Overview

RKI Instruments designs and manufactures gas detection equipment for hazardous gas monitoring across utilities, mining, fire services, and pharmaceuticals. Based in Union City, California, the company was founded in 1994 and operates as the North American subsidiary of Riken Keiki Company, Ltd. With 100–200 employees and estimated revenue of $10–50 million, RKI offers portable and fixed multi-gas monitors, single-gas detectors, and wireless monitoring systems. In March 2026, the company introduced the GX-6100 six-gas sample draw monitor to its product lineup.

At a glance

What RKI Instruments, Inc. makes

The company manufactures portable instruments, fixed multi-point systems with wired and wireless options, and specialized sensor technologies for monitoring oxygen, carbon monoxide, hydrogen sulfide, methane, and volatile organic compounds.

Products and capabilities described on the company's own site include Sensor, Pump, Battery, Semiconductor (source: rkiinstruments.com).

Certifications

RKI Instruments, Inc. is associated with the following certifications in public sources. Confirm the certified scope for the specific plant producing your part:

• ISO 9001 — wasabisys.com

Latest developments

• 2026-09-14 — RKI Instruments Names PK Safety #1 Distributor Again (pksafety.com)

• 2026-06-10 — RKI to exhibit at ASSP 2026 Conference & Expo | RKI Instruments (rkiinstruments.com)

• 2026-03-17 — Announcing the GX-6100 –  Six Gas Sample Draw Monitor  | RKI Instruments (rkiinstruments.com)

• 2025-12-04 — RKI Branch Office in Gulf Coast Region | RKI Instruments (rkiinstruments.com)

• 2025-10-16 — 🎉 Big news! RKI Instruments is expanding into the Gulf Coast with the grand opening of our new Deer Park, Texas office on October 29, 2025! 🌟 (linkedin.com)

• 2025-10-16 — Exciting news! RKI’s new office opens on October 29th! 🎉 | RKI Instruments, Inc. (linkedin.com)

Facilities

RKI Instruments, Inc. is headquartered in Union City, California. Public sources also reference these locations:

• California — energytechreview.com

Company details

RKI holds ISO 9001 certification and operates as the North American subsidiary of Riken Keiki Company, Ltd. RKI Instruments, Inc. was founded in 1994, has an estimated 100-200 employees, and is headquartered in Union City, California. On the LightSource stability read it is rated "Established & active": 32 years in operation (founded 1994). Holds ISO 9001 certification(s) per public sources.

Frequently asked questions

What does RKI Instruments, Inc. make?

RKI Instruments designs and manufactures gas detection equipment for hazardous gas monitoring across utilities, mining, fire services, and pharmaceuticals. Based in Union City, California, the company was founded in 1994 and operates as the North American subsidiary of Riken Keiki Company, Ltd. With 100–200 employees and estimated revenue of $10–50 million, RKI offers portable and fixed multi-gas monitors, single-gas detectors, and wireless monitoring systems. In March 2026, the company introduced the GX-6100 six-gas sample draw monitor to its product lineup.

Where is RKI Instruments, Inc. headquartered?

RKI Instruments, Inc. is headquartered in Union City, California (33248 Central Ave, Union City, California, 94587).

When was RKI Instruments, Inc. founded?

RKI Instruments, Inc. was founded in 1994.

How big is RKI Instruments, Inc.?

RKI Instruments, Inc. has an estimated 100-200 employees, with revenue in the $10-50M range (estimated).

What certifications does RKI Instruments, Inc. hold?

RKI Instruments, Inc. lists ISO 9001 on its website. Confirm the certified scope for the specific plant producing your part.

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Last verified Nov 2026. Is this your company? Request a correction.