UV Lamps

UV lamps, provided by SILAP,  are made of a quartz tube, sealed at both ends, containing  a small quantity of mercury and an inert  gas.

We provide UV lamps made of quartz glass with wavelengths from 185 to 400 nm.

Thanks to its high thermal and mechanical stability, quartz tube, used to produce UV lamps, has high transmission efficiency and it is highly transparent to UV radiation.

Different kinds of quartz tubes are used according to the type of UV lamp to be produced:

  • Natural quartz
  • Synthetic Quartz
  • Doped Quartz (Ozone Free)

1_who_wm

MEDIUM PRESSURE UV LAMPS

Mercury doped lamps

The mercury medium pressure UV lamps are appreciated mainly for UV curing and drying applications and UV disinfection and oxidation applications.

Two kinds of lamp technology are available for our customers:

  • “rolled sealed” lamps (A)
  • “pinched sealed” lamps (B)

Here below some explanatory drawings.

A – Rolled sealed lamps

The sealing process of the lamp occurs on a lathe under vacuum. While perfectly heated, the Quartz will collapse around the leaves of molybdenum.

2

B – Pinched sealed lamps

The sealing process takes place using a spiker pinching machine; the quartz, suitably warmed, is pressed by two hammers.

3

Metal halide lamps

For special applications, in addition to the usual mercury lamps, we provide a series of UV Lamps (Metal Halide) adding doping elements (metal halide) that change the spectrum of ultraviolet radiation, thus optimizing it for different possible applications.

Lamp doping and related spectra

The table below reports various lamp spectra in case of different lamp dopings:

UV MEDIUM PRESSURE MERCURY VAPOUR LAMPS

These UV lamps, emit across the entire spectrum of ultraviolet light (UVA, UVB and UVC) with peak emission in the UVA range at 366 nm.

4_who_wm

UV MEDIUM PRESSURE LAMPS GALLIUM DOPED

The metal halide UV medium pressure gallium doped lamps emit UV radiation with peak emission in the UVArange at 420 nm.

5_who_wm

UV MEDIUM PRESSURE LAMPS IRON DOPED

The metal halide UV medium pressure iron doped lamps emit UV radiation with peak emission in the UVA range at 366 nm and 440 nm.

6_who_wm

UV MEDIUM PRESSURE LAMPS LEAD DOPED

The metal halide UV medium pressure lead doped lamps emit UV radiation with peak emission in the UVA range at 357 nm and 420 nm.

7_who_wm

All lamps produced by us are available with different specifications/configurations, both in not doped quartz and in Ozone-Free quartz.

TECHNICAL SPECIFICATION

The main features of the medium-pressure UV lamps are as follows:

Quartz tubes
  • Natural Quartz (OF)
  • Natural Quartz (OG)
  • Synthetic Quartz (OG)
  • Outer diameter (OD) of the quartz tubes from 10 mm to 38 mm
Arc length from 50 to 2500 mm
Power range from 100 W to 60 kW
Shape of the lamp body
  • Linear
  • U form
  • Spiral
  • Other forms available upon request
Max nominal power density per unit length (to be checked in the prototyping stage)
  • from 80 W/cm to 300 W/cm*
  • from 80 W/cm to 120 W/cm**
  • from 80 W/cm to 250 W/cm***
Useful life (lab tested and according to the power of the lamp – one ignition per day)
  • from 1000 h to 1500 h*
  • from 1500 h to 5000 h**
  • from 1500 h to 5000 h***
Surface temperature (lab tested and according to lamp power) from 600°C to 900°C

 

We can produce medium pressure UV lamps suitable for almost all UV systems; the following is a list of the necessary information for spare parts:

  • Electrical Data (Power [W], Input tension [V0 – VL], Input current [A0 – AL])
  • Total length of the lamp (inclusive of terminal ceramic) (1)
  • Arc length (2)
  • Diameter of the quartz tube (3)
  • Cable length (4)
  • Type of ceramic terminal (5)
  • Type of electrical connection needed (6)
  • Type of reflector (7)
  • Lamp production of ozone Yes/No
  • Code of the lamp to be replaced

9_white