model lm-sd standard distance laser meter ... - logika...

Model LM-SD Standard Distance Laser Meter

Operator’s Manual

Version 11-2010

Logika Technologies Inc. Model LM-SD Operator’s Manual Rev. 11-2010

Web: www.logikatech.com Phone: 905-829-5841 Fax: 905-829-8787 Email: [email protected]

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Contents

1. Introduction ........................................................................................................................... 2

2. Description ............................................................................................................................ 3

2.1 Model Nomenclature ...................................................................................................... 3

2.2 Specifications ................................................................................................................... 3

2.3 Operating Principle .......................................................................................................... 4

3. Location and Mounting ......................................................................................................... 4

3.1 Sensor Location ............................................................................................................... 4

3.2 Sensor Mounting ............................................................................................................. 6

4. Utility Connections ............................................................................................................... 7

4.1 Electrical Connections ..................................................................................................... 7

4.2 Plumbing Connection .................................................................................................... 10

4.3 Air Purge Connection .................................................................................................... 10

5 Operation ............................................................................................................................. 12

5.1 Controls ......................................................................................................................... 12

5.2 Setting Parameters ....................................................................................................... 13

5.3 Parameter Menus ......................................................................................................... 13

6. Maintenance ....................................................................................................................... 15

6.1 Regular Maintenance ................................................................................................... 15

6.2 Returns of the LM-SD .................................................................................................... 15

7. LM-SD Enclosure Dimensions ............................................................................................. 16



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1. Introduction The LM-SD is a laser based distance measurement tool used to measure distances from 0.2m to more than 100m with pinpoint accuracy. A given target can be clearly identified with the help of a red laser sighting point. The usable range of the sensor is dependent upon target physical properties. The range finder is based on comparative phase measurement. It emits high-frequency modulated light which is diffusely reflected from the target and returns to the instrument with a certain phase shift compared with the emitted signal. The distance can then be determined with millimeter accuracy from the amount of this phase shift Special performance features are: - Provides high accuracy over long distances under extreme outdoor temperatures. - Works in a wide range of operating voltages from 10 VDC to 30 VDC - Features consistently low power consumption of <1.5 W (without IAlarm). - Up to 30m range for distance measurement, with the potential for more than 100m if additional reflectors are mounted onto the target (depending on reflectance and environmental conditions). - Visible laser beam for easier sighting. - Switching output and analog output are separately programmed. - Switching output tied to adjustable limits, indicating positive and negative over-range of pre-selectable distance range window. - Measured values can be displayed in meters, decimeters, centimeters, feet or inches.



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2. Description

2.1 Model Nomenclature

Record your Laser Meter’s complete Model Number here:

LM-SD - ___________

Base Model Power Input

24: 24VDC

110: 110VAC

Serial Number _________________

Figure 2.1: Model Number

2.2 Specifications

Accuracy ±3mm within 30m

Resolution 0.1 mm

Laser 650nm Visible red, <1mW Class II, 0.6 mrad scattering

Detect Range 0.2-100m Reflector needed between 30m and 100m

Response Relay < 320 ms, PNP < 300ms

Operating Temp -10˚C to +50˚C (14˚F to +122˚F). With water cooling: +110˚C (230˚F)

Storage Temp -10˚C to +70˚C

Output Relay NO/NC 125VAC @ 0.3A, PNP type output 24VDC @300mA,

Analog Output 4-20mA @ ≤500Ω Accuracy: ±0.15%

Temp Drift <50ppm/˚C

Power Input 24VDC ±10% <1.5W

Cable Insulation 20MΩ, 500VDC, ≥500˚C (930˚F)

Housing Hermetically sealed cast aluminum enclosure rated IP65, includes cooling water connections and air purge.

Size Enclosure; 280 mm L x 89 mm D x 300 mm H (with mounting bracket)

Weight 6kg (13.3 lbs)



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2.3 Operating Principle The Laser Meter operates on a time-of flight-principal, comparing the phase shift of the returned signal with respect to that of the emitted laser. Careful measurement of this phase shift indicates the time taken between sending the light signal and receiving the reflection back. This is directly proportional to the distance travelled.

