BIO, BIOA, ZIO

Burners for gas BIO, BIOA, ZIO 

Technical Information · GB 

7.2.14 Edition 12.08 

• Large capacity range up to 1000 kW 

• Maintenance-friendly thanks to modular design 

• Robust burner design 

• Direct or lance ignition 

• Ionisation control or optionally with UV sensor 

• Suitable for new systems and modernisation of existing systems thanks to 

individual length adjustment 

• Air preheating to 450°C available as an option 

• Low polluting level thanks to optimised combustion 

• For installation as ceiling or side-wall burner thanks to arbitrary installation 

position 

• Can be combined with different combustion chamber shapes 

www.kromschroeder.com

2 

Table of contents 

Burners for gas BIO, BIOA, ZIO ...................... 1 

Table of contents .................................2 

1 Application. ................................... 3 

1.1 Examples of application. .........................5 

1.1.1 Continuous control with pneumatic ratio control system ...5 

1.1.2 Continuous control with pneumatic ratio control system and 

lance ................................................5 

1.1.3 Continuous control with pneumatic ratio control system ...6 

1.1.4 Staged control with pneumatic ratio control system ......6 

2 Mechanical construction. .........................7 

2.1 Burner housing (furnace flange) ...................7 

2.2 Burner insert ..................................7 

2.3 Burner tube ...................................8 

3 Function. ......................................9 

4 Selection .....................................10 

4.1 Burner type. ..................................10 

4.2 Burner size. ..................................10 

4.3 Burner head. ..................................11 

4.4 Field of application ............................12 

4.5 Calculating the burner tube length ...............13 

4.5.1 Burners in burner quarls ...........................13 

4.5.2 Burners with burner attachment tube ................16 

4.6 Selection table ................................18 

4.6.1 Type code .......................................19 

5 Project planning information .................... 20 

5.1 Installation ...................................20 

5.2 Recommended ignition transformer ..............20 

5.3 Nozzle-mixing burners .........................20 

5.4 Flame control. ................................20 

5.5 Hot air compensation. .........................20 

5.6 Purging air/cooling air . . . . . . . . . . . . . . . . . . . . . . . . . 21 

5.7 Emissions ....................................21 

5.8 Gas line connection ...........................22 

5.9 Air line connection ............................22 

6 Technical data. ............................... 23 

6.1 Dimensions ..................................25 

6.2 Burner lance .................................27 

6.2.1 BIO .............................................27 

6.2.2 ZIO ............................................27 

7 Maintenance cycles ........................... 28 

Feedback ..................................... 29 

Contact. ...................................... 29 

BIO, BIOA, ZIO · Edition 12.08 

t = To be continued

3 

BIO 

1 Application 

For industrial furnaces and firing systems in the iron and steel 

industries in the precious, non-ferrous and light metal sector, 

as well as in the plastics, fibre and paper industries. Other 

fields of application are thermal incineration installations, as 

well as driers and hot-air generators. 

For low temperature applications (e.g. for crucible heating, 

radiant tube heating or hot-air generation), the burners are 

equipped with a heat-resistant steel attachment tube. 

For high temperature applications (e.g. forging furnace), the 

burners are used in combination with a burner quarl made 

from refractory concrete. Different flame shapes can be 

achieved by using burner quarls with a different geometry. 

The burner may be adapted to the system requirements using 

different burner tube lengths. 

BIOA 

ZIO 

BIO, BIOA, ZIO · Edition 12.08

Application 

4 

Shaft melting and holding furnace Bogie hearth forging furnace Incineration installation for thermal regenerative 

flue air purification 

Strip galvanising plant Rotary table furnace Aluminium tank furnace 


Application 

5 

1.1 Examples of application 

Threepoint 

step 

VAS 

M 

VAG 

GEH 

EKO 

LEH 

EKO 

ZIO, BIO, BIOA 

1.1.1 Continuous control with 

pneumatic ratio control system 

This type of control offers the benefit of 

the mixture setting being maintained 

over a wide control range while at the 

same time preventing air deficiency. 

