3S Co., Ltd
3-Sci
A H Enterprises Inc. (AMFLOW)
Aarohi Embedded Systems Pvt. Ltd
ABB
ABM Sensor Technology, Inc.
Advanet Inc.
ADZ NAGANO GmbH 
Agar Corporation
Alsensio GmbH
AMETEK Magnetrol
Analog Devices
Anderson Instrument Co., Inc.
Anhui Chicheng Instrumentation Technology Co., Ltd.
Anhui Luoqian Control System Co., LTD.
Anhui Tiankang (Group) Shares Co., Ltd
Aparian Inc.
Aplisens  S.A.
Armstrong International
ASA S.r.l.
Ashcroft
Atomhorizon Electric
Auma
Autonics
Autrol by Duon System Co., Ltd.
Azbil Corporation
Badger Meter
Bahra Advanced Cable Manufacture Co. Ltd
Baker Hughes Oilfield Operations LLC
Baldota Control and Equipments Pvt Ltd
Barksdale Control Products
Bass Olcme Enstrumanlari Ltd. Sti.
Baumer
BD SENSORS GmbH
Beamex Oy Ab
Beckhoff Automation GmbH & Co. KG
BEIJING CONNETECH ELECTRONICS TECHNOLOGY CO., LTD.
Beijing Consen Technologies Co.,Ltd.
Beijing ConST Instruments Technology Inc.
BEIJING FAR EAST INSTRUMENT CO.,LTD
Beijing Fipor Atal Meter Co Ltd
Beijing Huade
Beijing Precision Wave Instrument Co.,Ltd
BEIJING RIPENESS SANYUAN INSTRUMENTATION CO.,LTD
Beijing Spake Technology Co., Ltd
Beijing Yanshan Times Instrument CO., LTD.
Beijing ZhongRuiZhiCheng Technology Co., Ltd.
BEKA Associates
Belden Inc.
Benway Consulting LLC
BERNARD CONTROLS
Berthold Technologies
Bilfinger Engineering & Maintenance GmbH
Binder GmbH
Bitherm
Bopp & Reuther Messtechnik GmbH
Brooks Instrument
BTG Instruments AB
Bürkert Werke GmbH & Co. KG
BusCorp Inc.
Cameron Technologies
Canada Sensors Technology Inc.
Chengdu Action Electronics Joint-Stock Co., LTD
CHENZHU INSTRUMENT 
Chongqing Aurumsense Technology Co., LTD
Chongqing ChuanYi Automation Co. Ltd 
Chongqing Chuanyi Control System Co., Ltd. Shanghai Branch
Chongqing Chuanyi Instrument No. 17 Factory Co., Ltd.
Chromalox
CI Systems Ltd.
CiDRA Corporate Services LLC
Clark-Reliance Corp.
CNOOC Safety & Technology Services Co.,Ltd
CodeWrights
CONTROL DATA SYSTEMS
Cords Cable Industries LTD.
Coto Measurement System (Shanghai) Co. Ltd.
Crowcon Detection Instruments Limited
Daehan Sensor Co Ltd
Dandong Top Electronics Instrument Group Co. Ltd
Delta Controls Corporation
Delta Mobrey Ltd
Delta-Phase Electronics
Denso Wave Incorporated
Det-Tronics
Dinel, s.r.o.
Divigraph
Doosan HF Controls Corporation
Draeger Safety AG & Co. KGaA
DVG Automation SpA
Dynisco
E. D. Engineering, Inc.
Eaton - MTL Product Line
Electro-Chemical Devices
ELEMER
Elgaz
Elimko Electronic Production & Control Co. Ltd.
Elmetro Group, Ltd
embeX GmbH
Emerson Automation Solutions
EMIS CJSC
EMKO HOLDING s.r.o.
Endress+Hauser
Enelsan Endustriyel Elektronik San. A.S.
ENOTEC GmbH
ERIS, Limited Liability Company
ESP Safety, Inc.
Eureka Industrial Equipments Pvt. Ltd.
EUROMAG INTERNATIONAL S.R.L.
Feejoy 
FELLOW KOGYO CO., LTD.
Festo SE & Co. KG
Fieldbus Center at Lee College
Fieldbus Inc.
Fieldbus International AS
FineTek Co.,
Fire and Gas Detection Technologies Inc.
FLEXIM
Flowline, Inc.
Flowserve
Fluenta AS
Fluid Components International LLC
Fluidwell
Fluke Corporation
FOCUS-ON
Forbes Marshall
Fraunhofer IOSB
FSUE SPA "Analitpribor"
Fuji Electric Co., Ltd
Fujian Wide Plus Precision Instruments Co., Ltd.
G.M. International S.r.l.
GASDNA Co., LTD
Gasensor Technology Pte Ltd
Gastech
GASTRON
GDS Instruments
GEFRAN
GEMU
General Electric
Georg Fischer Signet
Georgin
GKS
GLOAZURE CO., LTD.