3. Location and Mounting

3.1 Sensor Location The LM-SD Sensor should be installed so as to give a direct view of the target, unobstructed by dust, steam, hoses or passers-by. The mounting should be vibration free, as any motion of the sensor is magnified many times at the laser spot. This is a Class II laser, it should mounted not to shine directly into the eyes of plant personnel. Direct sunlight into the detector may cause erroneous readings. It is best to try to have the target surface normal to the laser beam



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Figure 3.1 shows the zero point on the LM-SD for calibration purposes. There is a parameter “OF” that allows the Zero Point to be changed to some other meaningful point in space.

Figure 3.1: Zero Point on the LM-SD

Mounting Distance- The sensor is rated at 30m operating distance without a reflector. Operation at the end of this range should be tested before final installation. For distances greater than 30m, a diffuse reflector is recommended.



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3.2 Sensor Mounting

Mounting Bracket- The LM-SD has an adjustable mounting foot designed to allow easy rotation through horizontal and vertical axes. The sensor is fixed to the support with a single 18 mm bolt through the LM-SD’s base mounting stand. The altitude angle may be changed by slightly loosening the three cap screws in the base with a 4mm Allen key, adjusting to the correct angle and retightening the same three screws. The support must be sufficiently rigid to absorb any excessive site vibrations that could affect the precision output of the detector.

Air, Cooling Water Fittings- The LM-SD has a water-cooling jacket to keep the electronics within their operating temperature range, and an air-purged hood for protection of the window glass. These sensors can thus be used in harsh environments with high temperatures, steam, dust, and smoke. Please see Section 4.2 Plumbing Connection and Section 4.3 Air-Purge Connection for further details on installing these protections for your sensor.

Caution- For installation in environments that may include excessive water vapor or smoke, it is recommended that additional ventilation such as air curtains or fans be used to clear the area so the sensor can “see” the target.



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4. Utility Connections

4.1 Electrical Connections Electrical Overview- All electrical connections (power and signal) to the LM-SD are made via

a 15-pin Harting style connector with ground. The sensor is supplied with a mating connector at the back of its enclosure and a standard 2-meter cable with the quick-connect assembly mating to the sensor and bare wire terminals for the junction box connections. Other cable lengths are available from Logika Technologies upon request.



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Figure 4.1 Connections to LM-SD Harting Connector

Cable Specification-

Multi-lead cables of 10 x 20 gauge (10 x 0.6 mm²) shielded Teflon insulation for high temperature applications.

Outer metallic braid for mechanical protection.

Overall diameter of 9 mm.

Minimum bending radius of 30 mm.



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Each lead is color-coded.

Junction Box Wiring- Please see Figure 4.1 for the sensor wiring diagram. The supplied cable should be connected directly to the terminals of a junction box. All cables must be shielded all the way to the console with the shield connected to ground to eliminate electrical noise, which may trigger false detection. Any unused output wires must have insulation protection or be connected to free terminals in the junction box.

Power Connections- Power Input (please specify power input at time of order). Currently, this instrument is available in the 24VDC format only.

Current Output- 4-20mA Current Loop proportional to measured position

Relay Output- Single-pole double throw contacts, contact capacity rating is 125VAC/0.3A, 30VDC/1A. Relay operating time ≤ 320 ms.

PNP Output – Maximum current 300 mA. Response ≤300 ms Note: PNP output and Relay output are isolated; these may wired to separate circuits PNP output and Relay output change state together.



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4.2 Plumbing Connection Description- Water cooling is required when the ambient temperature at the sensor’s

location is higher than 50oC (120oF). Temperatures above this level require protection for the electronics. A standard cooling water fitting is available at the sensor enclosure and copper heat exchanger tubing is embedded in the sensor housing to facilitate efficient heat removal from the sensor using circulating cooling water.

Cooling Water Requirements

Clean industrial water

Maximum water inlet temperature of 25oC (75oF).

