​Model T750U
with NumaView™ Software

​Trace Level Portable Gas Calibrator




  • Stable and accurate ozone output to 3 ppb
  • Stable and accurate Gas Phase Titration (GPT) to 3 ppb NO2
  • Built-in photometer, ozone generator, and GPT chamber
  • Large, vivid, and durable color graphics display with touch screen interface
  • Ethernet, RS-232, and (optional) USB com ports
  • Front panel USB ports for peripheral devices and firmware upgrades
  • Nested sequences (up to 5 levels)
  • Software linearization of mass flow controllers (MFC)
  • 3rd MFC for wide dynamic range (optional)
  • Glass GPT chamber
  • Inlet for external ozone reference sources
  • Two year warranty


083730750C - MANUAL, NVS, USER, T750 T750U.pdfT750/T750U with NumaView™ Software Manual10632 KB
22-002A REST API Tutorial For Numaview Instruments - GCAL-O3.pdfREST API Tutorial for NumaView Instruments584 KB
ESD Fundamentals - 04786.pdfFundamentals of Electro-Static Discharge (ESD)216 KB
NVS Remote Manual - 08492.pdfNumaView™ Software Remote User Guide867 KB
SAL000076K - Environmental Instruments Overview.pdfEnvironmental Instruments Overview610 KB
SAL000086G - T750U.pdfT750U Specification1055 KB
SAL000086H-CN T750U.pdfT750U规格 (Chinese Specification)990 KB
T SERIES_6PG.BROCHURE_2018_web.pdfT Series with NumaView™ Software Brochure9567 KB


​​Dilution System
Flow Measurement Accuracy ± 1% of full scale

Repeatability of Flow Control ± 0.2% of full scale
Linearity of Flow Measurements ± 0.5% of full scale
Flow Range of Dilution Air 0 - 10 SLPM
Optional Ranges 0 - 5 SLPM, 0 - 20 SLPM (others available)
Flow Range of Cylinder Gases* 0 - 200 cc/min
Optional Ranges 0 - 50 cc/min, 0 - 100 cc/min (others available)
Zero Air Requirements 10 SLPM @ 30 psi
Optional Ranges 20 SLPM @ 30 psi
Input Pressure 20 - 40 psig
Calibration Gas Input Port 1 (configurable)
Diluent Gas Input Port 1
​​NO2 Generation (GPT Modes)
Minimum Output 20 ppb LPM
Minimum Concentration 3 ppb
Precision ±2% (with GPTPS)
​​Ozone Generator Module
Maximum Output 4.5 ppm LPM
Minimum Output 20 ppb LPM
Minimum Ozone Concentration 3 ppb
Response Time 180 seconds to 98%
​UV Photometer Option

0 - 100 ppb to 0 - 10 ppm (selectable)
Precision 1.0 ppb
Linearity 1.0% of reading
Rise/Fall Time < 20 seconds (photometer response)
Response Time 180 seconds to 95% (system response)
Zero Drift < 1.0 ppb/24 hours
​​Electrical Specifications
Power Requirements 85V - 264V, 47Hz - 63Hz
Analog Output Ranges 10V, 5V, 1V, 0.1V (selectable)
​​Communications Specifications
Included I/O 1 x Ethernet: 10/100Base-T
2 x RS232 (300-115,200 baud)
2 x USB device ports
12 x digital control outputs
12 x digital control inputs
8 x digital status outputs
Optional I/O 1 x USB com port
1 x RS485
Multidrop RS232
​​Physical Specifications
Operating Temperature Range 5 - 40ºC
Dimensions (HxWxD) 9” x 17” x 21” (229 x 432 x 533 mm)
We​ight 46.6 lbs (21.14 kg)​​
* Can select 3rd MFC option for wider dynamic range​​​

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


The Model T750U is a portable, microprocessor based calibrator for precision trace-level gas analyzers.  Using highly accurate mass flow controllers combined with compressed sources of standard gases, calibration standards are provided for multipoint span and zero calibrations.  The T750U is housed in a high-density, molded travel case which includes an integral handle and wheels for durability and ease of use in the field.

The Model T750U is designed for the demanding requirements of trace-level measurements.  The ability to calibrate and verify linearity for NO2 levels below 5 ppb is difficult with standard calibrators.  To overcome this limitation, the Model T750U ozone generator operates in two modes; a high range with similar performance to the Model T750 ozone generator, and a low range, or "fractional" mode, for producing accurate ozone levels down to 3 ppb.  To ensure the highest accuracy of NO2 output, the calibrator measures the ozone concentration prior to performing a gas phase titration (GPT), and the range is selected automatically by the Model T750U based on ozone concentration and flow specified by the user.

All T Series instruments offer an advanced color display, capacitive touch screen, intuitive user interface, and flexible I/0.  All instrument set up, control and diagnostic information is available through the front panel, or via RS232, Ethernet, or the optional USB com port, either locally or by remote connection.

The Model T750U comes with NumaView™ Software.  NumaView™ Remote PC Software allows for a remote connection with virtual interface and data downloading capability to analyzers operating NumaView™ Software.