AMS 3211-860/150 Ex

The in line flue gas probe AMS 3211-860/150 is designed for applications in Ex Zone 1 according to ATEX II 2G Ex d IIB + H2 T3. The flue gas probe is equipped with an ATEX certified temperature control device, which switches off the heater of the ZrO2 sensor when the flue gas temperature exceeds 500 °C. The temperature control device is SIL 2 certified. AMS also manufactures Ex-certified flue gas probes for extreme applications and for flue gas temperatures up to 1200 °C.

All AMS flue gas probes can be fitted with a time controlled back-purge unit for applications with high dust content. Time controlled by the AMS transmitter instrument air with a pressure of up to 6 bar (g) is forced against the sinter metal filter from inside to blow off dust which has accumulated on the outer surface. Dust accumulation on the sinter metal filter surface which interferes with the diffusion of the measuring gas to the ZrO2 sensor can be avoided. The back-purge unit can be integrated into the pneumatic unit.

AMS 3211-860/150 Ex

Additional product features:

  • Immersion depth up to 860 mm
  • 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 3211-860/150
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,
designed as a flame arrestor
Flue gas temp., max. 500 °C
Dust content (flue gas) max. 5 grams/Nm3, if higher shield to protect against abrasion
or separate protecting tube
Flue gas velocity max. 20 m/Sec. or separate protecting tube
Time for pre-heating ~ 10 Minutes
T90 time < 10 Seconds
Reaction time < 2 Seconds
Probe length 150 – 860 mm
Connecting flanges DN 80 PN 40 (larger on request)
Material Stainless steel 1.4571
Installation in the stack pointing downward
Protection IP65
Reference air supply by separate pneumatic unit
Calibration gas supply by separate pneumatic unit
Ex classification II 2G Ex d IIB + H2 T3
Weight ca. 10,5 kg
Accessoires  
Transmitter AMS 5200 and AMS 3220 in housing IP 65
Pneumatic unit GRP housing, dimensions: 500 x 500 x 300 mm
Version: AMS 3211-860/150 E V01-2010-12