AMS 3211-500

The standard in-line probe AMS 3211-500 with the transmitter AMS 3220 is TÜV-approved according to European and German environmental regulations. The probe is equipped with a ZrO2 sensor, located in the tip of the probe. The probe can be used in applications with solid, liquid and gaseous fuels.

In applications with solid fuels and biomass the probe AMS 3211-500 is equipped additionally with a protective tube to avoid abrasion. For applications in corrosive gases all gas wetted parts are made of INCONEL 600. The standard in-line probe AMS 3211-500 is designed for flue gas temperature up to 500 °C.


AMS 3211-500

Additional product features:

  • immersion depth of 150 mm to 3000 mm
  • probe tubes made of ceramic or Kanthal, depending on process temperature
  • longer life expectancy of the ZrO2 sensor due to the reduced thermal load
  • fast and easy sensor replacement
  • flanges are available in DIN or ANSI sizes
  • continuous monitoring of sensor signal, heater and measuring value on plausibility by the transmitters AMS 3220 or AMS 5200
  • back-purge and auto-calibration features are available as options

Technical data

ZrO2 probe AMS 3211-500
Measuring principle ZrO2 probe with Pt-electrodes
Application Residual oxygen in flue gas
Construction ZrO2 sensor installed in the tip of the probe
with stainless steel sinter metal filter screwed on
Flue gas temp., max. < 500 °C, shorttime to 550 °C
Dust content (flue gas) up to 5 grams/Nm3, if higher shield to protect against abrasion
or separate protecting tube/blow back
Flue gas velocity max. 20 m/Sec., if higher shield to protect against abrasion
or separate protecting tube
Time for pre-heating ~ 10 Minutes
T90-Time < 10 Seconds
Reaction time < 2 Seconds
Probe length 150 – 3000 mm
Connecting flanges DN 65 PN 16, DN 80 PN 16 (larger on request)
Material Stainless steel 1.4541, Inconel 600
Installation in the stack pointing downward
Protection IP 65
Reference air supply by separate pneumatic unit
Calibration gas supply by separate pneumatic unit
Weight ca. 6,5 kg
Transmitter AMS 5200 / AMS 3220 in housing IP 65
Pneumatic unit GRP housing, Dimensions: 600 x 600 x 200 mm / 800 x 600 x 300 mm,
back-purge, auto-calibration
Version: AMS 3211-500 V-2013-07