European Heat Tracing Experts
European Heat Tracing Experts
Operation in hazardous zones 1, 2 (21, 22)
The remote temperature measurement unit ConTrace AS-xxx-Ex is one of the components of the specialized control system for electrical heating ConTrace. Transmission of temperatures data is carried out via RS-485 (Modbus RTU). This makes possible to use the ConTrace AS-xxx-EX units as a part of third-party control systems that support this type of communication.
Using ConTrace AS-xxx-Ex units allows for centralized control and transmission values of the temperatures of remote objects, which is particularly effective for a large gathering of measurement points within a radius of 100 m. For each ConTrace AS-xxx-Ex unit, depending on the modification, up to 8 RTD temperature sensors can be connected. Incoming data from sensors are transferred to the control cabinet by means of only one cable according to the RS-485 standard. At a distance of 1 200 m, up to 16 ConTrace AS-xxx-Ex units can be connected in series. This makes it possible to monitor changes in the temperature characteristics of the electrical heating system at 128 points simultaneously.
The intrinsically safe circuit and hazardous area enclosure allow the installation of the remote temperature measurement unit ConTrace AS-xxx-Ex in zones 1 and 2 (21, 22).
| Ex marking | 1 Ex e ia m IIC T6 |
|---|---|
| Supply voltage | 90...245 VAC, 50...60 Hz |
| Power consumption, max | 5 W |
| Interface | RS-485 |
| Communication protocol | Modbus RTU |
| RS-485 interface connection | A, B, com |
| RS-485 communication speed | 9 600 ...115 200 bps. |
| Max length of the RS-485 network segment | 1200 m* |
|
Terminal blocks for connections 1. Temperature Sensors 2. Interface cable | Up to 2,5 mm2 |
| Terminal blocks for mains power connections | Up to 6 mm2 |
| Number of temperature measurement channels | 8 |
| The resolution of the ADC of the measuring channel | 23 bits |
| Type of sensors | See the table “Types of sensors” |
| Temperature measurement range | −100 ... +500 °С |
| Accuracy of measurements | 0,5 °С |
| Maximum sensor distance from the unit | 100 m |
| Sensor connection circuit | Three-wire circuit |
| Operating temperature range | −55 ... +50 °С |
| Degree of protection | IP66 |
| Dimensions (W×H×D), mm: AS-8MM-Ex AS-8PP-Ex AS-8PM-Ex AS-4PM-Ex |
340×325×215 315×290×125 380×325×125 325×325×125 |
| Weight, g: AS-8MM-Ex AS-8PP-Ex AS-8PM-Ex AS-4PM-Ex |
8,0 4,5 6,0 4,5 |
| Service life | Not less than 10 years |
* Depends on the selected data rate and the conditions for the protection of the control cable against electromagnetic interference.