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

FEATURES :

• Single channel temperature monitor with 2 independent outputs
• Over-temperature trip output (“Policeman” controller)
• Temperature operated lock / unlock output (door interlock)
• Volt-free changeover relay contacts for each output
• Fused live + neutral supplies available for each relay contact
• Ambient temperature trip function
• Factory set trip temperatures or ...
• Installer settable trip temperatures via optional USB lead & Windows app.
• 2-part pluggable terminal blocks for ease of wiring & maintenance
• Installer selectable thermocouple type
• Audible coded warning of temperature trip via buzzer
• Visual indication of the state of each output via red/green LEDs
• Accurate - with cold junction compensation
• DIN rail mounting
• Other mounting options available

DESCRIPTION:

The ST121 is a protection device designed to fit to kilns, furnaces, ovens & similar heating processes to help guard against over-firing. It trips off if the process temperature exceeds the preset trip temperature. The trip output is used to remove heating power. When tripped the ST121 sounds a warning buzzer and the red/green TRIP lamp shows red. To reset the ST121 the mains power supply has to be cycled on/off. The ST121 also provides a temperature operated safety lock output. This can be used to operate a motorised or solenoid door lock to prevent the inadvertent opening of a firing chamber door when the internal temperature is too high. The red/green LOCK lamp shows red when locked. The buzzer is not associated with the LOCK function. An ambient temperature monitoring and trip function is also provided. This helps guard against over-heating due to lack of sufficient ventilation by removing heating power. The warning buzzer is coded so that the reason for a trip condition can be quickly identified.