Supported Applications
The Omega LD620 series comprises rugged LVDT linear position sensors designed for displacement measurement in industrial automation and control environments. These transducers feature a guided core design with removable springs, providing frictionless operation suitable for applications requiring precise stroke monitoring.
• Displacement sensing across bi-directional (±) or uni-directional (0 to X) ranges
• Motion tracking where IP67 environmental sealing is required
Operating Conditions & Performance
The LD620 series operates within an ambient temperature range of 0 °C to +65°C (32 to 149°F). Storage conditions are specified as -20 to 85°C (-4 to 185°F). The sensors deliver a linearity performance of <0.2% FSO with an output ripple of 0.2% FSO and a bandwidth of 500 Hz (-3 dB).
• Excitation Voltage: 10 to 30 Vdc @ 25 mA maximum
• Vibration Rating (Sinusoidal Frequency): 10 to 50 Hz at 1 to 10 g rms linear amplitude; 50 Hz to 1 kHz at 10 g rms amplitude
• Shock Resistance: Drop Testing of 1 m (3') onto hard surface; Topple Testing of 10 times each end onto hard surface
Configuration Options
The series is configured with a stainless steel body and offers specific dimensional, electrical, and mechanical options to match installation requirements.
Housing and Construction
• Case Material: 300 SS (Stainless Steel)
• Diameter: 19.00 mm (0.75 in)
• Sealing: IP67 environmental rating
• Cable: PFA, 2 m (6') long cable with wiring code RED = +EXC, BLUE = -EXC, YELLOW = +SIG, GREEN = -SIG
Measurement Ranges and Outputs
The series supports travel lengths from ±2.5 mm to ±150 mm for bi-directional models (LD620) and 0 to 5 mm up to 0 to 300 mm for uni-directional models (LD621). Output signals are fixed by model family:
• LD620 Models: ±5 Vdc output
• LD621 Models: 0 to 10 Vdc output
Mechanical Options and Accessories
• Process Connection: M6 x 1.0-6g full thread
• Core Material: Nickel-iron
• Tip Adaptor/Ball Tip (Model LD-TIP)
• U-joint Retro Fit Kit (Model LD-UJOINT-KIT)
Key Product Differences
The primary distinction within the series is between the LD620 and LD621 model families, defined by their output signal type and measurement range orientation. The LD620 models provide a bi-directional ±5 Vdc output corresponding to ranges such as ±2.5 mm through ±150 mm. Conversely, the LD621 models deliver a uni-directional 0 to 10 Vdc output for ranges starting at 0 to 5 mm and extending up to 0 to 300 mm.
Physical dimensions vary by range selection; body length (Dimension A) spans from 94.0 mm (3.7 in) for the smallest travel models to 450.9 mm (17.8 in) for the largest, while fully extended length (Dimension B) ranges from 35.3 mm (1.4 in) to 457.3 mm (18.0 in). The series carries a CE mark and includes a 1 YEAR WARRANTY.
- Being replaced by the new LD600A series
- Better Than 0.2% Linearity
- 5 to 150 mm Total Travel Lengths Available
- Rugged 19 mm Dia. Stainless Steel Body
| Additional Features 1 | Wet and Corrsoive Enviornment |
| Bandwidth | 500 Hz (-3 dB) |
| Cable Length | 2 m |
| Cable Type | PFA |
| Core Material | Nickel-iron |
| Enclosure Ratings | IP67 |
| Housing Material | 300 Series Stainless Steel |
| Operating Temperature, Max | 65 °C |
| Operating Temperature, Min | 0 °C |
| Output Ripple | 0.0002 |
| Series ID | LD620 |
| Shock | Drop Testing: 1 m (3') onto hard surface;Topple Testing: 10 times each end onto hard surface |
| Storage Temperature, Max | 85 °C |
| Storage Temperature, Min | -20 °C |
| Supply Current | 25 mA |
| Vibration | 10 to 50 Hz: 1 to 10 g rms linear amplitude;50 Hz to 1 kHz: 10 g rms amplitude |