This type of control is used in melting 

furnaces in the aluminium industry or in 

regenerative incineration installations in 

the environment industry, for example. 

IC 20 + BVA 

BVA 

AKT 

VAS 

VAG 

M 

VAS 

GEH 

GDJ 

VR 

EKO 

GEH 

LEH 

EKO 

BIO..L, ZIO..L 


pneumatic ratio control system and 

lance 

The burner’s flexibility is increased thanks 

to an ignition lance. The control range 

can be extended incrementally with an 

optional integrated lance. This type of 

control is used in heat treatment furnaces 

in the iron and non-ferrous metal 

industries and in heating furnaces in the 

steel industry, for example. 

IC 20..E + BVA 

BVA 


Application > Examples of application 

6 

DG..VC 

AKT GFK AKT 

DL..A 

+ FLS 

M 

VAS 

VAS 

VAG 

M 

IC 20 

+ LFC 

GEH 

EKO 

ZIO, BIO, BIOA 


pneumatic ratio control system 

The burner is designed for near-stoichiometrical 

operation and a control 

range of 1:10 with its special burner head 

construction for CO2-optimised combustion. 

In combination with the cascade 

control system, the burner is capable of 

operating even with very low connection 

ratings, control ranges of 1:45 can be 

achieved. 

DG..C 

IC 20 + BVA 

LEH 

EKO 

AKT 

VAG+VBY 

MB 7 + BVHM 

GEH 

EKO 

LEH 

EKO 

BIO, BIOA, ZIO 

1.1.4 Staged control with pneumatic 

ratio control system 

The high output pulse at the burner generated 

by this type of control produces 

a uniform temperature distribution and 

good circulation of the furnace or kiln 

atmosphere, e.g. in heat treatment furnaces 

in the iron and non-ferrous metal 

industries or kilns for heavy-clay and fine 

ceramics. The pneumatic air/gas ratio 

control system offers maximum safety by 

an air deficiency cut-out, with a constant 

lambda value being maintained while 

the air pressure varies. 


7 

2 Mechanical construction 

The BIO, BIOA and ZIO burners are composed of three modules: 

burner housing, burner insert and burner tube. This structure 

allows the burners to be easily adapted to the respective process 

or to be integrated into existing systems. Maintenance and 

repair times are reduced and existing furnace installations 

can be easily converted. 

2.1 Burner housing (furnace flange) 

BIO BIOA ZIO 

The burner is secured to the furnace by the burner housing. 

The burner housing accommodates the burner insert and 

the burner tube, and routes the combustion air. The combustion 

air pressure can be measured using an air pressure test 

nipple. 

2.2 Burner insert 

BIO, BIOA 


The combustion gas is supplied to the burner head via the 

gas connection and the gas pipe. The gas connection flange 

comprises of the gauge glass, ground screw and electrode 

plugs with plug caps. 

As of construction stage E, the connection flange is equipped 

with an integrated measuring orifice and flow adjustment for 

easy measuring and exact adjusting of the gas flow rate. 

The ignition and ionisation electrodes are screwed into the 

connection flange and can be replaced without removing the 

burner insert as of burner size 65 and construction stage D. 

Burners BIO, BIOA and ZIO are nozzle-mixing burners. Gas 

and air are mixed only once they are in the burner head. This 

prevents explosive gases from being generated in the pipeline. 

There are various burner head versions for different flame 

shapes and gas types. 


Mechanical construction 

8 

2.3 Burner tube 

Different overall lengths enable adjustment to the system 

requirements. 

In the burner quarl 

The burner head is positioned inside the burner tube. The 

burner quarl accommodates the burner tube and simultaneously 

acts as the combustion chamber for the complete 

combustion of the flame. 

With attachment tube 

The burner head is positioned inside the burner tube. An attachment 

tube made of heat-resistant steel acts as the combustion 

chamber for the complete combustion of the flame 

for low- and medium-temperature applications. 


9 

3 Function 

The burner control unit opens the gas and air control valves. 

