ISSPRO R4902 User Manual
Dual level speed switch p/n r4902
ISSPRO, INC. 2515 N.E. Riverside Way, Portland OR 97211
Telephone: (503) 528-3400 Toll Free: (800) 888-8065
FAX: (503) 528-3495
Form No. IS006 (12/11/2013 Rev. D) Page 1 of 2
Dual Level Speed Switch P/N R4902
Serial No. ____________________________________________. This number corresponds to the number inside
and on the bottom of the speed switch for identification.
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Order Information:
[ ] Sensor Input: Pulses per revolution (gear teeth, magnets, etc.) = ________________________
[ ] Ignition Input: Number of cylinders = ___________________
[ ] R8970 Sender: For 1 engine rev the sender drive turns: ___________________ rev(s);
For vehicle speed: Turns per mile (transmission cable drive) = __________________
Lower Trip Point = __________________, Higher Trip Point = _____________ [ ] RPM or [ ] MPH
Lower Range (if specified) = ___________________ to ______________________ (RPM or MPH)
[ ] Not latched or [ ] Latched
Higher Range (if specified) = __________________ to ______________________ (RPM or MPH)
[ ] Not Latched or [ ] Latched
Operating Voltage = [ ] 12 VDC or [ ] 24 VDC
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General Information:
Output: Relay contacts – normally open (N/O), normally closed (N/C), and common (COM): The common
contact switches from the normally closed to the normally open contact at and above the trip point.
Output Rating (maximum): 1 amp @ 24 VDC resistive, 0.3 amp @ 24 VDC inductive (coil load)
IMPORTANT: If amp load exceeds the above amperage, an optional relay such as the R7021 is necessary.
Operating Voltage:
12 V units: 10-16 VDC
24 V units: 16-30 VDC
Reverse Voltage Protection:
12 V units: -12 VDC indefinitely, -400 V transients
24 V units: -24 VDC indefinitely, -400 V transients
Latch Option:
If latch option is specified, the output (after the trip point) will remain energized until the power is
removed from the unit for approximately 1 second.