Pressure test unit M-07

Overview
The M07 alternating-pressure test bench from Poppe + Potthoff is a modular test system for validating liquid-cooling components under realistic thermal and pressure conditions. It is designed for applications in e‑mobility, automotive and electronics where coolant circuits must withstand dynamic pressure cycles and temperature variations.

Test medium
Typical test medium: glycol/water mixture (example: 50% ethylene glycol / 50% water). Tests can also be performed with water, hydraulic oils or other customer-specified coolants. Flow rates and media are configurable to match the component under test.

Test procedure (example standard: M‑07)

• Referenced standards: M‑07 (example), GS 95024‑3‑1 M‑07, MBN 10306 M‑07, VW80000 M‑07, GMW14193 and similar OEM specifications.
• Objective: expose components to alternating pressure with coolant while applying dynamic ambient and media temperature profiles to simulate operational conditions; verify mechanical integrity and leak-tightness under pressure fluctuations.
• Negative-pressure conditions: filling and evacuation steps replicate sub-atmospheric conditions; negative-pressure tests may use air/gas or liquid media depending on the procedure.

Test procedure — M‑07 parts

• Part 1 — Pressure pulsation (alternating pressure): pmin = 0.5 (−0.1) bar abs, pmax = 2.0 (+0.1) bar abs; frequency ≈ 25–35 cycles/min; typical cycles = 100,000 (configurable).
• Part 2 — Overpressure: test pressure ≈ 4.0 (+0.1) bar abs; duration = 1 hour under varying temperature conditions.
• Part 3 — Negative-pressure: test pressure ≈ −0.01 bar abs; duration = 30 minutes. Usually performed with gas/air; alternatively a glycol solution at 0.5–1 bar (below atmospheric) can be used to simulate sub-atmospheric conditions.

Capabilities of the test benches

• Execute alternating-pressure (pressure swing), overpressure and underpressure (vacuum) tests with programmable pressure curves.
• Support dynamic ambient and media temperature control and synchronized temperature profiling during cycles.
• Long-duration testing: benches can run for hours to several weeks/months depending on required cycle counts.
• Negative-pressure testing available with gas or liquid media; configurable flow control (typ. 20–60 l/min, higher on request).
• Data acquisition and recipe management via LabVIEW/PLC integration; options for climate chamber and shaker integration.

Applicable components / typical use cases

• Battery cooling circuits, battery housings and thermal management assemblies.
• Power electronics cooling plates, high-voltage coolant heaters, PTC heaters and related HVAC components.
• Piping, fittings, valves and connectors for coolant lines used in EV powertrains and electronics.

Standards & references

• M‑07 family (example)
• GS 95024‑3‑1 M‑07
• VW80000 M‑07, MBN 10306 M‑07, GMW14193

Technical specifications (summary)

• Typical pressure range (M07 coolant setup): 0.5–4.5 bar abs (parts configurable).
• Pressure pulsation: pmin = 0.5 (−0.1) bar; pmax = 2.0 (+0.1) bar; frequency = 25–35 cycles/min; cycles typically 100,000–200,000 (configurable).
• Overpressure: ≈ 4.0–4.5 bar abs (1 h)
• Negative-pressure test: ≈ −0.01 bar abs (30 min) or liquid-simulated sub-atmospheric conditions.
• Typical coolant flow: 20–60 l/min (configurable per application).
• Temperature range: example −40 °C to +90 °C (extended ranges available depending on configuration).
• Media: water, ethylene glycol/water, hydraulic oils or custom fluids.
• Control & data: LabVIEW interface, recipe management, PLC (e.g. Siemens S7) integration.