​Model T753U

with NumaView™ Software

​Portable Trace-Level O3 Calibrator​



  • Transfer standard for calibration of ozone analyzers
  • Stable and accurate ozone output to 2 ppb
  • Built-in ozone generator and photometer
  • Large, vivid, and durable color touchscreen display
  • Ethernet, RS-232, and (optional) USB com ports
  • Front panel USB ports for peripheral devices and firmware upgrades
  • 12 independent timers for sequences
  • Nested sequences (up to 5 levels)
  • Flow adjustable from 2 to 5 LPM (with internal zero air source)
  • Flow adjustable from 2 to 15 LPM (with external zero air source)    
  • Inlets for external ozone reference sources
  • Internal Zero Air Source Module (optional)
  • Two-year warranty​


085930000C - MANUAL, USER, T753U.pdfT753U Manual9197 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
SAL000095C - T753U.pdfT753U Specification973 KB
SAL000095D-CN T753U.pdfT753U规格 (Chinese Specification)771 KB
T SERIES_6PG.BROCHURE_2018_web.pdfT Series with NumaView™ Software Brochure9567 KB


​​Flow Rate (with internal zero air source)
​2 to 5 LPM adjustable
​​ Flow Rate (with external zero air source)
​​2 to 15 LPM adjustable
± 1% of full scale
1.0 ppb​
 Response Time  
< 240 seconds to 95%
 Span Drift (7 days)
< 1% with photometer feedback
< 3% without photometer feedback (CNST)
​​Ozone Generator Module
 Maximum Ozone Concentration
1250 ppb at 2 LPM
 Minimum Ozone Concentration
2 ppb at 5 LPM
 Response Time
< 180 seconds to 98%
​​UV Photometer
0 - 100 ppb to 0 - 10 ppm
 Rise/Fall Time
< 20 seconds to 95% (photometer response)
 Zero Drift
< 0.5 ppb/24 hours
 Flow Rate
800 cc/min ±10%
Electrical Specifications
 Power Requirements
100V-120V, 220V-240V, 50/60 Hz
 Analog Output Ranges (Test Channel)
10V, 5V, 1V, 0.1V (selectable)
​Communications Specifications
 Included I/O
1 x Ethernet: 10/100 Base-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 - 40°C
Dimensions (HxWxD) 9” x 17” x 21” (229 x 432 x 533 mm)

41.5 lbs (18.8 kg) with internal zero air option
38.5 lbs (17.5 kg) without internal zero air option
Specifications are subject to change without notice.
All specifications are based on constant conditions.​


The Model T753U is a portable, microprocessor based precision Calibrator for Ozone gas instruments and sensors. Using a sophisticated Ozone generation system, combined with a sensitive photometer and pneumatic design, the T753U produces stable and reliable concentrations of Ozone in a convenient and rugged package based on our popular T750U Portable Multigas Calibrator platform. The T753U 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 for virtually any application. An internal zero air option extends the T753U's capabilities to also provide a clean and dry source of zero air, eliminating the need for a separate source of zero air. The internal zero air source module contains a software driven electronic inlet valve manifold allowing the calibrator to automatically switch between internal and external zero air sources depending on the application needs.​

The T753U operates in two modes; a high range, and a low range, or "fractional" mode, for producing accurate Ozone levels down to 2 ppb which meets the latest US EPA calibration requirements for Trace-level Ozone gas instruments. The mode is automatically selected based on the Ozone concentration range chosen by the user. To ensure high accuracy and stability of the Ozone output, the calibrator constantly measures the Ozone concentration being produced with an internal photometer and uses it to actively control the Ozone generator in real-time. The internal photometer can be certified by another external Reference Standard by simply using the 'photometer input loop' located beneath the fold up panel. The T753U Portable Ozone Calibrator combines performance and convenience for the most demanding applications.

The T753U Portable Ozone Calibrator's performance is characterized by our own Model T265 Chemiluminescence O3 Analyzer; a US EPA Federal Reference Method (FRM) for Ozone. With an interference-free Ozone measurement and best available lower detection limit (LDL) of < 0.3 ppb, the T753U performance is proven by the most sensitive Ozone gas analyzer technology available.

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 T753U 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.​