Engine Indicator Type 50

Engine Indicator



An engine indicator measures dynamic pressures within large combustion engines. It draws a pressure-angle diagram corresponding to the pressure cycle within each cylinder of the engine. This indicator diagram helps to analyze the performance of each cylinder and the overall performance of the engine.
The engine indicator Type 50 is especially designed to analyze the performance of slow-running marine diesel engines, locomotive engines, and engines used in stationary power plants. It features a union nut, a pressure housing, an internal piston assembly, a stylus arm and a recording drum. The engine indicator is connected to the engine´s indicator valve using the union nut.
The engine indicator Type 30 has gone out of production. It is replaced by the Digital Pressure Indicator DPI. The DPI is an electronic engine indicator that may also be used as an alternative to the Type 50.


  • Individually calibrated high accuracy heat treated springs
  • Rugged and proven design
  • Easy and simple operation by unskilled operator
  • Ready-to-use equipment
  • Cheapest way to analyze your engine


Engine Indicator Type 50

Pressure range: up to 300 bar, see spring table below
Standard connection: W 27 x 1/10"
Engine range: up to 300 rpm or max. dp/dt = 9 x 10³ bar/sec
Diagram: max. 50 mm/80 mm (height/length)
Drum diameter: 50 mm
Paper size: 180 mm x 65 mm
Dimensions: 165 mm x 130 mm x 90 mm




Scale Max. Pressure Spring No. Part-No.
0.35 mm/bar 140 bar 50/14 bar 4651.0.71.14000
0.30 mm/bar 160 bar 50/16 bar 4651.0.71.15000
0.25 mm/bar 200 bar 50/20 bar 4651.0.71.16000
0.20 mm/bar 250 bar 50/25 bar 4651.0.71.17000
0.15 mm/bar 300 bar 50/30 bar 4651.0.71.18000
Spring table for piston 1/10, piston diameter 6.41 mm