Technical data Display variables [units]

Measuring range/resolution

Accuracy/response time 1)

Oxygen, via internal electro-chemical sensor (not 327 CO):

O2 content [%], O2air supply [%], Reference value O2 ref [%] 0...21% / 0.1%

±0.2% / t90 <40s

Carbon monoxide, 327-1:

CO content [ppm, mg/m³] (H2 share <10%)

0...4,000ppm / 1ppm

±20ppm (0...400ppm), ±5% of reading (401...1,000ppm), ±10% of reading (1,001...4,000ppm) / t90 <60s

Carbon monoxide, via internal electro-chemical sensor (only 327-2 with option COH2):

CO content [ppm, mg/m³]

0...8,000ppm / 1ppm

±20ppm (0...200ppm), ±5% v. Mw. (201...2,000ppm), ±10% of reading (2001...8,000ppm) / t90 <40s

Ambient Carbon monoxide, via internal electro-chemical sensor:

Ambient CO content amCO [ppm]

0...2,000ppm / 1ppm

±10ppm (0...100ppm), ±10% of reading (>100ppm) / t90 <40s

Temperature, via type K thermocouple of flue gas probe (NiCr-Ni):

Flue gas temperature FT, Flue gas dew point ATP, Ambient air AT

-40...+600°C / 0.1°C, -40...1,112°F / 0.1°F

±0.5°C (-40...100°C), ±0.5% of reading (>100°C), ±0.9°F (-40...212°F), ±0.5% of reading (>212°F) / t98 <50s (TE 0.5mm);<100s (TE 1mm)

Temperature, via differential temperature set 0554 1208:

Flue gas socket T1 [°C, °F], Sensor socket T2 [°C, °F]

-40...+600°C / 0.1°C, -40...1,112°F / 0.1°F

±0.5°C (-40...100°C), ±0.5% of reading (>100°C), ±0.9°F (-40...212°F), ±0.5% of reading (>212°F) / t98 <50s (TE 0.5mm);<100s (TE 1mm)

Pressure, via internal differential pressure sensor:

Flue draught Drght [mbar, hPa, inW, in Hg]

-40...40hPa / 0.01hPa

±0.02hPa (-0.50...0.60hPa), ±0.03hPa (0.61...3hPa), ±1.5% of reading (>3hPa) /-

Flue draught Drght, with option of precision draught [Pa] -100...100Pa / 0.1Pa

±3Pa / -

Pressure and tightness test via internal differential pressure sensor, with differential pressure set 0554 1203:

Differential pressure Δp [hPa] -200...200hPa / 0.1hPa (with option precision difference pressure: 0.01hPa)

±0.5hPa (0.0...50.0hPa) ±1% of reading (50.1...100.0hPa) ±1.5% of reading (100.1...200.0hPa)

Efficiency, calculated:

Efficiency η2 [%], Efficiency η+3) [%]

0...120% / 0.1%

±0.2% / -