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Varec Biogas

Varec (VApor RECovery Specialty Company) began business in the 1930's at its manufacturing plant in Compton, California. Varec was there in the infancy stage of the biogas market in the early 1950's. From the onset, Varec's focus was to deliver Biogas Handling products that suited customers' specific requirements, even if it meant creating the product off the drawing board. Varec initially sold direct to end-users and in the 1970's instituted a Sales Representative Network that catered to Municipal Wastewater Treatment Plants. A select number of Sales Representatives in the United States helped Varec acquire approximately 90% installed base from the 2,500 Wastewater Treatment Plants that utilize Anaerobic Digesters for Biosolids Treatment built between the mid-60's to late 70's. Today, Varec Biogas is 100% dedicated in providing total solutions to the biogas market. In February, 2003, Westech Industrial Inc. acquired the biogas portion of the Varec business from Tyco Valves and Controls, LP Inc.

Cover Position Indicator

Varec Biogas 2592 Cover Position Indicator

The Varec 2592 Series Cover Position Indicator is designed for use with vertically- guided or spirally-guided floating digester and gas storage/holder covers. The unit incorporates the use of a Varec 2500 Series gaugehead to continuously monitor the position of floating covers. Plant operators can easily monitor cover position, which provides an indication to the current status of the digester or gas storage/holder. This includes the addition of raw solids withdrawal of liquor or digested solids, and changes in gas storage volume. The 2592 Series provides a local read-out of cover position. The gaugehead conveniently mounts to the digester wall, at eye-level. Transmitters are available to provide a remote signal in several different protocols including 4-20 mA, Modbus and Hart as examples. Limit switches can be added to control alarms or other equipment. Cover position indicators for spirally-guided gas storage/holder covers require a Varec 8200 Series Current Output Transmitter, and a local display for proper cover position indication. The 8200 Series must be purchased separately. Refer to the product data sheet for more information. A tape/cable assembly connected directly to the digester cover actuates the Varec 2592 Series gaugehead. The gaugehead uses a Negator (spring) motor. It is designed to provide constant tension on the tape/cable. The motor automatically compensates for variations in the weight of the tape at different cover levels. As the cover moves, the perforated tape rotates a sprocket sheave in the gaugehead. This drives the counter mechanism to show cover position. The negator motor is an improvement over the counter weights commonly-used with the gaugeboard indicators because it provides simplified overall maintenance and improved accuracy in read-outs. The counter assembly is isolated from the main gaugehead housing. Dial and counter wheels are black with large white numerals for easy reading. The standard gaugehead reads in feet, inches, and 1/16″ increments. The standard 2592 Series is suitable for 20 feet (6m) maximum cover travel. A metric gaugehead, with readability to 1 mm, is available as an option. Please consult the factory for higher ranges. For alarm capability or remote level indication, auxiliary equipment is also available.



  • Continuous Monitoring
  • Guagehead Mounts at Eye-Level and is Easily Readable
  • Optional Transmitter Provides for Remote Read-Out
  • Switches Available for High and Low Alarm