Combination Probe KS1D


Simultaneous measurement of the concentration of O2 
and oxidising gas constituents (CO/H2

  • Heated, electro-chemical measuring cell, made of zirconium dioxide ceramic (ZrO2)
  • Use of proven measuring principles
  • Simultaneous measuring of oxygen O2 and detection of oxidisable (combustible) parts of flue gas 
  • Display as COequivalent (COe)
  • Cost-efficient measuring for monitoring and optimisation of oil- and gas combustions

Range of measuring O2:

0…18%Vol. O2 – with limitations 0…21 Vol.% O2
COe: 0…1.000 ppm COe, 0…10.000 ppm COe on request

Preciseness of measuring:

O2: +-5% of measuring value – not better than +- 0,3 Vol.%
COe: +-25% of measuring value – not better than +- 10 ppm
after prior alignment of application conditions with a CO reference measuring in a range of measuring 0…100 ppm: <= 10 ppm

Response time t60:
(60% of final value)

O2 <= 10 seconds
COe <= 2 seconds

Failure impact:

Change of temperature of measuring gas in dependency of preciseness of temperature control of ZrO2 measuring cell


against SO2, NH3, NO, Propan, other arenes

Allowed fuels

Residue-free, gaseous hydrocarbons, light fuel oil and brown coal / black coal

constant exhaust gas temperature

<=  300°C (Article-No. 656R2000)
<=  450°C (Article-No. 656R2010 / 656R2012)

Operating temperature 
(KS1-D sensor)

Probe housing <= 400°C (measured at hexagonal)

Cable bushing <= 200°C

Connecting cable <= 150°C


>= 3 years at oil and domestic gas

Probe output voltage 

800…-30mV (O2-electrode) <-> 0…21 Vol. % O2

-30…800mV (CO/H2-electrode) <-> 0…10.000ppm COe

Probe internal resistance RI 
in air at 20 °C and 20  W Heat output (new probe) 

15…30 Ohm O2 – electrode 1
15…30 Ohm CO/H2 – electrode 2

Heat output at ambient temperature

18…25 W – depending on type

Isolation resistance between heating and probe connector

> 30 MΩ

Power supply

at connector (D/C- A/C voltage)

at PH 18 VA  → 11,4 V
at PH 20 VA  → 12,34 V
at PH 25 VA  → 14,8 V

Heat output for 
TGas = 350 °C

appr. 18 W

Heat current at
PH 20 VA

appr. 1,6 A
appr. 5A shortly at heating-up

Dimensions of probe
KS1D sensor
KS1D with housing

Length 115  mm; thread M18 x 1,5 mm
Length 185 mm; R 1 1/4“, D=31,75 mm