ABB NU8976A99 HIER466665R0099 HIEE320693R0001 power module

ABB NU8976A99 HIER466665R0099 HIEE320693R0001 power module

Technical data of product parameters

Both LFSs are located in a temperature-controlled room where the air temperature is maintained at 21 ± 1.5 o
Therefore, steady state temperature conditions are achieved by cycling the piston back and forth at the intended
calibration flow, which promotes mixing of the fluid. Thermal equilibrium on the 0.1 L/s LFS is further enhanced by
forcing the calibration fluid through an outer cylindrical jacket that encloses the cylinder and piston. The liquid flow from NU8976A99 HIER466665R0099 HIEE320693R0001
the pumps is directed into this outer jacket before entering the four-way diverter valve. The 0.1 L/s LFS uses twelve
temperature sensors to determine fluid properties throughout the flow loop. The 2.5 L/s LFS uses ten temperature sensors
and four pressure sensors. Placement of these sensors measures changes in density in the connecting volume between the
cylinder and the MUT and the resulting corrections for storage effects. This is discussed further in section 5.
The position of the piston along the cylinder length is measured with two, redundant linear encoders, one on each of the NU8976A99 HIER466665R0099 HIEE320693R0001
supporting shafts attached to either side of the piston. The encoders output approximately 50 square wave pulses per mm
of length traveled. The time for the piston to travel a given length is measured by counting pulses from two redundant
2.5 MHz timers (see section 5.2).
Leaks of calibration fluid can be visually detected. There are two wiper seals on the piston, one on the leading edge, NU8976A99 HIER466665R0099 HIEE320693R0001
another on the trailing edge. Fluid that leaks past either of these seals flows through machined holes in the piston and
piston shafts to the shaft ends where it will drip out. Leaks past the piston shaft seals and from pipe fittings are easy todetect by eye. Because leaks are detected and repaired, errors resulting from undetected leaks are small enough to be
neglected during uncertainty analysis. To determine if a visible leak is significant, a graduated cylinder is used to collect
the leaking fluid during the collection of a calibration flow point. If the collected volume is a large enough percentage of
the volume through the MUT to increase the uncertainty in the measurement by more than 50 parts in 106
, it is repaired before the LFS is used again

Product picture display

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This article from the temporal Ming sheng automation equipment co., LTD.,

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