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141-072011 - 201/203 Series Page 8 of 23
2. Installation and Operation
This section contains the necessary steps to get a new flow meter/controller into operation as quickly
and easily as possible. Please read the following thoroughly before attempting to install the
instrument.
2.1. Receiving Inspection
Carefully unpack the Hastings 201/203 series instrument and any accessories that have also been
ordered. Inspect for any obvious signs of damage to the shipment. Immediately advise the carrier
who delivered the shipment if any damage is suspected. Check each component shipped with the
packing list. Insure that all parts are present (i.e., flow meter, power supply, cables, etc.). Optional
equipment or accessories will be listed separately on the packing list. There may also be one or more
OPT-options on the packing list. These normally refer to special ranges or special gas calibrations.
They may also refer to special helium leak tests, or high pressure tests. In most cases, these are not
separate parts, but special options or modifications built into the flow meter.
2.2. Power Requirements
The Hastings 200 series flow instruments (bipolar 15 Volt versions) require ±15 VDC @ ±30 mA/1
Watt (HFM-201/205) +60 mA, -185 mA / 3 Watts (HFC-203/207) for proper operation. The
supply voltage should be sufficiently regulated to no more than 50 mV ripple. The supply voltage
can vary from 14.0 to 16.0 VDC. Surge suppressors are recommended to prevent power spikes
reaching the instrument. The Hastings power supplies described in Section 1.4.1 satisfy these power
requirements.
The Hastings 200 series flow instruments (24 Volt versions) require 14 - 32 VDC @ 1.9 Watts
(HFM-201/205) and 4.2 Watts (HFC-20203/207) for proper operation. The supply voltage should
be reasonably regulated as power supply ripple may propagate to the output. The supply common
is galvanically isolated from the signal common such that this instrument can be powered from a
bipolar 15 Volt supply using only the positive and negative output terminal (30 Volts). Surge
suppressors are recommended to prevent power spikes reaching the instrument.
The Hastings 200 series flow instruments have an integral 5 VDC reference source. This stable
voltage is on pin 15 of the DA-15 connector (pin 1 of the DE-9 for 24 Volt) and may be used for the
command voltage.
2.3. Output Signal
The standard output of the flow meter is a 0 - 5 VDC signal proportional to the flow rate. In the
Hastings power supplies, the output is routed to the display and is also available at the terminals on
the rear panel. If a Hastings supply is not used, the output is available on pin 6 of the DA-15
connector (pin 2 of the DE-9 for 24 Volt) and is referenced to pin 5 (pin 8 for 24 Volt). It is
recommended that the load resistance be no less that 2kΩ. If the optional 4 - 20 mA output is used,
the load impedance must be selected in accordance with Section 1.3.
Attempting to operate the 24 volt version for any significant length of time
the internal DC-DC convertors to fail.
Warning:
at a voltage less than the specified minimimum voltage will cause