The Team




Our Goal

Heating is colloquially considered a luxury, and more in a country like Mexico, where the heat is taken as a daily. But when it comes to specialized industrial processes or performance and production in greenhouses, heating is not a luxury, it is an absolute necessity.

And as part of an industrial process, not a question that can be left to chance, is a matter of vital importance that may mean increasing the profit margin of a company, or total loss of investment in it.

Understanding this fundamental need, in Van Triest Engineering Group works to give the customer not only products of the best brands with proven quality, but also the necessary technical support for users who decide not see your confidence in your investment risk.

The mission of Van Triest Engineering is to provide the best product, best support and better care.

The combination-probe KS1D is qualified for measuring at places or spots, which are marked by infiltrated air, as well as in multi-burner applications, for which a sole O2 measuring cannot give any statements for atmosphere or combustion process respectively a fast response is needed. It is used in applications controlling oven atmosphere at measureing gas temperatures up to 1400 °C.

It is applied to gas combustions of all types, wood- and carbon-dust combustions as well as garbage combustion plants, glow- and melting ovens and crematoriums.

Technical Data

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

0,01...21 Vol.% O2: 800...-30mV (O2-electrode) <-> 0...21Vol.% O2

0...10.000 ppm: -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 MOhm

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