A Safe Way In Automation
MD-RT1
RTD Temperature Intrinsic Safety Barrier (1-Channel)
The MD-RT isolated barrier is designed to measure the temperature of devices installed in hazardous areas, so as to promote intrinsic safety. This is achieved by preventing excess energy from possible faults on the safe side from reaching the hazardous area. Featuring up to three channels, it supports analog signals and can be configured with the Modbus protocol. The MD-RT1 is a 1-channel isolated barrier that also measures the temperature of 2-3-4 wire RTDs. And it supports various types of RTDs, including PT10, PT50, PT100, PT200, PT500, PT1000.
Since it is installed in a safe area, measured values in hazardous areas are transmitted back to the safe area through the MODBUS – RTU protocol, with a bit rate up to 115.2 kbps for Monitor/ Configuration. Also, loop monitoring measures faults like sensor breakages and sensor shortages of the device and warns users by fault LED.
Furthermore, the MD-RT consumes about 208 mA and 5W current. The power dissipation is less than 1W. The environmental conditions are -20 to +60 °C as an operation and -25 to +65 °C as storage temperature.
Product Features
- Support 1 Channels
- 24 VDC Supply
- Analog Signal Type
- Modbus RTU
- RS-485 Interface
- Connection with Screw Terminals
- Configurable with Modbus Protocol
- Measuring Temperature from RTDs
Technical Specifications
| GENERAL SPECIFICATION | |
| Signal Type | Analog Input |
| Number of Channels | 1 Channel |
| SUPPLY | |
| Rated Voltage | 24 VDC Nom (20-30 VDC) Reverse Polarity Protected |
| Connection | Terminal 1 PIN 1(+24 VDC), Terminal 1 PIN 2 (GND) |
| Power Dissipation | < 1 W |
| Current Consumption | Approx. 208mA |
| Max. Power Consumption | 5 W |
| INPUT | |
| Input | 2-3-4 Wire RTD |
| Connection | Terminals 2 |
| Rated Values | - |
| Integration Time | 400 ms |
| Input Range | 0-4 kΩ (RTD/res) |
| RTD | |
| RTD | (PT10,PT50,PT100,PT500,PT1000) |
| Type of Measuring | 2,3 and 4 Wire |
| Measurement Loop Monitoring | Sensor Breakage |
| Measuring RTD Current | 323 μA |
| DEVIATION | |
| RTD | Max 0.1% of Span |
| DATA CONNECTION | |
| Modbus RTU | RS-485 connection up to 115.2 kbps for Monitor/ Configuration |
| Connection | Terminal1 PIN 3 (D-), Terminal1 PIN 4 (D+) |
| ISOLATION | |
| Input / Power Supply | 1500 VDC Example. safe electrical isolation by reinforced insulation according to IEC/EN 61010^-1 Rated insulation voltage 300 Veff test voltage 3 kV, 50 Hz, 1 min. |
| ENVIRONMENTAL CONDITIONS | |
| Operation Temperature | Temperature Limits –20 to +60 °C |
| Storage Temperature | Temperature Limits –25 to +65 °C |
| MOUNTING | |
| Mounting | On 35 mm DIN Mounting Rail Acc. to EN 60715:2001 |
| APPROVALS | |
| IEC60079-0, IEC60079-11, IEC60079-15 | |
| FM & FM-C No.3024643,3029921C,conforms to Class 3600,3610,3611,3810 | |
| LOCATION | |
| Safe Area/Non Hazardous Locations or Zone 2, Group IIC T4, Class I, Division 2, Groups A, B, C, D Temperature Code T4 and Class I, Zone 2, Group IIC, IIB, IIA T4 installation | |
| SAFETY DESCRIPTION | |
| ATEX | II 1 G Ex ic [ia Ga] IIC T4 Gc, II 3 G Ex ic [ic] IIC T4 Gc, II 1 D Ex ic [ia IIIC Da] IIC Gc II 3 D Ex ic [ic IIIC Dc] IIC Gc |
| IECEx | Ex ic [ia Ga] IIC T4 Gc, Ex ic [ic] IIC T4 Gc, Ex ic [ia IIIC Da] IIC Gc, Ex ic [ic IIIC Dc] IIC Gc |
| FM | Class 1, Zone 2 AEx ic [ia Ga] IIC T4 Gc, Class I, Zone 2 AEx [ic] IIC T4 Gc Zone 20 Ex ic [ia IIIC Da] IIC Gc, Zone 2 Ex ic [ic IIIC Dc] IIC Gc |
| North American Zones | Class I, Division 2, Groups A, B, C, D T4, Class II, Division 2, Groups F, G |
| ASSOCIATED ELECTRICAL APPARATUS | |
| Vo/Voc | 17.0 V, Io/Isc = 85 mA, Po/Po = 1.45 W |
| IECEx | 24V, Ci = 6 nF, Li = 0 nH. Um = 30 V, -20 °C ≤ Ta ≤ 60°C. |
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