Heidenhain MT 101 Metro Length Gauges provide ±1 um accuracy, and 11uApp output. The MT 101 feature an integral motor that moves the plunger. It is operated through the switch box either by push button or over the connection for external actuation. The gauging force of the MT 101 is constant at 0.7 N both vertically downward and horizontal.
For the Heidenhain MT 101K Metro Length Gauges the plunger is freely movable. For position measurement, the plunger is connected by a coupling with a moving machine element. The force needed to move the plunger is specified as the required moving force. It depends on the operating orientation.
Motorized plunger actuation: The MT 101M length gauges feature an integral motor that moves the plunger. Required is a switch box, SG 101M, which is connected to the gauge where it can be operated up and down through the push of a button or over the connection of external actuation. Plungers cannot be moved by hand if the switch box is connected. The gauging force of these motorized length gauges is adjustable in three stages through the switch box. The force remains constant over the measuring range but depends on the operating orientation.
Mounting: The MT 101 length gauges are fastened by two screws onto a plane surface. These screws ensure a mechanically stable installation of even these large gauges. Special holders are available for fastening the MT 101 to the MS 100 gauge stand for the Heidenhain Metro length gauge.
Thermal dynamics: Heidenhain MT 101 length gauges have a defined thermal behavior. Since temperatures can vary during the measurement process and possibly cause a measuring loop, Heidenhain uses special low coefficient of expansion material for the components of the measuring loop. The Heidenhain MT 101 has IP 50 Protection.
Repeatability: Whereas the system accuracy applies over the entire measuring range, for some applications the reliability is the decisive factor. It plays an important role in repeated measurements. The repeatability of the length gauges is usually better than the values listed by Heidenhain. Reliability depends on the combination of materials used in the components, installed electronics, optomechanics used, and the bearing of the plunger. The MT 101 Metro Gauge has a repeatability of 0.04um.