HFM-3060 pages

www.teledyne-hi.com
HFM--306 ((Fllow meter))
• Available flow ranges:
0-2500 slm to 0-8000 slm (N2)
FEATURES
• Rapid Settling Times
• Operating Pressure to 300 PSI
• NIST Traceable Calibration
APPLIICATIIONS
• Delivery Systems
• R&D and Process Flows
• Petrochemical
• Fuel Cell
TELEDYNE HASTINGS INSTRUMENTS
The 300 Series products contain a number of features that set
them apart from other, available instruments:
1. They are inherently linear; no linearization circuitry is
employed. Should recalibration in the field be desired (a
calibration standard is required), the customer needs to
simply set the zero and span points.
2. The output signal is usable for very large overflows and
will not come back on scale when a flow an order of magnitude
over the full scale flow rate is measured.
3. The instrument incorporates a replaceable sensor module.
4. The unit has very fast settling times.
For a full explanation, please see the 300 Series white paper on
www.teledyne-hi.com
When viewing the electronic version of this Product Bulletin,
use this link:
http://www.teledyne-hi.com/tech-papers/Flow-Reading.pdf
The heart of the instrument is a high speed thermal transfer
sensor and a linear laminar flow shunt assembly. The sensor
has been optimized to minimize the thermal transfer time in
order to speed up the flow response.
HFM-306, High Capacity Meter
DESCRIPTION
Teledyne Hastings Instruments (THI) products represent
over 60 years of experience in the design and manufacture
of flow instrumentation. The 300 Series is a culmination of
this experience with patented technologies that make these
the finest flow meters and controllers available today.
The THI Mass Flow 300 Series meters and controllers are
designed to accurately measure mass flow without
corrections or compensations for gas pressure and
temperature.
The HFM-306 version is accurate to better than ±3.0% of full
scale. THI mass flow instruments do not require any periodic
maintenance under normal operating conditions with
clean gas.
In the HFM-306, this pressure drop is measured in an annular
region around the laminar flow shunt after the entrance
effects and before the exit effect occur. This vastly
improves the linearity of the flow divider and minimizes the
large changes in linearity that typically occur when the
specific gravity of the flowing medium changes.
The HFM-306 includes a flow straightening section which
helps establish well defined flow for higher accuracy.
Instruments are normally calibrated with the appropriate
standard calibration gas (air), then a correction factor is
used.