Engineer's Selection Guide
Matching the Chamber to Your Test Standard and Specimen
Five decision steps — test standard, temperature range, specimen size, humidity requirement, and controller specification — to match the right chamber type and volume to your test programme. Start with your test standard, not your temperature range.
Start with the Test Standard
The test standard determines the chamber type — not the temperature range. Many engineers start with temperature range and then discover the chamber type is wrong. Start here: what standard does your qualification document, customer spec, or regulatory submission reference?
Define Your Temperature Range
Refrigeration system architecture determines the minimum temperature the chamber can reach. Specifying a lower temperature than needed adds cost; specifying too high means the chamber cannot run your test. Match the range to the coldest temperature in your test programme.
Ramp rate note: If your test standard specifies a minimum temperature ramp rate (e.g. 3°C/min or 10°C/min for JEDEC), state this requirement explicitly. Standard chambers typically achieve 2–4°C/min cooling. Higher ramp rates require a larger compressor system and may reduce usable volume.
Size the Chamber
Industry guideline: specimen volume (and any fixturing) should not exceed 20% of total chamber volume. Exceeding this ratio compromises air circulation uniformity and temperature recovery time after door opening.
For vehicle-level or full-system testing, Indeecon's walk-in chambers are custom-built to your floor area and height requirement — no standard catalogue size applies.
Humidity Requirement
If any current or future test requires a humidity specification, choose a T&H chamber. A temperature-only chamber cannot add humidity capability after manufacture.
No humidity required
Temperature-only chamber — lower cost, simpler maintenance, faster ramp rates for the same compressor size.
Standard humidity (20–95% RH)
T&H chamber — covers IEC 60068-2-78, MIL-STD-810 Method 507, most OEM specs.
Extended humidity (10–98% RH)
T&H chamber with extended humidity — needed for some pharmaceutical and materials testing specs.
Below 10% RH
Requires dry air injection (nitrogen or compressed dry air). Specify this separately — it is not standard on most T&H chambers.
Controller and Data Logging
The controller specification depends on your test programme complexity and compliance requirements. Over-specifying adds cost; under-specifying means you cannot run complex profiles or provide the audit trail required by regulated industries.
Basic PLC
Simple pass/fail testing — manual set-point, no profile programming. Suitable for incoming QA and non-regulated applications.
PLC with programmable profiles
Cyclic profiles, ramp-and-soak sequences, alarm logging. Required for IEC 60068-2-30 and similar cyclic tests.
IoT / Cloud + Audit Trail
IQ/OQ RequiredRemote monitoring, data export, and electronic batch records. Recommended for pharmaceutical and medical device labs.
Connectivity options: Indeecon chambers are available with USB data export (standard), RS-485 Modbus for SCADA/PLC integration, and Ethernet / Wi-Fi for remote monitoring and alert notifications.
Summary
Equipment
Temperature & Humidity Chamber
Programmable T&H testing — IEC 60068-2-78, MIL-STD-810, ICH Q1A
View productTemperature-Only Chamber
Dry heat and cold testing without humidity — IEC 60068-2-1/2
View productThermal Shock Chamber
Sub-10-second transitions — IEC 60068-2-14, JEDEC JESD22
View productWalk-In Test Chamber
Vehicle and large-specimen environmental testing — custom dimensions
View productFAQ
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