Western Instruments N88-9 Bridging Pit Gauge

Description
Price: $750.00 to $885.00
Western Instruments N88-9 Bridging Pit Gauge
Measuring Range: 0.0-0.5" (0.0 - 12.7 mm)
Resolution: 0.001" (0.01 mm)
Dial Diameter: 1.4" (35.5 mm)
The Bridging Pit Gauge® can be assemble up to a length of 28.5" (724 mm) long; can be extended if necessary
Available with dial or digital indicators

The Bridging Pit Gauge® System allows the Corrosion Inspector to Span over or Cantilever into Large Areas of Weight Loss Corrosion, to obtain accurate and consistent measurements, or cross sections, of Pit Depth. As conditions dictate, the operator can simply use the Main Blade or can assemble the Bridging Pit Gauge® up to an over all length of 28½” (725mm).

The contact Surfaces (Blades) of the Bridging Pit Gauge® are fitted with an exclusive Knife Edge, so they can be used on Flat, ID (Convex), and OD (Concave) Surfaces, where a flat or notched contact surface can introduces error on Convex Surfaces. Like our Standard Pit Gauges, the Knife Edge gives the operator a clear view of the contact point, and the area being inspected.

With the addition of the optional Magnetic Hold Downs, the operator uses their width to quickly align the Bridging Pit Gauge System® to a curved surface. This leaves his hands free to scan through very large areas of weight loss corrosion. This holds true when the Bridge Elements have been assembled with a slight contour on an irregular surface.


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Parts of the N88-9 Bridging Pit Gauge
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Name
Part Number
Description
Bridging
Pit Gauge
N88-9Main Blade, Imperial (Inch), Metric or Digital Indicator, Connector Blade, 2-Extender Tees, End Blade, Slider Blade, Hardware, Extra Contact Point, and Carrying Case.
Main BladeN88-9-1Center and End Dial Indicator Mounting Positions, Cutaway Nose for next to welds. 5.5" (144mm) long.
Connector BladeN88-9-2Joins Tee Sections to increase length. 3.5" (90mm) long.
End BladeN88-9-3Mounts on end of Tee for extra contact. 1.5" (38mm) long.
Slider BladeN88-9-4Extra Point of Contact and doubles as an End Blade in Spanning Configuration. 1.5" (38mm) long.
Extender TeeN88-9-5Extends effective length of all models. 12" (305mm) long (Longer Tees are optional).
Magnetic
Hold Downs
N88-9-61 required for each Tee Section used. 15/8" (41mm) long.
Fastener KitN88-9-7Fasteners, Al



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Features
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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.

Click to enlarge image

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.

Click to enlarge image

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.

Click to enlarge image

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.

Click to enlarge image


Magnetic Hold Downs

  • Magnetic Hold Downs are intended for Scanning with a Bridging Pit Gauge®, however they can be used on any of the Jr. Bridging Pit Gauge® Group, with a diminished range of motion. Magnetic Hold Downs also provide the inspector with increased mobility, as he is not required to support the Bridging Pit Gauge.

Click to enlarge image




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Specifications
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Dial and Digital Indicators
Metric Dial IndicatorRange:
Resolution:
Dial Diam.
0.0-12.7 mm
0.01 mm
35.5 mm
Imperial Dial IndicatorRange:
Resolution:
Dial Diam.
0.0-0.5"
0.001"
1.4"
Digital IndicatorRange:
Dial Diam.
0.0-0.5"
0.0-12.7 mm
56 mm, 2.2"
Measuring Corrosion (Depth)
1-Standard Tip0.040" diam.#1 Contact Point-Standard N88-S
2-Conical Tip0.010" diam.#2 Contact Point-Conical N88-C
3-Needle Tip0.005" 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 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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Complete Kit
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Photo Gallery
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Related Products
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N88-9B
Basic Bridging Pit Gauge

  • Bridge Type Pit Gauges - Metric, Imperial or Digital Indicator Options
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N88-11
Jr. Bridging Pit Gauges

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N88-11B
Jr. Bridging Pit Gauge Basic

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N88-11P
Jr. Bridging Pit Gauge Plus
  • Manufacturer: Western Instruments
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N88-11S
Jr. Bridging Pit Gauge Super

  • Jr. Bridging Pit Gauge Super - up to 27 inches (686 mm) long
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Downloads
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Western Instruments N88-9 Bridging Pit Gauge - Instruction Manual


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