特點：
Features:0-50 ppb to 0-2,000 ppb ranges, user selectable
Microprocessor controlled
Multi Tasking software allows viewing test variables while operating
Continuous self checking with warning alarms
External converter
Designed to optimize response times
Minimal surface area in contact with sample
Low absorption wetted parts
Heated sample manifold
Adaptive filtering optimizes response time
Temperature & pressure compensation
Internal data logging with 1 min to 24 hour averages
Specifications參數(shù):
Ranges: 0-50 to 0-2,000 ppb, operator selectable; Dual ranges and auto-ranging supported
Units: ppb, ppm, �g/m3, mg/g3 operator selectable
Zero noise: < 0.5 ppb (RMS)
Span noise: < 0.5% of reading (RMS) above 50 ppb
Lower Detectable Limit (LDL): 1 ppb
Zero drift: 0.5 ppb/24 hours, < 1.0 ppb/7 days
Span drift: < 1% of reading/24 hours, < 2% of reading/7 days
Lag time: 40 seconds
Rise and Fall Time: 90% in 120 seconds
Linearity: < 1% of full scale
Precision: 0.5% of reading
Sample Flow Rate: 1000 cc/min �10%
Operating Temperature Range: 10 - 30� C
Dimensions (HxWxD): 7� (178 mm) x 17� (432 mm) x 23.5� (597 mm)
Weight: Analyzer - 43 lbs (21 kg)External pump - 16 lbs (7 kg)
Power: 100V 50/60 Hz, 115V 60Hz, 220V 50/60Hz, 230V 50Hz, 240V 50Hz250 Watts (analyzer), 250 Watts (pump)
Analog outputs: 10V, 5V, 1V, 0.1V, selectable
Recorder Offset: �10%
Serial Outputs: RS-232 (DB-9)
Status (Digital): 12 outputs from optoisolator, included with standard configuration
Current Output: 0-20 mA or 4-20 mA isolated outputs (optional)
Approvals: CE
其他：
The Model 201E NH3analyzer measures ambient ammonia in selectable ranges from 0-50 ppb to 0-2,000 ppb using the chemiluminescence principle and an API designed external ammonia converter and sampling system.Ranges are user selectable in 1 ppb increments and auto ranging is available. Ammonia is difficult to measure accurately because of a tendency to be absorbed into other materials. The �stickiness� of the gas results in slow response times and inaccurate concentration values. The Model 201E has been designed to overcome the problems of ammonia gas analysis through increased flow, minimum surface area and selected construction materials.In operation, sample gas is passed through the M501NH converter, which converts NH3 and other compounds to NO, producing the total oxides of nitrogen (TNX). In the next cycle the sample is routed through a molybdenum converter which converts nitrogen oxides (less NH3) to NO, producing the Tn reading. The difference between these readings (TNX � TN = NH3) provides a reading proportional to the NH3concentration.The analyzer software represents these values in the readout, and independent outputs are available for each of these values. The Model 201E combines the performance advantages of Teledyne API�s Model 200E NO/NOX analyzer with a converter sampling system designed specifically for this application to produce the most accurate and dependable NH3 measurement system available today.