Gas flows through the gas connection flange and air flows 

through the burner housing as far as the nozzle-mixing burner 

head. 

The combustible gas/air mixture is produced downstream of 

the burner head. Slots and holes in the air disc vary the degree 

and manner of twisting of the combustion air and determine 

the flame geometry. Depending on the gas type, the geometry 

of the gas nozzle varies. 

The gas/air mixture is electrically ignited directly by an ignition 

electrode or an ignition lance. A flame forms which is 

monitored using an ionisation electrode or optionally using 

the UV sensor. 

The choice of the respective combustion chamber material 

and geometry is primarily determined by the process. 

Using burner quarls, almost any flame shape and outlet velocity 

can be achieved. 

For low-temperature applications, a combustion chamber 

made of heat-resistant steel is used. The combustion chamber 

is part of the metallic burner attachment tube. 

BIO, BIOA 


Burner insert 

Gas 

Burner housing 

Burner insert 

Gas 

Air 

Burner housing 

Air 

Burner head 

Burner tube 

Burner head 

Burner tube 

Burner head 

Ignition electrode 

Ionisation electrode 

Gas nozzle 


10 

4 Selection 

4.1 Burner type 

Type 

Housing 

Air temperature Furnace temperature 

°C °C 

BIO GG 25 20 to 450 50 to 1600 

BIOA AlSi 20 to 200 50 to 1400 

ZIO ST 20 to 450 50 to 1600 

4.2 Burner size 

Burner size 

Burner capacity 

[kW] 

BIO 50 40 

BIO, BIOA 65 90 





ZIO 165 630 

ZIO 200 1000 


Selection 

11 

4.3 Burner head 

The choice of burner head depends on the flame shape, gas type and variant. 

Flame shape 

Control range 

Code letter 

Furnace 

Air 

burnerhead Continuous 

volume 

Constant air 

Low fi re λ λ 2) temperature temperature 3) 

Staged 

[°C] 

[°C] 

normal R 1:10 1:3 > 1:10 > 1.05 0.8 – 1.3 50 – 1350 20 – 150 5) 

long H 1:10 1:4 1:10 > 1.3 0.8 – 1.5 500 – 1600 20 – 450 

fl at K 4) – – > 1:10 > 1.05 0.9 – 1.2 50 – 1100 5) 20 – 150 5) 

1) Standard version, for larger control ranges, see under Variant. 

2) Indicate the rough range for the max. connection rating. For precise values for the individual versions, see burner diagrams. The ranges were determined 

for an ionisation current ≥ 5 μA. Extension of the working range using a UV sensor. 

3) The gas fl ow rate should be reduced in accordance with the enthalpy gain of the preheated combustion air. 

4) In conjunction with a burner quarl, for use as a radiant burner. 

5) Higher temperatures available on request. 

Gas type 

Code letter 

Calorifi c value range 

kWh/m 3 (n) 

Densitiy ρ 

kg/m 3 

Natural gas L and H quality B 8 to12 0.7 to 0.9 

Propane, propane/butane, butane M 25 to 35 2.0 to 2.1 

Propane, propane/butane, butane G 1) 25 to 35 2.0 to 2.1 

Town gas, coke oven gas D 4 to 5 0.4 to 0.6 

Low calorifi c value gas L 2) 1.7 3) to 2.5 0.9 to 1.15 

1) For BIO 50. 

2) Not for all burner sizes. Burner capacity is limited to 50% of the rated capacity. 

3) Calorifi c value range < 1.7 on request. 

