, both of which have a stunning acrylic fascia (note there is a protective film over the acrylic fascia which should be removed), which incorporates the proximity sensor and also the illuminated hand icon shown in the images. This illuminates blue when powered, and changes to green when the sensor is activated and the relay is triggered. This visual feedback can be very important if triggering something you cannot physically see or hear the action of, so is a very well placed feature we were delighted to see when doing our testing.
On the back of the unit you'll see there's a flylead (which is about 190mm / 7.5" long), offering five coloured cores - red, black, yellow, white, and green. The wiring detail of these is shown in the product images and in the datasheet, but for reference, red is your positive 12/24v DC, black then is your ground, with the following three cores being your relay output triggered by activation of the switch; yellow being the common, with white being the normally-closed contact and green being the normally-open contact.
You will also note two variable resistors giving adjustment for relay time and the sensitivity of the reader. These are stamped with "VR1" and "VR2", with VR1 being the relay time setting and the VR2 being the sensitivity of the proximity sensor.
By turning VR1 clockwise, it will increase the timer on the relay, and turning anti-clockwise will then reduce the time. The timer range is 0-30seconds.
VR2 will then adjust the sensitivity of the reader; turning clockwise will increase the read-range, allowing for the unit to be activated from further away, while turning anti-clockwise will reduce the rang, reducing false-actions but also requiring a closer presence to the reader to activate the relay. The read-range is 5-20cm (50-200mm), however whilst testing these units we found these were able to read up to 25cm (250mm) when set to its maximum, so quite a variable range depending on the setting and your requirements.
What may be equally as important to some, is that it does not even need to be a hand or indeed any other part of your body placed in front of the sensor, it can equally be a box or anything else that is being carried. For example when measuring the distances on our bench test, even a thin plastic ruler was able to trigger the reader at the maximum read distance, clearly demonstrating that even in the most awkward of circumstances, passing just about anything through the sensor's read range will allow you to trigger the relay to control your door or whatever else you may be looking to trigger.