DRST-UR DIN Rail Universal Programmable Signal Conditioner w/Relay Output
Universal Signal Transmitter with 2 Relay Output
Supported Applications
The Omega DRST-UR is a DIN rail universal programmable signal conditioner and transmitter designed for industrial process automation. It accepts inputs from RTDs, thermocouples (TC), linear resistance sensors, potentiometers, current loops, and voltage signals to condition them into standardized outputs or relay actions.
Engineers deploy the DRST-UR in applications requiring:
• Signal conversion for temperature measurement using Pt10...Pt1000 (IEC 60751), Ni50...Ni1000 (DIN 43760), Cu10...Cu100, and thermocouple types B, E, J, K, L, N, R, S, T, U, W3, W5, and LR.
• Process monitoring with programmable setpoint or window relay outputs for alarm indication.
• Safety-critical installations designed according to strict safety requirements suitable for SIL 2 applications (IEC 61508).
• Hazardous location environments certified under FM Ex / I.S. Class I, Div. 2, Group A, B, C, D; Class I, Div. 2, Group IIC; and Zone 2.
• Marine applications approved by Det Norske Veritas (Ships & Offshore Standard for Certification No. 2.4).
Operating Conditions & Performance
The DRST-UR operates within an ambient temperature range of -20°C to +60°C, with a calibration reference at 20...28°C and relative humidity < 95% RH (non-condensing). The device features IP20 protection and is designed for vibration resistance per IEC 60068-2-6 : 2007.
Performance specifications include:
• Absolute Accuracy: ≤ ±0.1% of span (general value, all input types) with a temperature coefficient ≤ ±0.01% of span/°C.
• Basic Accuracy by Input Type: mA ≤ ±4 µA; Volt ≤ ±20 µV; Pt100 ≤ ±0.2°C; Linear resistance and Potentiometer ≤ ±0.1 Ω; TC E/J/K/L/N/T/U ≤ ±1°C; TC R/S/W3/W5/LR ≤ ±2°C; TC B (85...200°C) ≤ ±4°C; TC B (200...1820°C) ≤ ±2°C.
• Response Time: Temperature input ≤ 1 s (0...90%, 100...10%); mA / V input ≤ 400 ms.
• EMC Immunity Influence: < ±0.5% of span; extended EMC immunity NAMUR NE 21, A criterion, burst < ±1% of span.
The unit provides 4-port galvanic isolation with a test voltage of 2.3 kVAC and operational isolation of 250 VAC.
Configuration Options
The DRST-UR series supports extensive configuration options for inputs, outputs, and communication interfaces to accommodate diverse process requirements without requiring multiple hardware platforms.
Input Configurations
• RTD: Supports Pt10...Pt1000 (-200°C to +850°C), Ni50...Ni1000 (-60°C to +250°C), and Cu10...Cu100 (-200°C to +260°C). Includes sensor error detection, short circuit detection (< 15 Ω), and support for 3- or 4-wire connections.
• Thermocouple: Covers types B (0°C to +1820°C), E (-100°C to +1000°C), J (-100°C to +1200°C), K (-180°C to +1372°C), L, N, R, S, T, U, W3 (0°C to +2300°C), W5 (0°C to +2300°C), and LR. Features internal or external cold junction compensation (CJC) via connector 5910.
• Electrical: Linear resistance (0 Ω to 10,000 Ω), Potentiometer (10 Ω to 100 kΩ), Current input (programmable 0...20 mA or 4...20 mA), and Voltage input (programmable ranges including 0...1 VDC, 0...5 VDC, 0...10 VDC).
Output & Relay Functions
• Analog Output: Programmable current output (0...20 mA span; ranges include 4...20 / 20...0 / 20...4 mA) with a max load of 800 Ω at 16 VDC. Voltage output available in the 0...10 VDC range with programmable spans.
• Relay Outputs: Two relays rated for max. 250 VRMS, 2 A / AC or 1 A / DC (max. 500 VA). Configurable functions include Setpoint, Window, Sensor error, Latch, Power, and Off.
• Error Handling: Supports NAMUR NE 43 upscale/downscale signaling (23 mA / 3.5 mA) for sensor faults.
Housing & Mounting
The device mounts on a DIN rail per SYSTEM 4000, DIN 46277 standards with overall dimensions of 109 x 23.5 x 104 mm (HxBxD). Dimensions increase to 109 x 23.5 x 116/131 mm when equipped with the DRSL-DISPLAY or DRST-CM accessories.
Key Product Differences
The core model is identified as DRST-UR. Functional variations are achieved through configuration rather than distinct hardware SKUs, supported by optional accessories:
• DRSL-DISPLAY: A removable display and programming front that provides an LCD with 4 lines. It enables process calibration, signal simulation, relay simulation, password protection, error diagnostics, and help text in multiple languages. The unit can copy configuration from one DRST-UR to subsequent transmitters.
• DRST-CM: A communication enabler for data exchange capabilities.
• CJC Connector 5910: An external sensor connector (ordered separately) used for cold junction compensation in thermocouple applications, offering improved accuracy over internal CJC sensors when ambient temperatures deviate from the calibration range.