Variant Code letter Low fi re 

Output 

[kW] 

λ 

Separate low-fi re gas and air rate supply L approx. 1.5 > 1.05 

Reduced max. connection rating R – > 1.05 


Selection 

12 

4.4 Field of application 

Field of application Illustration* 

Combustion 

chamber 

Industrial furnaces, open 

combustion chambers 4) A Open cone 


combustion chambers 4) B Cylindrical 


combustion chambers 4) C Tapered 


combustion chambers 4) D Flat fl ame quarl 

Crucible heating E Cylindrical 

Radiant tube heating 

1), 2), 3) F 

Hot-air generation 

1), 3) G 

Burner attachment 

tube with 

purging air bore 

holes 

Burner attachment 

tube with 

purging air bore 

holes, protective 

fl ame tube FPT 

Control 

High/Low 

Continuous 

High/Low 

High/Low/Off 

Continuous 

High/Low 

High/Low/Off 

Continuous 

High/Low 

High/Low/Off 

Continuous 

High/Low 

High/Low/Off 

Continuous 

Burner 

head type 

Max. 

capacity 

R 100 % 

Note 

Recommended for cold-air operating mode only, 

otherwise the nitric oxide values are too high 

R, H 100 % Normal to medium fl ow velocity 

R, H ca. 80 % 

K 100 % 

H 100 % 

On/High/Off H 100 % 

High/Low 

High/Low/Off 

Continuous 

R 100 % 

Medium to high velocity, capacity depending 

on the diameter 

In the case of continuous control, usage in 

the lower capacity range (≥ 40%) is restricted, 

depending on the burner 

The connection rating of the burners is 

chiefl y dependent on the capacity of the 

burner chamber. 

The connection rating of the burners is 

chiefl y dependent on the capacity of the 

burner chamber, usually < 2.5 W/cm². A 

draught blocker must be fi tted on the fl ue 

gas side. 

Protection of the fl ame from cooling is ensured 

by using a protective fl ame tube FPT 

(recommended for fl ow velocity of 

> 15 m/s) 

* See burner with attachment tube or burner quarl type. 

1) When using the burners in radiant tubes or in small combustion chambers, a trial under operating conditions is recommended. The burners must be 

secured gas-tight to the furnace or burner quarl by the furnace fl ange, so that a backfl ow of hot fl ue gases is avoided. 

2) The outlet diameter of the radiant tube must be reduced to the point where a pressure loss of approx. 10 mbar occurs at max. burner capacity. 

3) Only where the furnace temperature is < 600°C. 

4) For optimal operation, the burner quarl and the fl ame shapes are combined according to the fi eld of application (see Burners in burner quarls). 


Selection 

13 

4.5 Calculating the burner tube length 

4.5.1 Burners in burner quarls 

BIO, BIOA, ZIO Burner quarl type Gas type* 

Flame shape 

Burner head** 

Burner 

chamber 

length BKL 

(L 10 ) 

[mm] 

50 A B, G, D R 215 to 265 

50 B, C B, G, D R 115 to 265 

50 B, C B, G H 115 to 265 

50 D B K 130 to 135 

65 A B, M, G, D R 215 to 265 

65 B, C B, M, G, D R 115 to 265 

65 B, C B, M, G, D H 115 to 265 

65 D B, M, D K 155 to 175 

80 A B, M R 215 to 265 

80 B, C B, M R 165 to 265 

80 B, C B, M H 165 to 265 

80 D B, M K 205 to 225 

100 A B, G, M, D R 215 to 315 

100 B, C B, G, M, D R 165 to 265 

100 B, C B, G, M, D H 165 to 315 

100 D B, M K 230 to 250 

100 D D K 170 to 190 

125 A B, M, G R 265 to 365 

125 B, C B, M, G R 215 to 315 

125 B, C B, M H 215 to 365 

125 D B K 190 to 210 

* B = natural gas, M = butane, butane/propane, propane, D = town gas, 

G = propane, propane/butane 

** Flame shape: R = normal, H = long, K = fl at 

Burner quarl type 

BKL 

BKL 

BKL 

BKL 

∅ 

A 

B 

C 

D 


14 

BIO, BIOA, ZIO Burner quarl type Gas type* 

Flame shape 

Burner head** 

Burner 

chamber 

length BKL 

(L 10 ) 

[mm] 

