Salinity Module: PM2 - Neptune Systems

Salinity Module: PM2 - Neptune Systems
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  • Salinity Module: PM2 - Neptune Systems

Salinity Module: PM2 - Neptune Systems

57% Recommend this to a friend (4 of 7)

SKU: 207495
In Stock: 58
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Quick Overview

Why does BRS recommend this?

Having the ability to monitor the salinity of your reef tank is a very valuable piece of information.  Usually if something is to go wrong with your tank, you will usually see a change in salinity from temp, to a top off unit being stuck on, if you have a Neptune Apex Controller we highly recommend investing in the PM2 module and salinity probe.

Add the Salinity Module: PM2 to your Apex Neptune System.

  • Real-time monitoring of salinity in reef aquarium

  • Module has extra Temp Probe port

  • I/O Switch Inputs for ATO, feed buttons, leak alarms, etc.

  • Probe Sold Separately.


Full Details

Features of the Neptune Systems Salinity Expansion Module:
  • Monitor/Control Conductivity/Salinity and temperature
  • 4 Measurement ranges (0-900 uS/cm, 0-9.0 mS/cm, 0-90.0 mS/cm, 0-50 ppt)
  • 6 digital inputs for float switches, water on floor sensors, pressure sensors, etc
  • Full datalogging support in Apex Base module
  • Up to 240 AquaBus modules can be added to the Apex system
  • Plug and Play - Automatically recognized when installed into the system
  • 2 AquaBus connectors for flexible expansion via AquaBus
  • Comes with 3′ AquaBus cable
  • Galvanic Isolation for accurate and reliable probe readings
  • Led Status Indicator
  • Upgradeable firmware
  • Compatible with all Apex systems


7 Items

  • Still needs some work. By Douglas on 8/2/2017

    This probe is pretty much awesome when it works, BUT some many other devices in my setup will interfere with the readings that if I ever move my wiring it usually throws my readings off and I have to calibrate or move the probe wiring somewhere else.

    I can't really say that I trust this probe enough to ever actually believe the reading.

    I just wish they could somehow shield the cable from interference.
  • Highly recommended if you're running an APEX! By FLSharkvictim on 7/24/2017

    I am not sure the two bad reviews about the PM2 module but it's my favorite. I have a second PH, and a salinity probe. In order for it to work the proper way, you have to calibrate it and clean the probes with two part every 3 months. If you don't well then it might leave a review like the two above. My Salinity monitor probe is dead on to what my refractometer reads. I am getting ready to buy a 2nd PM2 mod for my saltwater mixing station.
  • Probe Stopped Working By Jason on 1/16/2017

    While expensive for the module and probe it is nice to have a read out of the saltwater status. Can setup an alert if the reading goes outside your defined range. Probe stopped working after about a year.
  • Not accurate By Robert on 4/22/2015

    A waste of money. Is never accurate according to my refractometer. Don't waste your money.
  • Very easy to set up had it set up within 5 minutes By Dbrown3 on 3/15/2015

    Very easy to set up had it set up within 5 minutes
  • Easy to Setup By Franklyn on 12/17/2014

    It was easy to setup. Had it up and running within minutes
  • Just Buy it By Vanore on 9/13/2013

    If you are 2nd guessing the PM2, don't. Just buy it
    The conductivity reading from this module is dead accurate, and has a very fast refresh interval. This is a must have for the "control freak" the conductivity data graphs alone will shock the non ATO system keepers. Which now happens to be next on my list.


Ask a question

Product Questions

Hi do I need any other probe or equipment to measure the salinity, using that Salinity Module: PM2 - Neptune Systems
Question by: sebastian on Apr 10, 2014 8:59:00 AM
Hi Sebastian,
This is the probe module for measuring salinity but make sure to also pick up the actual salinity probe as well!
Answer by: Bulk Reef Supply on Apr 10, 2014 8:59:00 AM
If I buy this and the salinity probe is that all I need for it to tell me the salinity or do I also have to buy something else for it to work.
Question by: Kevin Haynes on Dec 27, 2016 9:08:00 PM
Great question! As long as you have a Neptune Apex, those two items will be all you need! Although, you may want to get a few extra salinity calibration solutions. :-)
Answer by: Randy (Admin) on Jan 2, 2017 7:27:00 AM
How does an ATO float switch attach to this module?
I do not see in the photo the inputs to attach the float switches.
I am wanting to use it for both an ATO and salinity monitor.
Question by: Jeff With on Jan 14, 2016 1:04:00 PM
Great question,
There is not an option to plug in float switches directly to the PM2. If you are looking for float switches you will need the Apex Breakout Box. The breakout box can plug into the I/O port on the PM2 or the apex main module. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Jan 14, 2016 5:06:00 PM
What is the warranty on this module?
Question by: Jim on Jan 16, 2016 7:58:00 AM
Great question!
The modules for Apex will carry a 1 year warranty. I have included the warranty information on the Neptune site below. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Jan 26, 2016 5:20:00 PM
Hi can i hook up two salinity probes or i have to buy 2 modules?
Question by: Jayson on May 5, 2014 6:29:00 AM
Hi Jayson,
If you wanted to monitor two salinity probes you would need a module for each probe (so 2 in this situation).
Answer by: Bulk Reef Supply on May 5, 2014 6:29:00 AM
Does it come with the slainity probe?
Question by: Jack on Apr 2, 2014 12:44:00 PM
Hi Jack,
The salinity probe itself is sold separately.
Answer by: Bulk Reef Supply on Apr 2, 2014 12:44:00 PM