OSI - Model LLM-100 -Laser Level Meter
OSI`s patented Laser Level Meter (LLM) is a compact industrial sensor that utilizes an infrared laser and advanced micro-processor to measure levels in in industrial storage tanks, large commercial process bins and agricultural silos. The LLM-100 uses an eye safe pulsed infrared laser and measures distance using time of flight of a very narrow laser pulse. The sensor uses a very sensitive Avalanche Photodiode, which is coated with a bandpass filter to block out all ambient light. This enables the LLM-100 to be used indoors and outdoors on sunny days. The sensor can be used as a stand-alone sensor requiring only 12.5-36 VDC and out puts RS232 and 4-20 ma outputs or with optional control box.
The optional remote control box can accept up to 4 LLM sensors and allows the user to quickly configure each of the sensors and provides the power, display, a keypad, fault relay output and current loop connections for each of the sensors.
As with all Optical Scientific sensors, the LLM- 100 is easy to install, needs almost no maintenance, and is equipped with continuous self-diagnostics.
The LLM-100 cage houses all electronics and modules for the LLM to function.
- Micro Processor Unit - Controls laser pulse and process Receiver signal.
- Transmitter Unit - fires 20 ns laser pulses 4000 times a second.
- Receiver unit - Receives return laser beam
OSI includes a visible Pilot laser collinear with the measuring laser to help with alignment. The pilot laser can be turned off to conserve power. The sensor also comes standard with a 4-line LCD display to aid checking the data and performance of the sensor, which can also be turned off to conserve power.
- Eye safe pulsed infrared laser
- Built in algorithms to handle dust flares Heated windows
- Easy installation and optical alignment.
- Works indoors and outdoors on sunny days Long-term reliability: no moving parts;
- operates unattended - 24/ 7/365.
- Ultra-low maintenance design.
- Rugged; designed for harsh environments. Built in continuous self-test diagnostics.
- Order Z-Purge Option for Class I Div I/II applications.
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- 1910-804 Laptop DB9 serial communications cable
Performance
- Measurement Technique: Time-Of-Flight (TOF)
- Range: 1 to 100 Meters
- Accuracy (absolute): 0.01 Meters or 1% whichever is greater
- Resolution: 0.01 Meters
- Time Constants: 4000 Samples/Sec updated @ 1 sec. interval
- Diagnostics: Continuous Self Testing
Environmental
- Ambient Temperature: -40 C tO 60C
- Humidity: 0 to 100% RH Condensing
- Enclosure: NEMA4X
Physical Specifications
- Light Source: Infrared laser with visible pilot laser
- Sensor Head: 9 x 9 x 13 in15 x 15 x 14 cm
- Sensor Head Weight: 13 lb5 kg
- Control Unit Dimensions: NEMA4 Wall Mount (Optional): 12 x 14 x 8 in30 x 40 x 25 cm
- Control Unit Weight: NEMA4 Wall Mount (Optional): 15 lb7 kg
Electrical Specifications
- User Interface: RS-232 serial I/O and up to four 4-20 mA isolated current loops. Two sets of relay contacts for fault and error indication.
- Power for Sensor Head: 12-5 to 36 VDC at 0.4 AMP
- Power for Control Unit: Universal 100-240 VAC, 50/60 Hz, 40 VA (fused & surge protection)
- Cable between Control Unit and Sensor Head: 25 foot fixed (shielded, 10 cond., 22 AWG)