How can we help you?

• Verify your climatic, thermostatic, or low-temperature chamber at PCA AB 308 accredited laboratory and obtain a calibration certificate with measurement uncertainty U (k=2)
• Measure temperature uniformity ΔT and stability δT at 9–27 points in the working volume per EN 60068-3-5 and EURAMET cg-11 guidelines
• Meet GMP Annex 15, ISO 9001 cl. 7.1.5, and ISO/IEC 17025 requirements for OQ/PQ qualification of measuring equipment
• Order on-site verification at your premises throughout Poland - COCH mobile measurement team with multi-channel recorder and Pt100 sensors
• Receive complete documentation (calibration certificate, temperature distribution contour map, ΔT and δT results) within 3–5 business days of the measurement session

Types of Chambers and Equipment Covered

COCH verifies all types of chambers used in industry, laboratories, and clinical research:

| Chamber Type | Temperature Range | Standards Applied |

|-------------|-------------------|-------------------|

| Climatic chambers (T+RH) | -40°C to +180°C; 10–98% RH | EN 60068-3-5, DIN 50014 |

| Thermoclimatic chambers (thermal shock) | -70°C to +200°C | EN 60068-3-5, IEC 60068-2-14 |

| Thermostatic cabinets and drying ovens | +5°C to +300°C | DIN 12880, EN 60068-3-5 |

| Low-temperature chambers | -80°C to -150°C | EN 60068-3-5 |

| Humidity chambers (no T control) | 10–98% RH | ASTM E 145, ISO 483 |

| Water baths | -20°C to +200°C | Per client requirements |

Measurement Methodology - Temperature Uniformity and Stability

Measurements are performed per EN 60068-3-5 and EURAMET cg-11:

Temperature uniformity (ΔT) - difference between the hottest and coldest point in the working volume under steady-state conditions. Measured at a minimum of 9 points (3×3 grid), and for large chambers (>500 l) at 27 points.

Temperature stability (δT) - maximum temperature change at a single point over time; measured for at least 30 minutes after conditions have stabilised.

Temperature gradient - vertical and horizontal temperature distribution; critical for natural convection chambers.

| Parameter | Typical Values |

|-----------|---------------|

| ΔT uniformity | ±0.5°C to ±3°C (depending on chamber type) |

| δT stability | ±0.2°C to ±1.5°C |

| Measurement uncertainty U | 0.1–0.5°C (k=2, p=95%) |

| Number of measurement points | 9 (V < 100 l) - 27 (V > 500 l) |

Industry and Regulatory Requirements for Chamber Verification

• GMP (Good Manufacturing Practice) - EU GMP Annex 15 (IQ/OQ/PQ qualification); WHO TRS 961 Annex 9 for drug stability chambers; metrological traceability required
• ISO 9001:2015 - monitoring and measuring resources control (cl. 7.1.5); a chamber used for testing must have a current calibration certificate
• ISO/IEC 17025:2017 - calibration and testing laboratories; SI traceability required; certificate must include measurement uncertainty U (k=2)
• EN 60068 (IEC 60068) - environmental tests; chamber uniformity must meet test method requirements (e.g. ±2°C for method Ab, ±3°C for Ca)
• ASTM E 145 / ISO 483 - humidity chambers for packaging and materials testing

What Does a COCH Calibration Certificate Include?

A calibration certificate issued by PCA AB 308 accredited laboratory includes:

• Chamber identification (manufacturer, model, serial number, year of manufacture)
• Test conditions (ambient temperature, humidity, stabilisation time)
• Temperature/humidity measurement results at all points (table and contour map)
• Determined uniformity ΔT and stability δT for each setpoint
• Expanded measurement uncertainty U (k=2, p=95%)
• Traceability to GUM national standards (ITS-90 scale) and BIPM
• Assessment of fitness or qualified working area
• Certificate number, PCA logo, validity date

Step-by-Step Verification Procedure

1. 1Order - client provides chamber type, temperature/humidity range, nominal setpoints, required standards, and purpose (calibration / OQ/PQ qualification)
2. 2Planning - COCH determines measurement schedule, number of points, and grid spacing
3. 3Measurements - multi-hour measurement session per nominal setpoint; 1-minute logging with multi-channel recorder using Pt100 and capacitive RH sensors
4. 4Analysis and report - ΔT, δT, U calculations; calibration certificate issue
5. 5Document delivery - calibration certificate PDF + original within 3–5 business days of the measurement session

Frequently Asked Questions