Pressure Measurements

An electronic pressure scanning system (EPS) is the primary means for acquiring pressure data. It can support customer-supplied EPS modules from Scanivalve or Pressure Systems Inc. UWAL has two Scanivalve EPS modules: 1) 128-port, 5-psi range module using 64 transducers, Model ZOC 33; 2) 32-port, 0.72-psi range module, Model ZOC 23B. Both modules have an accuracy of 0.05% of the full-scale range. The system can be automatically calibrated in a matter of minutes. This system allows simultaneous recording of up to eight modules. Quick disconnects can be sent to the customer for plumbing of model pressures prior to model delivery.

32-port, 0.72-psi EPS Module

128-port, 5-psi EPS Module

UWAL also has an assortment of 1, 2.5, and 5 psi differential pressure transducers available for use. Each transducer is calibrated on-site with a secondary pressure standard traceable to a primary standard.

In order to use the EPS modules, the model must use pressure tubing that has an outside diameter of approximately 0.040 to 0.042 inches. Stainless steel tubing is normally used to make the pressure ports in the model. Urethane tubing connects the steel pressure port tubing to the EPS module. Urethane and bulged stainless steel tubing are available from the Scanivalve Corporation (800-935-5151). Urethane tubing is stronger, more resilient to bending, and fits better than other types of flexible tubing.