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301/303/305/306/307 Flowmeters and Controllers Instruction Manual
2. Installation and Setup
This section contains the necessary steps to install a new flow meter/controller into operation as quickly and
easily as possible. Please read the following thoroughly before attempting to install the instrument.
Receiving Inspection
Prior to opening, inspect for obvious signs of damage to the shipment. Immediately advise the carrier who
delivered the shipment if any damage is suspected. If the shipment has arrived intact, carefully unpack the
instrument and any accessories that have been ordered. Check each component shipped with the packing list.
Ensure that all parts are present (i.e., flowmeter, controller, power supply, cables, etc.). Optional equipment
or accessories will be listed separately on the packing list. There may also be one or more OPT (option) items
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 instrument.
1. Ensure flow circuit mechanical connections are leak free
2. Ensure electrical connections are correct (see label).
3. Allow 30 min. to 1 hour for warm-up.
4. Note the flow signal decays toward zero.
5. Run ~20% flow through instrument for 5 minutes.
6. Insure zero flow; wait 2 minutes, then zero the instrument.
7. Instrument is ready for operation
Power Requirements
At their maximum power draws, the HFM-301/305/306/307 meters require ±15 VDC @ 70 mA, and the HFC-
303/307 controllers require ±15 VDC @ 185 mA (See specifications in sections 1.2). The HFM-300/HFC-302
Series supply voltages should be reasonably regulated as power supply ripple may propagate to the output (less
than 50 mV ripple is preferred). 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 in section 1.4.1
are limited to no more than 150VA max and it satisfy all the recommended requirements. If using non-Hastings
power supplies with 300 Series instruments, it is strongly advised that they meet the recommendations in
section 1.4.1. The specs given earlier state the max assuming a 0.026" sensor and 4-20 mA output. In addition
to the specs reported in 1.2, the table below may be useful (the table assumes a 0.026" sensor):
NOTICE: Use of an underpowered or under-voltage supply could result in equipment damage.
Output Signal
The standard output of the flow meter is a 0-5 VDC signal proportional to the flow rate. In 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 and is referenced to pin 5.
It is recommended that the load resistance be no less than 2kΩ. If the optional 4-20 mA output is used, the
load impedance must be selected in accordance with Section 1.3.
EAR99 Technology Subject to Restrictions Contained on the Cover Page
Quick Start
Recommended Current Draws for 300 Series Instruments
Instrument Type\Analog Output
Meter, ±14-16 VDC @
Controller, ±14-16 VDC @
0-5 V
4-20 mA
55 mA
70 mA
170 mA
185 mA
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