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)
5.5" (140mm) Long, 0.75" Wide 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
Kit Contents
- Western Instruments N88-12 Reference Pit Gauge
- 5.5 (140mm) long, 0.75 (19mm) wide with inverted V Edge
- 2 magnet cartridges
- Operator Instructions
- Carrying Case
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Features
Zeroing Dial Indicator
- The vertical position of the Contact Point, needs to be Zeroed with respect to the Knife Edge of the Blade.
- Zeroing can be accomplished in two ways; by adjusting the Height of the Dial Indicator in the Blade; or by Rotating the outer Bezel Scale while pressing on the Plunger onto a flat surface.
Scale Zeroing- 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.
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Specifications
Dial and Digital Indicators
 | Metric Dial Indicator | Range:
Resolution:
Dial Diam. | 0.0-12.7 mm
0.01 mm
35.5 mm |
 | Imperial Dial Indicator | Range:
Resolution:
Dial Diam. | 0.0-0.5"
0.001"
1.4" |
 | Digital Indicator | Range:
Dial Diam. | 0.0-0.5"
0.0-12.7 mm
56 mm, 2.2" |
Measuring Corrosion (Depth)
 | 1-Standard Tip | 0.040" diam. | #1 Contact Point-Standard N88-S |
 | 2-Conical Tip | 0.010" diam. | #2 Contact Point-Conical N88-C |
 | 3-Needle Tip | 0.005" diam. | #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 specialdial 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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