Yokogawa AAI135

Hanhui Guan Company has specially prepared a basic type component for overseas process control engineers in this occasion - the Yokogawa AAI135 analog input module, which is widely used in the signal acquisition process. When dealing with DCS system signals in daily work, the most common problem is that the signals sent back by on-site sensors are unstable, or data jumps randomly due to grounding issues. As a professional industrial spare parts service provider in China, Hanhui Guan Company recommends this classic input card from the Yokogawa Centum system to everyone, in order to ensure that your control system can accurately collect the 4-20mA current signals from the site, filter out all those interfering factors, and always display reliable and accurate values in the control room.

Characteristics

When holding this Yokogawa AAI135 module in your hand, the first impression is "standard" and "durable". It adopts the classic card-panel design of Yokogawa, with the casing made of a very tough engineering plastic. The color is a stable module color, and when inserted into the cabinet, it looks very harmonious. The layout of the indicator lights on the front panel is very reasonable. When it's running normally, you can tell if it's working properly just by looking at the green light. If the red light is on, it means there's a channel failure or a break in the connection. This intuitive display is extremely important for on-site maintenance. Its size is also well-designed, neither taking up too much space nor leaving insufficient space for heat dissipation. It just feels very reassuring.

Structure

This Yokogawa AAI135 integrates a highly accurate A/D conversion circuit. The most crucial aspect is its input channel design, which is grouped and isolated. This is similar to dividing the signals into several groups, with no interference between the groups. The advantage of this design is that it not only ensures safety by preventing a high voltage from entering and damaging the entire board, but also controls the cost. The components on the circuit board are neatly arranged, the solder joints are full, the gold pins on the back are very shiny, ensuring the continuity of signal transmission when inserted into the baseboard, and the structure is very solid.

Parameters

Product Model	Yokogawa AAI135
Product Series	Centum VP / CS 3000
Number of Channels	16 Channels
Input Type	Analog Input (Current/Voltage)
Input Signal	1-5V DC, 4-20mA DC
Isolation Method	Channel-to-Channel Isolation
Input Impedance	1MΩ (Voltage Input), 250Ω (Current Input)
Accuracy	±0.1% (Full Scale)
Scan Time	Approx. 50 ms (All Channels)

Company Strengths

Hanhui Guan Company has been supplying Yokogawa DCS spare parts for many years. Our greatest advantage lies in our expertise in "signal consistency testing" and "aging screening". There are some disassembled components on the market that seem to have working lights, but after being used for many years, the capacitors may have aged, causing significant reading deviations. We are different. Every AAI135 we receive is brought back, and our engineers will power it on and input signals through each channel using a standard signal source to check if the readings are within the error range and to inspect if any channels are damaged. What we aim to do is to provide you with reliable products that offer "accurate readings and good linearity".