Baldwin SR-4 Type HF Fluid Pressure Cell PSI-20K NOS
Up For Sale:
1 Baldwin-LIMA-Hamilton SR-4 Fluid Pressure Cell, NOS.
Type - HF
CAP. PSI - 20,000
The Baldwin SR-4 Pressure cell translates changes in pressure into changes in voltage. The sensing element of the cell is a pressure sensitive tube, to the outside of which are bonded special SR_4 resistance wire strain gages.
These gages are electrically connected in the form of a a balanced Wheatstone Bridge. A constant voltage is applied across opposite of the bridge so that a change in pressure in the cell, changing the resistance of the gages, will produce a change in output voltage from the bridge. This change in output voltage may be measured by an indicator, recorder, etc. which is calibrated in units of pressure or any convenient units.
While the SR-4 pressure cell is ruggedly built, care must be taken not to damage it mechanically or by excessive overload if its inherent accuracy is to be preserved.
1000 psi, 2000 psi, 5000, 10000, 20000. The two lower capacity cells have a pressure sensing element made of beryllium copper. The other three of high strength tool steel. The natural mechanical frequency of these cells is in the range of 40,000 to 50,000 cycles per second, and this frequency can be approached in actual service by filling the cavity with a grease such as dow-corning DC_4, Kel F, Celvacene, or Tiolene, taking care to avoid trapping any air bubbles.
Electrically, type HF cells have a higher bridge resistance (500 Ohms) and 1.5 mv/v output at capacity pressure. This permits the use of higher input voltages, resulting in higher output and with the same minimum warmup drift. Output of these cells is sufficient to power an oscilloscope directly. without pre amplification.
Guaranteed to work, Sold with 14 days Warranty.
Thank for looking, Buy with confidence.
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On Jul-28-08 at 08:03:15 PDT, seller added the following information:
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