1. www.hvac.vn Differential Pressure ATEX Enclosures The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes. Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2014 Dwyer Instruments, Inc.

2. www.hvac.vn Overview Magnehelic® AT22000 Photohelic® AT3A3000 AT23000MR Digihelic® AT2DH3 Switches AT21823 AT11910 AT1ADPS Transmitters AT2MS AT2605

3. www.hvac.vn ATEX Housing Rating II 2 GDEx d IIC Gb T6, -50°C≤Ta≤+60°C Ex tb IIIC Db T85°C ATEX flame proof against: Gas, Vapors, Mist, Dust Alcohol, Aromatics, Propane, Methane, Ketones, Wood Dust, Coal Dust, etc

4. www.hvac.vn ATEX Housing Rating Limits damage and propagation of fire in the event of failure or combustion Contains and quenches any flame Gases/dust may be present but not all the time Temperature ratings Gases: ambient temperatures up to 60 ° C Dust: ambient temperatures up to 85 ° C

5. www.hvac.vn ATEX Housing Options Enclosure options: Blind or glass top SS or brass pressure connections Overpressure relief valve

6. www.hvac.vn Magnehelic® Series AT22000 Gage differential pressure indication with scale ranges from 60 Pa (0.25 INWC) to 30 kPa (120 INWC)

7. www.hvac.vn Photohelic® Series AT3A3000 Offers gage differential pressure indication with 2 DPDT latching relays in scale ranges from 60 Pa (0.25 INWC) to 30 kPa (120 INWC)

8. www.hvac.vn Photohelic® Series AT23000MR Gage differential pressure indication with 2 SPDT relays in scale ranges from 60 Pa (0.25 INWC) to 30 kPa (120 INWC) Low Voltage Power

9. www.hvac.vn Digihelic® Series AT2DH3 Digital differential pressure indication with 2 SPDT relays and an adjustable 4 to 20 mA output, in scale ranges from 60 Pa (0.25 INWC) to 35 kPa (100 INWC) Display measurement modes for pressure, air velocity, and volumetric flow

10. www.hvac.vn Switches Series AT21823 Differential pressure switch with set point ranges from 17 Pa (0.07 INWC) to 21 kPa (85 INWC) SPDT rated 15 A @ 120- 480 VAC ±2% FS repeatability

11. www.hvac.vn Switches Series AT21900 Differential pressure switch with set point ranges from 17 Pa (0.07 INWC) to 4.9 kPa (20 INWC) SPDT rated 15 A @ 120- 480 VAC ±3% FS repeatability

12. www.hvac.vn Switches Series AT2ADPS Differential pressure switch with set point ranges from 20 Pa (0.08 INWC) to 5 kPa (20 INWC) SPDT rated 1.5 A @ 240 VAC Indicating set point adjustment knob

13. www.hvac.vn Transmitters Series AT2MS Digital differential pressure indication with analog output, in scale ranges from 25 Pa (0.1 INWC) to 5 kPa (25 INWC) Display measurement modes for pressure or air velocity Analog outputs 4 to 20 mA, 0 to 5 V, or 0 to 10 V

14. www.hvac.vn Transmitters Series AT2605 Gage differential pressure indication with 4 to 20 mA output, in scale ranges from 60 Pa (0.25 INWC) to 500 Pa (2 INWC)

15. www.hvac.vn Applications Hazardous Area Air Flow Measurement: Coal Mine Ventilation Air Flow Wastewater Treatment Ventilation Oil Refinery Ventilation

16. www.hvac.vn Applications Air Scrubber Monitoring Maintain DP across scrubber for efficiency

17. www.hvac.vn Applications Coal Power Plant Dust Collection Log DP for environmental agencies and control filter cleaning

18. www.hvac.vn Applications Hazardous area HVAC systems: Filter monitoring Blower vacuum monitoring Fan pressure indication Duct static, room, or building pressures