Gneuss Kunststofftechnik GmbH
GODA
Goldcard
GP:50 Ltd.
HACH Company
Hamilton Bonaduz AG
Hangzhou Hollysys Automation Co. Ltd.
Hangzhou SDIC Microelectronics Inc.
Hanwei Electronics Group Corporation
Harbin East Annunciator Equipment Development co.,Ltd
Harold Beck & Sons, Inc.
Hawk Measurement Systems Pty. Ltd.
Heinrichs Messtechnik
Henan Chicheng Electric Co., Ltd
Hengyang Northern Photoelectric Information Technology Co.Ltd
HEST
HIMA Paul Hildebrandt GmbH
Hitachi High-Tech Solutions
Hitachi, Ltd.
HK Instrument (Dalian) Co., Ltd
Hoentzsch GmbH
Hoffer Flow Controls Inc.
Honeywell International
Hongrun Precision Instrument Co.,Ltd, Shunchang Fujian
Huaxin Instrument (Beijing) Co., Ltd.
HYDAC Electronic GmbH
IDEX
Ifak Technology+Service GmbH
IGM-Detector, Co. Ltd.
IMI Precision Engineering
IMTEX Controls
INCANA Instrument Co.,Ltd
Inor Process AB
Intergraph Corporation dba Hexagon PPM
Isoil Industria S.p.a.
ITEI
JEMIMA
Jiangsu Weilang Electronic Technology Co.Ltd
Jiangsu Xinhui Measurement and Control Technology Co., Ltd
Jinan Benan Technology Development Co., Ltd
Jinge
Joint Stock Company "Albatros"
JSC EPF "SIBNA"
JUMO
JUMO GmbH & Co. KG
Kaifeng Instrument Co Ltd
Kaneko Sangyo Co., Ltd.
KEI INDUSTRIES LIMITED
KEM Kueppers Elektromechanik GmbH
Kinetrol
Klay Instruments
KMITL
Knick GmbH & Co. KG
Kobold Messring GmbH
Kockumation Group
Kongsberg Maritime AS
KOREA Flowmeter Ind. Co., Ltd.
Koso Engineering Co. Ltd
KROHNE Messtechnik GmbH
KSB
KSB MIL Controls Limited
L&J Engineering Inc.
LABOM GmbH
Lapp India Pvt Ltd
LEEG Instruments 
LEONI Cables Solutions India Private Ltd.
Limaco
Linyi Anfu Electronics Co., LTD
LLC Scientific Production Association AGAT
LONHOT
LumaSense Technologies GmbH
M&M Software
Macro Technology Instruments Co., Ltd.
Magma Engineering LTD
Manometer Factory LLC
Marlew S.A.
Marmon Industrial Energy & Infrastructure
Matsushima Measure Tech Co., Ltd.
Maxonic Automation
MECON GmbH
MEGA-TEK
Meriam Process Technologies
MESC
MESCO Engineering
Metal Samples Company (A Division of Alabama Specialty Products, inc)
Metroval Controle de Fluidos Ltda
Mettler-Toledo GmbH
Mezolen Instrument (Changzhou) Co., Ltd.
Micro Sensor Co., Ltd.
Microcreative Tech. Co., Ltd.
Microcyber Corporation
Microflex
Micropack (Engineering) Ltd
MIRAX LLC
MISTRAS Group, Inc.
MITSUBISHI ELECTRIC
Mitsubishi Heavy Industries, Ltd.
Molex
Moore Industries-International, Inc. 
Motoyama Eng. Works, Ltd.
MSA
M-System Co. Ltd.
Muesen Technik GmbH
National Instruments
NEO Monitors AS
New Cosmos Electric Co., Ltd
New Power
Nippon Gear
NIVELCO Process Control Co.
Nivo Controls Pvt. Ltd.
NIVUS
NOAH ACTUATION CO.,LTD.
NOSHOK
NOVUS Produtos Eletronicos Ltda
NPP KuibishevTelecom-Metrology
NPP SENSOR LLC
Nuoan
OGMM
OKB VEKTOR
Okonite
OOO NPO Vakuummash
optek-Danulat GmbH
Optronics Technology
Otis Instruments
OVAL Corporation
PACTware Consortium
Pepperl+Fuchs SE
Petrobras
Phase Dynamics, Inc.
Phoenix Contact
Piezus Ltd
Point, LLC
POWERFLOW
Power-Genex Ltd.
Pozhgazpribor LLC
PR electronics A/S
Precision Engine Controls Corporation
Prest Measurement and Control Technology (Tianchang) Co., Ltd.
Presys
Process Level Technology, Ltd
ProComSol, Ltd.
Prosense
PT Korosi Specindo
Pulsar Measurement
Pyromation LLC
QINGDAO ADD VALUE FLOW METERING CO.,LTD.
QOT Inc.
