The new compact class – sturdy and smart
A flue gas analyzer that offers all measurement and tuning functions. A small and lightweight flue gas
analyzer enclosed in an eye-catching, sturdy housing. The Wohler A 450 is a handheld device with user
friendly touchscreen control, displays all measurement data on screen or connect and view on your
smart devices.

ADVANTAGES
··Switch on – read off – done
··Rugged and compact analyzer that offers all measurement and tuning functions
··High-resolution 5” color touchscreen: 14 measured values available at a glance
··State of the art technology with network connectivity via wireless LAN
··Free Wohler A 450 App available on the App Store or Google Play

Application
· Residential flue gas analysis
· Service and maintenance tasks
· Determine flue gas loss and burner tuning
· Immission control measurements (1st BImSchV)
· NO measurement (optional)
· Differential pressure / gas pressure measurement
Functionality
· Simple to use
· Large 5" color touchscreen: Displays up to 14 measurement
readings
· Intuitive to operate via on-screen keyboard
· Graphic hotspot search
Safety / Reliability
· 48 month warranty1)
· Effective condensate protection
· Multistage filter technology incl. water stop filter
· Electronic filter monitor with illuminated condensate trap
· Analyzer and sensor diagnostics
· Field replaceable sensors – user-friendly
· Rechargeable battery operating time: more than 6 h with
lithium ion power
· Hose assembly – robust and flexible
Data management
· Store up to 1,000 customer records
· Data transmission by USB, Wireless LAN or infrared
· Wohler A 450 app included

TECHNICAL DATA
Oxygen concentration (O2) in flue gas
Display ....................................Volume % referenced to dry flue gas
Measurement principle .............Electrochemical sensor
Range .....................................0.0-21.0 vol. %
Accuracy .................................± 0.3 Vol.-%
Carbon monoxide (COV 10,000 ppm) in flue gas
Display ....................................Volume ppm referenced to dry flue gas
Measurement principle .............Electrochemical sensor, not H2 compensated
Range .....................................0-10,000 vol. ppm; resolution 1 vol. ppm
Accuracy .................................±20 ppm (< 400 ppm), otherwise 10% of reading
(if H2 < 5% of reading)
Nitric oxide concentration (NOV) in flue gas (optional)
Display ....................................Volume ppm referenced to dry flue gas
Measurement principle .............Electrochemical Sensor
Range .....................................0-3,000 vol. ppm, resolution 1 vol. ppm
Accuracy .................................± 5 Vol.-ppm (< 100 ppm), otherwise 5 % of reading
Chimney draught / differential pressure (PD) (article 4520/4502)
Display ....................................Pascal
Measurement principle .............Semi-conductor diaphragm
Range .....................................0.00 to ± 110.00 hPa; resolution 1 Pa
Accuracy .................................2 Pa (< 40 Pa), otherwise 5% of reading
Flue gas temperature (TS)
Display ....................................°F
Measurement principle .............Thermocouple (NiCr-Ni)
Range .....................................68-1472 °F
Accuracy .................................0-271.4 °F
271.4-1472 °F: ± 1.5 % of reading
Combustion air temperature (TA)
Display ....................................Fahrenheit
Measurement principle .............Thermocouple (NiCr-Ni)
Range .....................................68-212 °F
Fahrenheit ...............................± 1°F
Power supply
Wohler A 450 L ........................Lithium-Ion, rechargeable battery 3.7 V, 2,250 mAh,
charges via USB
Battery operating time
Wohler A 450 L ........................approx. 6 h (depends on operating status and display
illumination)
Charging time
Wohler A 450 L ........................approx. 3 h
Storage temperature ............-4-122 °F
Operating temperature .........41-104 °F
Weight ...................................1.5 lbs.
Dimension .............................6x4x1.5 inches
Length of the probe hose .....5 ft.