Technical data

Working temperature

20 °C (+/- 5 K) with mechanical spirit levels
0 °C to + 40 ° C with electronic spirit levels

Storage temperature

From -40 °C to + 70 °C with mechanical spirit levels
From -20 °C to + 70 °C with electronic spirit levels

Shaft diameter minimal

19.3 mm (special models 4520-4523 for larger shaft diameters)  
15.4 on models 422x / 100
3.0 mm on models 4620 / xxx

Shaft diameter maximum

115.9 mm (special models 4520-4523 for larger shaft diameters) 
85.0 on models 422x / 100
30.0 mm on models 4620 / xxx

Measuring range: mechanical

Depends on the sensitivity of the built-in bubble and the number of scale divisions. The product of precision and number of scale divisions gives the value of the measurement range after each page.
Example: With an sensitivity of 0,02 mm/m (20 μm/m) and 6 scale parts (from the middle to each side) the measuring range is +/- 6 x 0,02 mm/m = +/- 0,12 mm/m (+/- 120 μm/m).

The exact data are located at the respective product in the shop.

Measuring range: electronic

+/- 15 degrees at all MICROLEVEL models

Properties:

Fixed installation and adjustability

Roeckle guarantees consistent sensitivity through tension-free installation of the bubble. This eliminates time-consuming readjustments and calibrations before measuring.

Casing

Roeckle precision spirit levels according to DIN 877 have a sturdy design made of high-quality special cast iron, textured. Available depending on the model in lengths of 60, 90, 100, 120, 150, 160, 200, 250, 300, 500 mm.

The existing full heat protection around the entire housing prevents influences from hand and breath heat.

Housing recesses allow lateral reading of the dragonfly.

Measuring surfaces

With prismatic (150 °) and flat sole, for aligning horizontal surfaces and waves. All measuring surfaces are finely ground.

Versions are also available with flat sole, with magnetic inserts or with holes for fixing screws.

Customized designs (other angles) are possible at any time.

Sensitivity

The devices are equipped with polished and split longitudinal spirit level and transverse level. Available depending on model and length in the sensitivities 0.6, 0.3, 0.1, 0.04, 0.02, 0.01 mm / m. The scale value of the longitudinal level is indicated on the nameplate. The permissible deviations are very different according to DIN 877 depending on the sensitivity.
Example: The sensitivity of 0.02 mm / m means: If the inclination of 20μm at a distance of 1 meter deviates, the air bubble will move 1 scale towards the higher side. According to DIN 877, the permissible deviation is 5μm (corresponds to 0.5 scale division).

Application process:

Operating instruction and appropriate treatment of Precision Levels:

1. The measurement device is highly sensitive and must be protected against humidity, cold and heat. The working temperature of mechanical Precision Levels is 20°C (+/-5 K), the storage temperature is from -40°C to +70°C.
2. Before use, the precision spirit level must be acclimatized to the same temperature as the object to be measured. Both objects must be within the working temperature range.
3. The measuring surface of the object to be measured and the measuring surface of the precision spirit level must be absolutely clean.
4. Before and during measurement the spirit level only must be touched on the plastic hand grips for thermal protection.
5. Human body and respiratory heat as well as solar radiation can influence the measurement result. Unnecessarily long body proximity to the precision spirit level is to be avoided.
6. Slide (but don’t put) the level on the object. There must be a close contact between the level and the object. The precision spirit level must always rest well.
7. In order to obtain a stable result, the precision spirit level on the measuring surface must not be damaged (scratches or impact marks) and, in particular, must not tilt or wobble. Small scratches can be removed carefully with a whetstone.
8. The measurement result can only be read when the air bubble has completely stopped oscillating. This can be up to 40 seconds depending on the sensitivity of the spirit level.
9. In the case of multiple measurements, the precision spirit level must always be pushed to the same position so that any unevenness of the surface to be measured is excluded.
10. For high-precision precision spirit levels, it must be ensured that vibrations in the environment are not transmitted to the object to be measured.
11. In order to exclude all measuring errors, it is essential to carry out a control measurement on the reversal measurement (turn by 180 °) before each measurement, for instructions see below procedure: Checking the zero-point deviation.
12. After use, the measuring surface of the precision spirit level always must be stored oiled or greased in its case for protection.
13. Repairs require expertise and should therefore only be performed by the manufacturer.
14. In order to keep the spirit level reliable for a long time in a usable condition, the manufacturer offers a cost-economic calibration and maintenance service.
15. Attention: In case of damage of the vial by external impact, the room must be vented effectually. The liquid of the vial evaporates into the environment. It may cause nausea, dizziness or unconsciousness in the worst case.

Checking the inclination, e.g. of a machine, by an 180° turn of the precision spirit level

Slide the level on a clean, plane and smooth horizontal surface. The negative range is on the left of both index lines, the positive range is on the right. The position of the static bubble is the value A1 and A2 (in scale parts Scp) on the scale. Turn the level through 180 degrees, slide it to the same position of the surface. The values B1 and B2 will be added to A1 and A2 then devided by 4. The result is the inclination (A1+A2+B1+B2)/4 in Scp. (For A1 it has to be read the difference from the right bubble end to the right zero line, for A2 on the left side. For B1 and B2 it will be read after turning with the same method. The algebraic sign must be observed.
Example: Sensitivity 0.1 mm/m: value A1 = -1.2 Scp, value A2 = -0.2 Scp, value B1 = -1.0 Scp, value B2 = +0.0 Scp Inclination of the machine = -0.6 Scp = -60 μm/m (increasing left)

Checking the zero-point deviation of precision spirit levels by an 180° turn (self-testing of the spirit level)

Slide the level on a clean, plane and smooth horizontal surface (We recommend a measuring plate, Flatness Class 00). The negative range is on the left of both index lines, the positive range is on the right. The position of the static bubble is the first indicated value A (in scale parts Scp) on the scale. Turn the level through 180 degrees, slide it to the same position of the surface. Read the second indicated value B. Subtract value B from value A then devide by 2. The result is the zero point deviation DoE = (A-B)/2. Each test result is to be read on the equal index line (e.g. on the right). The algebraic sign must be observed.
Example: Sensitivity = 0.02 mm/m, value A = -0.6 Scp, value B = -1.0 Scp, DoE = +0.2 Scp = 4 μm/m