Dresser Roots Model 5 Prover Manual - The Meter and Valve ...

18. Controller – An aluminum or steel rectangular box with a 6 in. finned heat sink on the sideof the box and a number of sockets for electrical and computer connections.19. Blowers -– Devices attached to the Prover cart, responsible for producing a source ofairflow during Prover testing.20. Master Meter(s) – The reference meter (tertiary standard) with known performancecharacteristics that is traceable to national and international standards. The Prover may bepurchased with one or two Master Meters.21. Master Meter Cable – A cable containing a 6-pin connector at each end.22. Master Meter Junction Box – A rectangular box mounted to the end cover of theMaster Meter(s).23. Throttle Valve – An electrical actuator used to aid in the flow rate control for the prover.1.4 Optional Accessories:• Optical Scanner• ROOTS 8C Meter Test Hardware Assembly• ROOTS Series B3 Field CTR Pulser (MTR must be “Pulser Ready”)• Acoustic Filter• Inverter• 3" Quick-disconnect Connector (Female)• 3" Quick-disconnect Connector (Male)• SmartProve Cable• USB Serial Port Converter Kit1.5 Theory of OperationThe Prover operates as a transfer test. The meter under test (Field Meter) registers volume and comparesit to the volume registered by a Master Meter. Blowers are used to pull a vacuum, which draws ambientair into the Field Meter and through a connecting hose directly into the Master Meter.In the normal test set-up, the mass of air passes through the meter under test and then through the MasterMeter. Since the Master Meter’s characteristics are known, the meter under test can be characterized basedon the difference in its performance parameters as compared to the Master Meter. This difference inperformance is expressed in terms of accuracy (proof and percent error are also displayed).1.6 Precautions• No copies of this disk or any of the information contained there on shall be usedfor any purpose other than to operate the Model 5 ROOTS Prover.• Do not operate the Model 5 ROOTS Prover in the presence of flammable gas oran explosion may result.• Do not operate the Model 5 ROOTS Prover in the rain or while standing in waterin order to avoid a potential electrical shock.• Check upstream and downstream blocking or bypass valves to ensure that they operateproperly and are leak tight in the closed position before powering any device.5