115 VAC. Enclosure. NEMA 4x, 5" x 7" polycar- bonate. Relays. SPST. Relay
Rating ... connect to relay outputs, as shown in the Connections diagram. Note
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FS20 Dual Flow Switch Instructions Installation
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 whatever alarms or controls are connected to them. Setting is by means of DIP switches, and setpoints are in pulses per minute. Output lights give visual indication that flow limit has been reached.
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 enclosed template, and drill. Finally, insert screws through the corner holes and tighten.
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General Information
Specifications Power Enclosure
Relays Relay Rating
Setpoint Range
Setpoint Hysteresis Sensor Power
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 twowire (dry contact) or three-wire (solid state) flow meter sensors can be used.
115 VAC NEMA 4x, 5" x 7" polycarbonate SPST 5 A resistive at 115 VAC 5 A at 24 VDC 1 - 33,000 pulses/ minute 6% 25 mA at 12 VDC nominal
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.
Features
Power switch and indicator
Low Flow Setting
High Flow Setting
OFF ON OFF ON
L O W
INPUT
Input Indicator
OFF
1 2 4 8 16 32 64 128
Setting equals the sum of the switches 256 turned "ON". 512 1024 2048 4096 8192 16384 32768
F L O W
FS20
FLOW SWITCH
LOW FLOW
ON
1 2 4 8 16 32 64 128
H I G H
Setting equals the sum of the switches 256 turned "ON". 512 1024 2048 4096 8192 16384 32768
F L O W
HIGH FLOW
MANUAL
Cover screws and box mounting screw holes
MANUAL
Output Indicators
INC. KENT, WA
Internal 10 Amp replaceable fuse Meter input strain relief
Power input cord (6’ length)
Low flow relay output
High flow relay output
PUB 19128-1000 Page 1 of 2
FS20 Connections Diagram
DRY CONTACT TYPE METER (MR,WPR)
GND SIGNAL
SOLID STATE TYPE METER (ME,IP,WT)
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GND SIGNAL +12 VDC
Hot Neutral Ground
EXTERNALLY-PACED METERING PUMP
NO NC N G
NO NC N G
PUMP+
GND SIGNAL
110 VAC Input
Normally Open Normally Closed Common Unused
High Flow Relay
Unused Common Normally Closed Normally Open
SOLID STATE TYPE METER (ME,IP,WT)
+12 VDC
Low Flow Relay
Setting
See example diagram for method of setting. Note that Low Flow energizes the relay when flow drops below the set point, and High Flow energizes when it rises above the set point.
Connect Power. If using the power cord provided, wait to plug it in until after the front panel has been replaced. Terminal connection is only necessary for conduit installations. Remove the power cord provided and connect power, following the Connections diagram. Do not energize the circuit until the front panel has been replaced.
Example: The meter produces 50 pulses per gallon. Low-flow relay output is desired at 20 gallons per minute. 50 pulses/gallon X 20 gallons per minute = 1,000 pulses/minute Set Low Flow to 1,000.
Set Trip Points. The DIP switches under the front clear cover are used to set trip point frequencies. Example
Replace Front Panel. Reverse the removal procedure.
OFF
1000 Pulses per minute
Determine Trip Points. Trip point frequencies are in pulses per minute. To calculate, multiply the pulses per gallon provided by the meter (“K-factor”) by the gallons per minute at which the alarm output is desired.
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20419 80th Ave. So., Kent WA. 98032 USA Phone: 253-872-0284 Fax: 253-872-0285 www.seametrics.com 1-800-975-8153
L O W
F L O W
ON
1 2 4 8 16 32 64 128
256 512 1024 2048 4096 8192 16384 32768
Setting equals the sum of the switches turned "ON".
