Sensors and Systems for combustion technology

Lambda Transmitter LT3

Lambda Transmitter LT3
  • Combined Oand CO/Hmeasuring
  • Measuring directly inside flue gas
  • Applicable up to 1200 °C
  • Independent of infiltrated air (COe)
  • Ex design


Sheet steel

Protection type following  DIN 40050

IP66, without display
IP54, with embedded start-up assistant inside front door

Dimensions (HxBxT) mm

300 x 300 x 120


Grey, RAL 7035


appr. 6kg

Ambient temperature

-5 °C ... + 60 °C

Ambient temperature
transport and storage:

-20 °C ... + 70 °C

Power supply:

120 VAC / -30%...230 VAC / +10%, 50...60Hz

Power consumption:

30W (normal operation)
69W (heating)

Resolution O2:

0,1 Vol. % O2  in the range of 0...18 Vol. % O2
1 Vol. % O2  in the range of 18...25 Vol. % O2

Resolution COe:

1ppm in CO-range of 0…1000ppm

Preciseness of measuring:
(with combination probe KS1D)

O2:   ±5% of measurement value 
(max ± 0,3 Vol. % O2)

COe:  ±25% of measurement value
(not better than +/- 20 ppm after prior calibration for application conditions with a CO-reference measuring)

Setting time (60 % time):

O2:   T 60 < 10 s
COe: T 60 < 2 s

Time for readiness
with KS1D (cold start-up)

appr. 10min after „POWER ON“
(Initial start-up appr. 60min)

Analogue output, via analogue output module:

Analogue output  1 (O2 measurement value)
- Range of setting:   0…25 % O2
- Factory setting 0…10 Vol.% O2 -> 4…20 mA

Analogue output 2 (CO-measurement value)
-  Range of setting: 0…1000 ppm
- Factory setting 0…1000 ppm -> 4…20 mA

Digital outputs
via digital output module:


Control element:

Integrated LT3 User Interface with LCD-graphic display 45x27 mm (BxH)

External start-up assistant with LCD-graphic display 60x32 mm (BxH) (Option)


LAMTEC System Bus (LSB)

The Lambda transmitter LT3 in connection with the combination probe KS1D is developed for simultaneous measurement of O2 concentration and oxidizing gas elements (CO/H2), displayed as COequivalent (basically in exhaust gases of combustion plants within hyperstoichiometric ranges (λ > 1).

The display and handling of the LT3 is managed via user interface inside the front door (belongs to standard delivery), with the following functions:

  • Display of O2 and CO measurement values
  • Password entry
  • Informationen about probe and fuel, for warnings and failures, for software versions, CRC and serial number
  • Calibration of measurement
  • Setup (maintenance, filter time, analogue output, probe exchange, display)

Housings and types

Display and operation


Wall mounting housing

Optional user interface inside front-door

Probe installation fitting (PIF)

Start-up assistent in german / english or french language

Gas extraction device (GED)

LSB Remote software for PC

Outside-isolation / Flange blankets