140 A B, M, D R 315 to 415 

140 B, C B, M, D R 265 to 365 

140 B, C B, M, G, D H 265 to 415 

140 D B, M K 215 to 235 

165 A B, M R 315 to 465 

165 B B, M R 265 to 415 

165 B, C B, M, D H 265 to 465 

165 D B, M K 240 to 260 

200 A B, M R 415 to 565 

200 B B, M R 315 to 465 

200 B, C B, M, D H 315 to 565 

200 D B K 255 to 275 

* B = natural gas, M = butane, butane/propane, propane, D = town gas, 

G = propane, propane/butane 

** Flame shape: R = normal, H = long, K = fl at 

For further information on burner quarls – see www.docuthek.com 

BKL 

BKL 

BKL 

BKL 

∅ 

A 

B 

C 

D 


Selection > Calculating the burner tube length > Burners in burner quarls 

15 

L1 

L2 

L O 

max. 10° 

BKL 

Legend 

L1 = Burner tube length 

L2 = Position of burner head 

L O = Furnace wall thickness 

BKL = Burner chamber length (L10) 

The position of the burner head (L2) should be appropriately selected, so that the 

burner head extends into the burner quarl. 

The position of the burner head is available in the following lengths: 35, 135, 235, 

335 mm, etc. 

Determine the position of the burner head: L2 = L O - BKL 

The burner tube length (L1) is predefined, depending on the flame shape R, K or H: 

R, K burner head: L1 = L2 + 15 mm 

H burner head: L1 = L2 + 65 mm 

Example 

Desired flame shape = R (normal). 

Selected burner with 40 kW capacity = BIO 50, 

the related burner chamber length (BKL) = 115 to 265 mm. 

Furnace wall thickness L O = 340 mm. 

Determine the position of the burner head: 

L2 = L O - BKL = 340 mm - 115 mm = 225 mm. 

Take the next smallest position of the burner head (L2): 

calculated position of the burner head = 225 mm ➔ next smallest position of the 

burner head = 135 mm. 

Test whether the burner chamber length (BKL) fits: 

furnace wall thickness – next smallest position of the burner head = burner 

chamber length 

L O - L2 = BKL ➔ 340 mm - 135 mm = 205 mm. 

The required BKL for burners BIO 50 with a furnace wall thickness of 340 mm 

and a burner head position of 135 mm is 205 mm. 205 mm falls into the burner 

chamber length range for burners BIO 50: 115 to 265 mm (see table Burners in 

burner quarls). 


Selection > Calculating the burner tube length 

16 

4.5.2 Burners with burner attachment tube 

Examples for fields of application 

E F G 

Crucible heating Radiant tube heating Hot-air generation 


Selection > Calculating the burner tube length > Burners with burner attachment tube 

17 

L1 

L O 

L2 L 1-2 

Legend 

L1 = Burner tube length 

L2 = Position of burner head 

LO = Furnace wall thickness 

L 1-2 = Distance from burner head to 

burner tube end 

Distance from burner head to burner tube end (L 1-2 ): 

BIO, BIOA, ZIO 

H burner head 

R burner head 

[mm] 

[mm] 

50 115 115 

65 115 115 

80 165 165 

100 165 165 

125 215 215 

140 265 265 

165 265 165 

200 315 215 

Position of burner head: 

L2 = L O ± 50 mm 

The burner tube length (L1) is calculated by adding the position of the burner 

head (L2) to the distance from burner head to burner tube end (L 1-2 ): 

L1 = L2 + L 1-2 

Example 

Desired flame shape = R (normal). 

Selected burner with 40 kW capacity = BIO 50, 

the related distance from burner head to burner tube end (L 1-2 ) = 115 mm. 

Available furnace wall thickness L O = 250 mm. 

Determine the position of the burner head: 

L2 = L O - 50 mm = 250 - 50 mm = 200 mm. 

Take the next largest position of the burner head (L2): 

calculated position of the burner head = 200 mm ➔ next largest position of the 

burner head = 235 mm. 

Calculate the related burner tube length (L1): 

L1 = L2 + L 1-2 = 235 mm + 115 mm = 350 mm. 


