​Model T701

​​​Zero Air System



  • Standard two year warranty
  • Long life scrubbers for SO2, NO, NO2, O3, H2S, and NH3
  • Optional CO or CO and Hydrocarbon scrubber
  • Automatic water drain
  • Automatic pump control based on flow demand
  • May be used to provide combustion air for FID (with HC Scrubber option)
  • Source of purge air for permeation tube ovens
  • Zero air for Ozone Generators


07825F - MANUAL, T701-T701H_701-701H.pdfT701/T701H Manual3666 KB
ESD Fundamentals - 04786.pdfFundamentals of Electro-Static Discharge (ESD)216 KB
SAL000076K - Environmental Instruments Overview.pdfEnvironmental Instruments Overview610 KB
SAL000083E - T701.pdfT701 Specification489 KB
SAL000083F-CN T701.pdfT701规格 (Chinese Specification)641 KB


Output 18 SLPM at 30 psig
Max Delivery Pressure 35 psig
Dewpoint -20ºC up to 15 SLPM/-10ºC above 15 SLPM
Dryer Regenerative heatless dryer with lifetime of greater than 5 years
Output Concentration SO2 < 0.1 ppb
H2S < 0.1 ppb
NO < 0.1 ppb
NO2 < 0.1 pp​b
NH3 < 0.1 ppb
O3 < 0​.4 ppb
CO < 20 ppb (requires optional scrubber)
Hydrocarbons < 5 ppb (requires optional scrubber)
Compressor Dual-cylinder, internal long-life, oil-less piston pump
Power Requirements 110V-120V, 60 Hz
220V-240V, 50/60 Hz
Operating Temperature Range 5 - 40ºC
Dimensions (HxWxD) 8.75” x 17” x 28” (22.2cm x 43.2cm x 71.12 cm)
Weight 56 lbs (25.4 kg) without options
Included I/O

Specifications are subject to change without notice.
All specifications are based on constant conditions.​
1 x Ethernet: 10/100Base-T
1 x RS232 (300-115,200 baud)
MODBUS Protocol Support


The T701 adds Modbus TCP/IP connectivity to the proven reliability and performance of our zero air systems.  This allows remote monitoring of key instrument functions including dewpoint status, scrubber temperature, box temperature, and output pressure.  Additionally, this digital access provides the ability to remotely disable the internal pump, allowing longer service intervals and less power consumption.  The user can also remotely start instrument warm-up prior to arrival at the site.

The T701 is a fully self-contained source of clean, dry air for dilution calibrators. It can also be used to create purge air for permeation tube ovens or burner air for FID analyzers.  The T701 includes a dewpoint sensor, an oil and diaphragm-free pump, and scrubbers to remove SO2, NO, NO2, O3, H2S, and NH3.  Optional high performance scrubbers are available to remove CO and Hydrocarbons.

The regenerative, heatless dryer removes water and produces output with a dewpoint of less than -20°C (up to 15 SLPM flow rate).  The system's pressure, temperature, and dew point values are all continuously monitored, which allows a microcontroller to adjust the pump cycling frequency, valve timing, and heater power for optimal performance. ​