City Technology launches hydrogen sulphide sensor with reduced cross-sensitivity to methanol – the 7HH/LM

Citation

(2001), "City Technology launches hydrogen sulphide sensor with reduced cross-sensitivity to methanol – the 7HH/LM", Sensor Review, Vol. 21 No. 3. https://doi.org/10.1108/sr.2001.08721cad.016

City Technology launches hydrogen sulphide sensor with reduced cross-sensitivity to methanol – the 7HH/LM

City Technology launches hydrogen sulphide sensor with reduced cross-sensitivity to methanol – the 7HH/LM

Keyword: Gas sensors

City Technology announces the launch of a new, high sensitivity hydrogen sulphide sensor, the 7HH/LM CiTiceL®, with reduced cross-sensitivity to methanol (Plate 15). The result of an extensive development programme at City's dedicated research facility in Portsmouth, UK, it offers a significant performance advantage over its standard CiTiceL counterparts.

Plate 15 The new hydrogen sulphide sensor from City Technology

This high output sensor is ideally suited to incorporation into portable and fixed safety instruments used in environments with background levels of alcohols or organic vapours. Such applications include cold environments, with temperatures as low as 40°C, where methanol is commonly used as a solvent in de-icing agents.

Standard H₂S sensors used in such applications are subject to cross-sensitivity to methanol and related alcohols that can give rise to costly false alarms. But this new CiTiceL, with a modified sensing electrode formulation, has very low activity for methanol oxidation. In addition, the internal design has been modified to minimise the migration of alcohol to the reference electrode.

Performance features

The 7HH/LM functions over a nominal range of 0-50ppm with a maximum overload of 500ppm. It has a fast response time, T⁹⁰ <30 seconds, and excellent stability with a typical drift of <2 per cent signal loss per month. It has an extensive operating temperature range from –40°C to +50°C.

The 7HH/LM comes in the standard 7 Series compact format, making it an easy drop-in replacement for standard 7 Series sensors. With its proven patented design, OEMs can be confident from the outset in the sensor's robustness and high performance.

David Baines, sales and marketing director, said:

False alarms caused by background levels of alcohols will be a thing of the past for users of safety instruments containing the new 7HH/LM. The development of this new sensor illustrates City's commitment to responding to OEM's requirements, enabling them to produce application-specific instruments. Its proven design makes for easy integration and improved product performance for their customers.

More information on the 7HH/LM and the full range of over 200 sensors from City Technology can be found on the Web site at: www.citytech.com