Rapid Temperature Change Chamber

Temperature Range	-70°C to +180°C
Temperature Accuracies	±0.1°C to ±1.2°C measured at control sensor   Resolution: 0.1°C
Temperature Uniformity*	< 1000 Litres: ≤1.5°C. 1000 to 2000 Litres: ≤2.0°C. > 2000 Litres: ≤2.5°C.
Temperature Rate of Change	▪ Heating & Cooling: 10°C/min average as per IEC 60068 3-5 for above temperature range Measured at control sensor between +155°C to -45°C in an empty chamber                                    ▪ Heating & Cooling: 5°C/min linear from +120°C to -40°C in an empty chamber
Relative Humidity	10% to 98% in the climatic range of 10°C to +85°C
Humidity Accuracies	Set Point Fluctuation: ±3% RH
Noise level	Below 75 dBA (measured at 1-meter distance)

• Internal workspace constructed with high-grade stainless steel, equipped with LED illumination for clear visibility.
• Large digital display mounted on the door for easy monitoring of temperature.
• Multilayer vacuum-insulated viewing window with integrated defog heaters for clear observation during operation.
• Chamber door provided with imported compression cam locking system for proper air sealing, along with a key interlock for safety.
• Door-mounted controller with internally routed harness cables for reliable power supply and communication.
• Imported heavy-duty caster wheels with built-in manual level adjusters for easy mobility and precise levelling.
• Adjustable shelf provision to position the DUT (Device under Test) at the required height.
• Ensures precise temperature accuracy, delivering reliable and consistent test results for various test specimens.
• Imported heavy-duty die-cast hinges for smooth, friction-free door operation.
• Turbulent airflow design with stainless steel hub and anti-rust axial fan blades to ensure uniform air circulation and improved temperature distribution inside the chamber.

• Exterior body constructed using minimum 2 mm thick CRCS sheets, finished with high-quality powder coating for superior durability, precision, and aesthetics.
• Internal test chamber made of high-grade stainless steel for corrosion resistance and long service life.
• Chamber structure is welded using automated X-ray welding technology, ensuring warp-free construction with 100% air- and water-tight leak-proof integrity.
• The inner chamber and outer body are insulated with high-density mineral wool, eliminating air pockets and minimizing heat loss and thermal conduction.
• Multi-level diagonal airlock sealing using silicone rubber ensures excellent air tightness and thermal isolation.
• Integrated LED illumination inside the chamber with configurable auto cut-off timing.
• Multi-layer vacuum-insulated viewing window with nitrogen-filled air gaps and built-in thermal control defog heater for clear visibility.
• Equipped with door open sensors, enabling automatic safety shutdown and on-screen alerts during operation.
• Feed-through access ports (Ø115 mm / Ø65 mm) provided on either the right or left side for connecting test specimens under active test conditions.
• Mounted on 4-inch heavy-duty caster wheels along with levelling pads for easy installation, movement, and stability.
• Heavy-duty door hinges with up to 120° swing, designed for smooth, friction-free operation.
• Supplied with one adjustable stainless steel rod-type shelf for flexible specimen placement within the test space.

• Easy-access conditioning plenum designed for convenient maintenance and servicing.
• Single-moulded, lightweight high CFM coaxial fan ensures efficient and uniform air circulation throughout the chamber.
• Vibration-free induction motor with stainless steel, joint-free extended shaft and external flange mounting for reliable and stable operation.
• Modular conditioning unit comprising heat exchangers, air circulation system, and heating system for optimized thermal performance and easy maintenance.

• Mechanical cascade refrigeration system with hermetic / semi-hermetic compressors for achieving low-temperature performance.
• Semi-hermetic compressors are mounted on dual-stage suspension systems using compression springs and rubber bushes, tightened to optimized torque for vibration-free operation.
• Utilizes eco-friendly, non-CFC refrigerants such as R-404A / R-23 in an air-cooled refrigeration configuration.
• Evaporator heat exchanger coils are made from oxidation-resistant materials, with fully collared and bullet-expanded tubes for enhanced heat transfer efficiency.
• Equipped with an automatic bypass control system based on suction pressure and temperature, ensuring stable performance under variable and no-load conditions while maintaining precise temperature control.
• Efficient oil return management system to protect compressors from lubrication failure and ensure long operational life.
• Additional isolation suspension channels with anti-vibration pads are provided to further minimize vibration and noise levels from the compressor system.
• For water-cooled refrigeration systems, the required chilled water must be supplied by the user.

