This is the Futaba RPM Sensor (Optical type)
For Futaba telemetry systems
FEATURES: This sensor, when used in conjunction with a telemetry-enabled
radio system, is used to indicate the rotation speed of a
propeller, rotor, or other component. Nothing needs to be
attached to the component since the sensor uses available
light reflected off that component.
INCLUDES: One RPM sensor with attached cable
One plastic mounting bracket
Two pieces of double-sided foam tape
One instruction sheet
One warranty sheet
REQUIRES: Connection to S.BUS 2 system
SPECS: Weight: 4.9g (0.173oz)
Voltage: 3.7 to 7.4 VDC
Range: 360 to 300,000 RPM/Fin(s)
Sensor, length, overall: 6-1/4" (160mm)
width: 28mm (1-1/8")
height: 13mm (1/2")
Mounting bracket, length: 34mm (1-3/8")
width: 26mm (1")
height: 12mm (1/2")
Foam tape, length: 22mm (7/8")
width: 22mm (7/8")
thickness: 1.3mm (1/8")
COMMENTS: This sensor will only work with S.BUS 2-compatible devices.
Helicopters: Because of the large rotor diameter, use of this sensor
on a helicopter is not recommended. A magnetic sensor, such as the
Futaba Magnetic RPM Sensor 18MZ (FUTM0852) is suggested.
Brightness: Adequate light is needed for this sensor to operate
properly. Conditions such as dusk, dawn, clouds, indoor
operation, poor angle-of-reflection off of propellor or fin, etc.,
will result in a measurement of 0 RPM.
Installation: It is recommended that the sensor be mounted at or
less than 150mm (6") from the object whose rotation speed is
being measured. The closer to the object the sensor is mounted,
the more reliable the measurements will be.
Set-up: The default slot number for this device is 2. Information on
changing the slot number can be found in the transmitter manual.
This device also has a default S.BUS 2 ID number which will need
to be changed if more than one SBS-01RO sensore is attached to the
same S.BUS network. The default ID number can be found on the
side of the unit.
Number of blades/fins: The number of blades on the object whose
RPM is being measured is two. If the object has more blades or
fins, please consult your transmitter manual for information on
changing this number.