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Currently experiencing very long- and uncertain lead times for all N901 components, please consult factory.

Model N901
THC-CH4-NMHC Analyzer
with NumaView™ Software​



092910910B - MANUAL, USER, N901.pdfN901 with NumaView™ Software Manual7281 KB
NVS Remote Manual - 08492.pdfNumaView™ Software Remote User Guide867 KB
SAL000076K - Environmental Instruments Overview.pdfEnvironmental Instruments Overview610 KB
SAL000113B_N901_THC-CH4-NMHC_DATASHEET.pdfN901 Specifications793 KB
Teledyne API N Series Ambient Brochure_17-Dec-2021.pdfN Series Instruments for Ambient Air Monitoring Brochure11385 KB
Teledyne-N-Series-CEMS-Brochure-Final-01-14-21.pdfN Series Instruments for Continuous Emissions Monitoring (CEM) Brochure11049 KB


​​​ ​Detector
​Flame Ionization Detector (FID)
​ Method
Gas Chromatography with CH4 separation column
 Ranges (Methane)
Min: 0-5 ppm
Max: 0-1,000 ppm
 Lower Detectable Limit
<25 ppb (Methane); <25 ppb (Propane)
 Cycle Time
60 sec (minimum), user-definable
<1% of reading or 0.05 ppm (whichever is​ greater)
​<1% of full scale
 Zero Drift
Zero baseline performed once per cycle
 Span Drift (24hr)
<1% of full scale
 Sample Flow Rate
60 cc/min + 10%
 Carrier Gas
50 to 70 psi​, N2 UHP Grade, Consumption 20 cc/min
 Fuel Gas
50 psi ± 5%, H2 UHP Grade, Consumption 35 cc/min
 FID Air
50 psi ± 5%, HC Free clean air, Consumption 350 ​cc/min
 Auxiliary A​ir
70 psi ± 5%,​ Clean Dry Air, Consumption 1 cc/actuation
 Included I/O
1 x Ethernet (TCP/IP)
1 x RS232
2 x front panel USB device ports​
​​ Optional I/O

​Universal Analog Output Board includes (all user-definable):
4 x Isolated Voltage Outputs (5V, 10V; user-selectable)
3 x Individually Isolated Current Outputs (4-20mA)
​Digital I/O Expansion Board includes:
3 x Isolated Digital Input Controls
5 x Isolated Digital Output Controls (user-definable)
3 x Form C Relay Alarm Outputs (user-definable)
 Dimensions (HxWxD) 7” x 17” x 23.5” (178 x 432 x 597 mm)
35 lbs (16 kg)
​​ Operating Temperature
​​​ Power
100-240V, 50/60Hz, Typical Power 130W​
​ Warranty
​​Two years

Specifications subject to change without notice.
All specifications are based on constant conditions.​​


  • ​60s default cycle time
  • 25 ppb LDL (CH4, NMHC) ​
  • Fully programmable and automated directly from the instrument front panel interface
  • Modular internal hardware design for ease of maintenance
  • All internal components operate on 24VDC
  • Front panel USB connections for peripheral devices and firmware upgrades
  • Real-time chromatogram display during calibration routine
  • Real-time graphical displays of concentrations and diagnostic parameters
  • Comprehensive internal datalogging with programmable averaging periods
  • Ethernet and Serial outputs, standard
  • Analog output and digital I/O expansion (options)
  • Internal pressurized span valve for auto calibration (option)​​


The Model N901 is a near-continuous hydrocarbon gas analyzer that measures the concentration of Methane (CH4) and Total Hydrocarbons (THC) in air. The concentration of the non-Methane (NMHC) component is calculated by the subtraction of CH4 from THC, with high sensitivity and accuracy. The hydrocarbons are measured using a Flame Ionization Detector (FID), in combination with gas chromatography (GC). The instruments range and performance are tuned specifically for use in ambient air quality monitoring assessments.

The Model N901 is designed for simple operation and maintenance with a modular hardware and electronics architecture.  A long-life stainless-steel fritted filter is used at the sample intake to effectively remove particulate matter without introducing any gas-phase measurement artifacts. Instrument operation, calibration functions, chromatogram views,​ and data handling are all automated and controlled using the internal NumaView™​ Software (NVS) interface, without the need for an external PC.​

For remote connection to the N901 instrument, Teledyne API's NumaView™ Remote PC-based Software provides a virtual interface, instrument controls, and data downloading capability to all TAPI analyzers operating NumaView™ Software.