Control Resources, Inc., TACHSTRIP Fan speed alarm

CRI Catalog and Design Guide Section
View TachStrip Fan Speed Alarm Installation & Operation Manual in PDF


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 TachStrip Fan speed alarm

SmartFan TachStrip is a modular fan speed alarm
that accepts tachometer (Hall Effect) pulses from DC
or AC fans or blowers. TachStrip monitors these pulses
and generates failure alarms if air mover speed drops
below a preset trigger speed. TachStrip comprises a
strip of 6 individual alarm units bused together. The
web separating units can be cut to provide strips to
 

handle any quantity of fans.Each unit monitors one
air mover and provides alarm outputs for that air
mover. The bus distributes power to each unit
and OR’s alarm signals from each unit to provide
a single alarm output if any air mover should fail.
Each alarm unit has three outputs used to drive
a logic circuit, LED, or piezo alarm.

For Application and Design Information See:

 Features
  • Accepts open collector or voltage source pulses from nearly any DC
    or AC fan or blower.
  • 6 alarm unit strips are easily separated to monitor any quantity
    of fans.
  • Distributes power to DC air movers through same connector used
    to sense pulses.
  • Separate alarm outputs are provided for each fan
  • Alarm channels are OR’d providing a single alarm if any fan fails.
  • Trigger Speed is adjustable by jumper to 1500, 2500, or 4000 PPM.
  • Permissible power supply voltage is 5.0 VDC minimum to 25.0
    VDC maximum.

Normally Closed (NC) Alarm Output Closed above trigger speed and will sink
4 mA at 0.4 VDC or less.  Open below trigger speed and will accept up to 30
VDC. Referenced to fan negative  terminal. Applies nominal 12 mA to an LED
connected from NC to L. 

Normally Open (NO) Alarm Output Open above trigger speed and will accept
up to 30 VDC. Closed below trigger speed and will sink 4 mA at 0.4 VDC or less.
 Referenced to negative fan terminal. Applies nominal 12 mA to an LED
connected from NO to L. Applies nominal power supply voltage to piezo
alarm connected  from NO to P. 

OR’d (OR) Alarm Output OR’d with all other alarm units in TachStrip.
Other characteristics identical to NO alarm output.
 Specifications

Part Number

Supply Voltage Range

Alarm Units Per Strip

015B125
015B625

5 to 25 VDC

1
6

H1091

Hardware Pack


Note:  Maximum operating temperature is 65°C
1per alarm unit.

To view installation and operation instructions:
View TachStrip Fan Speed Alarm Installation & Operation Manual in PDF


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Control Resources Incorporated
11 Beaver Brook Road
Littleton MA, 01460 USA
Tel: 978-486-4160
Fax: 978-486-4772
email: sales@controlres.com