Learn about the Stratos Multi transmitter for pH, ORP, conductivity and oxygen sensors and see what the box includes.

Transmitter Overview

The Multi is a 4-wire transmitter capable of taking up to two sensors for the measurements of pH, ORP, conductivity, or dissolved oxygen in any combination. It is available with Class 1 Division 2 hazardous area approval. The backlit display, along with intuitive icons and diagrams, provides clear and intelligent diagnostics for an in depth understanding of the health of your measurement loop.

What’s in the Box

Let’s take a look at what’s inside the box when you receive your Stratos Multi transmitter: Here we have our transmitter face plate, our NEMA 4X housing enclosure, an accessory bag with cable glands, plugs and a hinge pin, as well as documentation which includes an installation guide, safety instructions, and the transmitter test report. A full product manual is available electronically for download on our website.

The Stratos Multi is truly a multi parameter transmitter. This single transmitter can measure pH/ORP, conductivity, or dissolved oxygen in any combination.

Closer Look

First, let’s take a look at the back of the faceplate. You will notice that the enclosed electronics protect the circuit boards from the elements. The sensor connection is also protected from the output and power terminals. The transmitter also has a slot for an additional measuring module. You can purchase this module separately, and it allows for the connection of an additional Memosens or analog sensor. Additionally, this transmitter is able to datalog. Here you can see the USB memory card port. You can purchase this memory card separately as well.

Power Supply

Power is supplied on the main rail. The Stratos Multi utilizes a universal power supply, and can be powered anywhere from 24v CD, up to 230 VAC. A convenient feature, found in all Knick 4-wire transmitters, is that the transmitter is polarity insensitive. Therefore, you can use either terminal for the positive and negative wires.

Inputs & Outputs

The Stratos Multi provides 3 relays contacts which you can use for high and low limit detection, as well as PID control. You can also assign any of these relays to an alarm based off sensor health or dedicated to trigger an automatic wash cycle. The next terminals are for the 2 digital inputs. These inputs can monitor flow, change parameter sets within the transmitter, or place the transmitter in a “hold mode” for function checks.

The Stratos Multi also provides four 4…20mA outputs which can function as either active or passive outputs. The first analog output carries the HART protocol. Through HART, you are able to pull process and diagnostics values back to your control system. Lastly, terminals 1-5 carry our Memosens cable connection. Terminal 1 is for the brown wire, terminal 2 the green wire, terminal 3 the yellow wire, terminal 4 the white wire, and lastly, terminal 5 is for the clear or shield wire.

Connecting the Sensor

Let’s close up the transmitter and connect the power. The Stratos Multi has a bright, backlit multi-color display along with simple status icons which follow the Namur NE 107 standard. The screen will change color and icons will appear for quick indication of a change in the sensor status. The screen is now red because our sensor is disconnected. Let’s connect our sensor and see what happens.

When connecting to a Memosens sensor, the transmitter will display the sensor’s model, serial number, manufacturer, and the date and time of the last calibration. In measurement mode, the backlit display is a bright white with bold process values, and you can see the Sensoface icon as well as the measurement in the top left corner.

Keys & Menu Options

Let’s now review the buttons on the face of the transmitter. Starting with the left square is the Menu button. This button also serves as the “Back” button when within the different menu options. On the right hand side of the transmitter is a softkey button. This button can assign access to the “Favorites Menu”, change the parameter set with the transmitter, or display a rotation of the different measured values. Navigate within the different menu screens with all four arrows. Change numerical values or letters using both the up and down arrows. Finally, the Enter button is in the middle. Confirm any adjustments you make with this button.

Learn more about your transmitter and how to program it for your application by watching our next video on the Setup and Configuration of the Stratos Multi.

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