DRSL-RTD-LP Non Isolated Loop Powered DIN Rail RTD input Conditioner

Supported Applications

The Omega DRSL-RTD-LP is a non-isolated, loop-powered DIN rail signal conditioner designed to interface 2-, 3-, or 4-wire Pt100 RTD temperature sensors with SCADA systems and PLC equipment. The unit converts the sensor input into a passive analog current output signal suitable for industrial process monitoring.

Operating Conditions & Performance

The DRSL-RTD-LP operates within an ambient temperature range of -25 to 70°C (-13 to 158°F) and supports storage temperatures from -40 to 85°C (-40 to 185°F). It is rated for environments with relative humidity up to 95% RH non-condensing. The device provides an accuracy of better than 0.2°C or ±0.1% of the selected range, with a temperature coefficient of ≤±0.02°C/°C.

Performance specifications include:

• Input Range: -200 to 850°C (-328 to 1562°F)
• Sensor Current (RTD): <150 μA
• Response Time: <30 ms/300 ms (selectable, 0 to 90% / 100 to 10%)
• Signal-to-Noise Ratio: >60 dB
• EMC Immunity Influence: <±0.5% of span (Extended EMC: NAMUR NE 21, A Criterion)

The unit is designed for use in Pollution Degree 2 and Overvoltage Category II installations.

Power and Electrical Limits

• Supply Voltage: 3.3 to 35 Vdc (loop-powered)
• Voltage Drop: 3.3 Vdc
• Max Power Consumption: 1 W max (Internal: 0.65 W max)
• Load Resistance: ≤(V_supply - 3.3)/0.023 Ω
• Sensor Cable Specifications: 50Ω per wire or 50 nF
• Effect of Sensor Cable Resistance (3 or 4-Wire RTD): <0.002Ω/Ω

Configuration Options

The DRSL-RTD-LP series is configurable via DIP switches to select from over 1,000 factory-calibrated measurement ranges. The device supports programmable output signal ranges of 0 to 20 mA and 4 to 20 mA.

Input and Output Configuration

• Input Type: 2, 3, or 4-wire Pt100 RTD
• Broken Sensor Detection: >800Ω (Output: Below 3.5 mA or above 23 mA)
• Shorted Sensor Detection: <18Ω
• NAMUR NE43 Range Limits: Below 3.8 mA or above 20.5 mA
• Error Identification: Incorrect DIP-switch settings trigger output levels below 3.5 mA or above 23 mA.
• Output Error Level: Selectable for upscale or downscale via DIP switch.

Mechanical and Environmental Features

• Housing Protection Degree: IP20
• DIN Rail Type: DIN EN 60715 - 35 mm (requires enclosure for live part protection)
• Dimensions: 113 H x 6.1 W x 115 mm D (4.4 x 0.24 x 4.5")
• Weight: Approx. 70 g (0.15 lb)
• Wire Size: 0.13 to 2.5 mm² / AWG 26 to 12 stranded wire
• Screw Terminal Torque: 0.5 Nm

Key Product Differences

The DRSL-RTD-LP is a specific model within the broader DRS-L family of signal conditioners, distinguished by its loop-powered architecture and non-isolated design for Pt100 RTD inputs. Unlike isolated variants (e.g., DRS-L-RTD-ISO) or thermocouple models in the same manual scope, this unit is powered directly from the host output current signal loop.

Available accessories include:

• RAIL-35-1: 35 mm (1.4") DIN rail, 1 m (3.3') length
• DRSL-MOD-STOP: Module stop screwed onto the DIN rail to support and hold mounted devices.