Environmental Monitoring


Common pollutants in air are oxides of nitrogen emitted by car exhausts, which are toxic and can cause acid rain and other damage to the environment, as well as risks to health. In a NOx analyser, a sample of exhaust gas is mixed with ozone, producing a chemiluminescent reaction.

The light emitted is measured by a photomultiplier and the concentration of the NOx gases is determined. This application requires a red-sensitive photomultiplier.

SOx gases can also be detected with this technique. Very low concentrations can be detected, down to the ppb level. The most sensitive systems require the use of cooled photomultiplier detectors which can be supplied to special order.

The presence of harmful bacteria in water can be detected with rapid microbiology techniques, using luminometers.


Detector ModulesDetector Modulesenvironmental monitoringHV Power BasesLINX rangeLuminometer
Photon Counting Modules




type


effective
cathode
dia. mm



cathode
type

spectral response
range nm

typical
dark
counts@
20°C

max
count
rate MHz



output signal



outline
drawing



data
sheet

P25PC  22  bialkali 280 to 630 100 s-1 100 TTL    
P25PC-16  22  S20 300 to 850 100 s-1 100 TTL    
P25USB  22  bialkali 280 to 630 100 s-1 100 USB    
P25USB‾01  22  S20 300 to 850 100 s-1 100 USB    
P30PC 25 bialkali 280 to 630 100 s-1 100 TTL    
P30PC-01 25  S20 300 to 850 100 s-1 100 TTL    
P30USB 25 bialkali 280 to 630 100 s-1 100 USB    
P30USB-01 25 S20 300 to 850 100 s-1 100 USB    
DM0016C 22 bialkali 280 to 630 50 s-1 70 TTL    
DM0087C 22 S20 300 to 850 50 s-1 70 TTL    
DM0089C 22 bialkali 280 to 630 50 s-1 70 USB    
DM0090C 22 S20 300 to 850 50 s-1 70 USB    

Examples of Analogue Modules




type


effective
cathode
dia. mm



cathode
type


spectral
response
range nm


amplifier
bandwidth
MHz



outline
drawing



data
sheet

P25A 22 bialkali 280 to 630 100    
P25A-11 22 S20 300 to 850 100    
P25N 22 bialkali 280 to 630  -    
P25N-02 22 S20 300 to 850  -    
P25P-07* 22 bialkali 280 to 630  -    
P25P-09* 22 S20 300 to 850  -    
P30A-03 25 bialkali 280 to 630 30    
P30A-05 25 S20 300 to 850 30    
P30PVN-31 25 bialkali 280 to 630  -    
P30PVN 25 S20 300 to 850  -    
P30CW5* 25 bialkali 280 to 630  -    
P30CW5-07* 25 S20 300 to 850  -    
DM0036C 22 bialkali 280 to 630 20    
DM0088C 22 S20 300 to 850 20    

* can be used for pulse counting, analogue detection or photon counting