EMS - Industrial Sensors and Controls
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| 1-800-5140-EMS (367) | Economical Solutions - Reliable Products - Personal Service |
| Speed (RPM) Transmitter
programmable factory programming available - $25 |
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$50 |
buy |
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| Current Loop output
Works with NPN or PNP prox sensors |
| FEATURES | |
| Three wire current loop (4-20 mA) output | |
| 10 - 5000 RPM range | |
| Low cost speed measurement for PLCs and control systems | |
| Works with PNP or NPN proximity sensors | |
| Programmable set 4-20mA output for desired speed range | |
| Reverse polarity protected | |
| 3.5mA output for Zero Speed condition (no pulses for over 10 seconds) |
| THEORY OF OPERATION |
| The
Speed Monitor requires a source of electronic pulses from a sensor. The
timing of the pulses is calculated by a microprocessor. The microprocessor
takes previously programmed information (such as the number of pulses per
revolution) and scales the output to drive a 4-20mA output signal. The
Speed Sentry allows the output to be programmed for a range that is
significant to the user. For example if a user is only interested in a
range of 100-500 RPM, the Speed Sentry can be scaled so that 4ma = 100RPM and 20mA
=500RPM
The Speed Sentry can be factory programmed or programmed by the user with the USB programming accessory and a Hyper terminal software utility like Windows Hyper Terminal or the free Real Terminal program. |
| BLOCK DIAGRAM |
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| APPLICATIONS | ||
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The use of an NPN or PNP proximity sensor is a common way to measure rotational speed using gear teeth. | |
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A laser ranging sensor can be used to detect irregular surfaces such as a bevel gear teeth. | |
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A hose clamp can be used with a proximity sensor to produce pulses from shaft rotation. | |
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Many liquid flow sensors produce pulses proportional to the volume of fluid such that a flow rate can be calculated for process control. | |
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While the major use of the Speed Sentry is rotational (RPM) speed measurement, even a linear source of pulses can be used to provide a measurement system an indication of process speed and rate. | |
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Weather measurement devices such as an anemometer also often provide a pulse stream that is proportional to speed. |
| MECHANICAL | |
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| WIRING | |
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| SPECIFICATIONS | SPD101 |
| RANGE | 10 to 5000 RPM |
| POWER | +24VDC @ 100mA |
| ACCURACY | +/- 1% |
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OUTPUT |
Current loop (4-20mA) three wire |
| HOUSING | PVC IP34 |
| ITEM |
PART NUMBER |
PRICE |
| Transmitter | SPD101 | $50 |
| USB Program Cable | USB35MM | $30 |
| Factory Programming | SPD101-PGM | $25 |
Part Number SPD101
| Design considerations
The Speed Sentry is a low cost way to convert speed and rate information into an analog 4-20mA output for a PLC, process control meter, distributed control system (DCS), or other industrial control system. The Speed Sentry should not be used as the sole sensing element in critical equipment or safety applications.
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EMS 47745 - 193rd St. Toronto SD 57268 USA (605) 794-2072 (P) (605) 794-2073 (F) email