Turbine Traders Ltd          1670 133rd PL NE

       Bellevue, WA 98005 USA 

Tel  425 644-0244
Fax 425 644-0663
PT6, PT6T, TwinPac,
Rolls Royce 250, Chadwick-Helmuth, Vibrex



Photocell System 915-10252

The Chadwick-Helmuth Photocell System is used to accurately measure rotational position for determining phase relationship between elements of rotating devices such as propellers, rotor blades, fans and shafts at repetition rates of 0.2 to 830 pulses per second. The Photocell Kit No. 10252 is used with the Chadwick-Helmuth Series 8500 Balancer/Analyzer, 192A Spectrum Analyzer and Velocimeter Balancers.

The Photocell System measures repetition rates for rotating devices, without affecting balance, tracking or vibration characteristics of the rotating device. The retro-reflective tape is attached to the surface of the rotating device to provide a reflective target for the Optical Probe. The Optical Probe is attached to a stationary mounting near the target so that the light transmitted from the Optical Probe is reflected back each time the rotating target passes. The light that is reflected back to the Optical Probe is sent to the Photocell Processor for signal processing.

The Photocell System signals are unaffected by external light such as sunlight, strobe or pulse light, and other ordinary lighting sources.


Dimensions - Optical Probe
Length 2.3 in. (5.9 cm)
Width 1.3 in. (3.3 cm)
Height .6 in. (1.5 cm)
Weight .08 lb. (36 g)
Dimensions - Photocell Processor
Length 5.6 in (14.0 cm)
Width 3.2 in (8.1 cm)
Height 1.6 in (4.1 cm)
Weight .65 lb. (295 g)
Dimensions - Battery Pack
Length 4.0 in (10.1 cm)
Width 3.2 in. (8.1 cm)
Height 1.6 in. (4.1 cm)
Weight .65 lb. (295 g)
Speed Range 12 to 50,000 RPM
Operating Range 1/2 in. to 26 in. (1.3 to 66 cm)
Input Power 11 to 32 VDC at 80 MA

Turbine Traders offers sales, calibration and repair for Chadwick-Helmuth 915-10252, 10252 and P0101 Photocell System, 10170-1 Photocell Processor, 10200-1 Optical Probe, 10220 Battery Module and 10185-50 cable.