Drayton Probes - Products


		Section 1 - Oxygen Probe System

		The CARBON PROBE is the heart of all Drayton systems. The probe is designed to measure furnace carbon potential even in the most hostile of environments, by combining proven zirconia-based technology with robust construction. The result is that the most subtle of atmosphere changes can be detected. Two models are available, the most commonly used ST-Standard Temperature (600-1100 Deg C), and the HT-High Temperature version (600-1500 Deg C). Various sensor lengths and sheath constructions allow a wide range of options, to suit the many different types of furnace designs and atmospheres.

	Probe Features Include: • sensor location hole - eliminating movement of the sensor tube • atmosphere flow apertures in the outer sheath - allowing better gas flow across the sensor tip • standard self clean facility - enabling regular carbon burn-off • standard plug & socket arrangement - for quick release • use of outer sheath as outer electrode - eliminating use of wire and acting as heat sink against thermal shock • reference air hole outlet - allowing improved flow of reference air to the inner side of the sensor



		Drayton Probe Design


	The Drayton design allows for easy refurbishment, and all sensors are pressure-tested to ensure leak-free operation. All new Drayton probes are supplied with a full 12-month warranty, backed by a prompt after-sales and repair service.



	Typical Drayton Dual Loop Control Unit

Drayton work closely with Eurotherm Controls Ltd to provide a range of purpose-built systems, each designed to suit clients’ specific needs. The degree of sophistication depends entirely on process requirements. From low-cost monitoring units to fully-computerised control installations, the Drayton range provides the right option for heat treaters.

Monitoring systems comprise probe and reference air unit/burn off facility. Components include an industrial pump, filter, flowmeter, valve and fused mains isolator. The burn-off unit contains a 3-way sonenoid valve and recycling timer.

More sophisticated control systems include the Dual-Loop Furnace Atmosphere and Temperature Control Unit. Powerful, innovative software is the key to these advanced, flexible systems. Information is fast and accurate - multiple stored programs, 500 program segments and composite tuner are just a few of the software features.

Comprehensive management systems to further enhance customers’ options can also be tailored to meet precise requirements. Based on real time, multi-tasking packages, they can provide, for example, load control, quality assurance and inventory control. Screen data is clear, detailed, and available on convetional monitors or touch sensitive screens.


	Section 2 - Quenchant Testing Systems

For the past decade Drayton has led the world in the design and manufacture of integrated systems for cooling curve analysis of quenching media.

The Drayton LABORATORY QUENCHMASTER system complies in every respect with the Standard Test adopted by the working party set up by the Wolfson Heat Treatment Centre Engineering Group at Aston University. It is internationally recognised as the most accurate, reliable and cost-effective method for analysing the cooling characteristcs of quench oils, aqueuos polymers, molten salt and brine, and the system meets the ISO 9950 International Test Specification.

In 1990 Drayton’s PORTABLE QUENCHMASTER was introduced as a means of determining quenchant performance in-situ.

Drayton Quenchmaster measures quenchants according to time/temperature data generated by immersing a heated thermal probe into a heated quenchant. Further processing of the data yields a cooling curve. These curves enable the system user to study quenchant behaviour throughout the 3 stages of the quenching process - vapour, boiling and convection.


	The three stages of the Quenching Process



	1 Vapour At high component temperatures a vapour blanket is formed around the workpiece. This acts as an insulator, preventing the quenching oil from contacting the metal surface. As a consequence, the rate of cooling during this stage is slow.



	2 Boiling As the temperature of a component drops, the vapour blanket becomes unstable and collapses, allowing the oil to come into contact with the metal surface. Violent boiling quickly removes heat from the quenched component, resulting in the cooler fluid coming into contact with the workpiece. Maximum cooling rate is achieved during this stage.



	3. Convection When the temperature of the component has dropped below the boiling point of the quenching oil, heat loss is by convection only. This is the slowest of the three stages.

QUENCHMASTER applications include:

• Routine quality testing
• Diagnostic work
• Safety checks
• Process control
• Quenchant selection
• Development of new formulations


	[home] [profile] [products] [latest] [response]