Intek RheoVac 950A - Manual (Page 5)

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1.3 PRINCIPLE OF OPERATION
The Rheotherm flow sensor is calibrated to measure the total mass flow of the gaseous water
vapor/air mixture. From the other three measurements, the RheoVac electronics converts the
total gas mass flow signal from the probe into two components, air mass flow rate and water
vapor mass flow rate.
The RheoVac system is fully calibrated at the factory under dynamic fluid conditions identical to
those within the power plant vacuum line. Field adjustments are not required, with the exception
of line size.
1.4 TECHNICAL SPECIFICATIONS
1.4.1 Sensor (Probe) Specifications
Primary Calibration Accuracy:
±5% of total mass flow
Repeatability:
±0.5% of reading
Operating Temperature:
Electronics: 40 to 120ºF (5 to 49ºC)
Probe: 40 to 160ºF (5 to 71ºC)
Never subject probe to temperatures above 210ºF (99ºC)
Operating Pressure:
0.5 to 10 inches Hg absolute
15 psi maximum
Storage Temperature:
-20 to 210ºF (-29 to 99ºC)
Storage Pressure:
15 psig (maximum)
Process Connection:
Hot tap assembly
(1½” thread-o-let must be welded to pipe for hot tap installation)
Wetted Surface:
300 Series SS and engineered plastic
1.4.2 Main Electronics (Remote or PC) Signal & Data Access
Local Display:
Back-lit LCD
Selectable display of air in-leakage and 6 additional instrument output parameters
Parameter scrolling
Metric/English units
Input Power:
100-250 Vac, 50/60 Hz
Signal Output or Data Access:
RS-232/RS-422/Serial Modbus, Ethernet, TCP/IP
Eight 4-20mA signals (optional)
Wireless (Optional)
OPC (Optional)
Temperature Environment:
Operating: 40 to 120°F (5 to 49°C)
Storage: -20 to 210°F (-29 to 99°C)