ISSPRO R8522 - Manual

ISSPRO, INC. 2515 N.E. Riverside Way, Portland OR 97211
Telephone: (503) 288-4488 Š Toll Free: (800) 888-8065
FAX: (503) 249-2999
Form No. IS007 (12/13/99 Rev. B) Page 1 of 2
ISSPRO Digital Tachometers P/N R8521 & R8522 (Old P/N 2721,2)
Sender Unit(s) P/N R8332, R8333 (Old P/N R8331,2731,2,3)
General Information:
Power Requirements: 10-16 VDC @ 350 mA (4.2 W)
Input Signal: ISSPRO noise canceling signal only
Protected against reverse power connection and voltage transients
Range: R8521: 9990 RPM (10 RPM increments)
R8522: 9999 RPM (1 RPM increments)
Error: R8521= +/- 10 RPMs
R8522= +/- 1 RPM
Display update time: 1 second
Photo sensor detects ambient light conditions and adjusts display brightness accordingly.
Calibration:
There is no calibration adjustment on either the R8521/R8522 Tachometer or the R8332/R8333 sender.
Accuracy is maintained by a crystal controlled oscillator in the tachometer. Three sender ratios are available as
described below:
The R8332 sender is manufactured to produce either 1:1 or 2:1 reading when used with the R8522
tachometer. This feature is useful in applications where the sender is driven at ½ engine speed (i.e. fuel pump
drives). Leaving the red wire loop on the sender uncut provides a 2:1 reading. To produce a 1:1 reading, cut the
loop.
The R8332 produces a reading of ½ of the driven speed. An example of this application is a blower drive
which is running at twice the engine speed.
Sender Drive Speed Correct Sender
1) ½ engine speed R8332… wire loop uncut* (old P/N R8331)
2) engine speed R8332… wire loop cut*
3) 2 X engine speed R8333… wire loop uncut*
*Refer to wiring diagram on reverse side.