Maximum water pressure of 4 bars (60 psi)

Water flow rate of 1 to 2 L/min (0.035 to 0.071 ft3/min)

Connection- Use ¼” flexible tube to connect the plant’s cool water supply to the sensor cooling water fitting and secure with a hose clamp. Use Figure 4.2, Ambient Temperature vs Water Flow Rate Graph, to determine the cooling water flow rate for the ambient conditions around the sensor.

Figure 4.2: Ambient Temperature vs. Water Flow Rate

4.3 Air Purge Connection Description- Compressed plant air can be used to prevent dust and vapor from entering the

protective shroud around the lens of the sensor. Using plant air with the sensor will reduce lens cleaning maintenance and prolong sensor life where dust or corrosive vapors are present.



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Compressed Air Requirements

Must be clean, dry air free of contaminants. Poor purge air quality will lead to dirty glass which may decrease sensor performance and increase sensor maintenance. Air filtration prior to the sensor purge inlet fitting is recommended for purge air of questionable quality.

Air Pressure range of 50 to 200 g/cm2 (0.71 to 2.84psi)

Air Flow rate of 4 to 16 L/min (0.14 to 0.56 ft3/Min)

Connection- Connect the plant purge air pipe to the air purge fitting on the sensor’s lens shroud using a 10mm hose. The purge air flows out of the sensor shroud and dissipates into the ambient environment.



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5 Operation

5.1 Controls The LM-SD Sensor’s Control Panel is located under the protective cover plate on the back of the sensor. The following functions are available at the Control Panel.

Figure 5.1: Control Panel

The five digit display shows the current reading in RUN mode and parameter information in SETUP mode. See Section 5.3 BUTTONS SET – Takes the unit into parameters or back to the menu ADD – Increments the displayed parameter or value. Holding the button increases

the speed. RED – Reduces the displayed parameter or value. Holding the button increases the

speed. OK – Saves parameter values and exits

LEDs Power – The unit is powered on Com – Flickers to indicate communications to the processor are active Alarm – Alarm threshold has been tripped.



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5.2 Setting Parameters

1. Press and hold the REDUCE button for two seconds until SEL-0 is displayed.

2. Press ADD or RED to select the desired menu (See Section 5.3). In this example we will use SEL-3, Alarm Center.

3. Press SET to go into setting mode. The screen in this case will display AC for one second, then switch to the current value of the parameter. 06.300 means the alarm value is set at 6.3m.

4. Press ADD or RED to adjust this value up or down. Holding one of these buttons will increase the rate the numbers change.

5. When the value is correct, press SET to return to the menu, in this example SEL-3.

6. After all of the parameters have been set, press OK to save the changes. The sensor will return to normal detect mode.

5.3 Parameter Menus SEL0 – No parameter

SEL1 – rb – Range Beginning: The distance reading that will correspond to 4mA output

Minimum Value: 00.000m

Maximum Value: 99.999m

Default Value: 00.200m

SEL2 –rE – Range End: The distance reading that will correspond to 20mA output.




SEL3 – AC- Alarm Center: The distance reading at which the alarm outputs change state.





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SEL4 – AH – Alarm Hysteresis: Width of the deadband on either side of the Alarm Center.

This prevents flicker of the Alarm Outputs.






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6. Maintenance

6.1 Regular Maintenance Normally, the LM-SD does not require major periodic maintenance. Regular attention to the following will ensure steady operation of the sensor:

Lens Cleaning- Routinely check the LM-SD sensor’s glass for dust or oil residue. Open the lens shield board at the front of the sensor by unscrewing the fastening hardware on the shield and clean the glass with alcohol and lens paper or soft cloth.

6.2 Returns of the LM-SD Contact us with the Serial Number of your sensor before you return our product. If we are

unable to solve the problem by phone or email, we will then provide you with a return authorization number.

Do not return the LM-SD without an authorization number. If the product is out of warranty, we will provide a repair estimate and then complete the

repairs after your approval.



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7. LM-SD Enclosure Dimensions

Figure 7.1: LM-SD Enclosure and Mounting Bracket Dimensions

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