The document discusses Dwyer Instruments' VBS vibration switch and VBT vibration transmitter. The VBS features an adjustable PNP solid state switch and time delay, while the VBT outputs vibration data as a 4-20 mA signal. Both products have NEMA 6 enclosures and operate within a 10-1000Hz frequency range suitable for monitoring motorized equipment. Guidelines are provided for setting alarm limits and using the VBS time delay to avoid nuisance alarms. Applications include fans, pumps, compressors and motors.

1. VBS and VBT
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customers and current employees as a resource only. They may not be reproduced, published,
or transmitted electronically for commercial purposes. Furthermore, the Company’s name,
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©Copyright 2011 Dwyer Instruments, Inc.

2. VBS Features
• Series VBS Vibration Switch
• Adjustable PNP solid state switch
• Adjustable switch time delay
• 4-20 mA output (10-1000Hz)
• M12 Electrical Connection (4 pin)
• NEMA 6
• Time delay and switch adjustments can be
locked.

3. VBT Features
• Model VBT-1Vibration Transmitter
• 4-20 mA output (10-1000Hz)
• All 316 SS housing (NEMA 6)
• Can be mounted in any position
• Temperature range from -22 to 221°F
• M8 and UNF ¼-28 mounting
thread(Both included)

4. Why 10 – 1000Hz Frequency Range
Typical components of a machine with
motor speeds between 600 and 3000rpm
will fall into this frequency band.

5. Alarm Limits Guidelines
Typical allowable vibration levels on most
types of equipment.

6. VBS Time Delay
• The VBS time delay can be used to
eliminate nuisance alarms.

7. Applications
• Fans and Blowers
• Pumps
• Compressors
• Electric motors
• Generators

8. Questions
To order a free catalog or for more information contact;
Dwyer Instruments, Inc., P.O. Box 373,
Michigan City, IN., 46361
Telephone: (800) 872-9141 or (219) 879-8000
Fax: (219) 872-9057
Internet address: www.dwyer-inst.com
E-mail: info@dwyer-inst.com