Switches Indicators & Gauges

A Shaft Encoder is a self-contained shaft encoder with SDI-12 data logger. Shaft encoders convert shaft rotation to pulses for accurate and precise measurements of river stage or other water applications. The H-510 is designed for simple field replacement of ADRs and other shaft encoder systems. It is a float-driven stage sensor that is designed to be used with data-acquisition instruments that have incremental encoder inputs.

Shaft encoders contains a small, weather resistant enclosure which helps protect it from the elements and makes for easy mounting of the device itself.

A shaft encoder is a mechanical float and pulley assembly that rotates with fluctuating water level. As a float rises or falls, a pulley rotates the shaft of the encoder, generating signals for both rotation direction and amount.

Some of the key features include:

• Direct replacement for USGS ADRs
• Footprint compatible with Fisher Porter & Stevens ADRs
• Generates quadrature output for driving other external logging devices
• Shaft encoder position maintained during power loss
• Data is stored on a nonvolatile FLASH Memory Card
• Built-in keyboard and display allows easy setup using menus and pick list
• Accepts analog and event inputs using optional “Side-Kick” Modules.
• Connectors on the H-510 provide “Quick Connect” for SDI-12 sensors
• Terminal block connector provides a generic interface for SDI-12 sensors
• ATA FLASH Memory Cards available (PCMCIA)
• Generates Industrial 4-20 mA output using H-416
• Auto-offset feature

Semrad-Enviromental Water Products Dividson

WaterLOG produce the WATERLOG^® Model H-510 which is a self-contained shaft encoder with SDI-12 data logger. Semrad Pty Ltd is the sole Australia distributor of WaterLOG environmental water measurement products, including the Model H-510. For more information click here to see the Semrad Website.

Linear Cable Extension Transducer (otherwise known as a string pot, a draw wire sensor, a string encoder or a yo yo pot) is a device that is used to detect and measure linear position and velocity using a flexible cable and a spring-loaded spool. It measures this distance by monitoring the amount of cable extended from the transducer. It is used to measure the position of slide gates, canal gates, and other linear mechanisms. The body of the transducer is enclosed to ensure that it is protected from moisture and dirt.

The Linear Cable Extension Transducer can be easily mounted to any fixed surface and the stainless steel cable can be attached to any movable object.

How it works

A cable is attached to the movable object. As the object moves, the transducer produces an electrical signal proportional to the cable’s linear extension. Cable extension transducers contain a cylindrical spool that turns as the cable reels and unreels. The spool is coupled to the shaft of a rotational sensor. As the transducer’s cable extends along with the movable object, it causes the spool and sensor shafts to rotate. The rotating shaft creates an electrical signal proportional to the cable’s linear extension.

Semrad-Enviromental Water Products Dividson

WaterLOG produce a SDI-12 digital linear cable extension position transducer which is one of the most popular on the market. Semrad Pty Ltd is the sole Australia distributor of WaterLOG environmental water measurement products, including the SDI-12 digital linear cable extension position transducer. For more information click here to see the Semrad Website.

Gas Bubblers

A gas bubbler is piece of laboratory glassware. It contains a glass bulb that is filled with a small measure of liquid (usually the liquid is either mineral or silicone oil, however, in some cases mercury is also used). The bulb opening is joined to a ground glass joint. They are used to exclude air from:

• a reaction-in this case the gas bubbler is fitted on the condenser of the reaction set up
• a system-in this case the oil bubbler is usually installed at the end of the inert gas manifold on a Schlenk line (a chemistry apparatus that consists of a dual manifold with several ports that are used for safely/successfully manipulate air sensitive components) to prevent contamination from atmospheric oxygen/water.

Gas Purge Pressure Measurement System Replacement

Gas Purge Pressure Measurement Systems replace the heavy, dangerous, high-pressure gas bottles, oil sight feeds, flow regulators, and leaky manifolds found in gas pressure measurement systems.

Advantages

Some advantages include:

• Reliable
• Light weight
• Low power operation-can be powered by 12 volt battery and solar panel (which makes it suitable for deployment in the most remote locations)

Gas Purge Pressure Measurement Systems are used in many different applications to measure fluid levels such as:

• Stream, lake and well level monitoring logging
• Safe/hazardous waste monitoring
• Cellular phone links for remote monitoring, full bidirectional setup, and data acquisition

Suppliers

WaterLog produce Model H-355 ‘Smart-Gas’ Gas Purge Pressure Measurement System. The main supplier of Water Log products is Semrad (a leading distributor of level switches and transmitters, designed especially for harsh industrial applications, including caustic and chemical solutions). For more information click here for the Semrad Website.