Piston Prover Flow Meter Calibration

Piston prover calibration is the gold standard for low-to-medium flow gas measurement. By displacing a precisely known volume of gas with a calibrated piston over a measured time interval, piston provers achieve the highest accuracy available for calibrating thermal mass flow meters, mass flow controllers, delta-P flow meters, and MEMS-based instruments.

Tactical Flow Meter's piston prover system covers a wide dynamic range — from 1 SCCM up to 50,000 SCCM — using multiple range provers, all traceable to NIST standards with ±0.1% of reading accuracy.

Piston Prover Specifications

Specification	Details
Flow Range — Low	1 SCCM – 1,000 SCCM
Flow Range — Mid	1,000 SCCM – 10,000 SCCM (1–10 SLM)
Flow Range — High	10,000 SCCM – 50,000 SCCM (10–50 SLM)
Test Gases	Air, Argon, CO2, Helium, Hydrogen, Nitrogen
Accuracy	±0.1% of Reading
Traceability	NIST Traceable
Meter Types	Thermal MFM, Thermal MFC, Delta-P MFM, Delta-P MFC, Thermal MEMS

How Piston Prover Calibration Works

A piston prover consists of a precision-bore cylinder with a low-friction piston. Gas flows through the meter under test and into the prover cylinder, pushing the piston at a rate determined by the flow. Optical or magnetic sensors detect when the piston passes known positions, and the elapsed travel time over a known volume gives a highly accurate volumetric flow rate.

This volumetric rate is converted to mass flow using the gas's density at measured temperature and pressure, producing a NIST traceable mass flow reference that can be directly compared against the meter's output.

Flow Ranges & Applications

Specification	Details
1 – 1,000 SCCM	Lab instruments, semiconductor process gas, MFC verification, micro-flow applications
1,000 – 10,000 SCCM	Industrial MFCs, process control instruments, analytical equipment
10,000 – 50,000 SCCM	High-flow thermal meters, bulk gas delivery, industrial process lines

Gases Calibrated

•       Air — standard reference gas, instrument air systems

•       Argon — semiconductor process gas, welding, analytical

•       CO2 — industrial process, beverage, environmental monitoring

•       Helium — leak detection, semiconductor, cryogenic systems

•       Hydrogen — fuel cells, refining, chemical production

•       Nitrogen — purging, blanketing, semiconductor, pharmaceutical

Meter & Controller Types Calibrated

•       Thermal Mass Flow Meters (MFM) — capillary and bypass types

•       Thermal Mass Flow Controllers (MFC) — with integrated control valve

•       Delta-P (Differential Pressure) Mass Flow Meters and Controllers

•       Thermal MEMS Flow Meters — chip-scale and miniaturized instruments

Industries Served

•       Semiconductor & Electronics — process gas control for CVD, ALD, etch, and implant

•       Pharmaceutical & Biotech — gas flow in fermentation, lyophilization, and cleanrooms

•       Research & Development — laboratory instrument calibration

•       Specialty Gas Distribution — cylinder fill verification and custody transfer

•       Fuel Cell Technology — hydrogen flow measurement and control

•       Environmental & Emissions — reference standard calibration for monitoring instruments

NIST Traceability & Documentation

All piston prover calibrations are NIST traceable. Each certificate documents: gas identity and purity, temperature and pressure at time of calibration, flow points tested, piston prover volume and timing data, meter output, deviation, K-factors or correction curves, and expanded uncertainty statement. Certificates are accepted for ISO 9001, FDA 21 CFR, and semiconductor fab compliance.

Request Piston Prover Calibration

Send us your thermal MFM, MFC, delta-P instrument, or MEMS flow meter for rapid, accurate calibration. We support both OEM production calibration runs and individual instrument recalibration.

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