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)
Center-mount 2.5" (63.5 mm) Blade
Available with dial or digital indicators
The Western Instruments N88-2 Pit Depth Gauge is used to measure the Pit Depth or the amount of surface corrosion on metal constructions like pipelines, support structures, storage tanks, drill pipes, steel bridges, aircraft components or concrete structures.
The N88-2 Pit Gauges assure compliance with vessel, pipeline, tank and OCTG specifications for corrosion and erosion depth measurement
Kit Contents
- Western Instruments N88-2 Basic Pit Gauge
- Center-mount 2.5" (63.5 mm) blade
- N88-S - Standard contact tip
- N88-C - Conical contact tip
- Allen wrench (for adjustment)
- Calibration Certificate
- 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.
Related Products
N88-12
Reference Pit Gauge- 5.5 (140mm) long, 0.75 (19mm) wide with inverted V Edge, 2 magnet cartridges. Similar and interchangeable with Bridging Pit Gauge Main Blade.
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