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Sensors for Monitoring Cooling Towers & HVAC Systems

Reliable and cost-effective vibration monitoring solutions
for cooling fans and other low frequency equipment

Cooling towers are a critical component of production in many industries today. Most towers use a horizontal electric motor driving a jack shaft into a right angle gearbox with vertical output to a large fan. Vibration monitoring of this drive train is essential to provide signals for early warning or provide shutdown when vibration levels exceed a predetermined threshold. The classic legacy solution involved the use of "earthquake" mechanical switches. These devices utilize a spring and magnet concept and are designed to mechanically trip during high vibration. Reliability becomes an issue with mechanical switches due to harsh cooling tower environments, especially in critical applications.

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Model Number

Model:640B01

  • Measurement Range: 0.0 to 1 in/sec pk
  • Measurement Range: 0.0 to 25.4 mm/s pk
  • Output: 4-20 mA
  • Output: 4-20 mA
  • Frequency Range: (±10%)180 to 60000 cpm
  • Frequency Range: (±10%)3 to 1000 Hz
$219.00 USD
(Pricing valid in US only)
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Model Number

Model:642A01

  • Measurement Range: 0.0 to 1.0 in/sec pk
  • Measurement Range: 0.0 to 25.4 mm/s pk
  • Output: 4-20 mA
  • Output: 4-20 mA
  • Frequency Range: (±10%)180 to 60000 cpm
  • Frequency Range: (±10%)3 to 1 kHz
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Model Number

Model:686C01

  • Relay: (Type)SPST, Form A or B MOSFET
  • Relay: (Type)SPST, Form A or B MOSFET
  • Power Required: 24 to 240 V DC/AC 50/60 Hz
  • Power Required: 24 to 240 V DC/AC 50/60 Hz
  • Electrical Connector: 2-Pin MIL-C-5015
  • Electrical Connector: 2-Pin MIL-C-5015
$430.00 USD
(Pricing valid in US only)
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Model Number

Model:EX686B71

  • Relay: (Type)SPST, Form A or B MOSFET
  • Relay: (Type)SPST, Form A or B MOSFET
  • Power Required: 24 to 240 V DC/AC 50/60 Hz
  • Power Required: 24 to 240 V DC/AC 50/60 Hz
  • Electrical Connector: Terminal Block
  • Electrical Connector: Terminal Block
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Model Number

Model:685A09

  • Measurement Range: 7 g pk
  • Measurement Range: 68.7 m/s² pk
  • Cable Input: 3/4-14 NPT
  • Cable Input: 3/4-14 NPT
  • Relay: 3A Form C 480 VAC
  • Relay: 3A Form C 480 VAC
  • Electrical Connector: Screw Terminals
  • Electrical Connector: Screw Terminals
$185.00 USD
(Pricing valid in US only)
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Model Number

Model:685B0011A13

  • Measurement Range: 0 to 1.5 in/sec pk
  • Measurement Range: 0 to 38.1 mm/s pk
  • Cable Input: Single 1/2 in. NPT Conduit Hub
  • Cable Input: Single 1/2 in. NPT Conduit Hub
  • Relay: (Alert)10 A, 245 VAC/30 VDC, Form C
  • Relay: (Alert)10 A, 245 VAC/30 VDC, Form C
  • Power Required: 24 VDC +/- 10%
  • Power Required: 24 VDC +/- 10%
  • Electrical Connector: Screw Terminals
  • Electrical Connector: Screw Terminals
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