Table of Contents

• Veri-Flow 500 - the most versatile flowmeter
• ADM Series - the easiest to use
• Optiflow Series - dependable bubble flowmeters
• FlowTracker 1000 and 2000 series

Agilent offers flowmeters for measuring capillary column flows, calibrating air pumps and flow controllers, and verifying instrument gas flows.

Setting and maintaining GC flow rates greatly affect the instrument accuracy and sensitivity. Choosing a flowmeter for your application depends upon measurement speed, ease of use, accuracy and flow rate range.

Agilent offers a flowmeter recalibration and repair  program.  Learn more about this program.

Measurement Speed
Agilent  offers two types of volumetric flowmeters — bubble (Humonics Optiflow) and acoustic displacement (ADM series) — and one mass flowmeter (Humonics Veri-Flow 500).

Volumetric measurements rely upon the volume of gas passing through the flowmeter but not the composition. Additionally, volumetric flowmeters accurately measure from a mixed or multi-component gas stream. Mass flowmeters are calibrated to specific gas compositions and determine the flow rate for those calibrated gases. Mass measurements are independent of temperature and pressure.

With volumetric flowmeters, no adjustments are needed when switching from one gas stream to a different composition stream. So, an analyst can immediately change from measuring nitrogen from a GC detector to helium split rate from an injection port, to methane from an anaerobic digestion vessel. If a mass flowmeter is used, the analyst must change instrument settings and purge the flowmeter of the initial gas before accurate readings can be taken.

Ease of Use
When setting gas flows with many flowmeters, the analyst often needs more than two hands to hold and start the flowmeter. With continuous flow readings, the analyst does not have to start or stop the flowmeter with each measurement. The Veri-Flow 500 and ADM flowmeters read flow values continuously.

Flow Rate Range
Low flow rates? No problem (down to 0.1 mL/min). Very high flow rates? No problem (up to 25 L/min). A wide range of flow rates? No problem (0.10-1000 mL/min using a single flowmeter).

Accuracy
Agilent accurately calibrates all flowmeters to NIST-traceable standards.

Which flowmeter should I use? 
Refer to our Flowmeter Selection Guide for a complete guide.

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