Stafford Instruments Ltd | maufacturer of temperature controllers | pyrometers | thermocouples

ST222 Kilnsitter Upgrade Kit

This kit contains all the equipment necessary to upgrade your exsisting 13A Plug in Kiln (presently using a Kilnsitter) to a fully temperature controlled kiln using a ST222 controller.

1 x ST222 Plug in controller ( you choose a 13A UK version or a 16A European Schuko version)

1 x ST222 Wall Bracket / Stand

1 x 6 inch Type "R" Labhead Thermocouple

1 x 2m Thermocouple interconnect cable

1 x User Handbook

1 x Installation Handbook

Free Technical support



ST222 FEATURES:
• Designed for small plug-in kilns (up to 3kW)
• Easy to retro-fit to kilns without controls
• Ideal for glass, enamelling, bead annealing & general ceramics use
• 9 programs - each with up to 9 segments
• 1 controlled heating / cooling ramp + 1 soak per segment
• Soak times up to nearly 100 hours
• Ramp rates from 1 to 999°C/hour + full
• Controlled heating & cooling ramps
• Programs can be reviewed or altered while firing
• Program Pause & Segment Advance facilities
• Delayed start facility - up to 4 days
• Power failure recovery
• Energy used display
• Selectable thermocouple types
• Extensive kiln safety monitoring with alarm buzzer
• Complete with bracket for wall mounting or as a desk stand

GENERAL DESCRIPTION :
The ST222 is a 9-program plug-in controller designed for general glass, ceramics & pottery use. The controller comes with a 2m lead and 13A plug that plugs into a Domestic 13A Socket. ( A 16A Schuko Plugged variant is available for the European Market). The kiln plugs into the 13A socket on the front of the controller. Each program can have up to 9 segments. It is fully adjustable with heating and cooling indicators & continuous display of segment number. Each segment comprises of a ramp followed by a soak. Ramps can be heating or cooling. The ST222 executes a controlled ramp to the soak temperature where it dwells for the required period then executes the next segment. The end of the program is marked by selecting ‘End’ while entering a ramp rate. Natural cooling then follows.

HOW IT WORKS

The exisiting Kiln power cable fitted with a 13A plug is plugged into the controllers 13A Socket.

The controllers 13A power lead is plugged into a domestic 13A socket

Closely examine your kiln, look for a vent hole or inspection hole of a minimum of 12mm diameter that can be used for placing the themocouple into the firing chamber through the kiln outer wall. The position of the hole ideally needs to be between 2/3 rds and 3/4's of the way up from the bottom of the firing chamber floor. Measure the thickness of the kiln wall at this appropriate point, from the outside metal case, to the inner firebrick face and add 1.5" or 36mm to this measurement. Providing this measurement is no greater than 6" (150mm) thats ok. If a longer thermocouple is required then contact us for a price ( the additional cost will only £6 per extra inch). If there isn't a suitable hole you will have to carefully drill a 12mm hole through the case of the kiln - and through the firebrick, to allow a thermocouple to be inserted, taking great care not to damage the heating elements.

The supplied themocouple has to be inserted into the kiln firing chamber. This can be done either byputting it through a spy hole or through a carefully drilled hole through the kiln wall and firebrick. The thermocouple should be preferably fitted with an adjustable flange. This will allow the thermocouples insertion depth to be set to the optimum 3.5 – 5 cm inside the firing chamber. The flange has holes drilled in it to allow easy fixing to the outside of the kiln case (self tapping screws).

Next the Kiln Sitter has to be over-ridden. Place a small cone (milli-bar) into the kiln sitter that is two cones higher in value than your maximum target temperature. Next make shure that the timer has enough time in hours to complete the programmed firing

Finally set all the kiln switches and energy controls on maximum before starting the firing. The controller will, when started fully control the kiln.