Digital Linearized Temperature Indicator / Controller
Product Specification :
Model wise descriptions :
| Model | Product Description | Size (mm.) |
| DLI-12 | Temperature Indicator 0.5" Display | 96 x 96 x 160 |
| DLI-1000 | Temperature Indicator 1" Display | 192 x 96 x 160 |
| DLI-2000 | Temperature Indicator 2" Display | 192 x 96 x 160 |
| DLI-4000 | Temperature Indicator 4" Display (wall mounting) | 500 x 250 x 150 |
| MLI-X | Multi-point Temperature Indicator (X=2,4,6,8,10) (Using rotary selector switch) | 96 x 96 x 160 |
| MLI-2 | 2 point indicator | |
| MLI-4 | 4 point indicator | |
| MLI-6 | 6 point indicator | |
| MLI-8 | 8 point indicator | |
| DLC-301 | Single Set Point Temp. Controller (4 digit T/W setting) | 96 x 96 x 160 |
| DSL-12 | Two Set Point Controller ( 4 digit T/W setting for each set point) | 96 x 96 x 160 |
Description :
Thermocouple sensors generating emf/mV and RTD sensors generating the change in resistance value with respect to the change in temperature does not have non linear characteristic, hence to indicate the temperature within the accuracy of 0.1 oC or 1 oC throughout the measurable range, the need arises to linearize these non linear curves.
Libratherm offers various models of Linearized Temperature Indicator / Controller for accurate indication of temperature within the accuracy of ± 1oC or ± 0.1oC in spite of non-linear behavior of the thermocouple and RTD (Pt-100) sensors. The Linearized indication is achieved by software linearization technique using 12 bit ADC and high-density memory, where the data’s are stored in. Along with the digital Linearized indications, single or dual set point control is also available. The Control action may be ON/OFF (through Relay/SSR/Triac). One of the application areas of this controller is to use it as the safety controller (or police protection) along with the microprocessor based PID or RAMP/SOAK program controller, where the indicating accuracies of both are matched without any ambiguity.
Features :
• Accuracy better than ± 0.1 % of the full scale.
• Elegant looks and Very easy to operate.
• Digital design and not prone to EMI/RFI.
Application :
• Heat treatment
• High temperature Furnace / Kiln control
• Star / Delta change over of heating coils
• Police protection with PID/Program controller
• Metallurgy and Ceramic R & D centres.
Technical specifications :
| Input | Thermocouple J,K, R,S, B, C, D or RTD (Pt – 100) {Any one to be specified} |
| Range | Full range of the specified input. |
| Accuracy | ± 1 oC for thermocouple and ± 0.1 oC for RTD input. |
| Display | 4 digit Red 7-segment LED display. (Display size is model dependent) |
| CJC | Automatic cold junction compensation using built in temperature sensor. |
| Set point | Adjustable using front panel push type coded wheels (Thumb wheels) |
| Control action | ON / OFF control. (For heating control and High / Low Alarm) |
| Control output | Potential free relay change over contacts and SSR driver (0 to 10VDC pulse @ 30mA) or Triac / AC SSR and SSR driver per set Point (DLC-301, DSL-12). Relay contacts and AC SSR are rated for 6A @ 230VAC. |
| Hysterisis | ±1oC for ON/OFF action (for 1oC resolution controller) ±0.1oC for ON/OFF action (for 0.1oC resolution controller) |
| Output Indication | The front panel LEDs marked OUT Or OUT1 and OUT2 |
| Supply Voltage | 230VAC / 110 VAC ± 10% (5VA), 50/60Hz |
| Size | 96 x 96 x 160 mm, 192 x 96 x 160 mm and as per the table given above. |
| Enclosure | Metallic duly powder coated with ABS bazel and polycarbonate front |
