QVT-SV: High Performance Differential Pressure Transmitter
The QVT-SV High Performance Differential Pressure Transmitter from Eastern Instruments is a differential pressure transmitter that has been optimized for the extremely accurate flow measurement of air and gas at low DP (below 8 in WC). When coupled with any Differential Pressure based flow element, such as averaging pitots, the QVT-SV will output either the differential pressure or the flow via a 4-20 mA signal.
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TECHNICAL INFORMATION
Below, you can find the manuals for the QVT family of flow transmitters. For any questions or technical issues that you may have, please contact us for assistance.
Differential Pressure Transmitter that will output Differential Pressure or Flow (which is uncompensated for Absolute Pressure or Temperature) via a 4-20 mA signal.
Our unique method of isolating sensors from the process requires no diaphragm seal, meaning that the QVT-SV can measure a much lower DP than traditional transmitters with diaphragm seals. Sensor Isolation can be further enhanced by using a Purge Seal (Low Volume Continuous Purge coupled directly to transmitter).
Accuracy of measurement can be as high as +/-0.50% of reading over a 100:1 range in DP and a 10:1 range in flow.
Can be ranged from 0 to 0.1 in WC up to 0 to 8 in WC.
Updates flow calculation 10 times a second.
All measured and calculated variables are available on LCD panel.
The 4-20 mA output can be configured to represent the Differential Pressure across the flow element or the flow rate of air passing through the duct.
Most variables, including the Ae Number, the full scale value, the units, and many more, are all set directly from the LCD/push button interface.
Differential Pressure value can be zeroed from the LCD/push button interface.
The QVT is Loop Powered and requires between 8.8 and 42.5 vDC.
The QVT is equipped with a single access head. Opening the head opens the display for troubleshooting as well as for wiring and installation.
The QVT Differential Pressure Transmitter can be used in a wide range of applications in a variety of sectors for accurate Differential Pressure based measurement. Whether coupled with an array of Eastern Instruments Insertion pitots or with another manufacturer's flow element, the QVT Differential Pressure Transmitter will accurately output either the DP or flow of air traveling through your duct work. Below are just a few applications.
PERFECT FOR NEW INSTALLATIONS
The QVT-SV is perfect for new installations and can easily be coupled with nearly any manufacturer's DP based flow element, including Eastern Instruments' own High Beta flow element, pictured here. Typically coupled with standard 3-Way or 5-Way Valves, the setup and installation of the QVT-SV is extremely simple.
The QVT-SV Differential Pressure Transmitter is perfect for retrofit installations as well, especially since the QVT-SV will work with any new or existing DP based flow element, making the QVT-SV perfect for retrofit applications where a transmitter is needed for an existing element. The optional mounting bracket for the QVT-SV Differential Pressure Transmitter allows it to be pipe mounted in either the horizontal or vertical plane.
Below, you will find a variety of product literature including product catalogs, single page cut sheets and various application guides that can assist in selecting the correct flow element for your project. If you have any questions, please feel free to contact us as well.
AIR FLOW PRODUCT CATALOGS
CUT SHEETS
MISCELLANEOUS DOCUMENTATION
What is the QVT-SV?
The QVT-SV Differential Pressure Transmitter will measure the Differential Pressure (Velocity Pressure) within nearly any low pressure ductwork and will deliver either a Differential Pressure or uncompensated 4-20 mA mass flow signal. The QVT-SV can be used with Eastern Instruments brand flow elements or with any other manufacturer's brand of DP based flow elements. While the QVT-SV Differential Pressure Transmitter is perfect for any application under 9 in WC, it is especially accurate for draft range applications where the Differential Pressure can be under 1 in WC. The QVT will work with any differential pressure based flow element. Some models are listed below.
WORKS WITH MOST DP BASED FLOW ELEMENTS
VAP INSERTION PITOTS
The VAP Insertion Pitot is designed for easy installation, via ports, directly into new or existing duct work. Insertion of a VAP Pitot will ensure an accurate differential pressure output that allows for precise airflow measurement and control of your process. The VAP Insertion Pitot is designed to perform particularly well in both clean air applications and in heavily particulate-laden applications and can be adapted for use in applications where pitot freezing is a concern. If you are looking for an economical and highly accurate method of measuring air flow in ducts with adequate straight duct runs upstream and downstream, the VAP Insertion Pitot is a great choice.
DSV - DUCT SECTION VAP
The DSV, or Duct Section VAP, incorporates straightening vanes and a VAP Pitot array within a spooled duct section to make installation of the VAP Pitot even easier. The DSV can be quickly bolted in place for new ductwork or can be retrofitted into existing duct work for simple and accurate air flow measurement. Designed for both clean air and particulate-laden air flow measurement applications, the DSV is an accurate, no-hassle air flow measurement device for ducts with adequate straight duct runs upstream and/or downstream.
HBP - HIGH BETA FLOW CONDITIONER
As not all ductwork allows for proper upstream and downstream straight duct runs, a flow conditioning device is often needed for profiling air flow at the point of flow measurement. The High Beta Process (HBP) Flow Conditioner is a proprietary-designed flow conditioning device, designed to eliminate cyclonic, turbulent and reverse flow, while minimizing pressure loss in almost any installation, including those with relatively few or almost no straight duct runs either upstream or downstream. The High Beta integrates flow-straightening vanes and a flow-profiling section with the precise measurement accuracy of the VAP Pitot to offer flow conditioning and accurate air flow measurement, even when placed directly downstream of an elbow, damper or other duct obstruction. The HBP comes in standard sizes that allow the delivery of accurate air flow measurement without the longer lead times associated with custom designs.
