SURVEYING WITH THE PRO-LEVEL
The Pro-Level Manometer is unique in that it can be used to perform both upper surface (ceilings) and lower surface (floors & ground) surveys. The principles involved are the same for both types of surveys. The diagram to the left depicts measurements taken on a floor surface to determine the relative elevation differential between two points.
The reservoir has been adjusted to a height that will fall within the anticipated range of the area to be surveyed. The first measurement is made by placing the base of the rod on the ground and then reading the height of the water column in the graduated transparent tube. The stadia is then moved to the next location and a second reading is performed. The elevation differential is equal to the difference between the two readings. For example, referring to diagram below, the first reading (R1) may be 25.3 inches. The second reading (R2) could be a value such as 7.6 inches. This means that survey point 2 is 17.7 (H) inches (25.3" - 7.6" = 17.3", R1 - R2 = H) lower than survey point one.
One of the most common uses for a manometer is the performance of a floor survey inside a building. Numerous elevation points can be made quickly and reliably, behind all walls with a single operator in the method described above. The diagram to the left shows the reduced data (lowest point normalized to zero) with topographic contours depicting the deformed floor configuration.
A convenient feature with the Pro-Level Manometer is that the reservoir can be lowered several feet without moving the stand to survey areas of stepped elevation such as a garage or sunken living room. The Pro-Level Manometer comes with a detailed User's Manual giving step-by-step instructions on how to perform a proper floor survey.
The Pro-Level Manometer can also be used to establish points of equal or differing (sloping) elevations for construction purposes.
To establish a series of level points on a surface such as a wall or set of stakes, first determine a reference on the manometer rod (refer to diagram to the left). This reference could be the bottom of the rod, the top of the rod, or any intermediate mark. A reference that will be near the water level or operator eye height in the transparent tube is often preferable. Next, determine the level on the wall surface or stake you wish to establish (control elevation mark) and place the reference on the rod alongside this control elevation mark. Note and record the reading (For purposes of this example we will assume a value of 11.3 inches, R1). Move to the stake you wish to establish your next level point. Adjust the rod by either raising or lowering it until the reading of 11.3 inches is obtained again (R2). The level on the wall or stake directly adjacent to the reference mark on the rod is at the same elevation as the first mark. Subsequent level marks (R3, etc.) can be obtained by performing the preceding sequence in the same manner.
Sloping Or Differential Elevations
Establish a reference on the rod as discussed above. After determining your control elevation mark at your first point (Stake 1 in diagram to the left), place the reference on the rod alongside the control elevation mark and record the reading (for purposes of this example we will assume a reading of 15.6 inches, R1). If for example, you wanted your next point to be 10.0 inches (H) lower, you would move the rod to the next area (Stake 2) and lower the rod until a reading of 5.6 (R2) inches (15.6" - 10.0" = 5.6", R1 - H = R2) is achieved. The level directly alongside the reference mark on the rod is the point desired. If you require a point 10.0 inches higher you would raise the rod until a value of 25.6" (15.6" + 10.0") is achieved.