Selection 

18 

4.6 Selection table 

50 65 80 100 125 140 165 200 H R K B G M L D L - 50 –… /35 – … -(1) – -(99) A – Z B 

BIO 

BIOA 

ZIO 

= standard, = available 

Order example 

ZIO 165RB-50/35-(17)D 


Selection > Selection table 

19 

4.6.1 Type code 

Code 

Description 


Burner for gas 


Burner for gas with aluminium housing 


Burner for gas 

50 to 200 Burner size 

Flame shape: 

H 

Long 

R 

Normal 

K 

Flat 

B 

G 

M 

L 

D 

Gas type: 

Natural gas 

Propane, propane/butane 

Butane, butane/propane 

Low calorifi c value gas 

Town gas 

Variant: 

Separate low-fi re gas and air rate supply 

Reduced max. connection rating 

L 

R 

–50* 

–100** 

–150* 

–200** 

Burner tube length [mm] 

–250* 

–300** 

to 

/35– 

/135– 

Position of burner head 

/235– 

to 

-(1) to -(99) Burner head identifi er 

A to F 

Construction stage 

B 

With purging air bore holes 

* R-, K burner head 

** H burner head 


20 

5 Project planning information 

5.1 Installation 

Installation position: any. 

Gas and air connection: can be rotated in 90° steps. 

Install and insulate the burner in order to avoid any overheating 

of the components during operation. Where applicable, 

purging air must be used to prevent ingress of aggressive 

gases and thermal overload of components. 

Purging air bore holes in the furnace flange area ensure cooling 

and stability in the case of combustion in small combustion 

chambers (for example radiant tubes). 

5.2 Recommended ignition transformer 

≥ 7.5 kV, ≥ 12 mA, e.g. TZI 7,5-12/100 or TGI 7,5-12/100. 

5.3 Nozzle-mixing burners 

Non-return gas valves are not required, since the burners are 

of the nozzle-mixing type. 

5.4 Flame control 

Flame control is performed using an ionisation electrode or 

optionally using a UV sensor. 

5.5 Hot air compensation 

In order to maintain the total connection rating constant in 

hot-air operating mode: 

1. Gas connection rating and gas pressure are reduced 

Total connection rating [%] 

100 

96 

90 

85 

80 

75 

0 50 100 150 200 250 300 350 400 450 

Combustion air temperature [°C] 

2. Air pressure is increased 

air pressure [%] 

200 

180 

160 

140 

120 

Gas connection rating 

Gas pressure 

100 

0 50 100 150 200 250 300 350 400 450 

Combustion air temperature [°C] 


Project planning information 

21 

5.6 Purging air/cooling air 

Cooling air at 20°C 

Air volume at rated capacity [%] 

Purging/cooling air volume for burner 

6 

5 

4 

3 

2 

1 

BIO/ZIO..K 

BIO, ZIO 

BIO/ZIO..KB..E 

0 

0 

700 800 900 1000 1100 1200 1300 1400 

Furnace temperature °C 

Purging air 

Depending on the furnace temperature, the burner must be 

cooled with a low air volume, being switched off, in order to 

avoid condensation due to the furnace atmosphere entering 

the burner housing. The air fan should not be switched off 

until the furnace has cooled down completely. 

Cooling air 

Thermal overload of the burner components must be avoided 

while the burner is switched off. The cooling air volume depends 

on the furnace and cooling air temperatures. 

The cooling air volumes in the diagram are given in standard 

cubic metres. 

12 

10 

8 

6 

4 

2 

Cooling air at 450°C 

Air volume at rated capacity [%] 

5.7 Emissions 

NOX 

[mg/m3] 

5% O2 

600 

500 

400 

300 

200 

100 

70 

50 

K (450 °C) 

H (450 °C) 

R, K (20 °C) 

H (20 °C) 

10 50 100 

Capacity [%] 

Flame shape: 

R = Normal 

H = Long 

K = Flat 

T Furnace 

= 1000°C 

Emissions for cold-air operating mode do not exceed the limits 

stipulated by the German Clean Air Directive. 

NO X values depend on the temperature, burner head, combustion 

chamber, furnace chamber, λ value and output (NO X 

values on request). 

