⻬ HIGH or LOW Alarms
⻬ Compact Design
⻬ Liquid or Gas Applications
⻬ High or Low Flow Cutoff Applications
⻬ Dip Switch Configurable Buzzer,
Relay, and LED
The 150 mm high/low alarm flow meter with optical
sensor switch is a noninvasive means for detection of
a HI or LOW flow. This sensor is ideal for signaling an
alarm, cutoff valve, or other device when the float
passes the detector (alarm, valve, etc. not included).
The FLSW Series helps protect your processes and
equipment from damage caused by extreme flow
rates. Its compact design and ease of operation
make it a unobtrusive, simple-to-use addition to your
flow meter.
This meter is perfect for OEM®applications. Use
whenever maximum or minimum flow levels need to
be monitored automatically.
The FLSW Series also can be used in conjunction
with a control relay to power alternate equipment or
monitoring devices.
Principle of Operation
A small, LED sensor and receiver are mounted on
one side of the flow meter. The float inside the flow
tube is detected as it passes across the beam of light.
Sensor can be used to detect float passage beyond
the setpoint of the sensor. It can also be set to monitor
float position at a specific level, signalling when float is
outside of the range of the sensor light beam.
DIP Switches are located next the the 9-pin D
connector. In order to activate the alarm sensors the
corresponding switch has to be in the “ON” position
on the DIP switch. The relay output or the buzzer or
the green LED can be separately set for momentary
or latch operation. If for example DIP Switch SW1 is
set to “ON”, when the left sensor is active, the relay
and the green LED will be energized in the latch
mode. It will remain latched until the RESET button is
pressed or external RESET TTL signal is applied.
Alarm DIP Switch Configuration
Left Right Action When
Alarm Alarm Switch is “ON”
SW1 SW5 LED and Relay are ON (Latch)
SW2 SW6 Buzzer is ON (Latch)
SW3 SW7 LED and Relay are ON
momentarily (Follow Sensor)
SW4 SW8 Buzzer is ON momentarily
(Follow Sensor)
FLSW3405ST rotameter, $550
and FLTR-1 tripod, $48, shown
smaller than actual size.
FLSW Series
Starts at
$
550
Optional
†
ROTAMETER WITH ALARM
B-X
B-X
B1
Wire Diagram for FLSW
(9-Pin D-Connector)
Model No. Price Description
FMA178PW $40 Socket plug-in power supply for 115 Vac
FMA178PW-220VAC 57 Socket plug-in power supply for 220 Vac, VDE plug type
FLTR-1 48 Tripod for one rotameter, 177.8 mm (7") L and 9.53 mm (0.375") thick
70A-1 18 Audible alarm
FW-331 155 Reference Book: Analytical Instrumentation
To Order
(Specify Model Number)
Model No. Model No. Model No. Max Flow Max Flow
Model No. Stainless High Res Valve HIgh Res Valve Air Water
Aluminum Price Steel Price Aluminum Price Stainless Steel Price ml/min ml/min
FLSW3401G $550 FLSW3501G $685 FLSW3401G-HRV $600 FLSW3501G-HRV $786 49 0.49
FLSW3402G 550 FLSW3502G 685 FLSW3402G-HRV 600 FLSW3502G-HRV 786 92 0.9
FLSW3403ST 550 FLSW3503ST 685 FLSW3403ST-HRV 600 FLSW3503ST-HRV 786 264 4.7
FLSW3404G 550 FLSW3504G 685 FLSW3404G-HRV 600 FLSW3504G-HRV 786 374 5.5
FLSW3405ST 550 FLSW3505ST 685 FLSW3405ST-HRV 600 FLSW3505ST-HRV 786 814 20.4
FLSW3406ST 550 FLSW3506ST 685 FLSW3406ST-HRV 600 FLSW3506ST-HRV 786 1682 44.6
FLSW3407G 550 FLSW3507G 685 FLSW3407G-HRV 600 FLSW3507G-HRV 786 2313 54
FLSW3408G 550 FLSW3508G 685 FLSW3408G-HRV 600 FLSW3508G-HRV 786 4562 133
FLSW3409ST 550 FLSW3509ST 685 FLSW3409ST-HRV 600 FLSW3509ST-HRV 786 7825 217
FLSW3410ST 550 FLSW3510ST 685 FLSW3410ST-HRV 600 FLSW3510ST-HRV 786 16737 506
FLSW3411G 560 FLSW3511G 695 FLSW3411G-HRV 610 FLSW3511G-HRV 796 23742 541
FLSW3412ST 560 FLSW3512ST 695 FLSW3412ST-HRV 610 FLSW3512ST-HRV 796 45227 1288
FLSW3413T 597 FLSW3513T 732 FLSW3413T-HRV 647 FLSW3513T-HRV 833 69940 2000
†
For NIST calibration, add suffix “-NIST AIR” to model number and $225 to price or suffix “-NIST WATER” to model number and $275 to price.
For oxygen cleaning add suffix “-02CLEAN” to model number and $125 to price.
Comes complete with operator’s manual.
Ordering Examples: FLSW3405ST, aluminum rotameter, maximum air flow 814 ml/min and maximum water 20.4 ml/min, $550.
FLSW3413T, aluminum rotameter, maximum air flow 69940ml/min and maximum water 2000 ml/min, $597.
Accessories
MOST POPULAR MODELS HIGHLIGHTED!
SPECIFICATIONS
Accuracy: ±2% of full scale
Repeatability: 0.5% of full scale
Ambient Temperature: 0 to 70°C
(32 to 158°F)
Maximum Pressure: 200 psig
Connections:
1
⁄8 FNPT
End Blocks: Aluminum or 316
Stainless Steel
Elastomers: Buna and FKM
(Aluminum), FKM (316SS)
Tube: Borosilicate
Float Materials: “G” for Glass or “ST”
for 316 SS or “T” for Tantalum (noted in
model number)
Input Power: 12 Vdc, 15 Vdc
maximum, 250 mA regulated,
peak to peak maximum 100 mV
Power Consumption:
Less than 200 mA
Response Time: 500 milliseconds
Source of Light: 65 mm, red LED
Light Immunity: Pulse modulated
Dry Contact Closures: 2 normally
open, and normally closed relays 91A,
30 Vdc max)
Alarm Options: High, Low or High/Low
Buzzer: User configurable, momentary
or latch through DIP switch setting
Reset: Reset
button or remote
through “D”connector, to
disable relay or
buzzer
Interface: 9-pin
“D”-connector
Optional: 12 Vdc
power supply,
tripod base
Panel Mount Installation
Dimensions: mm (inches)
Dimensions:
Alarm Electronics Enclosure:
51.1 x 76.2 mm (2.01 x 3.00")
Enclosure #2 with Phone Plug:
30.5 x 14.2 mm (1.2 x 0.6")
47
(1.85)
open
Dimensions show flowmeter side view.
Face width (not shown) is 32 mm
(1-1/4"). Use center line dimensions
for drilling panel.
28.6
(1.13)
Center
Line
249.2
(9.8)
150 mm size
12.7
(0.50)
13.9
(0.55)
9.5
(3/8) maximum
panel thickness
Drill two 5/8" holes to fit inlet and outlet.
Maximum panel thickness is 9.5 mm (3/8").
Use the two retaining nuts supplied
to secure flowmeter.
15
(0.59) open
15
(0.59) open
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