| Active RTD | The active RTD detects and outputs a signal to the Electronics Module which is proportionate to the process media temperature plus heat added by the heater. |
| Bypass | Indicates the unit is in “Start-up Bypass Mode”, which forces both relays to be energized for the duration of the Start-up Bypass Timer. |
| Fault | Indicates a self-test error (call Technical Support for further information). |
| Heater | The part of the sensing element that heats the active RTD. |
| Interface | The point where two different processes meet (as in oil & water). |
| LED | Light Emitting Diode |
| Local Enclosure | The enclosure attached to the sensing element. (Normally contains the Electronics Module). |
| Mounting Base Plate | Connection for CLASSIC 800 series Electronics Module and Terminal Wiring Assembly |
| Reference RTD | The Reference RTD detects and outputs a signal to the Electronics Module which is proportionate to the process media temperature. |
| Relay 1 | Indicates Relay 1’s coil is energized. |
| Relay 2 | Indicates Relay 2’s coil is energized. |
| Remote Enclosure | Enclosure for the Electronics Module. Used when the Electronics Module must be located away from the sensing element (extreme heat, vibration, convenience etc.). |
| RCM, RCMS | Kayden Remote Control & Monitoring Software provides a graphical computer interface for the CLASSIC series. |
| RTD | Resistance Temperature Detector; a sensor whose resistance varies with temperature changes. |
| Run Mode | Indicates normal operation when flashing. |
| Set Point 1 | Indicates when the Thermal Signal Bar Graph is displaying the value of Set Point 1. |
| Set Point 2 | Indicates when the Thermal Signal Bar Graph is displaying the value of Set Point 2. |
| Thermal Offset | Thermal convection |
| Thermal Signal | The amount of thermal energy dissipated from the Active RTD by the process. |