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Digital Temperature Indicator Controller


Digital Temperature Indicator Controller

Product Specification :

Model wise descriptions :

Temperature Indicators

Model Product Description Size (mm.)
DTI-720 3 and ½ digit Temperature Indicator 72 x72 x 120
DTI-720-FLP Temp. Indicator in Flame Proof Enclosure 350 x 200 x 160
DTI-480 ** 3 and ½ digit Temperature Indicator 96 x 48 x120
DTI-12 ** 3 and ½ digit Temperature Indicator 96 x 96 x 120
MTI-X Multipoint Temperature Indicator  (X = 2 to 8) 96 x 96 x 120
X=2,4,6,8 Selection using front panel Rotary switch of X positions or ways.  
DTI-484 4 and ½ Digit Temperature Indicator 96 x 48 x 120
DTI-1000 1” Display size 3 and ½ digit Temp. Indicator 192 x 96 x 160
DTI-2000 2” Display size 3 and ½ digit Temp. Indicator 192 x 96 x 160
DTI-4000 4” Display size 3 and ½ digit Temp. Indicator (Wall mounting enclosure) 500 x 250 x 150
(Models with ** are available with SMPS supply of 90 to 250VAC)

On-Off Temperature Controllers

Model Product Description Size (mm.)
DTC-300** Single set point on/off controller potentiometer setting 96 x 96 x 120
DTC-305** Dual Display Single set point on/off controller potentiometer setting 96 x 96 x 120
DSP-12** Two set point on/off controller potentiometer setting 96 x 96 x 120
DSP-30 Single set point on/off controller with variable hysteresis 96 x 96 x 120
DTC-720 -FLP Single set point on/off controller potentiometer setting but in Flame Proof Enclosure 350 x 200 x 160
DSP-722 - FLP Two set point on/off controller potentiometer setting but in Flame Proof Enclosure 350 x 200 x 160
LSC-120** 35 mm. DIN rail mount temperature safety controller 45 x 75 x 110
(Models with ** are available with SMPS supply of 90 to 250VAC)

Description :

Libratherm offers simple Digital Temperature Indicator Controller, which are low cost, accurate, rugged and reliable instruments available for indication and On/Off control for general-purpose temperature control applications. Indicators are available in display sizes of 0.5" to 4" to suit long distance visibility.

On/Off control is the simplest controlling method. When used for heating control the temperature sensed by the connected sensor is compared with the set point and when the temperature exceeds this set point, the heater is put OFF. When the temperature again drops below the set point, the heater is turned ON. So, depending upon the heating system design, inertia due to heat, the heat absorption by process or the natural losses, the temperature will oscillate above and below the set points by few degrees. When the application is for cooling control, the cooling device such as compressor or water circulating valves are turned OFF, when temperature drops below the set point and turned ON when the temperature rises above the set point. Special models are available for applications requiring variable hysteresis i.e. where the single device to be operated at two different set points. DIN rail mount temperature controller is also available as model LSC-120.

Some of the above models are also available in suitable size flameproof enclosures for use in the hazardous environment.


Features :
• Elegant appearance and compact in size.
• Accuracy better than ±  0.5 % of the full scale.
• Accepts standard type of thermocouple or RTD - Pt-100.
• Control output Relay or TRIAC or DC pulse for external SSR.
• Uses high quality potentiometer, and membrane switch for adjusting the set points.

Application :
• Heat treatment
• Furnace / Oven control
• Food processing
• Constant temperature Baths,
• Environmental chambers
• Plastic / Packaging / Pharmacy industry
• Cold Storage and Chilling plants
• Laboratory equipment etc.

Technical specifications :

Input   Thermocouple type J, K, RTD (Pt-100) / 2 or 3 wire (any one to be specified). 
Please refer to PDF File.
Ranges     Subject to the input.
Accuracy    Indicating accuracy better than ± 0.5 % of the specified range
Display    3.5 digits or 4.5 digits 0.5” Red 7-segment LED display.
Other Display sizes are model dependent as given in the above tables.
Set Points 
(One or Two)   
Adjustable using front panel multi-turn potentiometers with push to read membrane switches. (Single or Dual set points – as per the models)
Type of Control Outputs (DC pulse, Relay and Triac) a) Relay changeover contacts (rated for 6A @ 230VAC) – preferred for ON/OFF control.
b) Solid state relay driver (0 to 10) VDC logic pulse.
c) Built in AC Solid-state relay or Triac (rated for 10A @ 230VAC).
Output operation The outputs can be operated in high alarm or low alarm mode as per the requirement – please refer to the ordering information – Table
Hysteresis (Fixed)   2oC for ON/OFF action (for 1 oC resolution controller)
0.3oC for ON/OFF action (for 0.1 oC resolution controller)
Variable from 0.1/1 to 10.0/10 oC (model DSP-30)
SMPS Supply 90 to 250 VAC 50/60Hz (5VA max) (for some models marked **)
Linear Supply 230VAC or 110VAC +/- 10%, 50/60Hz
Size As given in the above tables. 72 x72, 96 x 48 and 96 x 96 , 192 x 96
Panel Cutouts 68 x 68, 92 x 44, 92 x 92, 186 x 92 mm ± 0.5 mm.
Enclosures 
(model based)
ABS Plastic /Metal powder coated with polycarbonate front, Aluminum Die cast housing for flame proof enclosures, Metal enclosures for large display.
(Models with ** are available with SMPS supply of 90 to 250VAC)

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