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TURBINE FLOWMETERS BY
HOFFER
Perfecting Measurement
TM
CRYOGENIC PROVER
Product Bulletin SY-14B-01
TECHNICAL DATA SHEET
CRYOGENIC TRANSFER
STANDARD FOR FIELD
CALIBRATIONS OF BULK
TRANSPORT SYSTEMS
The dream of a quick, simple, and
reliable field calibration system for
cryogenic flowmetering systems
has become a reality with the
introduction of the Hoffer SY-14B
Cryogenic Transfer Standard.
When suitably documented by a
NIST traceable laboratory, the
system offers users a high
accuracy standard of comparison
to allow adjustment of bulk
transport mounted systems.
Maintaining accuracy to the
requirements of Handbook 44/OIML
was never so easy.
Historically, the accuracy of
flowmetering systems for bulk
transports has been verified by
comparing the metered delivery
with the net weight delivered on a
certified truck scale. To eliminate
road loss errors, the bulk transport
had to pump, while on a weigh
scale, into a second empty
transport off the weigh scale. The
low precision resulting from scale
inaccuracy and resolution
necessitated very large sample
sizes and lack of control in pumping
rates. In addition, the weight
measurements could not be made
while pumping. This resulted in a
time-consuming process where the
pump was started and stopped
repeatedly and which tied up the
two trailers and the weigh scale for
typically four hours per calibration
check. In addition, when finished,
both trailers had to be filled before
going to their next delivery. With the
Hoffer SY-14B Cryogenic Transfer
Standard these problems are
eliminated. First, only the trailer to
be tested need be present in most
cases. The discharge from the
trailer is pumped from the
transport to the SY-14B and back
through the top fill connection to
the trailer.
The system includes a transfer
standard turbine flowmeter and a
metering run mounted on a hand
truck and an electronics console
for portability. The electronic por-
tion of the prover is provided in a
small portable electronics
enclosure with military style quick
disconnect electrical fittings.
Instantaneous indication of the
flowrate and flowing temperature
is provided as well as a total flow
indicator, and an accumulative
test total indicator. Temperature
compensation for LIN, LOX and
LAR, and other product types are
provided to allow the total display
to be in mass or volumetric units.
A prover cable interconnects the
transfer standard to the trailer's
meter system. A prover switch on
the SY-14B simultaneously starts
and stops both systems electro-
nically. The integrally mounted
control valve allows the operator to
simulate the typical flowrates and
delivery pressures to be seen in
actual service. You do not have to
shut the pump down between test
runs.
For additional information and rep-
resentative test procedures on how
you can reduce calibration costs
while exceeding legal metrology
requirements, contact our appli-
cations group. Hoffer offers on site
liquid cryogenic calibration service,
certified traceable to NIST on any
cryogenic metering system, inquire
for additional information.
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