Emergent Metering
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VP Instruments

Thermal mass flow meters for compressed air, nitrogen, and industrial gases — inline and insertion models that turn plant-air load into billable demand.

About VP Instruments

VP Instruments specializes in thermal mass flow measurement for compressed air, nitrogen, and other industrial gases. Compressed air is frequently the single most expensive utility in a plant on a per-unit-of-energy basis, yet it is the least measured — most facilities have no idea which departments or machines consume it, or how much of it leaks away overnight.

The VPFlowScope family measures mass flow, pressure, and temperature simultaneously in one instrument, in both inline and hot-tap insertion configurations. Insertion probes can be installed under pressure on an existing header, which means the plant does not have to shut down air to begin measuring it — a decisive advantage on continuous-process sites.

Emergent Metering uses VP Instruments meters to build compressed-air accountability programs: baseline total generation at the compressor room, submeter each branch or department, quantify off-shift leak load, and convert cubic feet of air into the kilowatt-hours and dollars the compressors actually burn producing it.

Choosing a VPFlowScope In-line

SizeOrder codeDimensionsWeightBest for
0.5 inchVPS.R080.M050135 × 50 × 85 mm0.7 kg (1.54 lb)Point-of-use on small branches and single machines
1 inchVPS.R250.M100135 × 55 × 91 mm0.7 kg (1.54 lb)Departmental branches and larger single loads
2 inchVPS.R01K.M200155 × 90 × 125 mm1.6 kg (3.58 lb)Main branches and higher-flow headers

Specifications

  • Four measurements in one instrument: mass flow, pressure, temperature and total flow
  • 16 bar (250 psi) standard, with a 35 bar (500 psi) upgrade available
  • RS485 Modbus RTU, 4–20 mA and pulse output standard on every model
  • Three display options per size, including a model with a built-in two-million-point data logger
  • Bi-directional flow measurement available as an option
  • Patented Thermabridge technology for dry, clean gas measurement
  • Compressed air plus nitrogen, oxygen, CO₂, helium and argon
  • Every unit ships with an ISO calibration report

Figures from the VP Instruments VPFlowScope In-line brochure. Download the VP Instruments datasheets

VP Instruments FAQ

What does the VPFlowScope In-line measure?
It is a 4-in-1 sensor: mass flow, pressure, temperature and total flow, measured simultaneously in a single instrument. That matters because compressed air cost analysis needs all four — flow alone cannot tell you whether a change in consumption came from demand or from a pressure change upstream.
Which gases can it measure?
Compressed air plus other dry, non-corrosive industrial gases, including nitrogen, oxygen, CO₂, helium and argon. Specify the gas at order so the instrument is configured correctly.
What pressure ratings are available?
Two versions: 16 bar (250 psi) and 35 bar (500 psi), which covers the large majority of plant compressed-air systems.
How does the data get out of the meter?
RS485 Modbus RTU, 4–20 mA and pulse output are all standard, so the instrument integrates with a building automation system, a data logger or an energy management platform without an added converter. An optional 3-line LCD display gives local readout and configuration, and an optional built-in data logger stores two million points for standalone studies with no network at all.
What is bi-directional flow measurement and why does it matter?
Bi-directional measurement, available as an option, detects air flowing in either direction through the pipe. Reverse flow happens more often in real compressed-air systems than most operators expect — around ring mains, shared headers and receivers — and a meter that cannot see it will silently overstate consumption.
What is the VPFlowScope typically used for?
Compressed-air submetering, leak management, energy monitoring, departmental cost allocation, industrial gas submetering, and condition monitoring of pneumatic equipment. It is most often specified at point-of-use on smaller diameters, where a plant needs to know what an individual machine or line actually consumes.

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