Neptune Systems PM1 pH/ORP Probe Module

pH/ORP Probe Expansion Module for the Neptune Systems Apex.

• Compatible with all Apex Systems.
• Dual Functionality: Choose Between pH and ORP Monitoring.
• I/O Port for Breakout Box Connection.
• 2 AquaBus Ports.

pH/ORP Probe Port.

The PM1 can be used with either a pH or ORP probe, depending on what you’re looking to monitor. For example, if you’re running two aquariums near each other, you can connect a pH probe to the PM1 and run both tanks off the same Apex system. Or maybe you have a calcium reactor and need to monitor the pH inside to automate a CO2 solenoid. Alternatively, you could connect an ORP probe and automate specialized equipment like an ozone generator.

Temperature Probe Port.

This module also features a temperature probe port. An additional temperature probe allows you to monitor the temperature of another aquarium or even the temperature of the ambient air around your aquarium, depending on where you place the temperature probe.

I/O Port.

The PM1 Module features an I/O port, which is how you can connect your Apex to the Breakout Box, one of the most underrated and underutilized Apex accessories. The Breakout Box allows you to connect up to 6 different switches or buttons to trigger feed modes, timers, and more.

What’s Included?

PM1 Module.

3′ AquaBus Cable.

Warranty & Support

This product carries a 1-year manufacturer warranty on hardware from the date of purchase. Probes are consumable items and carry a 90-day warranty.

Warranty support is handled by us directly. Message our WhatsApp support with your order number and we will diagnose the fault first. Most cases are solved by replacing a single part, so you rarely need to send the whole unit. If the item does need to come back, it ships to our Delhi warehouse, and courier cost in both directions is borne by the customer. Your GST invoice is valid proof of purchase for the claim.

Backorder & Dispatch Timeline

This item is stocked to order. Back-orders are consolidated and placed with our overseas suppliers once a month, on the last day of the month, and all such orders are shipped before the 15th of the following month.

Back-orders cannot be cancelled once they have been placed with the supplier. If you cancel before that, payment-gateway charges of 2% plus GST are deducted and the balance refunded. In the rare case a supplier cannot fulfil the item, we will offer you an alternative first, and refund in full with no deduction if you would rather not take it.

Setup & Use

Connect the PM1 to the Apex with the included 3 ft AquaBus cable, then set the input up as pH or ORP in the Apex. The probe is sold separately and plugs into the pH/ORP port. Calibrate it with standard solutions before you trust the readings. The module also adds an extra temperature port and six switch inputs.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number, or email us if you would rather, and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 48 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.