High-Low Temperature Test Chambers Technical White Paper – Precision Solutions for Temperature-Environment Reliability Testing –

Temperature is the most fundamental—and most brutal—physical parameter influencing the reliability of materials, components and complete systems. GB/T 2423.1, GB/T 2423.2, GJB 150.3A, GJB 150.4A, DO-160 Section 4/5, IEC 60068-2-1/-2 and MIL-STD-810H all quantify requirements for temperature slew rate, dwell time, heat load and measurement uncertainty. Drawing on 25 years of environmental-simulation experience, Linpin Instruments releases the LP/GDW family of high-low temperature test chambers. The series delivers fully compliant, traceable and reproducible test platforms, and is ready for non-standard customisation and multi-chamber parallel operation to meet the differentiated needs of national key laboratories, third-party inspection bodies and large/medium enterprises.

Core Technical Specifications
Temperature range
Model A: –20 °C ↔ +150 °C
Model B: –40 °C ↔ +150 °C
Model C: –60 °C ↔ +150 °C
Model D: –70 °C ↔ +150 °C
(90 % of military & civil reliability tests are covered; +180 °C optional.)
Slew rate (empty, linear programmable)
Heating: 1.0–3.0 °C min⁻¹ (+25 °C → +150 °C)
Cooling: 0.7–1.0 °C min⁻¹ (+25 °C → –70 °C)
10 °C min⁻¹ rapid-change package per GJB 150.4A available.
Temperature deviation & uniformity
Deviation: ≤ ±1.0 °C (9-point GB/T 5170.2 method)
Fluctuation: ≤ ±0.3 °C (after 30 min stabilisation)
Calibration uncertainty: U = 0.1 °C (k = 2, traceable to NIM/NIST).
Heat-load capacity
+85 °C: ≥ 2 kW dissipative load
–55 °C: ≥ 1 kW dissipative load
Slew rates maintained without derating.
Internal volume
Standard: 100, 225, 500, 1 000, 1 500, 2 400 L
Non-standard up to 6 m³ in one cell; 20 m³ drive-in configurations available.
Viewing & handling
210 mm × 275 mm or 395 mm × 395 mm multi-layer conductive-film glass window with automatic defrost
Optional 360° panoramic window and cold LED lighting for high-speed cameras or optical metrology.
Mechanical & Safety Design
Insulation
120 mm high-pressure polyurethane + micro-fibreglass composite, λ ≤ 0.022 W (m·K)
External surface rise < 10 °C (GB 20154-2020).
Refrigeration
Cascade system with Copeland/Bitzer hermetic compressors; eco-refrigerants R-404A + R-23
Inter-stage heat exchanger, oil separator, smart PID hot-gas bypass for –70 °C continuous duty
Protections: high-pressure, overload, phase-loss, phase-reversal, oil-differential; independent relief valve & blast wall; EU PED 2014/68/EU compliant.
Heating
Ni-Cr finned elements, power density < 1.5 W cm⁻², life > 20 000 h
Solid-state relay power control, contactor-free, longer MTBF.
Air circuit
Top outlet, bottom return, variable-frequency fan
Adjustable SS guide vanes, 9-point uniformity ≤ 1.0 °C
German EBMPAPST high-temperature motor, Class F, independent thermal protector.
Safety chain
Dual independent overtemperature protection (set-point +5 °C / +10 °C)
Earth-leakage ≤ 30 mA, trip ≤ 0.1 s
Specimen power terminal isolated; 4 mm² earth stud provided
Conforms to GB 4793.1 & IEC 61010-1; optional CE, ETL, ATEX.
Control & Data Integrity
Controller hardware
7″ or 10.4″ TFT colour touchscreen, 1024 × 768, multi-language
Industrial PLC + auto-tuning PID, resolution 0.01 °C, 100 ms control cycle
Interfaces: USB, RJ45, RS-485, Wi-Fi, 4G-cloud; 32 G eMMC, 10-year continuous logging.
Software functions
1 200 segments, 999 cycles, ramp/soak/jump/formula, PID groups
FDA 21 CFR Part 11 e-signature, audit trail, tamper-proof data
Remote APP, WeChat mini-program, SMS & e-mail alarms
Exports CSV/PDF; seamless link to LabVIEW, MATLAB, Minitab.
Application Fields & Typical Tests
Aeronautics & Astronautics
Avionics radar, INS, flight-control computers, satellite power units: high-altitude cold-start & high-temperature ageing.
Defence & Military
Missile seekers, EO pods, soldier radios: cyclic temperature & low-temperature storage per GJB 150.3A/4A.
Automotive & Rail
Traction batteries, inverters, OBC, wiring harness: high-low temperature cycling & thermal shock per ISO 16750-4, GB/T 31467.3.
New Energy & Storage
Li-ion cells, modules, packs: 200 cycles –40 °C ↔ +85 °C, capacity retention > 80 %.
Consumer & Industrial Electronics
Smart phones, laptops, server boards, LED engines: cold start, high-temperature operation, temperature gradient per IEC 60068-2-1/-2.
Materials & Chemicals
Composites, adhesives, seals, PCB substrates: Tg, CTE, low-temperature brittleness.
Non-Standard Customisation & Parallel Systems
Custom designs
Walk-in chambers up to 12 m × 6 m × 3 m
LN₂ boost ≥ 15 °C min⁻¹ rapid-change units
Integrated IR cameras, fibre-optic thermometry, automatic fixtures for in-situ metrology.
Parallel operation
“One-drive-two” or “one-drive-four” centralised refrigeration, independent control, saves > 30 % floor space
EtherCAT master-slave synchronisation; A-tank low / B-tank high energy-sharing cuts power by 25 % year-round.
Quality Assurance & After-Sales
Manufacturing & inspection
ISO 9001:2015 & GJB 9001C-2017 quality systems
48 h continuous cycling, 12 h full-load slew, 4 h leakage & earthing test before shipment
Third-party calibration certificate traceable to NIM or NIST supplied with every unit.
Service network
32 service centres nationwide; 2 h response, 24 h on-site, 72 h closure
Warranty: 1 year whole machine, 3 years compressor, 10 years structural parts
Lifetime free software upgrades & calibration support
Digital equipment file for predictive maintenance; MTBF ≥ 8 000 h.
Conclusion
Engineered to military-grade rigour and incorporating internationally advanced refrigeration, heating, control and data-security technologies, the LP/GDW series provides a total solution for temperature-reliability testing in aviation, aerospace, defence, automotive and new-energy industries. We guarantee measurement-traceable accuracy and whole-life service, ensuring that every test result stands up to national accreditation, international mutual recognition and the scrutiny of history.
For technical consultation, customised solutions or on-site demonstrations, please contact the Sales Engineering Department of Linpin Instruments.
Linpin Instruments – Recreating the World through Temperature, Achieving Reliability for the Future.