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On the PEM-HG generators the water trap drains itself and needs no service medium. The blue silica gel is regenerated once it has turned pink, in an oven at 120 °C for 60–120 minutes. The 5 Å molecular sieve shows no colour change and is changed or regenerated monthly, at 300 °C for 120–240 minutes. Filter intervals for analysers and detectors depend on the configuration.

Deionised or distilled water below 0.5 µS/cm, equivalently above 2 MΩ·cm. Never add KOH, NaOH or any other electrolyte: it destroys the membrane and voids the warranty. Empty, rinse and refill the tank every 30 days even if the level has not fallen, because standing water picks up conductivity and biological growth.

The PEM-HG blinks its Alarm LED, sounds the buzzer every 10 seconds and writes the message to line 4 of the LCD. Water empty, water over and pressure over each stop generation until the cause is cleared. Alongside the alarms, check the water-level LEDs and the silica gel colour daily and keep the 30-day water change.

Benchtop units can be installed by qualified personnel following the installation guide. For central supply systems and multi-channel detection we recommend commissioning by our team — it's included in most offers.

Warranty service is not free of charge where the generator is operated outside its operating manual, parts are disassembled by the user, the rated generation capacity is exceeded, or water of insufficient quality is used. Consumables and normal wear are excluded; the covered period is confirmed in your offer.

Common parts ship from stock within 3–5 business days; express delivery is available for urgent cases. Mark your request as urgent and we prioritise it.