• Inconel sheathed / bare nichrome air heaters are used to achieve the desired temperature efficiently and reliably.
• Heaters are strategically positioned within the conditioning section to prevent direct heat radiation onto the test specimens.
• Heater output is controlled using zero-crossing relays / thyristors, ensuring precise temperature control and superior system stability.
• Heaters are electrically isolated using high insulation resistance isolators, preventing earth leakage and enhancing operational safety.

• Self-pressurized, fine-control humidity generator designed to ensure condensation-free operation.
• Automatic humidity purge system integrated based on the set humidity value to maintain stable conditions.
• Humidity generator equipped with:

Water level float switch

Over-temperature protection thermostat

Inconel immersion heater for efficient vapour generation

Automatic water level control through a water inlet solenoid valve

• Refrigeration-based de-humidification system for achieving low relative humidity (RH) levels with precise control of dew point temperature.
• Independent automatic control of dew point temperature to maintain accurate and stable low RH conditions inside the chamber.
• High-accuracy electronic humidity sensor for direct RH measurement, suitable for operation across a wide temperature range.
• Built-in condensation protection features to prevent moisture formation during thermal transitions, ensuring safe operation for electronic component testing.

• 7” resistive analog colour touch screen with WVGA (800 × 480 pixels) resolution, supporting 16M colours and LED backlight for clear visibility.
• Up to 4 fully isolated serial communication ports (2 × RS-232 and RS-422/485) for flexible connectivity.
• 10/100 Base-TX Ethernet port for external device communication and remote operation.
• Dual USB host ports for connecting USB mouse, keyboard, and external storage devices.
• 3 user-programmable soft keys with LED indication for quick access to frequently used functions.
• Supports up to 99 programs, each with 99 segments and up to 999 repeat cycles for complex test profiles.
• Nested looping capability within programs and segments to meet diverse testing requirements.
• Graphical program editing interface for faster configuration and easy program visualization.
• Auto PID tuning across the full operating temperature range based on test profile requirements.
• Real-time trend display with user-defined scaling for monitoring performance.
• Three-level security access for controlled user permissions.
• Digital pressure monitoring for refrigeration compressor gases.
• Subsystem/component lifecycle tracking with runtime hour display.
• Calibration due alerts to ensure measurement accuracy and compliance.
• Advanced compressor diagnostics, including monitoring of oil level, discharge temperature, winding temperature, suction temperature, and run hours, with automatic report generation.

• Electromagnetic interference (EMI) filter on incoming power supply for noise suppression.
• Surge protection system for safeguarding against voltage spikes.
• MPCB protection for all individual three-phase power devices.
• MCB protection for all individual single-phase power devices.
• Comprehensive input power protection including single phasing, phase reversal, under-voltage, and over-voltage protection.
• High and low temperature mechanical safety protection (floating type) for reliable hardware-level safety.
• High and low temperature software safety limits for enhanced operational control.
• Over-temperature thermal protection for heaters to prevent overheating.
• Mechanical high/low pressure safety protection for the refrigeration system.
• Software-based high/low pressure protection for additional refrigeration safety.
• Built-in winding thermal protection for compressors (applicable for semi-hermetic compressors only).
• Compressor oil level protection (OPS) for lubrication safety (applicable for semi-hermetic compressors below 10 HP).
• Compressor high discharge temperature protection to prevent overheating and damage.

• Power Requirement:

415 VAC ±5%, 3 Phase, 50/60 Hz, 4 Wire + Earth (E).

• Space Around the Chamber:

A clearance of 500–600 mm must be maintained on three sides (excluding the front) for water-cooled systems.

• Drain Connection:

1” BSP drain outlet provision.

• Ambient Temperature:

The chamber should be operated in an environment where the ambient temperature does not exceed 45°C.

Notes:

• Temperature uniformity is specified for the range of -40°C to +125°C and is measured from the centre point in accordance with IEC 60068-3-5:2001.
• Temperature ramp rates are average values and do not represent linear rates of change. Performance is based on laboratory conditions of 22–25°C for air-cooled systems. For water-cooled systems, performance depends on maintaining the required water temperature, flow rate, and pressure as specified.