FlowMarket
Where to source pressure and flow sensors: FlowMarket is a B2B sourcing network powered by an AI agent. You describe the measurement — medium, measuring range, required accuracy, process connection, temperature, output signal and approvals — and the AI agent matches you with verified instrumentation manufacturers and distributors, then requests prices, datasheets and lead times from every match at once. Getting matched is free for buyers.
Sourcing pressure and flow instrumentation
Pressure and flow are the two measurements almost every process depends on — hydraulics, pneumatics, water treatment, dosing, filtration, HVAC, food and chemical production. Unlike a switching sensor, these devices are chosen almost entirely by the medium and the process conditions rather than by the mechanics of the machine.
That is why the same nominal specification can produce wildly different quotes. A 0–16 bar transmitter for compressed air and one for a corrosive chemical at 120 °C share a range and nothing else. State the medium first — it eliminates more unsuitable suppliers than any other single fact.
Pressure measurement
Transmitters, switches and gauges
A pressure transmitter outputs a continuous signal — 4–20 mA, 0–10 V or IO-Link — and is what you want for control or monitoring. A pressure switch only signals a threshold, which is cheaper when all you need is an alarm or interlock. Mechanical gauges remain the simplest local indication and often sit alongside a transmitter.
Reference types
- Gauge pressure — relative to ambient; the default for most industrial applications.
- Absolute pressure — relative to vacuum; needed where atmospheric variation matters.
- Differential pressure — across a filter, pump or orifice; also used for level in closed tanks.
- Flush diaphragm — for viscous, crystallising or hygienic media where a port would clog.
Flow measurement
Choosing by medium
Electromagnetic meters are the standard for conductive liquids such as water and slurries and have no moving parts or pressure drop. Ultrasonic clamp-on meters measure without cutting the pipe. Thermal mass meters suit compressed air and gases. Coriolis meters measure true mass flow and density with the highest accuracy — and the highest price. Mechanical turbine and oval-gear meters remain economical for clean liquids and oils.
Installation matters as much as the meter
Most flow meters need a straight run of pipe upstream and downstream to give their stated accuracy — commonly ten diameters in and five out. If your pipework cannot provide that, say so in the request: it steers suppliers toward meter types that tolerate disturbed flow rather than ones that will quietly under-perform.
What to specify when sourcing
Include all of this and the quotes become directly comparable:
- Medium — fluid or gas, viscosity, conductivity, particles, corrosiveness, hygienic requirements.
- Measuring range — normal operating point plus minimum and maximum, and any overpressure.
- Accuracy — required uncertainty; over-specifying accuracy is a common cost driver.
- Process connection — thread or flange type and size, or hygienic clamp fitting.
- Temperature & pressure — of the medium and the ambient environment.
- Output & power — 4–20 mA, 0–10 V, IO-Link, HART, pulse or switching; two- or three-wire.
- Wetted materials — stainless, Hastelloy, PTFE seals, and any material compatibility constraints.
- Approvals — ATEX/IECEx for hazardous areas, PED, hygienic (EHEDG/3-A), drinking water, calibration certificate.
Why buyers use FlowMarket for instrumentation
Instrumentation is where the specification, not the part, decides who can supply. Manufacturers each cover a slice of the medium/range/approval space, and no keyword search reveals which one covers yours. Describing the measurement once and having it reach every capable supplier gets you comparable quotes — and often a suggestion of a cheaper measuring principle you had not considered.