Supported Applications
The Omega DRST-AC series comprises universal AC/DC transmitters designed for DIN rail mounting in industrial and factory automation applications. These devices provide signal conditioning for hazardous electric voltages, converting high-voltage inputs into standardized process signals.
Operating Conditions & Performance
The transmitter is engineered to operate within an ambient temperature range of -20°C to +60°C with a maximum relative humidity of 95% RH (non-condensing). The unit features double insulation and carries UL Listed and CE Mark approvals. It must be installed in environments meeting pollution degree 2 or better.
Input capabilities cover hazardous electric voltages ranging from 75 to 1500 VDC and 50 to 1000 VAC, with specific measurement ranges including 0-1000 VAC, 0-1000 VDC, or a universal 0-1000 VAC/VDC configuration. The device requires a power supply of 24 VDC (±10%). For current outputs, the minimum load resistance is specified as 500 Ω for 4-20 mA output.
Mounting and Physical Specifications
• Housing Material: Plastic enclosure with an IP20 rating.
• Dimensions: 110 mm (H) x 75 mm (W) x 100 mm (D).
• Mounting Standard: DIN rail according to DIN EN 60715.
• Electrical Connection: Screw terminals.
Configuration Options
The DRST-AC series is configurable via a model number guide following the structure: DRST-AC - <Input Type> - <Output Type> - <Power Supply> - <Options>. The series supports various input types, output signals, and optional interfaces to accommodate specific monitoring needs.
Configurable Options
• Input Types:
• VAC: AC Voltage Input
• VDC: DC Voltage Input
• VAC/VDC: Universal AC/DC Voltage Input
• Output Signals:
• 4-20 mA Output (code: 4-20mA)
• 0-20 mA Output (code: 0-20mA)
• 0-10 V Output (code: 0-10V)
• 0-5 V Output (code: 0-5V)
• Power Supply:
• 24 VDC Power Supply (code: 24VDC)
• Options and Accessories:
• DRSL-DISPLAY: Detachable display for local monitoring and programming.
• CM: Remote Operator Interface (ROI) providing Modbus/RTU and Wi-Fi connectivity.
Key Product Differences
Variation within the series is defined by the selected input type, output signal range, power supply configuration, and optional interfaces. The device contains no DIP-switches or jumpers; configuration relies on the detachable DRSL-DISPLAY for local monitoring and programming.
Important operational constraints include a maximum hazardous fuse size of 10 A. Users must not open the front plate to avoid damaging the connector for the DRSL-DISPLAY, and repair or replacement of circuit breakers is restricted to Omega A/S only.
| Approvals | UL, RoHS |
| Approvals Note | EMC: 2014/30/EU, LVD: 2014/35/EU, RoHS: 2011/65/EU, UL: UL 508 / C22.2 no. 14, NB: For custom configurable signal ranges, general accuracy and EMC specifications are 0.3% of full sc |
| Calibration Temperature, Max | 28 °C |
| Calibration Temperature, Min | 20 °C |
| CMRR | 0.02 ppm/VHz |
| Display Type | Programmer |
| Electrical Output | 0 to 23 mA |
| EMC Immunity Note | NAMUR NE 21, A Criterion, Burst: <±1% of span (span = selected input range) |
| Enclosure Ratings | IP20 |
| Height | 109 mm |
| Installation | Pollution degree 2 and measurement/overvoltage category II |
| Isolation | 2.3 kVac |
| Length | 104 mm |
| Load Resistance | Current Output: ≤ 800 Ω, Voltage Output: 500 kΩ |
| Mounting | DIN Rail 35 mm Standard, EN 60715 |
| Noise Calibration | >60 dB |
| Operating Temperature, Max | 60 °C |
| Operating Temperature, Min | -20 °C |
| Power Consumption | max 1.8 W |
| Power Dissipation | ≤ 2.5 W |
| Relative Humidity | <95% RH |
| Screw Terminal Torque | 0.5 Nm |
| Series ID | DRST-AC-Srs-Sig-Cond |
| Signal Dynamics Input | 20 bit |
| Signal Dynamics Output | 18 bit |
| Stability | Load Stability: ≤0.01% of span/100 Ω |
| Supply Power Type | AC/DC |
| Vibration | IEC 60068-2-6 |
| Vibration Note | 2 to 13.2 Hz: ±1 mm;13.2 to 100 Hz: ±0.7 g |
| Weight | 250 g |
| Width | 23.5 mm |
| Wire Gauge | 26 to 14 AWG |