LMI Technologies G2 User manual

G2 Protective Cover
User Manual
15275.01.01_MANUAL_User_G2_protective_cover.pdf

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G2 Protective Cover Quick Start Guide
The G2 protective cover is used on certain Gocator 2500 and Gocator 2600 sensors (see the list
below)to prevent scratches or breakage to the sensor's laser and camera windows. The protective
cover features replaceable windows and gaskets to provide secure and reliable protection.
For applications that rely on absolute measurements, LMI recommends applying scaling values to
the measurement outputs. For information, see Calculating and Applying a Measurement Scale on the
next page.
The protective cover's windows reduce light transmission by up to roughly 16%. If you are
adding a cover to an existing application, you may need to adjust the sensor's exposure.
The following table lists the supported sensors and available protective covers:
Description Part Number
Protective Cover for 2629, 2630 301275
Protective Cover for 2540, 2550, 2640 301276
Protective Cover for 2650, 2670, 2690 301277
Window service kit for Protective cover, qty. 5 301278
For detailed information on installing and configuring Gocator sensors, see the sensor user manual.
For information on reordering windows and gaskets, contact LMI.

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Installing the Protective Cover
The protective cover is pre-assembled (cover, gaskets, and windows). Make sure that the sensor
windows and housing face are clean before installing the protective cover.
To install the cover on the sensor, use the provided screws. (The number of screws is model-
dependent.)
Calculating and Applying a Measurement Scale
Use the information in the following sections if you need to calculate and apply a scale to your
measurements.
Target and Mounting
LMIrecommends purchasing or manufacturing a gauge block for the procedure. The target's height
should be 50% to 75%of the sensor's measurement range. The width of the target should be less
than the sensor's FOVat mid-range. To determine an appropriate size for the target, see your
sensor's specifications in the sensor user manual.
You must securely mount the sensor above a stable surface.Because you must take two sets of
measurements, if the sensor moves between measurements, the results will be inaccurate. Mount
the sensor so that the surface you will scan (target or table surface) is in the upper half of the
sensor's measurement range.

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You should install the protective cover without unmounting the sensor.
Collecting Height Measurements
You must collect measurements twice:before installing the protective cover and after installing the
protective cover. Do not change the sensor height between measurements.
To perform measurements for scaling calculation
1. Mount the sensor above a flat surface.
The sensor should be mounted so that the top of the target will be in the upper part of the sensor's
measurement range.
For more information, see Target and Mounting on the previous page.

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2. Align the sensor to the flat surface under the sensor.
Gocator 6.x
On the Scan page, in the Alignment panel, click
Align.
GoPxL
On the Alignment page, in the Alignment section,
click Align Sensor... and follow the steps in the
alignment wizard.
3. Place the target in the sensor's field of view.
For important information on the target and its position in the sensor scan area, see Target and Mounting on
page3.
4. On the Scan page, set the sensor to Profile mode.
Gocator 6.x GoPxL
5. Capture a profile to make sure the target is in the sensor's field of view.

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The Gocator 6.x interface is shown here.
Sensor profile: Target producing the profile:
6. On the Measure page, add a Profile Position tool.
Gocator 6.x GoPxL
Double-click the tool or drag and drop it to the space
to the right.

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7. Place the tool's region on the top of the target's profile, resizing it if necessary to include only the top.
The Gocator 6.x interface is shown below.
8. Set the feature to Average and enable the Z measurement.
Gocator 6.x GoPxL
9. Enable recording.
Gocator 6.x GoPxL

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10. Acquire 10 or more profiles, and on the Dashboard page (Report >Health page in GoPxL), make note of the
resulting average measurement for the Z measurement.
Gocator 6.x
GoPxL
11. Install the protective cover.
Be sure not to change the height of the sensor or otherwise move it.
For information on installing the cover, see Installing the Protective Cover on page3.
12. Re-align the sensor.
For instructions, see step 2.
13. Acquire 10 or more profiles and make note of the resulting average measurement for the Z measurement.
You should acquire roughly the same number of profiles as in step 10.
Collecting Width Measurements
You must collect measurements twice:before installing the protective cover and after installing the
protective cover. Do not change the sensor height between measurements.
To perform measurements for scaling calculation
1. Mount the sensor above a flat surface.
The surface should be roughly at the mid-point of the sensor’s measurement range.
For more information, see Target and Mounting on page3.

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2. Align the sensor to the flat surface under the sensor.
Gocator 6.x
On the Scan page, in the Alignment panel, click
Align.
GoPxL
On the Alignment page, in the Alignment section,
click Align Sensor... and follow the steps in the
alignment wizard.
3. Place the target in the sensor's field of view.
For important information on the target and its position in the sensor scan area, see Target and Mounting on
page3.
4. On the Scan page, set the sensor to Profile mode.
Gocator 6.x GoPxL
5. Capture a profile to make sure the target is in the sensor's field of view.

