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Model 826 & Model 827 Top-Trak® High Flow Mass Flow Meters

Our Top-Trak® Model 826 and Model 827 high flow MFM’s directly measure the mass flow rate of gases in flow ranges from 0-75 slpm up to 0-175 slpm.  The Model 826 and Model 827 are for measurement of air and ALL inert gases & mixtures.  These models serve a wide variety of gas flow applications compatible with the anodized aluminum flow body. Both models offer standard 0-5 VDC or 4-20mA output signals and accept NPT pipe thread connections.

Our Model 826 is equipped with a large tiltable LCD readout available in your choice of engineering units.  The LCD readout can be mounted on the instrument or on a remote panel. Our Model 827 is an OEM configuration that comes without the LCD readout. Sierra’s Platinum Sensor Technology to eliminate zero-drift and create excellent long-term reliability is utilized in the design of both models.



Unique Product Features
• Accuracy of 1.5% full scale
• Direct monitoring of mass flow rate
• Measures up to 175 slpm
• Large tiltable LCD
• Use with ALL inert gases & mixtures
• “Primary Standard” calibration for best accuracy & NIST traceability
• CE approved


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