If operated with LPG, NO X values are approx. 25% higher. 


Project planning information 

22 

5.8 Gas line connection 

To ensure accurate measurements of the pressure differential 

on the integrated gas measuring orifice for burners BIO as 

from construction stage E, the following applies for the design 

of the gas connection: 

– Ensure undisturbed flow to the gas connection on the burner 

for a distance of ≥ 5 DN. 

– Use a bellows unit with the same nominal dimensions as 

the gas connection on the burner. 

– Use a pipe bend up to an angle of 90° with the same nominal 

dimensions as the gas connection on the burner. 

– Only use reducing nipples with an external thread at both 

ends in order to reduce the nominal diameter on the burner 

(e.g. from 1” to ¾”). 

To ensure optimum flow, to avoid incorrect measurements and 

to enable burner operation with excess gas, we recommend 

the following: 

– Do not screw the manual valve directly into the burner. 

5.9 Air line connection 

Ensure there is a bellows unit and an air adjusting cock upstream 

of the burner. It is recommended to install a measuring 

orifice FLS to determine the air flow rate. 


23 

6 Technical data 

Gas supply pressure: approx. 20 to 60 mbar, 

Air supply pressure: approx. 25 to 40 mbar, 

each depending on flame shape and gas type (gas and air 

pressures – see burner diagrams at www.docuthek.com). 

Burner length increments: 100 mm. 

Types of gas: natural gas or LPG (gaseous); other gases on 

request. 

Heating: direct using a burner quarl or an attachment tube, 

indirect using a burner attachment tube inside the radiant 

tube. 

Control type: 

staged: On/Off, High/Low/Off, 

continuous: constant λ value. 

Most of the burner components are made of corrosionresistant 

stainless steel. 

Housing: 

BIO: GG25, 

BIOA: AlSi, 

ZIO: ST. 

Flame control: direct ionisation control (UV control as an option). 

Ignition: direct, electrical, lance as an option. 

Maximum furnace temperature: 

BIO/ZIO in burner quarl: up to 1600°C, 

with K burner head: up to 1100°C (higher temperatures on 

request), 

BIO/ZIO with burner attachment tube: up to 800°C (higher 

temperatures on request). 

Maximum air temperature: 

BIO, ZIO: 450°C, 

BIOA: 200°C. 


Technical data 

24 

Burner Rated capacity 1) Flame shape 

code letter 

Flame length 2) Flame outlet velocity 3) 

kW cm m/s 

BIO 50 40 R 30 15 

BIO 50 40 H 35 50 


BIOA 65 90 R 40 20 


BIOA 65 90 H 60 65 

BIO 65 90 K – – 












ZIO 165 630 R 80 20 

ZIO 165 630 H 160 70 

ZIO 165 630 K – – 

ZIO 200 1000 R 100 25 

ZIO 200 1000 H 200 80 

1) Higher capacities are possible – either on request or see burner diagrams at www.docuthek.com. 

2) Measured in the burner quarl from the front edge of the burner quarl, 6° open cone for R head, cylindrical for H head. The fl ame diameter is approx. 

one to two times that of the burner tube or burner quarl outlet. 

3) Referred to rated capacity, with a fl ame temperature of 1600°C for R burner head and 1500°C for H burner head. The fl ow velocity is increased when the 

outlet diameter of the burner quarl is reduced. The rated capacity must then be adjusted to the outlet diameter. 



25 

6.1 Dimensions 

d3 

n3 

h H 

LA 

L5 

k3 

D3 

L3 

S 

D 

d2 

F 

n2 

h H 30 

GA 

LA 

L5 

L3 

S 

D 

d2 

F 

n2 

GA 

L4 

L6 

L2 

L1 

k2 

D2 

L6 

L4 

L2 

L1 

k2 

D2 

L1 (burner tube length) and L2 (position of burner head) are variable (see Calculating the burner tube length) 



Burner 

Max. 