R. Stahl GmbH
RAMCRO S.p.A.
Relcom
Research and Production Complex "VIP", JSC (AO "NPK VIP")
REXA, Inc.
Rheonics
Rheonik
Rhosonics Analytical BV
RIIT Ltd.
Riken Keiki Co., Ltd.
Rittmeyer AG
Rockwell Automation
Rohrback Cosasco Systems
Ronan Engineering
Rotex 
Rotork Controls
Rotork YTC Limited
Sage Metering, Inc.
Samil PNU
SAMSON AG
Satron Instruments Inc.
SBEM Pvt. Ltd.
ScanSense AS
Schneider Electric
SENKO
Sense Electronica Ltda.
Seojin Instech Co., Ltd
Shandong Dongrun
Shanghai Aegis Industrial Safety Corporation
Shanghai Analog & Digital Instrument Co., Ltd
Shanghai Automation Instrumentation Co.,Ltd
Shanghai Guanghua Instrument Co.,Ltd.
Shanghai Jingpu Mechanical & Electrical Technology Co.,Ltd. 
Shanghai Rocksensor Automation Co., Ltd.
Shanghai Welltech Automation Co., Ltd
Shanghai Xingshen Instrument Co.,Ltd
Shanghai Yinuo Instrument Co., LTD
Shell Global Solutions
Shenzhen ExSaf Industrial Technology
SHENYANG LANSHEN INSTRUMENT CO., LTD
Shenyang Vibrotech Instruments INC
Shenzhen ExSaf Electronics Co., Ltd.
Shenzhen MORC Controls Co.,Ltd
SICK Engineering GmbH
Siemens AG
SINIER(NANJING)PROCESS CONTROL CO.,LTD.
Sinoto Instrument (SU ZHOU) Co., LTD
SkoFlo Industries, Inc.
SMAR
Smart Embedded Systems Inc.
SMARTY LLC
SMC Corporation
SME “TEC”, Ltd.
Softdel Systems Pvt Ltd - not one on memb. app
Softing AG
Spectrum Controls
Spirax Sarco
Springfield Research Corp.
S-Products
STI Srl
Suzhou Beite Smart Instrument Co., Lt
SUZHOU BONRAY MEASURE & CONTROL EQUIPMENT CO.,LTD
SWAN Analytical Instruments
SWISA Instrument Inc.
Syscor Controls & Automation Inc.
Taian Panran Measurement & Control Sci-Tech Co., Ltd
Tecfluid S.A.
Tefulong (Shanghai) Technologies Co., Ltd.
TEKAB CO, LTD.
Tek-Trol
Telebyte, Inc.
Teledyne
Temposonics LLC
Teplokontrol
TERMOTRONIC LLC
TERRANOVA
The Open Group - The Open Process Automation Forum
Thermal Instrument Co.
Thorsis Technologies GmbH
TISSIN
TLV
TOKYO KEIKI INC.
TOKYO KEISO
TOSHIBA
Toshniwal Industries Private Limited
Tracerco
Tyco Fire & Security GmbH
UBC Intelligent Technology (Xi'an) Co., Ltd
UFRGS
Uniphos Envirotronic Pvt. Ltd.
United Electric Controls
Universal Flow Monitors
Utthunga
UWT GmbH
Vaisala Oyj (didn't list one)
Val Controls A/S
Valcom Co., Ltd
Valmet, Inc.
Valtek Sulamericana
VEGA Grieshaber KG
Vivace Process Instruments
VORTEK FLUID INC.
Vzljot
Walsn
Waseda University
WECAN PRECISION INSTRUMENTS
Welkin Co., Ltd.
WeMetro Industrial Control Equipment Co. Ltd.
Westcontrol AS
Westlock Controls
Wetcon
WIKA  Alexander Wiegand SE & Co. KG
Wilcoxon Sensing Technologies
WISE CONTROL INC
Wuxi GLT Safety Equipment Co., Ltd
Wuxi Kunlun Fuji Instruments Co., Ltd.
Xi'an Dechuang Electrical Technology Co.,L
Xi'an Dongfeng Machinery & Electronic Co., Ltd
Xian International Instrument Measure & Control Co.Ltd
Yangzhou Electric Power Equipment Manufacture Factory CO,LTD
Yangzhou Hengchun Electronics Co., Ltd.
Yokogawa Electric Corporation
YW-VRV INDUSTRIES CO,.Ltd
Zhejiang AoXin Instrument Co., Ltd.
Zhejiang Diyuan Instrument Co., Ltd
Zhejiang Hengjun automation equipment Co., Ltd
Zhejiang Jinghua Measurement and Control Equipment Co., Ltd
Zhejiang JingLiang Automation Co., LTD
ZHEJIANG JINLONG AUTOCONTROL EQUIPMENT CO.,LTD.
Zhejiang Jinyee Instrument Co., Ltd.
Zhejiang SUPCON Technology Co., Ltd.