Charles Austen EnviroSure 120 Alarm

Charles Austen EnviroSure 120 Alarm

Charles Austen EnviroSure 120 Alarm is an aeration-system low-pressure alarm intended for sewage-treatment and critical aeration systems where loss of air pressure needs an immediate warning. This page identifies the exact model, duty figures and selection limits so it can be compared accurately with the other products in the range.

Charles Austen is both the product brand and supplier. The figures below come from the current 2026 supplier catalogue, supported by manufacturer guidance where a current technical page is available. Maximum figures are not the same as guaranteed installed performance: pipework, depth, pressure, media loading and maintenance all affect the result.

Who is the ENVIROSURE120 best suited to?

This model is best considered for sewage-treatment and critical aeration systems where loss of air pressure needs an immediate warning. It sits 2 of 2 when the range is ordered by nominal output/capacity. That makes it easier to judge whether it is a compact entry model, a mid-range choice or one of the higher-output options before comparing price alone.

Key product features

• Detects low pressure associated with pump failure or airline loss
• Provides a visible and/or audible warning depending on configuration
• Designed for quick integration with aeration installations
• Useful for reducing unnoticed treatment-system downtime
• Exact SKU and manufacturer part number: ENVIROSURE120.
• Supplied through Charles Austen and linked to compatible models for easier range comparison.

Technical specification

Technical figures are nominal supplier ratings. The calculated 24-hour energy figure, where shown, is rated wattage × 24 hours and does not include tariffs or intermittent thermostat operation.

Understanding the published specification

Airflow and pressure must be read together. The published airflow is a maximum rating; the installed airflow will be lower if the pump has to overcome greater water depth, a restrictive diffuser, narrow airline, long pipe runs, non-return valves or a heavily throttled manifold. Pressure is not an optional extra specification: it is what enables the air to reach the diffuser and pass through its membrane or pores.

The catalogue specification for this exact model is See supplier sheet. Where the page includes a calculated daily-energy figure, it is provided only to make continuous-running products easier to compare; it is not an electricity-cost estimate and does not replace the rated power shown above.

How to size this model correctly

EnviroSure 100 and 120 are configuration-specific products. Confirm the required plug-in, hard-wired, beacon or panel connection before ordering because the price list does not publish the electrical interface.

For critical livestock, treatment or commercial systems, allow spare capacity and consider redundancy. If the required duty is close to the model’s maximum, moving to the next size normally provides a more useful operating margin than running a smaller unit continuously at its limit.

Installation and commissioning

Installation format: Installed on the airline or alarm circuit in the configuration specified by Charles Austen. Keep access available for cleaning and servicing, use appropriately sized hoses or airline, and avoid unnecessary bends or restrictions. Aquatic electrical equipment should be protected by a suitable RCD and installed in accordance with the supplied instructions.

After installation, check every outlet for a stable bubble pattern and listen for a change in pump tone. A branch with weak output may be restricted or longer than the others, while a pump that becomes noticeably louder or hotter can be working against excessive back pressure.

Commission the complete system by checking actual flow, pressure, water level or temperature at the point of use rather than assuming the headline maximum will be achieved. Recheck after filters, diffusers or pipework have had time to accumulate normal fouling.

Compatible system components

For aquarium and small-reservoir work, match each outlet to an air stone, sponge filter or aeration device that can accept the available flow. Fine-pore stones, check valves and deep tanks add resistance. Keep the pump above water level where possible; otherwise use a correctly oriented non-return valve and route the airline to prevent siphoning.

Compatibility should be confirmed from the complete installation: connection size, hose or airline bore, voltage, control method, permitted flow and future servicing access can all affect whether two individually suitable products work correctly together.

Maintenance and service life

Test the alarm deliberately at commissioning and at planned intervals. A monitoring device is only protective if its warning can be seen or heard and the pressure connection remains clear.

Record the installation date and normal operating performance. A visible reduction in output, increasing noise, rising temperature or repeated tripping should be investigated rather than compensated for by restricting or altering other parts of the system.

Performance checks and fault finding

If airflow falls, test the system methodically: inspect the intake, disconnect the manifold to compare unrestricted output, check the airline for leaks or kinks, and clean or replace fouled diffusers. Only diagnose internal pump wear after external restrictions have been ruled out. For critical aeration, keep a contingency pump or alternative oxygen source available during servicing.

Compare any suspected fault with the clean, newly commissioned condition. Changes across every outlet or return normally point to the main unit or a shared restriction; a problem affecting one branch is more likely to be local pipework, airline, a valve, diffuser or connected accessory.

Compare similar aeration alarms

The table below links to five nearby models so the buyer and search crawler can move through the range without returning to a search page.

Model	Key published duty	Product type
ENVIROSURE100	See supplier sheet	Air Pump Failure Alarm
V60	60 L/min · 0.3 bar · 35 W	Air Pump
ACO007D	140 L/min · 1.0 bar · 130 W	Air Compressor
ACO009	110 L/min · 0.35 bar · 102 W	Air Compressor
ACO009E	140 L/min · 0.35 bar · 112 W	Air Compressor

Complete the system and explore the range

The supplier and customer-facing brand for this listing is Charles Austen. The links below connect this model to its dedicated range, relevant system components and the wider Charles Austen catalogue.

• Browse the Charles Austen EnviroSure Alarms
• Browse all Charles Austen products
• Charles Austen air-pump service kits
• Pond and lake diffuser stations
• Standard sinking airline
• Heavy-duty sinking airline

Technical information sources

Core model figures were checked against the current 2026 Charles Austen supplier catalogue. Family features, installation points and application guidance were cross-checked against current manufacturer technical material where available.