The series supports a universal power supply of 21.6...253 VAC (50...60 Hz) or 19.2...300 VDC with max consumption ≤ 2.5 W and an internal fuse rated at 400 mA SB / 250 VAC
| Accuracy | ± 0.1 % |
| Approvals | UL: UL 508/C22.2 no. 14; DNV-GL Marine Stand. f. Certific. No. 2.4; EU RO Mutual Recognition Type; Approval: MRA000000Z SIL Hardware assessed for use in SIL applications; Authority Requirements:EMC: 2014/30/EU, LVD: 2014/35/EU, EAC: TR-CU 020/2011 |
| Calibration Temperature, Max | 28 °C |
| Calibration Temperature, Min | 20 °C |
| Cold Junction Compensation | 20 to 28°C = ±1°C, -20 to 20°C/28 to 70°C = 2°C |
| Electrical Output | 0 to 20 mA, 0 to 10 Vdc |
| EMC Immunity Note | Standard EMC Imunity: <±0.5% of span; Extended EMC Immunity: NAMUR, NE21, A Criterion, Burst: <±1% of span; Wire Size: 1 x 2.5 mm² |
| Enclosure Ratings | IP20 |
| Fuse Rating | 250 Vac/400 mA |
| Height | 109 mm |
| Input Control Signal | 0 to 12 Vdc |
| Input Control Signal Note | Measurement Range: 0 to 12 Vdc; Programmable Measurement Ranges: 0/0.2 to 1, 0/1 to 5, 0/2 to 10 Vdc |
| Input Current | 0 to 20 mA |
| Input_Current Note | Programmable Measurement Ranges: 0 to 20 and 4 to 20 mA; Input Resistance: Nom. 20 Ω + PTC 50 Ω Sensor Error Detection: Loop; Break 4 to 20 mA: Yes |
| Input Resistance | Voltage : Nom. 10 MΩ,Current: Nom. 20 Ω + PTC 50 Ω |
| Isolation | Test/Working: 2.3 kVac/250Vac |
| Length | 104 mm |
| Operating Temperature, Max | 60 °C |
| Operating Temperature, Min | -20 °C |
| Output Detail | Signal Range: 0 to 20 mA; Programmable Signal Ranges: 0 to 20/4 to 20/20 to 0/20 to 4 mA; NAMUR NE43 Upscale/Downscale: 23 mA/3.5 mA; Output Limitation, on 4 to 20 and 20 to 4 mA signals: 3.8 to 20.5 mA; Output Limitation, on 0 to 20 and 20 to 0 mA signals: 0 to 20.5 mA; Signal Range: 0 to 10 Vdc; Programmable Signal Ranges: 0/0.2 to 1; 0/1 to 5 ; 0/2 to 10; 1 to 0.2/0; 5 to 1/0; 10 to 2/0 V |
| Output Signal | Current, Voltage, 2 Relays |
| Potentiometer Input Range | 10 to 100 kΩ |
| Power Consumption | 2.5 W |
| Relative Humidity | < 95% RH Non-Condensing |
| Relay Output | 2 A @ 250 Vac |
| Relay Output Note | Relay Functions: Setpoint, Window, Sensor error, Latch, Power and Off |
| Response Time | 1 sec |
| Response Time Note | Thermocouple: 1 sec, Current/Voltage: 400msec |
| RTD Input Note | Effect of Sensor Cable Resistance: < 0.002 Ω/Ω (3/4-wire); Cable Resistance, Per Wire: 50 Ω; Sensor Current: 0.2 mA; Short Circuit Protection: < 15 Ω; Sensor Error Current: 2 µA / 0 µA |
| RTD Type | 10/20/50/100/200/250/300/400/500/1000 Ω Pt Sensor, 50/100/120/1000 Ω Ni Sensor, 10/20/50/100 Ω Cu Sensor |
| Screw Terminal Torque | 0.5 Nm |
| Sensor/Transmitter Power | 25 to 16 Vdc/0 to 20 mA |
| Series ID | DRST-UR-Univ-Sig-Cond |
| Signal/Noise Ratio | > 60 dB |
| Storage Temperature, Max | 85 °C |
| Storage Temperature, Min | -20 °C |
| Supply Power Note | 21.6 to 253 Vac, 50 to 60 Hz or 19.2 to 300 Vdc |
| Supply Power Type | AC/DC |
| Supply Voltage | 21.6 to 253 Vac, 19.2 to 300 Vdc |
| Temperature Coefficient | ≤±0.01% of span/°C |
| Temperature Measurement Range | J: -100 to 1200°C, K: -180 to 1370 °C, T: -200 to 400 °C, E: -100 to 1000 °C, R: -50 to 1760 °C, S: -50 to 1760 °C, N: -180 to 1300 °C, B: 0 to 1820 °C, W3: 0 to 2300 °C, W5: 0 to 2300 °C, L: -200 to 900 °C, LR: -200 to 800 °C, RTD: -200 to 850 °C |
| Thermocouple Type | J, K, T, E, N, R, S, U, B, G, C, D, L, LR |
| Vibration | ±0.7 g |
| Vibration Note | IEC 60068-2-6; 2 to 13.2 Hz: ±1 mm; 13.2 to 100 Hz: ±0.7 g |
| Weight | 170 g |
| Width | 23.5 mm |
| Wire Type | Stranded |