Monitor aquarium salinity in real-time with this simple upgrade to your AquaController Apex Controller System. Neptune Systems AquaController Apex PM2 Salinity Module expands the monitoring and control capabilities of your Apex system by adding conductivity and temperature probe ports. Six additional I/O switch inputs are great for ATO, feed buttons, float switches, water sensors, flow sensors and more!
Neptune Systems AquaController Apex PM2 Salinity Module is an invaluable expansion option for reef-keepers or any hobbyists with a saltwater aquarium. Provides 4 measurement ranges (0-900 µS/cm, 0-9.0 mS/cm, 0-90.0 mS/cm, 0-50 ppt) to suit hobbyist preference.
Connect a Neptune Systems AquaController Apex Temperature Probe (sold separately) to the additional temperature port on the PM2 Salinity Module and set the temperature compensation to experience the most accurate real-time salinity measurement possible!
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The AquaController Probe Module 2 should be securely mounted in a location free from moisture. Use wood screws through the mounting tabs of the probe module case or if mounting on drywall, use drywall anchors (mounting hardware not included).
WARNING: Water damage will void your warranty! Mount all modules in locations safe from moisture exposure.
WARNING: NEVER plug standard USB devices into any AquaBus connector or AquaBus accessories into computer USB ports. Damage to the AquaBus accessory and/or USB device may result.
Connect the Conductivity Probe (must be purchased separately, available from your Neptune retailer) to the port labeled Conductivity on the Probe Module 2. Push the Mini-DIN connector into position paying close attention to the pin alignment.
If you are using a temperature probe with the Probe Module 2 (must be purchased separately, available from your Neptune retailer), plug in to the port labeled Temp on the Probe Module and place the other end of the Temperature Probe in the aquarium water in an area of medium to high flow in the same area as the conductivity probe.
Verify the Installation
Update Probe Module Firmware
To check or update an Apex module firmware:
Conductivity Probe Setup
NOTE: When the conductivity range is in salinity mode, the probe is still actually reading the conductivity of the water. Since the ratio of ions in saltwater is very well defined, there is a direct correlation between the conductivity of the water and the salinity of the tank.
NOTE: If the conductivity range is changed, don't forget to update outlet programs that are based on the conductivity reading as the values will change with the change in range.
WARNING: Temperature compensation value MUST be set to 0.0 if no temperature probe is attached to the PM2.
To set the Temperature Compensation:
NOTE: Leave the Temperature Compensation set to 0.0 if you are not using temperature compensation or do not have a temperature probe attached to the PM2. Other temperature probes on the system cannot be used for temperature compensation of the conductivity probe.
Conductivity Probe Calibration
To calibrate a Conductivity probe:
NOTE: Many conductivity calibration solutions do not have the same ionic composition as saltwater, so using a refractometer to measure the salinity of the calibration solution is not valid. For example, the Neptune 53.0 mS/cm conductivity calibration standard will not have a salinity of 35 PPT or a specific gravity of 1.0259.
Conductivity Probe Maintenance
WARNING: Do not apply voltage to the switch inputs or damage to the AquaController Apex may occur.
Connect switches to the AquaController Apex by connecting one wire from the mechanical switch to the ground pin (pin 8), and the other wire from the switch to one of the six digital inputs (pin 1-6). Connections can be easily made using a Neptune I/O Breakout box available at your local Neptune Retailer. The breakout box features spring-loaded connectors to make connections easy without tools or soldering.
The Apex and accessory inputs are TTL level (5V) inputs with internal pull-up resistors. With nothing connected, the switch inputs will indicate OPEN (Logic 1-5V). When connected to Ground (Pin 8), the switch will indicate CLOSED (Logic 0-0V).
Switch Inputs are programmed using the If Switch command. For example, if you wanted to turn a pump on when a float switch closes, you would add this command to the pump outlet program:
If Switch1 CLOSED Then ON
See the section titled Appendix 3 -Programming Reference and Appendix 4-Advanced Programming Examples in the Apex Setup and Programming Guide for more information.
If a temperature probe is connected to the PM2, it is identified as "Tmpx3", "Tmpx4", etc. with the same AquaBus number as the pH/ORP probe.
Switch inputs connected to probe modules will be identified as Switchx3_2, Switchx5_3, etc. The first number in the switch name corresponds to the AquaBus address assigned to the probe module. The second number corresponds to the switch input number (1-6).
NOTE: The conductivity reading can be added to the Apex Display and Web Interface Status Screens. See the section titled Display Setup in the Apex Setup and Programming Guide for more information.
The following are some valid program statements (assumes that probe module is installed and configured on AquaBus address 4).
If Tmpx4 > 80.0 Then ON
Please see the Programming Outlets section of the Apex Setup and Programming Guide for more information on programming the AquaController Apex.