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141-072011 - 201/203 Series Page 4 of 23
1. General Information
The Hastings HFM-201/HFM-205/HFC-203/HFC-207 series Mass flow meters (HFM-201/HFM-
205) and controllers (HFC-203/HFC-207) are designed to accurately measure and control mass
flow over the range of 30 slm to 2500 slm, without corrections or compensations for gas pressure
and temperature with an accuracy of better than ±1% from the mean (±2% FS for 201/203 units in
the ½” fitting size base with flows >500 slm). Hastings mass flow instruments do not require any
periodic maintenance under normal operating conditions with clean gases. No damage will occur
from the use of moderate overpressures (~500 psi/3.45 MPa) or overflows. Instruments are normally
calibrated with the appropriate standard calibration gas (nitrogen) then a correction factor is used to
adjust the output for the intended gas. Special calibrations for other gases, such as oxygen, helium
and argon, are available upon special order.
1.1. Features
• LINEAR BY DESIGN. The Hastings 200 series flow instrument is 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. There will be no appreciable linearity change of the
instrument when the flowing gas is changed.
• MODULAR SENSOR. The Hastings 200 series flow instrument incorporates a removable/replaceable
sensor module. Field repairs to units can be achieved with a minimum of production line downtime.
• METER SETTLING TIME. Changes in flow rate for the HFM-201/HFM-205 are detected in less than 2
seconds when using the speed up circuitry.
• LOW TEMPERATURE DRIFT. The temperature coefficient of span for the Hastings 200 series flow
instrument is typically less than 0.05% of full scale/° C from 15° - 45° C. The temperature coefficient of
zero is typically less than 0.1% of reading/° C from 0° - 50° C.
• FIELD RANGEABLE. The HFM-201/HFC-203 series is available in ranges from 30 slm to 1100 slm.
The HFM-205/HFC-207 series is available in ranges from 1000 slm to 3000 slm. For HFC-203 & HFC-
207 controllers, an orifice change is required as well. Calibration is required after all changes.
• CURRENT LOOP. The 4 - 20 mA option gives the user the advantages of a current loop output to
minimize environmental noise pickup.