Aqua Medic mV Computer-Set

• Active control, not just monitoring – a built-in relay switches connected equipment on and off based on the measured redox value, unlike the Aqua Medic mV Monitor, which displays only.
• Wide measurement range – reads from -1,999 mV to +1,999 mV, with a settable control range of -1,000 to +1,000 mV.
• Adjustable hysteresis – set the switching deadband (Aqua Medic recommends 5–10 mV) so the relay doesn't chatter on and off around the set point.
• Two control directions – switch equipment on rising redox (an oxidiser) or falling redox (a reducing agent), depending on what you're controlling.
• Refillable platinum-tip probe – polysulfone-bodied electrode with a BNC connection, rated for short-term use to 60°C, and refillable rather than disposable.
• Power-loss memory – set points are retained through a power interruption, so the controller doesn't need re-programming after an outage.

The relay output is rated to switch loads up to 1,000 W at 5 A on 230 V mains – enough headroom for a typical aquarium ozoniser or a small dosing pump, but check the wattage of whatever you're connecting against this figure before wiring it in. This rating describes what the controller can switch, not how much power the controller itself draws, which is minimal for the electronics alone.

Suited to marine reef tanks running ozone for redox control, and to any setup where a piece of equipment needs to switch automatically at a redox threshold. Not suitable as the sole safety cut-off for equipment that needs a hard fail-safe – pair ozone use with proper ventilation and the ozoniser manufacturer's dosing guidance, since over-dosed ozone is harmful to fish and to people in the room.

mV Computer-Set control unit, refillable redox probe with electrode holder, reference/calibration solution, and BNC connection cable.

Calibrate the probe against a known reference solution on a regular schedule, and refill its internal electrolyte with Aqua Medic KCL Solution as part of that routine – a probe that's drifted out of calibration will control the relay against the wrong number even though the display still looks normal. Replace the probe when it no longer holds calibration.

Mains-powered at 230 V / 50 Hz, supplied for use on Australian household power. If controlling an ozoniser, follow the ozoniser manufacturer's dosing and ventilation guidance – ozone is hazardous in excess and this controller only holds redox at the set point you give it, it does not police safe ozone limits on its own.

• Aqua Medic KCL Solution for pH & mV Probes 60 mL – for probe calibration and refills.
• Aqua Medic Injection Set – for refilling the probe's electrolyte cleanly.

Covered by the Aqua Medic manufacturer warranty against defects, in addition to your rights under the Australian Consumer Law. Standard parcel delivery Australia-wide.

What's the difference between this and the Aqua Medic mV Monitor?

The mV Monitor displays redox only. The mV Computer-Set adds a relay output that actively switches connected equipment – typically an ozoniser – on and off to hold redox near a set point.

Can it control a dosing pump instead of an ozoniser?

The relay can switch any 230 V load up to 1,000 W / 5 A, so a dosing pump is possible, but check the pump's own control logic – most peristaltic dosing pumps expect a timed or metered signal, not a simple on/off redox trigger, so confirm compatibility before relying on it.

How often does the probe need calibrating?

On a regular schedule rather than only when the reading looks wrong – redox drift is gradual and easy to miss on the display, which is why the relay can end up controlling against a stale number.

Is this safe to leave controlling ozone unattended?

It's designed for that use, but pair it with proper ventilation and the ozoniser manufacturer's dosing guidance rather than relying on the controller as the only safeguard.