Have a look at the Protos 4400 modular transmitter from Knick and see what the box includes.

Overview

The Protos 4400 is a four-wire transmitter capable of accepting up to three different input, output, or BUS communication modules. When using Memosens digital sensors, you can simultaneously monitor up to four measurement channels. Class 1 division 2 approval is also available for use of the Protos 4400 in hazardous areas.

Base Unit Configuration

The base unit consists of our main display and keypad, which connects to the main housing that includes power and output terminals. Then, we have our test report followed by a handy installation guide and safety guide. Two different IP65 rated housing options are available: powder coated steel and polished stainless steel housing for hygienic applications. Additionally, different input and output modules are available for the Protos, which you can add via this communication interface. On back of the front faceplate, we’ll see a slot available for inserting a memory card. This can record measured data as well as perform a firmware update.

Terminals

Let’s review the terminals on our base unit from right to left. Depending upon the Protos version you have purchased, different power supplies are available. The general purpose version can be powered from 24 VDC up to 230 VAC at terminals 18 and 19 which are polarity insensitive.

First, terminals 14 through 17 are designated for connecting to ground. Next, in terminals 11 through 13 we have two digital inputs available. These inputs allow for different parameter sets or NAMUR function check activation via a control signal. Next to the digital inputs are our two active 4 to 20 mA analog outputs. These are located at terminals 7 through 10 and are labeled I1 and I2. You can also add additional outputs to your Protos by using an output extension module. Finally, rounding out the terminals on our base module are four relay contacts at terminals 1 through 6. Three of these relays are freely definable for functionality such as high and low level detection, as well as assignment for activating a wash cycle. The fourth relay at terminals 5 and 6 is serves for alarm notification.

Keypad & Display

Let’s close up the transmitter and connect the power. The Protos has a bright backlit LCD graphical display along with simple status icons which follow the NAMUR standard. On the keypad, we have three function keys and four arrows for navigation through the menu selection and data entry. We also have two soft keys at the top which are customizable for secondary displays, as well as access to the popular favorites menu. Finally, we see two LEDs for notification of alarm as well as powering on the device.

Learn more about simple programming by watching our next video on setup and configuration of the Knick Protos 4400 transmitter.