| Applicant country / location | Applicant | Certificate No | | | Issue date | Manufacturer | Apparatus | |
|---|
| 102 |  Australia |  |
| 1 | Austria | |
| 7 | Belgium | |
| 25 | Canada | |
| 32 | China | |
| 1 | Czech Republic | |
| 8 | Denmark | |
| 5 | Finland | |
| 26 | France | |
| 272 | Germany | |
| 7 | India | |
| 2 | Ireland | |
| 2 | Israel | |
| 19 | Italy | |
| 48 | Japan | |
| 50 | Korea, Republic of | |
| 1 | Latvia | |
| 2 | New Zealand | |
| 15 | Norway | |
| 5 | Poland | |
| 2 | Russian Federation | |
| 4 | Singapore | |
| 4 | South Africa | |
| 1 | Spain | |
| 16 | Sweden | |
| 17 | Switzerland | |
| 2 | Thailand | |
| 6 | The Netherlands | |
| 1 | Turkey | |
| 322 |  United Kingdom | |
| 2 | | ABB Limited | |
| 1 | | Allenwest Wallacetown Ltd | |
| 1 | | Alpha Moisture Systems | |
| 5 | | Asco Joucomatic Limited | |
| 16 | | ATB Laurence Scott Limited | |
| 1 | | ATB Morley Limited | |
| 13 | | ATB Morley Limited | |
| 1 | | ATB Morley Ltd | |
| 1 | | Bedford Opto Technology Limited | |
| 6 | | BEKA associates Limited | |
| 1 | | Bifold Fluidpower Limited | |
| 4 | | Cable Management Products Limited | |
| 1 | | Capcis Limited | |
| 4 | | Chalmit Lighting | |
| 3 | | City Technology Limited | |
| 11 | | CMP Products Limited | |
| 6 | | Controlled Systems Limited | |
| 3 | | Crowcon Detection Instruments Limited | |
| 9 | | Crowcon Detection Instruments Ltd | |
| 2 | | David McClure Limited | |
| 2 | | Detectronic Limited | |
| 1 | | Don Electronics Limited | |
| 1 | | Draeger Safety UK Ltd | |
| 3 | | Druck Limited | |
| 1 | | Druck Ltd | |
| 1 | | Dynament Limited | |
| 3 | | e2v Technologies (UK) Limited | |
| 2 | | Elite Transducers Limited | |
| 10 | | Eltron Chromalox | |
| 1 | | Eltron Chromalox Ltd. | |
| 1 | | Emerson Process Management Distribution Ltd. | |
| 1 | | EnerSys Inc. | |
| 1 | | Enersys Limited | |
| 3 | | EXHEAT LIMITED | |
| 3 | | EXHEAT Ltd | |
| 1 | | Fraser Anti-Static Techniques Limited | |
| 1 | | Gai-Tronics (A Division of Hubbell Limited) | |
| 1 | | Gas Measurement Instruments Ltd | |
| 1 | | Gas Measurements Instruments Ltd | |
| 2 | | GDS Technologies Limited | |
| 1 | | Hadar Lighting limited | |
| 2 | | Hadar Lighting Ltd | |
| 5 | | Hansford Sensors Limited | |
| 19 | | Hawke International | |
| 1 | | Hohner Automation Limited | |
| 2 | | Honeywell Analytics Limited | |
| 1 | | Honeywell Analytics Ltd | |
| 1 | | Honeywell Analytics Ltd. | |
| 1 | | Hosiden Besson Limited | |
| 1 | | Hydramotion Limited | |
| 1 | | IMO Precision Controls Ltd | |
| 3 | | Intecpc Limited | |
| 4 | | Intecpc Limited | |
| 2 | | Ion Science Ltd | |
| 2 | | ITT Flow Control Ltd | |
| 2 | | K Controls Ltd | |
| 1 | | KAC Alarm Company Limited | |
| 1 | | K&TC Manufacturing Ltd | |
| 1 | | LMK Thermosafe Limited | |
| 2 | | Longvale Limited | |
| 28 | | Measurement Technology Limited | |
| 1 | | Measurement Techology Limited | |
| 1 | | MEDC Limited | |
| 1 | | Micropack Engineering Ltd. | |
| 5 | | Mobrey Limited | |
| 1 | | Mobrey Ltd. | |
| 2 | | Monitran Limited | |
| 3 | | Newson Gale | |
| 2 | | Parker Hannifin (UK) Limited | |
| 1 | | Parson Peebles Generation Limited | |
| 2 | | PCME Limited | |
| 2 | | Pepperl + Fuchs GB Limited | |
| 1 | | Petrel Limited | |
| 1 | | Pipelines 2 Data | |
| 2 | | Procal Analytics Limited | |
| 3 | | Pyroban Limited | |
| 1 | | Pyroban Ltd | |
| 1 | | Pyroban Ltd UK | |
| 4 | | Raxton Limited | |
| 2 | | Redapt Engineering Company Limited | |
| 1 | | Redapt Limited | |
| 1 | | Rota Engineering Limited | |
| 8 | | Rotork Controls Ltd | |
| | | IECEx SIR 04.0003X issue 4 | |  | 01/17/2008 | Rotork Controls Ltd | IQ Range of Electric... | |
| | | IECEx SIR 04.0001X issue 5 | |  | 11/05/2008 | Rotork Controls Ltd | IQT Range of Electri... | |
| | | IECEx SIR 04.0002X issue 5 | | | 11/05/2008 | Rotork Controls Ltd | IQT Range of Electri... | |
| | | IECEx SIR 04.0004X issue 2 | | | 01/17/2008 | Rotork Controls Ltd | IQ Range of Electric... | |
| | | IECEx SIR 04.0004X issue 3 | | | 11/05/2008 | Rotork Controls Ltd | IQ Range of Electric... | |
| | | IECEx SIR 04.0003X issue 5 | | | 11/05/2008 | Rotork Controls Ltd | IQ Range of Electric... | |
| | | IECEx SIR 04.0001X issue 4 | | | 01/17/2008 | Rotork Controls Ltd | IQT Range of Electri... | |
| | | IECEx SIR 04.0002X issue 4 | | | 01/17/2008 | Rotork Controls Ltd | IQT Range of Electri... | |
| 1 | | Sensor Systems Watchman Ltd | |
| 6 | | Servomex Limited | |
| 1 | | Shaw Moisture Meters | |
| 3 | | Signature Industries Limited | |
| 8 | | Signature Industries Ltd | |
| 1 | | SKF Condition Monitoring Centre (Livingston) Ltd | |
| 1 | | Status Scientific Controls Limited | |
| 2 | | Swagelok Limited | |
| 9 | | Technolog Limited | |
| 2 | | Thorn Security Limited , T/A Tyco Safety Products | |
| 1 | | Thorn Security Limited, T/A Tyco Safety Products | |
| 3 | | Thorn Security Ltd, T/A Tyco Safety Products | |
| 3 | | Tracerco | |
| 6 | | Trolex Limited | |
| 1 | | Tyco Valves and Control Ltd. | |
| 1 | | T.E.L. Engineering Limited (Trading as Trolex Engineering) | |
| 1 | | Victor Lighting | |
| 1 | | Victor Products | |
| 1 | | Victor Products Limited | |
| 4 | | Walsall Limited | |
| 4 | | Westlock Controls Limited | |
| 1 | | Westlock Controls Ltd. | |
| 2 | | Weston Aerospace Limited | |
| 1 | | Wolf Safety Lamp Company Limited | |
| 258 | United States of America | |
| 1,263 | | |