Dr C Narain Spantech Products, South Godstone, Surrey, UK

1. Dr C Narain Spantech Products, South Godstone, Surrey, UK The exclusive representative for ACD in Europe, Middle East and India

2. ACD History • Founded in 1988 • Based in Tucson, AZ • Our goal is to research, develop and manufacture dependable, accurate, reliable and affordable gas calibration standards. • ACD have become experts and leaders in the calibration industry. • ACD manufactures and distributes the most advanced hand held gas generators available to calibrate corrosive gas sensors

3. The ACD Family

4. ACD Product range • The CAL2000 • The MiniCal • The MiniBump

5. Benefits of ACD Products • Instruments are small, light weight, durable and dependable. • Gas is generated electrochemically as needed, not stored until used, so instruments do not degrade over time. • Safe to ship, use, store and dispose of. • Our instruments save the customer time and money

6. Current solutions for toxic calibration gases Calibration gas cylinders • Unstable over even relatively short time • Leads to short shelf lives • Leads to uncertainty over actual concentrations Fixed concentrations Bulky One type of gas per cylinder

7. Current solutions for toxic calibration gases Permeation tubes • Highly temperature dependent. • High power consumption. • Cannot be turned on and off. • Mainly for laboratory use.

8. Faraday’s law: “The amount of chemical change during electrolysis is proportional to the charge passed” Electrochemical gas production

9. Variable parameters • Current supplied Use an accurate and controllable current source with microprocessor control (for CAL2000) • Amount of air blended with the gas generated in the cell Miniature mass/flow controller • Maximise the reaction efficiency

10. What determines the reaction efficiency? Electrolyte • Must be stable with time and replenishable Electrodes • Must resist oxidation (or reduction) • Must be able to carry sufficient current. Cell body • Must not leak • Should help to maintain stable cell environment • Must be mouldable.

11. Other issues Gas is produced in bubbles • We need to control the bubble size to maintain a smooth and repeatable output. Gas/electrolyte separation • The electrolyte must be separated from the electrolyte prior to mixing in air, so that it will not escape into the electrolyte bulk. We use a Teflon membrane to separate the air mixing chamber

12. The ACD solution

13. Advantages of Electrochemical Generation • Can change concentration and flow rates by changing currents and mixing rates. • A large amount of gas can be produced from a solid or gas. • Can switch reaction on and off. • Cells will last for years (if designed properly). • Cells (and instruments) are small and compact. • Low power consumption.

14. Advantages of Electrochemical Generation • Interchangeable cells. • Can be used in hazardous environments. • No temperature dependency. • Can use an inert balance gas. • Can monitor reaction voltages to check the reaction efficiencies.

15. Disadvantages of Electrochemical Generation • Limited number of gases. • Pressure sensitivity. • Can be expensive on short-term.

16. The CAL 2000 • Unmatched versatility and accuracy in corrosive calibration gases. • Field replaceable electrochemical generating cells. • Microprocessor controlled.

17. One instrument - many gases! One instrument will generate: • Chlorine • Chlorine Dioxide • Hydrogen • Hydrogen Cyanide • Hydrogen Sulphide • Bromine

18. The CAL 2000 is the most cost effective method of providing calibration gases. The CAL2000 provides 50X the amount of gas per £ vs cylinders

19. Ease of use LCD Display Field adjustable PPM and flow rate Hand held design Low power consumption Micro processor controlled operation Safety features: Cells do not degrade over time. Automatic purge on shutdown Built in mass-flow sensor that compensates for altitude and temperature Suitable for both diffusion and sample drawn systems CAL2000 Features

20. Latest News!! • CSA certified CAL2000 now available. • All sensors factory calibrated to NIST standards Coming soon: • Bromine • Ammonia

21. Chlorine - 0.5 to 50ppm Chlorine Dioxide - 0.5 to 5.0ppm Hydrogen - 0.5-50ppm Hydrogen Cyanide - 0.5 to 50ppm Hydrogen Sulphide - 0.5 to 50ppm Note: PPM is variable with flow rate, output given at 0.5 Lpm. Useful cell time: 50 hours Warm up time (to 90%) approx. 5 minutes Weight: 3 Lbs Accuracy: +/- 10% Repeatability: +/-5% Operating temperature: 0 to 50 °C Battery life 25-30 hours Specifications

22. The MiniCal • Low cost • Compact (pocket sized) • Cost effective Gases generated : • Chlorine • Hydrogen Sulphide • Hydrogen Cyanide • Hydrogen

23. CSA NTRL/C Exia intrinsically safe Automatic purge on shutdown Alkaline battery powered disposable generating cell Cell life: 2 or 10 hours Accuracy: +/- 10% Repeatability: +/- 10% Weight: 0.5 Lbs Battery life: 4-6 hours Warm up-time (to80%): 2 minutes Operating temperature: -30 to 50°C MiniCal Specifications

24. How much less does it cost to use the MiniCal compared to cylinders? • Each field replaceable cell costs about the same as a cylinder but gives 10X the gas output.

25. The MiniBump • Ultra Small Gas Generator • Designed to “bump” test sensors • Each cell costs the same as a cylinder but will give up to 1000 bump tests

26. The ACD instrument range

27. Global Service for a global market

28. Customer comments • We like your instrument and will recommend to all our customers as a reliable and easy operative source for generating Chlorine Dioxide and other gases" • - Natasha Portman, Interscan Corporation” • Thank you A.C.D., for setting a new standard in chlorine gas samples." - Terry Hebert, Dow Chemical, U.S.A.” • The MiniCals are from Heaven" - Erkki Semi, Sarlin, Finland” • We appreciate the personalised service" - Q.E.C., U.S.A.