UNSPSC 41103325: Visual fluid flow apparatus

A type of device that enables to see the fluid flow with the bare eyes. Clear pipes are made in several units and let the fluid to flow inside for many experiments of flow velocity, pressure, flux and others.

UNSPSC 41103325 Visual fluid flow apparatus (Commodity) covers gas flow calibrators, mass flow terminals, zero air generators, and related measurement and verification equipment that state and local environmental and water agencies procure to calibrate, certify, and maintain air quality and water meter monitoring networks. Work under the code includes procurement of primary flow standards for laboratory calibration, portable and stationary gas generators, meter verification and certification services, replacement parts for monitoring equipment, and preventative maintenance and repair services. Issuing bodies include state environmental protection agencies, water districts, and county governments. The Texas Commission on Environmental Quality (TCEQ) is a repeat buyer, having posted multiple solicitations for gas flow calibrators and mass flow terminals within recent months. Eastern Municipal Water District (EMWD) in Riverside County, California has solicited meter verification, calibration, certification, and repair services. Illinois Environmental Protection Agency and Riverside County also source equipment and parts under this code to support their monitoring infrastructure.

Recent activity concentrates in Texas, California, and Illinois. The TCEQ Air Monitoring Division issued RFB 582-26-15780 (posted June 30, 2026, due July 7, 2026) for gas flow calibrators including Mesa Metrology Series ML-800 Base units and coated flow cells; bids must comply with NIST traceability and EPA gas verification protocols, with delivery required within 60 days to Austin, Texas, and Texas bidders eligible to claim preferences under 34 TAC Rule 20.38. The TCEQ also posted RFB 582-26-15424 for a Molbox2-A700K mass flow terminal (due March 31, 2026) serving as a primary flow standard for the Calibration Laboratory. EMWD issued RFP 3856 (due July 15, 2026) seeking proposals for meter verification, calibration, certification, preventative maintenance, and repair services across its Riverside County service territory. The Illinois EPA procured zero air generators through a sole-source Basic Ordering Agreement valued at $59,100.00 (posted March 12, 2026), and replacement parts for Teledyne air quality monitoring equipment through a sole-source procurement valued at $43,780.00 (posted March 2, 2026). Riverside County issued RFB 3909 (due February 13, 2026) for Cla-Val parts inventory supply.