The performance parameters are determined with an empty test space according to IEC 60068-3-5. The cooling rate is specified in the range of 10–90% of the temperature range. Thanks to the CO2 low temperature of −50°C, the test chamber will maintain the specified cooling rate down to at least −27°C (temperature range 180°C to −50°C corresponds to 230 K. 10% is 23 K. −50°C + 23 K = −27°C).
New refrigeration technology with more power in the low temperature range
Our new CO2 refrigeration technology achieves a test chamber temperature of up to −50°C in our climate chambers and temperature chambers. It is more powerful in the low temperature range than the previous −40°C refrigeration technology. At the critical point of −40°C for many test standards, the new refrigerating units still provide considerable cooling capacity and heat compensation. Traditional, single-stage refrigeration technology can hardly cool test specimens below −30°C.
In all Weiss Technik test chambers, the previous −40°C refrigeration technology is being replaced by new CO2-based refrigeration technology without changing the design, connections, and dimensions of the units. The environmental parameters also remain the same. Infrastructure such as cooling water, connectors, and accessories can continue to be used. Only a few technical parameters have changed.
units with CO2 refrigeration technology
New: Fuses with 300mA required due to frequency converters
The cooling water temperature remains the same: 12-28°C.
Ambient temperatures of up to 35°C are no problem.
The dimensions, size and footprint of all appliances remain the same.
The new Simpac 2.0 controller has a ring buffer, Linux, and NTP.
An electronic cooling water regulator allows a lower water pressure.
The new CO2 refrigeration technology can cool down to -50°C.
Power consumption and power consumption are lower than before.
Lower sound pressure level: CO2 refrigeration has smaller, quieter components.
IEC 60068-2-14 Nb: Sufficient heat compensation in the holding phase at -40°C. No cascade system necessary.
System pressure up to 120 bar, but significantly smaller cross-sections and volumes. No problem with the Pressure Equipment Directive.
CO2 has GWP1 and is not flammable.
| Parameter | previous −40°C class | new CO2 refrigeration |
|---|---|---|
| Refrigerant GWP | 1397 | 1 |
| Energy consumption | lower | |
| Sound pressure level | quieter | |
| Rate of temperature change, cooling guaranteed up to | −18°C | −27°C |
| Temporal temperature deviation | 0.1–0.5 K | 0.1–0.5 K |
| Spatial temperature homogeneity | 0.5–1 K | 0.5–1 K |
| Cooling water temperature | 12–28°C | 12–28°C |
| Ambient temperature | 28/35°C | 28/35°C |
| Footprint | identical | |
| Installation room (practical limit value) | 2.8 m³ per kg R449A | 14 m³ per kg CO2 |
| Pressure equipment category | None | None |
| S!MPATI® ports | additionally 62542 for ASCII 2050 & 2051 |
| Type / Test Space | -40°C class (not available from 2025 anymore) | CO2 class (available) | -70°C class (available) |
|---|---|---|---|
| LabEvent (temperature / climate) | |||
| 20 litres | on request | -- | |
| 34 litres | 5 K/min | -40°C 4 K/min | -70°C 5 K/min |
| 64 litres | 3 K/min | -40°C 3 K/min | -70°C 3 K/min |
| 100 litres | 5 K/min | -50°C 4 K/min | -70°C 3 K/min & 10 K/min |
| 150 litres | 5 K/min | -50°C 4 K/min | -70°C 3 K/min & 10 K/min |
| 110/210 litres | 3 K/min | -50°C 3 K/min | -70°C 3 K/min & 5 K/min |
| 500 litres | -30°C 3 K/min |
-50°C 3 K/min (from January 2025 also 6K/min) |
-60°C 3 K/min |
| ClimeEvent & TempEvent | |||
| 180 litres | 3 K/min & 5 K/min | 3 K/min (January 2025: 8K/min) | 3 K/min & 5 K/min |
| 340 litres | 3 K/min & 5 K/min | 3 K/min (January 2025: 6K/min) | 3 K/min & 5 K/min |
| 600 litres | 3 K/min & 5 K/min | 4 K/min (January 2025: 9 K/min) | 3 K/min & 5 K/min |
| 1000 litres | 3 K/min & 5 K/min | 10 K/min | 3 K/min & 5 K/min |
| 1500 litres | 3 K/min & 5 K/min | 7 K/min | 3 K/min & 5 K/min |
| 2000 litres | 3 K/min | on request | 3 K/min |
| 270 litres | 10, 15, 20 K/min | 2025 | 202510, 15, 20, 25 K/min |
| 480 litres | 10, 15, 20 K/min | 2025 | 10, 15, 20, 25 K/min |
| 800 litres | 10, 15, 20 K/min | 2025 | 10, 15, 20, 25 K/min |
| 1300 litres | 10, 15, 20 K/min | 2025 | 10, 15, 20, 25 K/min |
| XXL 1600 litres | 3 K/min & 5 K/min | -50°C >4 K/min | 3 K/min & 5 K/min |
| XXL 2450 litres | 3 K/min & 5 K/min | -50°C >3 K/min | 2 K/min & 4 K/min |
| XXL 3400 litres | 3 K/min & 5 K/min | -50°C >2 K/min | 2 K/min & 4 K/min |
| Walk-in (9m³ - 21m³) | 2 K/min | alle -50°C (>2 K/min) | all sizes -70°C (>2K/min) |
The performance values are measured according to IEC 60068-3-5 in the range of 10–90% of the entire temperature range.
All our appliances with special functions will also be available with CO2 refrigeration from 2025:
- ShakeEvent
- SunEvent
- AirEvent Gas & AirEvent Ozone
- Constant climate chambers
- R-chambers
Many rapid coolers (>10 K/min) are available with CO2 and are measured on request.
All models are available on request without F-gas, some with longer delivery times.
Downloads
Refrigerants I F-gas Regulation Overview
FAQ