​Model T701H

High Performance Zero Air System​



  • Modbus Connectivity
  • Trace Level output purity
  • Dewpoint Sensor
  • Once/year maintenance interval
  • Regenerative, heatless dryer for maintenance-free water removal
  • Long-life scrubbers for SO2, NO, NO2, O3, H2S and NH3
  • High performance CO/Hydrocarbon scrubber
  • Automatic water drain
  • Automatic pump control with demand tank
  • Two-year warranty


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
SAL000084C - T701H.pdfT701H Specification493 KB
SAL000084C-CN T701H.pdfT701H规格 (Chinese Specification)695 KB
SAL000084D-CN T701H.pdfT701H规格 (Chinese Specification)878 KB


Output 30 SLPM at 30 psig
Max Delivery Pressure 35 psig
Dewpoint <-40ºC
Dryer Regenerative heatless dryer with lifetime of greater than 5 years
Output Concentration SO2 < 0.025 ppb
H2S < 0.025 ppb
NO < 0.025 ppb
NO2 < 0.025 ppb
NH3 < 0.025 ppb
O3 < 0.3 ppb
CO < 10 ppb  
HC < 0.25 ppb
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 71.12cm)
Weight 69 lbs (31.3 kg) 
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 T701H adds Modbus TCP/IP connectivity to the proven reliability and performance of our high purity zero air system. 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 T701H is a fully self-contained source of high purity zero air for dilution calibrators.  It is ideal for use with highly sensitive analyzers in ambient background and trace level applications.  The T701H includes a dewpoint sensor, an oil and diaphragm-free pump, scrubbers to remove SO2, NO, NO2, O3, H2S and NH3, plus high performance scrubbers to remove CO and Hydrocarbons.

The regenerative, heatless dryer removes water and produces output with a dew point less than -40ºC (up to 30 SLPM flow rate).  The system's pressure, temperature, and dewpoint values are all continuously monitored, which allows a microcontroller to adjust the pump cycling frequency, valve timing, and heater power for optimal performance.