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The Gocator 6.x interface is shown here.
Sensor profile: Target producing the profile:
6. On the Measure page, add a Profile Dimension tool.
Gocator 6.x GoPxL
Double-click the tool or drag and drop it to the space
to the right.

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7. Place the tool's regions on the left and right edge of the target.
The Gocator 6.x interface is shown below.
8. Set Feature 1 to MinX and Feature 2 to Max X, enable the Width measurement output.
Gocator 6.x GoPxL
9. Enable recording.

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Gocator 6.x GoPxL
10. Acquire 10 or more profiles, and on the Dashboard page (Report >Health page in GoPxL), make note of the
resulting average measurement for the Width measurement.
Gocator 6.x
GoPxL
11. Install the protective cover.
Be sure not to change the height of the sensor or otherwise move it.
For information on installing the cover, see Installing the Protective Cover on page3.
12. Re-align the sensor.
For instructions, see step 2.
13. Acquire 10 or more profiles and make note of the resulting average measurement for the Width
measurement.
You should acquire roughly the same number of profiles as in step 10.
You are now ready to calculate the measurement scales. For more information, see Calculating a
Measurement Scale below.
Calculating a Measurement Scale
Once you have averages of the measurement with and without the protective cover (see Collecting
Height Measurements on page4), you can calculate the measurement scale you need to apply in the
measurements you use in your application.
Use one (or both)of the following:
To calculate the Z measurement scale
1. Calculate the error introduced by the protective cover.

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Use the following formula:
errormeasurement = ZaverageWithCover - ZaverageWithoutCover
Using the numbers from our example:
errormeasurement = 80.091 - 79.976 = 0.115
2. Calculate the scaling.
Use the following formula:
scaling = 1 - (errormeasurement / height of target)
For our example, using an 80 mm gauge block:
scaling = 1 - (0.115 / 80) = 0.9985625
To calculate the X measurement scale
1. Calculate the error introduced by the protective cover.
Use the following formula:
errormeasurement = WidthaverageWithCover - WidthaverageWithoutCover
Using the numbers from our example:
errormeasurement = 79.814 - 79.595 = 0.219
2. Calculate the scaling.
Use the following formula:
scaling = 1 - (errormeasurement / width of target)
For our example, using an 80 mm gauge block:
scaling = 1 - (0.219 / 80) = 0.9972625
You can now use the resulting scaling value to correct the measurements in your application. For
more information, see Applying the Scaling in Measurements below.
Applying the Scaling in Measurements
Follow the steps below to apply the scaling to your measurement tools.
For height or Zmeasurements, use the scaling you calculated in To calculate the Z measurement scale
on the previous page.
For width or Xmeasurements, use the scaling you calculated in To calculate the X measurement scale
above.
The following shows how to add scaling to a Z measurement.
To add scaling in Gocator firmware 6.x
1. Add a tool with a height (Z) measurement.
2. In the Tools panel, in your tool, enable and select the measurement you want to correct.
3. Expand the Filters section in the Output tab and enter the scale you calculated in Calculating a
Measurement Scale on the previous page.

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To add scaling in GoPxL
1. Add a tool with a height (Z) measurement.
We will use a Profile Position tool.
2. Add a Measurement Formula tool.
3. In the Inputs section, set the Measurement Formula's Variable 1 input to the output of the measurement
you need to scale.
4. In the Parameters section, in the Formula field, multiply the variable's alias (here, M1) by the scaling value.

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5. Use the Measurement Formula's Result output for the adjusted height measurement output.
Cleaning the Windows
If the cover's windows become dirty, start by using clean air to remove dust or other debris. If
necessary, use the provided wipes. Otherwise, use warm, soapy water to clean the windows
carefully. Wipe the windows dry with a soft, lint-free cloth. Ensure that no residue is left on the
windows after cleaning.
Replacing the Windows
You should wear gloves when replacing the windows.
To replace a window and gasket
1. Place the protective cover face down.
2. Remove the plastic film from the outer, target-facing side of a window and place it into the cover.
The windows are keyed to ensure the proper orientation.
3. Remove the plastic film from the inner, sensor-facing side of the window.
4. Remove the paper backing from the gasket to expose the adhesive.
5. Carefully position the gasket onto the cover around the window.

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6. If necessary, repeat steps 1 to 5 for the second window.
If you are using a measurement scaling value, be sure to re-do the steps described in Calculating and
Applying a Measurement Scale on page3 before re-installing the cover.