Dimensions [mm] 

capacity* 

Gas connection 

Air connection 

Weight 

[kW] D** GA LA H h S L3 L4 L5 L6 D2 k2 d2 n2 F D3 k3 d3 n3 [kg] 

BIO 50 40 50 Rp 1 / 2 Rp 1 1 / 2 50 38 12 73 149 240 127 181 151 12 4 75 – – – – 5.4 

BIO 65 90 65 Rp 3 / 4 Rp 1 1 / 2 62 48 12 73 156 246 127 195 165 12 4 95 – – – – 7.2 

BIOA 65 90 65 Rp 1 / 2 ∅ 48 80 44 16 95 170 261 149 195 165 13 4 88 – – – – 3.6 

BIO 80 150 82 Rp 3 / 4 Rp 2 112 55 14 90 172 272 140 240 210 14 4 110 – – – – 11.2 

BIO 100 230 100 Rp 1 Rp 2 100 60 16 103 185 285 153 240 200 14 4 120 – – – – 12.6 

BIO 125 320 127 Rp 1 1 / 2 DN 65 135 73 16 120 254 350 212 270 240 14 4 145 185 145 18 4 21.7 

BIO 140 450 140 Rp 1 1 / 2 DN 80 150 80 18 130 271 381 232 300 265 14 4 160 200 160 18 8 29 

* Cold-air connection, open fl ame, λ = 1,1 

** Approx. 10 cm larger in the case of a deviation from the standard length, as a weld seam is applied. 


Technical data > Dimensions 

26 

L6 

S 

d2 

F 

n2 

D 

Z 

I 

d3 

H 

GA 

L4 

LA 

D3 

k3 

L3 

L2 

L1 

k2 

D2 


Burner 

Max. 

Dimensions [mm] 

capacity* 

Gas connection 

Air connection 

Weight 

[kW] D** GA LA H h S L3 L4 L5 L6 D2 k2 d2 n2 F D3 k3 d3 n3 [kg] 

ZIO 165 630 165 R 1 1 / 2 DN 100 213 – 20 150 359 – 230 285 240 14 4 ∅ 220 220 180 18 8 26 

ZIO 200 1000 194 R 2 DN 150 220 – 20 220 469 – 340 330 295 22 8 ∅ 255 285 240 22 8 37 

* Cold-air connection, open fl ame, λ = 1,1 

** Approx. 10 cm larger in the case of a deviation from the standard length, as a weld seam is applied. 



27 

6.2 Burner lance 

6.2.1 BIO 

Gas connection: Rp ¼. 

Air connection: Rp 3/8. 

Gas pressure: 30 to 50 mbar. 

Air pressure: 30 to 50 mbar. 

L7 

6.2.2 ZIO 

Gas connection: Rp ¼. 

Air connection: Rp ½. 

Air 

L7 

B 

E2 

B 

gas 

E1 

I 

Z 

C 

E1 

W1 

I 

I 

Z 

Gas 

W2 

Burner 

air 

C 

Gas Air 

connection connection 

Dimensions 

B C E1 E2 L7 W1 W2 

mm mm mm mm mm ∠ ° ∠ ° 

BIO 80..L 57 54 7 10 177 36 45 




E2 

Burner 

Gas Air 

connection connection 

Dimensions 

B C E1 E2 L7 

mm mm mm mm mm 

BIO 165..L 118 77 27 71 382 

BIO 200..L 137 77 27 89 482 


28 

7 

Maintenance cycles 

Twice per year, but if the media are highly contaminated, this 

interval should be reduced. 


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1 Contact 

Elster GmbH 

Postfach 2809 · 49018 Osnabrück 

Strotheweg 1 · 49504 Lotte (Büren) 

Germany 

T +49 541 1214-0 

F +49 541 1214-370 

info@kromschroeder.com 

www.kromschroeder.com 

www.elster.com 

The current addresses of our international 

agents are available on the Internet: 

www.kromschroeder.com Sales 

Kromschröder, a product 

brand of the Elster Group 

We reserve the right to make technical 

modifications in the interests of progress. 

Copyright © 2007 Elster Group 

All rights reserved. 

03250786

BIO, BIOA, ZIO

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