| Manufacturer country / location | Manufacturer | Certificate No | | | Issue date | Apparatus | |
|---|
| 77 |  Australia |  |
| 1 | Austria | |
| 5 | Belgium | |
| 32 | Canada | |
| 36 | China | |
| 1 | Czech Republic | |
| 8 | Denmark | |
| 5 | Finland | |
| 25 | France | |
| 267 | Germany | |
| 7 | India | |
| 2 | Ireland | |
| 2 | Israel | |
| 19 | Italy | |
| 50 | Japan | |
| 50 | Korea, Republic of | |
| 1 | Latvia | |
| 1 | Mexico | |
| 1 | New Zealand | |
| 15 | Norway | |
| 5 | Poland | |
| 2 | Russian Federation | |
| 4 | Singapore | |
| 4 | South Africa | |
| 2 | Spain | |
| 17 | Sweden | |
| 20 | Switzerland | |
| 2 | Thailand | |
| 6 | The Netherlands | |
| 1 | Turkey | |
| 330 |  United Kingdom | |
| 2 | | ABB Limited | |
| 1 | | Allenwest Wallacetown Limited | |
| 1 | | Alpha Moisture Systems | |
| 5 | | Asco Joucomatic Limited | |
| 16 | | ATB Laurence Scott Limited | |
| 3 | | ATB Morley | |
| 1 | | ATB Morley | |
| 16 | | ATB Morley Limited | |
| 1 | | ATB Morley Ltd | |
| 1 | | Bedford Opto Technology Limited | |
| 6 | | BEKA associates Limited | |
| 1 | | Bifold Fluid Power | |
| 4 | | Cable Management Products Limited | |
| 1 | | Capcis Limited | |
| 4 | | Chalmit Lighting | |
| 3 | | City Technology Ltd | |
| 11 | | CMP Products Limited | |
| 6 | | Controlled Systems Limited | |
| 1 | | Cooper Crouse-Hinds (UK) Ltd | |
| 1 | | Cooper Crouse-Hinds (UK) Ltd or | |
| 1 | | Cooper Crouse-Hinds (UK) Ltd | |
| 4 | | Crowcon Detection Instruments Limited | |
| 8 | | 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 | | 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 | | 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 | |
| 1 | | Joy Mining Machinery | |
| 1 | | Joy Mining Machinery Limited | |
| 1 | | Joy Mining Machinery Ltd | |
| 2 | | K Controls Limited | |
| 1 | | KAC Alarm Company Limited | |
| 1 | | K&TC Manufacturing Ltd | |
| 1 | | LMK Thermosafe Limited | |
| 2 | | Longvale Limited | |
| 29 | | Measurement Technology Limited | |
| | | IECEx BAS 06.0041 issue 4 | |  | 01/30/2008 | MTL4511 / MTL4514 / ... | |
| | | IECEx ITS 08.0025X issue 2 | |  | 09/12/2008 | MTL621 Intrinsically... | |
| | | IECEx BAS 07.0071 issue 1 | | | 07/18/2008 | MTL5549 2 Channel Is... | |
| | | IECEx ITS 08.0025X issue 0 | | | 08/06/2008 | MTL621 Intrinsically... | |
| | | IECEx BAS 07.0067 issue 1 | | | 01/30/2008 | MTL5511 / MTL5514 / ... | |
| | | IECEx KEM 08.0008X issue 0 | | | 07/10/2008 | Model MTL661, Model ... | |
| | | IECEx BAS 04.0036 issue 1 | | | 04/02/2008 | MTL5061 Two Channel ... | |
| | | IECEx ITS 08.0026X issue 2 | | | 09/12/2008 | MTL623 Intrinsically... | |
| | | IECEx BAS 05.0055 issue 1 | | | 11/05/2008 | MTL5043 Repeater Pow... | |
| | | IECEx BAS 08.0105 issue 0 | | | 12/15/2008 | MTL4541A Single Chan... | |
| | | IECEx BAS 08.0030 issue 0 | | | 05/28/2008 | MTL5526 Two Channel ... | |
| | | IECEx ITS 08.0025X issue 1 | | | 08/26/2008 | MTL621 Intrinsically... | |
| | | IECEx BAS 05.0065 issue 1 | | | 04/02/2008 | MTL5021 / MTL5025 Lo... | |
| | | IECEx ITA 08.0009X issue 0 | | | 10/13/2008 | MTL55xx range of Bar... | |
| | | IECEx BAS 08.0032 issue 0 | | | 07/16/2008 | MTL5501-SR Failsafe ... | |
| | | IECEx ITS 08.0026X issue 1 | | | 08/26/2008 | MTL623 Intrinsically... | |
| | | IECEx BAS 08.0031 issue 0 | | | 07/16/2008 | MTL4501-SR Failsafe ... | |
| | | IECEx ITS 08.0026X issue 0 | | | 06/16/2008 | MTL623 Intrinsically... | |
| | | IECEx ITS 08.0023 issue 1 | | | 08/26/2008 | MTL620 Intrinsically... | |
| | | IECEx BAS 08.0029 issue 0 | | | 05/28/2008 | MTL4526 Two Channel ... | |
| | | IECEx BAS 05.0066 issue 1 | | | 04/23/2008 | MTL5022 Loop Powered... | |
| | | IECEx BAS 07.0070 issue 1 | | | 11/24/2008 | MTL5546 Single Chan... | |
| | | IECEx BAS 07.0069 issue 1 | | | 01/10/2008 | MTL5541 / MTL5544 Re... | |
| | | IECEx BAS 06.0035 issue 5 | | | 11/24/2008 | MTL4546 / MTL4546C S... | |
| | | IECEx BAS 08.0106 issue 0 | | | 12/15/2008 | MTL5541A Single Chan... | |
| | | IECEx BAS 06.0034 issue 5 | | | 01/10/2008 | MTL4541* / MTL4544 R... | |
| | | IECEx ITS 08.0024 issue 0 | | | 08/06/2008 | MTL622 Intrinsically... | |
| | | IECEx BAS 06.0036 issue 4 | | | 07/18/2008 | MTL4549 & MTL4549C 2... | |
| | | IECEx FME 08.0001X issue 0 | | | 10/14/2008 | MTL4850 32 Channel H... | |
| 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 | |
| 1 | | 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 | |
| 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 | |
| 265 | United States of America | |
| 1,263 | | |