Western Instruments N88-5 Reaching Pit Depth Gauge 4.75" Blade, Measures Corrosion and Material Loss
Western Instruments Pit Depth Gauges assure compliance with vessel, pipeline, tank and OCTG specifications for corrosion and erosion depth measurement.
Measuring Range: 0.0-0.5" (0.0 - 12.7 mm)
Resolution: 0.001" (0.01 mm)
Dial Diameter: 1.4" (35.5 mm)
4.75" (121 mm) Blade
Available with dial or digital indicators
Western Instruments Pit Depth Gauges allow the Corrosion Inspector to conveniently measure Pit Depth or material loss in areas of Weight-Loss Corrosion.Various Blades for the Pit Gauges are available for different applications, including the Bridging Pit Gauge which permits Inspectors to Span or Cantilever over large areas of Weight-Loss Corrosion, to get a true measure of Pit Depth.
The most significant advantage the Reaching Pit Gauge offers is its ability to span over areas of corrosion, referencing the original surface as the zero point. If a pit is Wide, Shallow, as defined by ASTM G46, the Blade of the Pit Gauge can reference the zero point (surface) and reach the Dial Contact Point above the entire opening of the pit. Such a pit can be 150mm (6”) in diameter, if it is accessible from both sides. The inspector simply needs to maintain a reasonable contact and reference to parent material.
Another significant feature on the Reaching Pit Gauge is the Cut-Away Nose, which allows several extra capabilities. The Cut-Away Nose is 37mm (1½”) from the outer edge of the Blade to where it begins to contact the surface (zero). This feature allows the inspector to measure corrosion located on the Toe of a Weld. If the workpiece is configured with a Riser, Gusset, or Reinforcing Pad, the inspector simply rotates the Dial Indicator by 90°, re-zeros, and can measure up to 9.5mm (⅜”) from the obstruction. This ability is illustrated to the right with a Digital Reaching Pit Gauge (N88-5-D). How much the Dial Indicator is rotated, does not affect the operation of the Pit Gauge. Lastly, the Reaching Pit Gauge can be used for Weld Inspection on Height and Depth parameters, such as Undercut, Weld Reinforcement, and Edge Alignment. The Reaching Pit Gauge can reach over an existing weld to confirm edge alignment and undercut.
Kit Contents
- Western Instruments N88-5 Reaching Pit Gauge
- 4.75" (121mm) Blade
- End Mount Dial Indicator with Nose Cutout
- N88-S - Standard contact tip
- N88-C - Conical contact tip
- Allen Wrench (for adjustment)
- Calibration Certificate Without Data
- Operator Instructions
- Carrying Case
Features
Zeroing Dial Indicator
- To quickly check the Zero Point of the Dial indicator, place the Blade on a representative smooth surface.
- Gently press the Plunger, until the contact point touches the surface.
- While the contact point is on the surface, loosen the Bezel Lock, and rotate the Bezel Scale until it reads '0' with respect to the pointer.
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Height Zeroing
- Loosen the Fastener(s) holding the Dial Indicator in place.
- Hold the Blade firmly on a Flat Surface, and gently press the body of the Dial Indicator down until the contact point touches the flat surface.
- Carefully re-tighten the Clamp Fastener(s) or the Set Screw.
- Any fine zeroing can be done by rotating Bezel Scale on the Indicator.
- Height Zeroing should be done, whenever the unit is put into to use.
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Zeroing a Digital Indicator
- Digital Indicators can be Height Zeroed or Positioned in the same way as a Mechanical Dial Indicator.
- To Zero the Digital Indicator simply press the Zero Button when the Contact Point is on a reference point. If the Digital Indicator is Height Zeroed, press Zero when the Plunger is fully retracted.
- To select Metric or Imperial Measurement, simply press the mm/in Button.Whennot in use, press the On/Off Button to turn the Indicator off.
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Indicator Positioning
- The position (or rotation) of the Dial indicator can be changed by simply loosening the Clamp Fasteners or Set Screw, and rotate the Dial Indicator about the Blade.
- After the Dial Indicator is rotated, the unit should be Dial Zeroed.
| Specifications
Dial and Digital Indicators
|  | | |
| Model | Imperial Dial Indicator | Metric Dial Indicator | Digital Indicator |
| Range | 0.0-0.5" | 0.0-12.7 mm | 0.0-0.5" |
| Resolution | 0.001" | 0.01 mm | 0.0-12.7 mm |
| Dial Diam. | 1.4" | 35.5 mm | 56 mm, 2.2" |
Measuring Corrosion (Depth)
| | | |
| Model | 1-Standard Tip | 2-Conical Tip | 3-Needle Tip |
| Diam. | 0.040" diam. | 0.010" diam. | 0.005" diam. |
| Tipe / Part Number: | #1 Contact Point-Standard N88-S | #2 Contact Point-Conical N88-C | #3 Contact Point-Needle N88-N |
* Western offers a variety of Contact Points, which are all 0.625" (16mm) long. Any ADG Contact point can be used with our special dial indicators, but a different length may affect Height Zeroing, or the vertical position of the Dial Indicator. Contact Points are easily replaced, by extending the Contact Point , and turning it counter clockwise.
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