The Contrec Model 515 (Application PP01) is a pressurised petroleum flow computer built to work with high-security quadrature flowmeters on crude oil, lube oil, and refined petroleum product lines. It calculates gross volume, net volume, and mass flow rates by taking in live pressure, temperature, and density analogue inputs.
Volume correction is done to ASTM D1250-04, the standard used for fiscal and custody transfer petroleum metering, so the numbers this unit produces are suitable for billing and allocation purposes, not just internal monitoring. It accepts dual-channel quadrature pulse inputs to ISO 6551 Level B pulse security, which checks the two pulse trains against each other so you can be confident the count hasn’t been corrupted or tampered with.
In actual application, this application code is normally paired with a quadrature-output flowmeter plus pressure, temperature, and density transmitters on the same line. The 515 has an onboard adjustable transducer excitation supply so you can power the field sensors directly, plus 4-20mA retransmission and dual RS-232/RS-485 Modbus RTU ports so it reports into your existing SCADA or DCS setup. It also keeps a built-in log of totals, averages, and alarms, so you have an audit trail if anyone questions the readings later.
Before we quote this, we would normally check the flowmeter’s pulse output type, the pressure, temperature and density transmitter ranges, and what output signals your control system needs. Hope this helps.
