Kromschröder ZMI Pilot Burner

Pilot burner with a single ignition electrode, combined with an IFS / IFD or PFS / PFD automatic burner control unit

The ZMI pilot burner is suitable for many applications in the iron and steel, ceramics and non-ferrous metal industries and on heat treatment equipment. The ZMI can also be used as a stand-alone burner. Suitable for operation with natural gas, town gas or LPG.

• The pilot burner is ignited electrically and monitored by a single ignition and ionization electrode
• The ZMIC 28 with a ceramic head produces a longer, sharper flame. The ceramic tube has a long service life and suits high-temperature applications.
• Safe flame control by ionization electrode
• Reliable electrical ignition
• Slim, space-saving design thanks to single-electrode operation
• Can be used in many applications
• Capacity: 1 to 4 kW (ZMI 16: 1 to 2 kW; ZMI 25: 2.5 to 4 kW; ZMIC: 2.5 to 4.2 kW)
• Gas type: natural gas, town gas or LPG
• Burner tube length: 150 to 1000 mm
• Gas inlet pressure: ZMI 15 to 70 mbar; ZMIC max. 100 mbar
• Air inlet pressure: ZMI 15 to 90 mbar; ZMIC max. 120 mbar

Applications

According to Kromschröder, the ZMI pilot burner is for safely igniting gas burners on furnaces in the metal, ceramics and non-ferrous metal industries and on heat treatment installations. The ZMI can also be used as an independently operated burner. The pilot burner is ignited electronically and monitored by a single electrode (ionisation control).

Choosing the burner

Type code

• Gas letter: B = natural gas, G = LPG, D = coke oven gas / town gas.
• Flame tube length: ZMI from 200 mm in 100 mm steps (150 mm also available); ZMIC 28 from 300 mm; ZMIC 28..K with bellows unit from 400 mm in 50 mm steps.
• Thread: R = Rp internal thread, N = NPT internal thread (ZMIC is R only).
• The manufacturer’s order example: ZMI 16B200R.

Installation and supply

• Position the pilot burner so that reliable ignition of the main burner is guaranteed; the burner tip can be set exactly using the moveable burner bracket.
• Install pressure regulators and adjusting cocks in the gas and air lines upstream of the burner; for maximum flame stability the gas and air pressures of the ZMI or ZMIC must be higher than the connection pressure of the main burner. The manufacturer recommends filters in the gas and air circuits to protect the nozzles.
• When a ZMI is installed in a burner block its tip is under very high thermal stress, so cooling air must always pass through the 3 mm gap on the outside of the flame tube. For a ZMIC in a burner block the manufacturer recommends the version with bellows unit and about 140 mm of insulation around the ceramic tube.
• The tip of the flame tube must not come into contact with the main burner flame.

Standards

The ZMI and ZMIC comply with the requirements of EN 746-2 and the Machinery Directive 2006/42/EC, as confirmed by the manufacturer’s Declaration of Incorporation.

Information to send with a quote request

So that CAD can quote within 24 working hours, please send:

• Size and type: ZMI 16, ZMI 25 or ZMIC 28 (with or without the “K” bellows unit).
• Gas type (natural gas, LPG, town / coke oven gas) and the gas and air pressures available.
• Required flame tube length and connection thread (Rp or NPT).
• How it will be fitted: stand-alone or in a main burner block, chamber temperature; the burner control already used.