New Products

 The company have manufactured photochemical components operating in the UV region of the electromagnetic spectrum for many years, interest has been shown in being able to irradiate the reactant contained in the two types of reaction flasks with daylight radiation.

A 150 watt Daylight lamp and power supply has been introduced to be operated with the large quartz immersion well Model 3230 and reaction flasks listed below.

150W Daylight Lamp

The lamp produces predominantly visible radiation in the range of 400-700nm.

WARNING: The lamp also produces dangerous UV radiation.

WARNING: The lamp contains Mercury and must be disposed of in
accordance with local Health and Safety Regulations.

Daylight Lamp
150 watt Daylight lamp
150 watt Daylight Lamp Spectrum
Daylight Lamp Characteristics
Nominal Wattage Overall Length (mm) Discharge Length Diameter (mm) Model
150 385
Short arc

Radiated heat produced by lamp

Tests have been carried out to measure the rise in temperature on the surface of the immersion well with the cooling water circulating and lamp operating.

With the cooling water running at 2 litres per minute with the lamp switched off the temperature on the surface of the immersion well was 15°C. With the lamp switched on the immersion well surface temperature reached 70°C. Increasing the water flow rate did not result in lower temperatures.

Lamp Temp Recorded (°C)
150W Daylight

Power Supply

Model 3040 irradiance spectrum
Power Supply

As arc sources possess negative voltage-current characteristics and conventional low-impedance power supplies cannot be used, a power supply with the appropriate reactive-type having a large resistance or inductance in series, is available.  This provides extra power to initiate the arc and reduce the power for continuous operation.  Input voltage 200-240VAC, 50-60Hz.

150 Watt Power Supply Characteristics
Model Wattage Dimensions (mm) Weight (kg) Lamp Model
150 220

Immersion Well

Only the large immersion well may be used with the 150W daylight lamp. A PTFE tube extends to the bottom of the annular space to allow coolant liquid to flow upwards from the bottom of the well.  The space between the walls allows filtering of certain wavelengths with coolant liquids such as cobalt, nickel, copper sulphate, sodium nitrate solutions.

Immersion Well Characteristics
Overall length (mm) Inside diameter (mm) Outside diameter (mm) Length from top of joint to bottom of well (mm) Joint Glass type Model
390 38 58 300 70/50 Quartz

Cutting off Radiation below 300nm

If it is required to cut off radiation below 300nm, use glass filter sleeve 3408

Full details of liquid cut-off filter solutions are supplied with instruction manuals.

Reaction Flasks

Three types of outer reaction flasks are available for use with the 159W daylight lamp, all are made of borosilicate glass and are fitted with one central ground socket to take the large immersion well and other smaller sockets for a reflux condenser ( Model 3391) or drop-in funnel, sampling port etc.  Flasks may be supported by conventional laboratory stands and clamps.For more detail on flasks see the Immersion Well Reactors page

Reaction Flask Details
Reactant Capacity (Nominal) (ml) Central joint Flask type
Standard Gas inlet Flow through
Model Nos.
200 70/50 3314
300 70/50 3307
400 70/50 3308
1000 70/50 3309

2000 70/50 3310


Operating and Safety instructions

The reactor components and lamp must be operated inside a laboratory fume extraction enclosure.

When the lamp is due to be operated the reactor should be screened with the reflective metal foil supplied, this is wrapped around the flask and other exposed parts, the foil will reflect light back into the reactant and also, avoid distraction to personnel present in the vicinity.

The lamp should handled carefully by holding the brown insulation frame support at the top, and lowered gently into the immersion well.

The electrical lamp plug is designed to fit the electrical lamp power supply in one position only, the plug should be viewed before it is inserted into the power supply socket to ensure it is in the correct position, the retaining cap has a thread and is rotated to secure the plug and socket together. 

The large quartz immersion well should have a clean water flow of 2 litres/minute, this should keep the lamp operating at the correct temperature, a flow monitor (PRC2) is available to protect the components if the water flow fails whilst the lamp is operating.     

Do not attempt to start the lamp when it is hot, allow the lamp to cool down, this can take up to 30 minutes with the cooling water flowing through the immersion well.
If you attempt to start when hot the lamp will not light.