Learn about the 4…20 mA version of the MemoRail transmitter for Memosens sensors and get an overview of its terminal blocks, DIP-Switches, and LED lights.

MemoRail Overview

We are going to review the 4…20 mA version of the Knick MemoRail transmitter. The MemoRail is a compact, DIN rail mounted transmitter for use with pH, ORP, conductivity, and oxygen Memosens sensors. This transmitter provides tremendous space savings and the full benefit of the Memosens digital communication between the connected sensor and the transmitter.

What’s in the Box

Let’s have a look at the transmitter and review its benefits. Inside the box you will find, of course, your MemoRail Transmitter, a test certificate, a detailed manual including product specifications, as well as a wiring diagram. This DIN rail mounted transmitter is multi-parameter and has the ability to take in Memosens pH, ORP, conductivity, or an oxygen sensor in a single channel format.

Terminals

Next, let’s review the terminals along the top and bottom of the transmitter. The MemoRail is a 4-wire device and can be powered by 24 volts DC directly at terminals 1.1 and 1.2 along the top of the transmitter. Alternatively it can be powered by a DIN rail BUS connector, which you can buy separately. AC power from 90 to 230 volts can also power the device directly at the main terminals. Next, there are two 4…20 mA analog outputs available in either an active or passive format. These are on terminals 2.1, 2.2, and 3.1, 3.2. The 4…20 mA outputs can be spanned by setting the DIP switches on the face of the transmitter.

Printed on the side of the transmitter and also in the manual, you will see the available options for the measurement and outputs configurations. The terminals to wire your Memosens sensor are located at the bottom of the transmitter. Terminal 4.1 is for green Memosens wire, 4.2 the yellow wire, 5.1 the brown wire, 5.2 – white. Finally 6.1 or 6.2 is the shield or the clear wire. You can remove these terminal blocks for ease of wiring.

LED Indicators

Lastly, a convenient set of LED lights are located on the front of your transmitter. These indicate the status of your measurement loop. A solid green indicates that all is well. A solid red indicates device failure, meanwhile a blinking red indicates a need for maintenance. And finally, a solid red and solid green lights indicates a failure message, such as DIP switch position does not match the connected sensor.

The MemoRail compact digital transmitter provides seamless integration into OEM systems and areas of installation with limited space. Please check out our additional videos on the MemoRail transmitters to familiarize yourself further with setup, configuration, calibration, and troubleshooting with the device.

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