Manual

LT-10524-A

1 of 4

General Information

The FS30 is designed for use with any SeaMetrics flow

meter or flow sensor to activate a switch closure at a set

flow rate. Particularly suited for critical flows, it is called

an “active” flow switch because if it should fail it would

tend to fail in a false “no flow” condition, unlike vane-type

switches which easily fail in a false “flow” mode. The FS30

can be set to activate on rise or fall, and the set point is

input using rotary digital switches.

A variable hysteresis or deadband setting is provided to

accommodate varying amounts of turbulence in the flow

metering application. If the turbulence is significant, a

larger deadband keeps the switch from chattering on and

off when the flow is very close to the setpoint.

Specifications

Power 12 - 36 VDC

Flow Sensor Power 5 VDC, 20 mA

Output Form C relay, 10 A

@ 120 VAC or 28 VDC max

Setting Range 1 - 999 Hz

Accuracy 1 %

Hysteresis 1 - 10%

Modes High (close on rise),

low (close on fall)

Response Speed Switch (after 90% change)

Change rising 2.0 second

Change falling 3.0 second

Indicators Power on (green), switch (red)

Temperature 32º- 120ºF (0º- 5ºC)

FS30 Active Flow Switch

Instructions

DISCONTINUED

(12/31/06)

PAGE 1
Specifications 1/ General Information 06 ) DIS CO NT INU ED FS30 Active Flow Switch Instructions Power (1 2 /3 The FS30 is designed for use with any SeaMetrics flow meter or flow sensor to activate a switch closure at a set flow rate. Particularly suited for critical flows, it is called an “active” flow switch because if it should fail it would tend to fail in a false “no flow” condition, unlike vane-type switches which easily fail in a false “flow” mode.
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Installation The FS30 can be mounted directly on the flow sensor (“meter mount”) or remotely, fastened to a surface (“wall mount”). Deadband (Hysteresis). This adjustment sets the percentage that the flow must go above and below the setpoint before switching occurs. The purpose is to prevent erratic switch cycling if the flow is turbulent and very close to the setpoint. With the typical SeaMetrics flow sensor, 1 to 2% should be adequate.
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Features Setpoint - xxx DIS CO NT INU ED Hysteresis (Deadband) setting Power connection Form C relay output Connection to flow sensor /0 6) Set for high or low flow switching by moving jumper as shown Power Source NO FS30 Full manual at www.seametrics.
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Dimensions FS30 Sensor-Mount FS30 With Wall Mount Brackets FS30 ACTIVE FLOW SWITCH POWER 3.93" OUTPUT 2.57" DIS CO NT INU ED 2.06" Kent, WA www.seametrics.com 3.93" 2.78" (1 2 /3 1/ 06 ) 4.52" 4 of 4 20419 80th Ave. So., Kent, WA 98032 USA Phone: 253-872-0284 Fax: 253-872-0285 www.seametrics.