Seametrics FS20 User Manual download pdf

PUB 19128-1000

Page 1 of 2

FS20 Dual Flow Switch

Instructions

Designed to be used with a variety of SeaMetrics

meters, the FS20 signals when flow reaches critical

setpoints. Two setpoints are provided, a low and a high

setting. When flow falls below the low or rises above

the high, SPDT relay contacts close to actuate what-

ever alarms or controls are connected to them. Set-

ting is by means of DIP switches, and setpoints are in

pulses per minute. Output lights give visual indication

that flow limit has been reached.

Specifications

Power 115 VAC

Enclosure NEMA 4x, 5" x 7" polycar-

bonate

Relays SPST

Relay Rating 5 A resistive at 115 VAC

5 A at 24 VDC

Setpoint Range 1 - 33,000 pulses/

minute

Setpoint Hysteresis 6%

Sensor Power 25 mA at 12 VDC

nominal

Features

Mounting. To gain access to the mounting screw holes,

remove the front clear cover. Mounting screw holes

are at the four corners, under the cover screws. Mark

the centers of these holes, using the box or the en-

closed template, and drill. Finally, insert screws through

the corner holes and tighten.

Terminal Access. Terminals are on the back side of

the printed circuit board. Remove the front clear cover,

then remove the four front plate screws. Turn the printed

circuit board over to reach the terminals.

Connect Flow Meter. Bring the flow meter input cable

into the unit through the appropraite strain relief, then

connect following the Connections diagram. Either two-

wire (dry contact) or three-wire (solid state) flow meter

sensors can be used.

Connect Alarm Relay(s). Bring alarm output cable(s)

into the unit through the appropriate strain reliefs and

connect to relay outputs, as shown in the Connections

diagram. Note that depending on setting, relays may

energize when the unit is first powered up. If this

presents a hazard, disconnect any devices on the

other end of the cable(s) until settings have been

made and tested.

General Information

Installation

Input Indicator

High Flow Setting

Low Flow Setting

Power switch

and indicator

Cover screws

and box mounting

screw holes

strain relief

Power input cord

(6’ length)

Low flow

relay output

Internal 10 Amp

replaceable fuse

Output Indicators

OFF ON

MANUAL MANUAL

INC. KENT, WA

INPUT

LOW FLOW HIGH FLOW

FS20

FLOW SWITCH

OFF ON

16384

32768

8192

4096

2048

1024

512

256

128

Setting equals

the sum of

the switches

turned "ON".

Setting equals

the sum of

the switches

turned "ON".

High flow

relay output

Meter input

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Summary of Contents

Page 1 - DISCONTINUED

PUB 19128-1000Page 1 of 2FS20 Dual Flow SwitchInstructionsDesigned to be used with a variety of SeaMetricsmeters, the FS20 signals when flow reaches c

Page 2

SettingSee example diagram for method of setting. Note thatLow Flow energizes the relay when flow drops belowthe set point, and High Flow energizes w

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Seametrics FS20 User Manual

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