COLD TESH CHAMBER
TECHNICAL SPECIFICATIONS
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Chamber inner dimension |
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Temperature range | -55° C to +35°C |
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Temperature Accuracy | +/- 0.5° C. |
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Temperature resolution | 0.1° C. |
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Temperature Uniformity | 2.0ºC |
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Temperature Stability | 0.5ºC |
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Rate of cooling | 1ºC/min |
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Insulation | 100 mm High density low K factor bonded rock-wool & puff insulation for avoid the atmospheric water vapor condensation on the exterior of the unit and non – hygroscopic nature. |
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Chamber interior | 304 grade stainless steel. |
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Chamber exterior | MS Powder coated |
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Heating system | Easily removable U-shaped jacketed air heaters connecting with Teflon wires. Interlocking for preventing the operation of heating system without air circulation. The heaters will be placed in the conditioning plenum such that there is no direct radiation from the heaters on to the test specimen. |
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Refrigeration system | Emerson make compressor with Air-cooled refrigeration systems. Ozone friendly refrigerant R-404a sealed compressor provided for low temperature. The system is provided with adequate safety protection against excessive and low pressure and temperature. Pressure gauges provided to indicate suction and head pressure. HP/LP cut off switch and overload protection for the system, Oil separators with oil return & hot gas defrost system. All refrigeration components like expansion valve, driers, oil separators, pressure gauges and vibration eliminators provided. Reputed company make like Danfoss – Denmark, Wika – Germany. |
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Door & Gasket | Robust type hinges fitted on the right hand side of the chamber with front opening single door. Leak proof double lined silicon gasket will be provided. The inner surface of the door will be provided with pre – polished stainless steel and will be mounted such that conduction is avoided. |
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Viewing window | Toughened clear glasses sealed with silicone and separated by spacers to form a completely vaccumised window. Defogger heaters will be provided with an auto cut – off. Suitable lighting will be provided to view the specimen under test. |
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Control instrumentation | PID CONTROLLER |
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Temp. Sensor | PT 100 RTD sensor |
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RS 232 or 485 communication port. (Optional) |
RS 232 or 485 communication port provided for operates the chamber through PC as well as data logging facility. Tubular display & graphical display provided with complete history printing & storing facility. |
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Safety Provisions | a) High and low temperature safety provided with audio visual Warning signal for the protection of the specimen. b) Overload protection provided for all the components used in the chamber as well as control panel. c) Complete electrical and refrigeration system provided to conform to the statutory regulatory requirements against safety, hazards, accidents and pollutions. d) Over temperature thermostat & thermal fuses provided for Heating system. e) Pressure gauges for measuring the refrigerant and service manifolds provided in the refrigeration system. |
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Electrical controls | MCB, Main Switch, Fan control switch, compressor ON/OFF switch with indicator, Dry heater switch with indicator, System fault indicators. Trip indicators with Alarming (buzzer) system for safe and easy of operation. |
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Power Supply | 230 V AC/415V AC 3 Phase , 50 Hz |
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Manual | Operating instructions and service manuals provided with complete schematic diagrams of refrigeration, electrical and mechanical components. |
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Calibration | Calibration from NABL accredited laboratory. |