ST325 / ST326 Multizone Kiln Temperature Controller

ST325 / ST326 Multizone Kiln Temperature Controller from Stafford Instruments Ltd

By: Stafford Instruments Ltd  17/05/2011
Keywords: Kiln Temperature Controller, ST325, ST326,



  • Multi-zone: 1, 2 or 3 heating zones
  • 32 programs - each with up to 32 segments
  • Each segment is a controlled heating / cooling ramp + soak
  • Suitable for glass or ceramics use
  • Soak times up to nearly 100 hours
  • Ramp rates from 1 to 999°C/hour + full
  • Programs can be reviewed or altered while firing
  • Program Pause & Segment Advance facilities
  • Keyboard lockable
  • Delayed start facility - up to 4 days
  • Power failure recovery
  • Energy used display
  • Event / Damper / Fan relay output
  • Alarm relay with alarm buzzer
  • Mains power switch
  • Micro-SD memory card reader


The ST325 is a 32-program controller designed for glass, ceramics & pottery use. Each program can have up to 32 segments. It is fully adjustable with a detailed 4-lamp mimic display & continuous display of segment number. Each segment comprises of a ramp followed by a soak. Ramps can be heating or cooling. It executes a controlled ramp to the soak temperature where it dwells for the required soak 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.

Setting Up
Press theÆkey to flash the program number display – this can be changed if required with theÇ&Èkeys. To change any of the controller’s settings press theÆkey (or reverse with theÅkey) until the required lamp on the mimic display flashes. The current value will be displayed together with the units (°C, °C/hr or hr.min). Change the displayed settings with the Ç& Èkeys which can be held down for acceleration. All settings are remembered while the controller is powered off. The keyboard can be locked to prevent tampering.

The START/STOP key is used to commence or halt a firing. The progress of the firing is shown on the mimic display. If a start delay has been set then the delay time remaining will be displayed. During firing the settings can be reviewed and altered if required, the program can be paused/resumed or a segment can be advanced. During soaking the soak time remaining and the soak temperature are alternately displayed. In the event of a power failure the controller will intelligently re-commence firing when power returns.

The ST325 is fitted with a total of 5 relays - these are designed to drive contactor control gear. It can be configured to drive 1, 2 or 3 heating zones. There is a standard alarm relay (with alarm buzzer) and there is a configurable 5th relay which can be used as an event relay, damper relay or fan relay. The ST325 is fully configurable and is fitted with a micro-SD memory card reader which can be used to automatically set or change the configuration. The card reader can also be used to update the embedded firmware to add future enhancements etc. For single zone use the ST325 can be supplied fitted with a lead + a Harting 7D connector. For multi-zone use a lead + Harting 15DX connector can be supplied. The ST325 is supplied with a metal holster style wall mounting bracket.

Further Information

Click to Download the Installation Manual

Click to compare the ST325 to the ST326

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Keywords: Kiln Temperature Controller, ST325, ST326,

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