WSX53
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WSX53 Document: WSX53APN.DOC Issue: 1.02 Date: August 2008 Page 1 of 4 Precipitation Detector The WSX53 is a very robust electronic precipitation detector which is designed for controlling many systems where there is need to respond to external weather conditions. Such systems include .. Building Automation .. Plant Automation .. Commercial and Residential Homes .. Weather Centres .. Sprinkler Control .. Agricultural use, etc. .. De-icing and drying systems It may be required to activate things such as .. Blowers .. Heaters .. Boilers .. Door or window closers .. Shutters, or other items in response to the external weather conditions. With its wide operating temperature range and IP66 enclosure it is suitable for use in many inhospitable situations. The detector consists of two essential parts. There is a humidity sensor which senses any precipitation without discrimination i.e. rain, snow, hailstone, sleet are all detected the same. The humidity sensor is complemented by an ambient temperature sensor which is used to sense snow point and thus discriminate between rain on the one hand and snow, sleet or hailstone on the other. Precipitation at or ControllerPrecipitationSensorTemperatureSensorBlackBrownWhiteYellowRedVioletBlueGreen8-CoreCableS1S2WSX53Temperature(Snow point)ContactPrecipitationContactPower Supply24V DC/ACNot used Figure 1 WSX53 - Functional diagram below snow point is interpreted as “Snow”. The WSX53 is fully self contained and requires only the application of 24V DC or AC power supply to be operational. Its outputs are a pair of volt-free contacts which are totally independent of each other. One set of contacts (S1) is closed if the precipitation sensor detects any precipitation, i.e. when there is water or moisture on it. Otherwise it remains open. To make sure that the sensor still works in case of dry precipitation (hailstone and dry ice), it has a built in heater which maintains the sensor’s temperature always above freezing point. This means the sensor is always kept clear and no frozen water or ice is allowed to accumulate on it over a long period of time. The other set of contacts (S2) is closed when the controller senses an ambient temperature below snow point. Otherwise, the contacts remain open. Sensor The WSX53 has a proprietary design sensor combining

WSX53 Document: WSX53APN.DOC Issue: 1.02 Date: August 2008 Page 2 of 4 an ingenuous design with a special drive algorithm to ensurelong sensor life. Output Configuration Each set of contacts will independently sense either precipitation (S1) or Snow Point Temperature (S2). To sense only frozen water (snow or hailstone), connect S1 and S2 in series. To sense either or SPT, connect S1 and S2 in parallel. Time Delay The two contacts, S1 and S2, have a post operative delay time. The delay timer can be activated by setting two switches inside the control housing to be either 0 (no delay), 15...

WSX53 Document: WSX53APN.DOC Issue: 1.02 Date: August 2008 Page 3 of 4 .. Aerosol freezer (available from most electronic component distributors. .. Cotton swabs 1. Connect the yellow and white wires to the 24V power source and switch on. 2. Check that there is an open circuit between a. Black and brown wires b. Red and violet wires 3. Moisten the cotton swap and apply a drop or two of water on the precipitation sensor. You will hear a “click” as the precipitation relay energises. Confirm this by checking for continuity between the red and violet wires. 4. Now spray the temperature sensor...

WSX53 Document: WSX53APN.DOC Issue: 1.02 Date: August 2008 Page 4 of 4 Figure 2 WSX53 Figure 3 Surface-mounting holes details - remove lid to reveal holes.