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Example below shows the speed information for 150 RPM:
This example has an INPUT FREQUENCY RANGE of 0.166 Hz to 2.50 Hz. By installing 1
(one) target on the roller or shaft, the following formula can be used to convert to RPM’s:
INPUT FREQUENCY * 60 = RPM
Examples: 0.166 Hz * 60 = 9.96 RPM
1.33 Hz * 60 = 79.80 RPM
2.50 Hz * 60 = 150.00 RPM
This example unit has a factory set span of 2.334 Hz (2.50 Hz - 0.166 Hz). Multiplying 2.334
Hz * 60 will give the span in RPM’s.
2.334 Hz * 60 = 140.04 RPM
Dividing 140.04 / 160 will give the RPM resolution for each .1mA increment.
140.04 / 160 = 0.87 RPM per .1mA output
By adding additional targets to the roller or shaft, a lower RPM range can be obtained. The
following examples will show how to calculate the speed range for 4 (four) targets.
INPUT FREQUENCY * 60 / 4 TARGETS = ACTUAL RPM
Examples: 0.166 Hz * 60 / 4 = 2.49 RPM
1.33 Hz * 60 / 4 = 19.95 RPM
2.50 Hz * 60 / 4 = 37.50 RPM
CONCLUSION: By changing the number of targets on the roller or shaft, different speed
ranges can
be obtained from the same model.
Examples: 1 Target = 9.96 RPM to 150.00 RPM
2 Targets = 4.98 RPM to 75.00 RPM
4 Targets = 1.77 RPM to 37.50 RPM
Specification - 37545 Smart Monitor 120VAC 4029mA output
• AC Input: 90-140 VAC 50/60 Hz @ 6 W
• Fuse Protected: 1 amp
• Output: Proportional 4-20mA D. C.
• Linearity: Better than 1%
• Accuracy: Better than 1%
• Repeatability: Better than 5%
FIGURE A5.3: 37543 Smart Monitor dimensions.
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