Pellistor Gas Sensors (Micropel, Miniature Citipel, Citipel)

Pellistors employ catalytic combustion to measure combustible gases or vapors in air up to the Lower Explosive Limit of the gas. The standard sensor consists of a matched pair of elements, typically referred to as a detector and compensator (reference element). The detector comprises a platinum wire coil embedded within a bead of catalytic material. The compensator is similar except that the bead does not contain catalytic material and as a consequence is inert.

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Availability: Commercially Available

+49 (0) 228 52 66 40
Justus-von-Liebig-Str. 22,
53121 Bonn, Germany
www.citytech.com
Manufacturer
City Technologies
Product Name
Pellistor Gas Sensors (Micropel, Miniature Citipel, Citipel)
Detection Category
Chemical
Detection Principle
Sensors;
Detection Method
Catalytic Bead Sensor ;
Application
Gas Analysis;
Equipment Type
Sensor
Product Synopsis
Pellistors employ catalytic combustion to measure combustible gases or vapors in air up to the Lower Explosive Limit of the gas. The standard sensor consists of a matched pair of elements, typically referred to as a detector and compensator (reference element). The detector comprises a platinum wire coil embedded within a bead of catalytic material. The compensator is similar except that the bead does not contain catalytic material and as a consequence is inert.
Availability
Commercially Available
Technology Readiness Level (TRL)
9
User Feedback Sources
Indifferent/No user feedback
Dimensions
Micropel: .67 x .67 x .16 in (16.9 x 17 x 4 mm) Miniature Citipel: .8 x .8 x .82 in (20.4 x 20.4 x 20.9 mm) Citipel: .44 x .44 x .45 in (11.05 x 11.05 x 11.55 mm)
Weight
<1 lb.; Dependent on sensor, most 24g
Power Requirements
AC/DC Line Power; Dependent on sensor, 3.3-4.25 VDC
Transportability
Pocket Size
Ruggedness
Extreme Temperatures/Humidity
Operating Conditions
-20 to 55°C, 0-90% RH
Consumables
<$1,000/year; Calibration gases
Calibration Schedule
Yes
Shelf Life
<6 months; Dependent on sensor, most 3-6 months in sealed container
Maintenance Cost
Calibration supplies
Other Chemical Targets
Combustible gases, Methane
Sample Introduction
Vapor/Gas
Sensitivity/Detection Limits
%LEL
Known Interferents/Inhibitors
Some compounds will decompose on the catalyst and form a solid barrier over the catalyst surface. This action is cumulative and prolonged exposure will result in an irreversible decrease in sensitivity. The most common of these substances are: lead or sulfur containing compounds; silicones; phosphates. Certain other compounds, especially hydrogen sulfide and halogenated hydrocarbons, are absorbed or form compounds that are absorbed by the catalyst. The resultant loss of sensitivity is temporary and in most cases a sensor will recover after a period of operation in clean air.
Response Time (Sample Application To Output)
Continuous (<30 seconds); <20 seconds
Alarm Capability
Signal output
Training Required
<1 week training
Manuals Available
Specification sheets
Warranties
Dependent on sensor, most 12 months
IATA Shipping Restrictions
Yes; calibration gases
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