Switch or Relay Weather Instruments
Last Updated: April 1, 2025
Description
Switch or relay weather instruments are devices that facilitate the transfer of electrical power or functionality between circuits. They are designed to make or break an electrical circuit, which is essential for controlling various weather-related measurement and monitoring systems.
Working Principle
Switches and relays operate by electrically transferring power from one circuit to another. This is achieved through the making or breaking of an electrical circuit. Switches are typically actuated manually, whereas relays are often actuated electrically. The utility of these devices lies in their ability to control electrical circuits without the need for direct human intervention, making them highly useful in automated weather monitoring systems.
Applications
Switch or relay weather instruments are used in a variety of specific applications. For example, mercury tilt switches, which contain a small amount of mercury inside a glass bulb, are used to sense inclination and can be found in thermostats that control heating and cooling systems based on temperature changes . Additionally, reed switches, which are actuated by a magnetic field, are used in environments where hermetic sealing is necessary to protect against moisture and other environmental factors .
Advantages over other Materials - Lubricants, Fluids and Waxes
Switches and relays, particularly those with sealed contacts like reed switches, offer advantages over traditional materials such as lubricants, fluids, and waxes. They provide reliable operation in harsh environments where chemically active liquids, dust, and dirt are present, which can cause traditional materials to degrade or fail .
Limitations
One limitation of mechanical switches is their susceptibility to harsh environments, which can cause contacts to stick or remain open. This can lead to reliability issues, especially in environments with chemically active substances . Additionally, electromechanical switches have a limited contact life cycle and can be large and slow to respond .
Considerations
When selecting switch or relay weather instruments, several factors should be considered. Initial costs and operating expenses can vary significantly depending on the type of switch or relay chosen. Electromechanical switches, while versatile, may have higher maintenance costs due to their mechanical components. Solid-state switches, although more expensive initially, offer faster switching speeds and reduced maintenance due to the absence of moving parts . Durability and accuracy are also critical considerations, especially in extreme temperature environments where poorly designed switches may exhibit reduced accuracy .
from Vaisala
For visibility measurement and precipitation type detection. Present weather detector and visibility sensor, you will find the mix you require of visibility measurement range, characterization of reduced visibility, precipitation type identification and many more. Features •... [See More]
- Output Options: Outputs an analog current signal (i.e., 4-20 mA); Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Maximum Measuring Height: 39.33
from RainWise, Inc.
Anodized Aluminum Rain Gauge. The RainWise model RGA industrial tipping bucket rain gauge is constructed from anodized aluminum and stainless steel to provide years of precision recording of rainfall data. The tipping bucket is molded from a specially-formulated plastic that has a very low surface... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Accuracy: 0.5000
from Campbell Scientific, Inc.
The TB4 rain gage is manufactured by Hydrological Services Pty. Ltd. Rain funnels into a tipping bucket mechanism that tips when 0.01 inches (0.25 mm) of rain has been collected. Each tip is marked by a dual reed switch closure that is recorded by a Campbell Scientific datalogger pulse count... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Measurement Increment: 0.0100
from Vaisala
Measure prevailing visibility and detect precipitation type. Vaisala's PWD-series of present weather detectors and visibility sensors provide you off-the-shelf accuracy and reliability. Features • Accurate, traceable measurement of prevailing visibility • Detects... [See More]
- Output Options: Outputs an analog current signal (i.e., 4-20 mA); Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Maximum Measuring Height: 39.33
from RainWise, Inc.
Heated Precipitation Sensor. The RainWise model PG/H industrial tipping bucket precipitation gauge is constructed from anodized aluminum and stainless steel to provide years of precision recording of any type of precipitation. Product Features. The tipping bucket is molded from a... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Measurement Increment: 0.0100
from Campbell Scientific, Inc.
The CS700 rain gage is manufactured by Hydrological Services. Rain funnels into a tipping bucket mechanism that tips when 0.01 inches (0.25 mm) of rain has been collected. Each tip is marked by a dual reed switch closure that is recorded by a Campbell Scientific datalogger pulse count channel. After... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Measurement Increment: 0.0100
from Vaisala
Accurate wind speed and direction measurement in a compact and economical package. The Vaisala Wind Sensor WM30 is a compact and economical wind speed and direction sensor. The rotating cup anemometer at the top of the unit provides a linear response to wind speed. The vane, which is attached to the... [See More]
- Output Options: Outputs an analog voltage signal; Frequency or Modulated Frequency Output; Switch or Relay Contact
- Weather Component Sensed: Senses Wind Speed; Senses Wind Direction
- Device Classification: Sensor Only
- Velocity Range Measured: 1.12 to 134
from RainWise, Inc.
The standard mounting is the RainWise plug-in mount that matches our Monopod. The sensor can also be furnished with a small NEMA 4X enclosure equipped with a Monopod mount for remote installations. Product Features. The RainWise Leaf Wetness Sensor consists of a gold plated printed circuit board... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Measures %Water or %Moisture Content
- Device Classification: Sensor Only
- Humidity or Moisture Instrument Type: Solid State
from Campbell Scientific, Inc.
Met One's Model 385 provides year-round measurement of rain or snow. It features a 12-inch diameter orifice that funnels precipitation into the tipping bucket assembly. When the tipping bucket fills, it tips and activates a reed switch. The switch closure is recorded by the datalogger, which is... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Measurement Increment: 0.0100
from RainWise, Inc.
Polypropylene Rain Gauge. The RainWise model RGP industrial tipping bucket rain gauge is constructed to provide accurate recording of rainfall data at a reasonable price. The 8 ” diameter collector meets NWS specifications for statistical accuracy. Product Features. The tipping bucket causes a... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Measurement Increment: 0.0100
from Campbell Scientific, Inc.
The 014A Wind Speed Sensor is a general purpose anemometer suitable for use in a variety of applications. The 014A is an accurate and durable 0-100 mph anemometer with a threshold of 1.0 mph. The sensor is a continuous duty measurement tool designed for long-term unattended operation in adverse... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Senses Wind Speed
- Device Classification: Sensor Only
- Velocity Range Measured: 0.0 to 100
from RainWise, Inc.
The RainWise Precipitation Sensor consists of a gold plated printed circuit board pattern that senses the presence of moisture. Any moisture on the surface of this board results in a contact closure. When connected to a RainWise data logger, a timer is energized and the “on ” time is... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Rain / Snow Collector Type: Other Rain
from Campbell Scientific, Inc.
The TE525 tipping bucket rain gage is manufactured by Texas Electronics. The TE525 measures in 0.01 inch increments. Precipitation is funneled into a bucket mechanism that tips when filled to a calibrated level. A magnet attached to the tipping mechanism actuates a switch as the bucket tips. The... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Measurement Increment: 0.0100
from RainWise, Inc.
Wind Speed & Direction Sensor. The RainWise multivane wind speed and wind direction sensor consists of a multi-vane rotor and wind direction vane mounted on a anodized aluminum support tube. RainWise modeled the multi-vane rotor after a similar design that was used to measure the wind speed of... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Senses Wind Speed
- Device Classification: Sensor Only
- Velocity Range Measured: 0.0 to 150
from Campbell Scientific, Inc.
The TE525-series tipping bucket rain gages are manufactured by Texas Electronics. The TE525WS measures in 0.01 inch increments. The gage funnels precipitation into a bucket mechanism that tips when filled to a calibrated level. A magnet attached to the tipping mechanism actuates a switch as the... [See More]
- Output Options: Switch or Relay Contact
- Weather Component Sensed: Measures Rain/Snow Fall
- Device Classification: Sensor Only
- Measurement Increment: 0.0100