Learn how to quickly set up and configure your Stratos Multi transmitter for pH, ORP, conductivity, and oxygen sensors.

Before Configuration

Before you begin, make sure you connect your power supply, sensor cables, and any outputs you are utilizing to the terminal box on the back of the transmitter. After applying power, you will notice that we currently have an error icon and the screen is red. This is because we have not yet configured the transmitter for our Memosens sensors. We’ll be configuring this Stratos Multi for dual-channel Memosens pH & conductivity measurements.

Parameter Setting

Let’s start by entering the operator level of the parameter setting menu. First, press the Menu button and then toggle to the right to Parameter Setting. After pressing Enter scroll down to Operator Level and press Enter to go into the menu. If prompted for a postcode here, please note that the default is 1-2-4-6. The first menu we will configure is our General operation menu. Within this menu we can select the Displayed Language, our desired Units Formats – such as degrees Fahrenheit and PSI, and our Displayed Measured Values for the main screen.

If you have purchased the option for the measurement recorder, you can configure it within this menu as well. We will select our desired units of measurement, as well as our displayed values on the main screen. The left square button will take us back to the main Parameter Setting menu.

Output & Relay Configuration

Now, let’s configure the 4…20 mA outputs and the relays from the device. If utilizing any digital inputs for flow control or placing the transmitter in hold mode, they can also be configured within this menu. Scroll down to Inputs/Outputs and press Enter. For this transmitter we will configure two 4…20 mA outputs – one for pH and one for conductivity, as well as one high level pH relay. The output can be turned off if not in use. We will turn output 1 on and configure it for a pH value from 3 pH to 10.

Lastly, we can define the milliamp output of the device when in failure mode to be either 3.6 mA or 22 mA. Do this in the Behavior During Messages folder. Let’s back out of Output 1 and continue configuring Output 2 for conductivity from 0 μS to 500 μS. Next, we will set up our relay contact K1 for a high limit value of nine pH. As you can see, we can define our hysteresis, the normal state of the contact, as well as any on/off timing delays for the relay.

Sensor Selection

Once the inputs and outputs are configured, we can then move on to our Sensor Selection Outputs that are found in the Main Parameter Settings menu. The Stratos Multi is capable of taking in up to 2 sensor inputs with the installation of an additional measuring module. By pressing Enter on Sensor Selection we can configure our process variables for both channel 1 and channel 2. Because both of our sensors are Memosens sensors, we will select Auto Recognition for the process variables. Lastly we want to ensure the Calibration Settings are set up for both our Memosens pH and conductivity sensors. To do this, we will first set up our pH Calibration Settings by selecting Channel 1 Memosens pH in Parameter Settings.

Cal Presettings

Here we will scroll to Cal Presettings and press Enter. We recommend Calmatic, or automatic calibration, which provides buffer recognition and temp compensation automatically. Once you have selected Calmatic under Calibration Mode, it then offers us the ability to select which buffer set we are using. The most common buffer set on the market is NIST technical. You can verify the buffers you are using by the labeling on your bottles. Next, we can select our default number of calibration points, followed by the Drift Check of the sensor.

Lastly under Cal Presettings, the Calibration Timer allows us to set either a fixed interval or an adaptive evaluation based off sensor loads for indication that a calibration is needed. Please remember that these are default calibration settings which we are configuring. The operator can always change these settings at the beginning of any calibration procedure in the Cal Menu. We’ll repeat the process for the conductivity sensor on channel 2, this time selecting Manual for the Cal Mode.

HART Communication

The final step of configuring the Stratos Multi transmitter is setting up the HART communication protocol. If utilizing HART communication to your control system, you have the capability of not only selecting the main process values but also the Memosens diagnostic values. For our setup we will enable the Sensoface status for our pH and conductivity sensors on the second and third HART values. This will ensure continuous feedback to our control system on the health of our measurement loops.

This rounds out setup and configuration of our Stratos Multi transmitter. We’re now ready to return to Measurement Mode by pressing the right square button and go online.

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