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Copyright ©1998-2004:
AMKO Systems Inc.
All rights reserved.


CLD 770 AL ppt
NITROGEN OXIDE ANALYZER

cld770alppt1.jpg (10990 bytes)Eco Physics' unique nitrogen oxide analyzer provides for the first time continuous, exact determination of concentrations in the ppt (parts per trillion) range. The extremely high sensitivity is guaranteed by a separate reaction chamber (to offset cross sensitivity) and state-of-the-art signal filtering. With this hundredfold increase in sensitivity, the CLD 770 AL ppt opens up new dimensions in monitoring air quality, making it ideal for use in determination of required mean annual NO2 values.

The Eco Physics CLD 770 AL ppt excels not only in its high measuring sensitivity but also in its construction. The orderly layout guarantees exactly defined reaction conditions, while the temperature and pressure parameters, which have to be precisely maintained, are monitored by sophisticated sensors and kept within narrow tolerance levels. The construction, as an assembly of individual modules such as the preliminary reaction chamber, the main reaction chamber, the ozone generator, etc. allows fast and simple maintenance.

cld770alppt2.JPG (11613 bytes)In cooperation with the renowned Julich (FRG) research centre, Eco Physics has developed the unique CLD 770 AL ppt measuring system with two reaction chambers in series. The main reaction chamber supplies the NOtot (measuring phase 1) and NOCtot (measuring phase 3) signals. In the pre-reaction chamber, the NOtot (measuring phase 2) and NOCtot (measuring phase 4) signals are produced using the differing reaction rates. In measuring phases 3 and 4, a photolytic converter converts existing NO2 molecules into NO. A microprocessor analyzes the digitized signals to report reliable measuring values. As the Eco Physics CLD 770 AL ppt shows, chemiluminescene detection (CLD) is the preferred method for measurements in the ppt range.

Technical Specifications

Measurement ranges: [ppb] 0.005 to 5 }
0.01 to 10 } The signal integration interval can
0.05 to 50 } be varied in increments of 1 second
0.1 to 100 } (from 1 to 600 secs) for each range.
0.5 to 500 }
Minimum detectable concentration: < 50 ppt for an integration time of 30 sec
< 15 ppt for an integration time of 600 sec
Noise (at zero, ± 2 sigma [ppb]): ± 50 (at signal integration time of 30 sec)
Signal noise: noise at zero (see above) or < 0.5% of signals (at a signal integration interval of 30 sec) whichever is greater
Lower detectable limit: ± 2 sigma [ppb]: < 0.100 (at a signal integration interval of 30 sec);

< 0.030 (at a signal integration interval of 600 sec)
Zero drift: No zero drift because of compensation through the pre reaction chamber
Zero Point Deviation [ppb]: negligible
Linearity (in range): ± 1% of measuring range
Rise time (internal): < 1 sec to achieve 98% of end value in response to a step change in sample concentration alone
Fall time (internal): < 1 sec (see Rise time)
Response time: when 'measuring continuously', < 1 sec [see Op. Instr. section 5.2.2.2 window (5)] in 'NO' and 'NO.c' modes: ^... 4 sec.
Temperature range: 15-35 °C
Humidity tolerance: 5-95% rel. humidity (not condensing)
Sample flow: 1500 ml/min ± 100 ml/min
Flow rate ozone generator: 75 ml/min
Power required: approx. 150 VA (with pump and ozone destroyer 950 VA)
Supply voltage: 230 V/50 Hz (± 10%),
  115 V/60 Hz (± 10%)
Interfaces: RS 232 (RS 485 optional)
Analog output: 0 - 1 V / 0.2 - 1 V / 0 - 10 V / 2 - 10 V (into min. 600 k)
0 - 20 mA / 4 - 20 mA
(load impedance max. 600 k non-isolated)
Photomultiplier temperature: - 100 C, selectable
Photomultiplier chamber flush: 15 mL/min (dry air)
Interferences [%NO2 equivalent]:  

NH3:

 < 1

SO2:

 < lower detectable limit

water vapor:

 1% vol H2O vapor in sample gas reduces
NO/NOx 0 signal by 8%
HNO3 (same conc. as NO2) < 1,
NO3/N2O5/HO2NO2/CLONO2/PAN < 1, HONO < 20
Pump: Vane-type rotary vacuum pump
Dimensions: Height: 133 mm (5 1/4"=3 HE, with stand 6.22"),
Width: 482 mm (19")
Depth: 546 mm (21 1/2")
Weight: 24 kg (52 lbs), Pump 24 kg
Delivery includes: Analyzer CLD 770 AL ppt, ozone destructor, pump, filter, tubes, power cables, analog cable, RS-232 cable, manual