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201/203/205/207 Series Flowmeters and Controllers Instruction Manual
Features
STABILITY. The Hastings HFM-201/203/205/207 instruments operate on a unique thermal electric principle
using a heated metallic capillary tube and thermocouple temperature measurement. This results in an output
that is stable with time.
THERMAL MASS FLOW MEASUREMENT. The 200 Series sensor output is a function of the mass flow rate and the
heat capacity of the gas. Changes in gas composition usually only require a simple multiplier to account for the
difference in heat capacity. This gas conversion factor allows Hastings flowmeters to measure a wide variety
of gases.
LINEAR BY DESIGN. The HFM-201/203/205/207 Series 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.
MODULAR SENSOR WITH LOCKING CONNECTOR. The HFM-201/203/205/207 Series incorporates a
removable/replaceable sensor module with a reliable sensor to board connection. Field repairs to units can be
achieved with a minimum of production line downtime with confidence in the sensor to PCB connection.
SETTLING TIME. Filtering in the meter circuitry and more modern valve circuitry have improved the standard
200 Series response time in meters and controllers. Dual-stage valve controllers perform 10-100% flow changes
in about 6 seconds. 200 Series flow meters perform 0-100% in under 6 seconds.
LOW TEMPERATURE DRIFT. 200 series flow instruments have a thermal coefficient of span that is no more
than 0.06% of full scale/°C from -20 to 70°C and a thermal coefficient of about 0.035% of reading/°C from -20
to 70°C.
CURRENT LOOP. The 4-20 mA option gives the user the advantages of a current loop output to minimize
environmental noise pickup.
FLEXIBLE POWER REQUIREMENTS. 200 series instruments using the 24V board can operate with power
supplies capable of providing 11 – 36 VDC via the 9-pin D connector provided the supply meets the current
requirements (see sections 1.2 and 1.3).
EAR99 Technology Subject to Restrictions Contained on the Cover Page
Page 6 of 28
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