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S-Series
Low Flow Meter
Instructions
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SPT
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TABLE OF CONTENTS S-SERIES INSTRUCTIONS
General Information
General Information ...................................................................................................................................................Page 3
Features ..........................................................................................................................................................................Page 3
Specications ................................................................................................................................................................Page 4
Dimensions ....................................................................................................................................................................Page 4
Flow Range .....................................................................................................................................................................Page 4
Pressure Drop Curve ...................................................................................................................................................Page 5
Installation & Connections
Piping Requirements ..................................................................................................................................................Page 5
K-Factor ...........................................................................................................................................................................Page 5
Connections to Non-Seametrics Control Devices ..........................................................................................Page 5
Repair
Rotor Replacement .....................................................................................................................................................Page 6
Sensor Replacement ...................................................................................................................................................Page 6
SPX/SPT Parts List ........................................................................................................................................................Page 7
Troubleshooting
Problem ...........................................................................................................................................................................Back
Probably Causes ...........................................................................................................................................................Back
Things to Try ..................................................................................................................................................................Back
Seametrics • 253.872.0284 Page 2 seametrics.com
GENERAL INFORMATION
S-SERIES INSTRUCTIONS
These versatile impeller owmeters are availalble in 3/8”,
1/2”, 3/4”, and 1” nominal pipe sizes with female NPT
threads. They employ jewel bearings to allow for very low
minimum ow rates and superior life.
The SPX, with a body of polypropylene, is an economical
choice for metering water or low corrosion uids. The lens
cover is available in a choice of materials: acrylic for visual
ow indication of low-corrosion uids; polypropylene
when more corrosion resistance is needed. The standard
rotor assembly is Kynar® with tungsten carbide shaft. The
O-ring is EPDM.
Features
18’ Sensor Cable
Thread-in Sensor, Field Replaceable,
6–24 Vdc Pulse
Standard Acrylic Top with Clear
Removable Lens Assembly
(optional polypropylene top
without clear lens)
The SPT offers greater chemical resistance with a Teon®
body and cover, Teon®-coated Viton® O-ring, and standard
Kynar®/ceramic rotor assembly.
The pulse output of these meters is compatible with
many different types of controls, including a full range of
Seametrics rate displays and controls. The Seametrics FT430
and FT440 provide ow rate and total ow indication. The
FT440 also includes 4-20 mA output capability. The FT450 is
a battery-operated rate & total display. For metering pump
pacing or interfacing with low speed counters, the PD10
pulse divider is recommended. The AO55 may be used for
blind 4-20 mA transmission.
Hex Screws
Female NPT Ports
Polyproylene Body
Internal
• Jewel Bearings—Ruby Ring and Ball
• Kynar®/Tungsten Carbide Rotor Assembly (Kynar®/Ceramic or
Kynar®/Silicon Carbide optional)
• EPDM O-Ring (Viton® or Teon®-coated Viton® optional)
18’ Sensor Cable
Thread-in Sensor, Field Replaceable,
6–24 Vdc Pulse
Teon® Body and Top
Screws with Hex Nuts
Female NPT Ports
Internal
• Jewel Bearings—Ruby Ring and Ball
• Kynar®/Ceramic Rotor Assembly (Kynar®/Silicon Carbide
optional)
• Teon®-coated Viton® O-Ring (Viton® or EPDM optional)
SPX
SPT
Seametrics • 253.872.0284 Page 3 seametrics.com
GENERAL INFORMATION
0
5
10
15 20 25 30 35
10
15
20
S-SERIES INSTRUCTIONS
Specications*
SPX SPT
Connection Ports 3/8”, 1/2”, 3/4”, 1” —Female NPT thread 3/8”, 1/2”, 3/4”, 1” —Female NPT thread
Sensor Cable 18 ft (6 m) standard—maximum cable run 2000 ft
(607 m)
Materials Body Polypropylene TFE Teon
Rotor PVDF (Kynar®)—2 magnet
(6 magnet high resolution optional)
Shaft Nickel tungsten carbide
(ceramic or silicon carbide optional)
18 ft (6 m) standard—maximum cable run 2000 ft
(607 m)
®
PVDF (Kynar®)—2 magnet
(6 magnet high resolution optional)
Zirconia ceramic
(silicon carbide optional)
O-Ring EDPM (Viton® or Teon®-coated Viton® optional) Teon®-coated Viton® (Viton® or EDPM optional)
Bearings Ruby ring and ball Ruby ring and ball
Cover Acrylic with clear lens
TFE Teon
®
(polypropylene without clear lens optional)
Maximum Temperature 160˚ F (70˚ C) 180˚ F (82˚ C)
Maximum Pressure 150 psi (10 bar) 150 psi (10 bar)
Accuracy ±1% of full scale ±1% of full scale
Power Standard 6–36 Vdc, 2 mA min. 6–36 Vdc, 2 mA min.
Micropower 3.1–16 Vdc (for use with FT450 and DL76 only) 3.1–16 Vdc (for use with FT450 and DL76 only)
Outputs Current sinking pulse, 6–24 Vdc Current sinking pulse, 6–24 Vdc
* Specications subject to change. Please consult our website for current data (seametrics.com)
Kynar is a registered trademark of Arkema, Inc., Teon and Viton are registered trademarks for DuPont Corporation
Dimensions
2.25 (SPT)*
2.10 (SPX)
*NOTE:
SPT cover screws
are not recessed
Model # NPT Thread Size
-038 3/8”
-050 1/2”
-075 3/4”
-100 1”
1.20
4.10
18 Ft. Cable
(standard)
2.20
1.625
Female NPT
thread size varies
with model #.
See chart below
Flow Range Pressure Drop Curves
Model #
*Nominal K-factors (based on averages) for standard 2-magnet SPT and
SPX. High resolution (6-magnet) K-factors are approximately tripled.
K-Factor* (pulses/gal)
SPT SPX
-038 1394 1417 0.07–5 0.27–18.9
-050 634 658 0.1–10 0.38–37.9
-075 476 468 0.2–20 0.75–75
-100 250 254 0.5–40 1.9–150
Gal/Min Liter/Min
5
Pressure Drop (PSI)
3/8"
1/2"
3/4"
Flow (GPM)
1"
Seametrics • 253.872.0284 Page 4 seametrics.com
INSTALLATION & CONNECTIONS
Red
White
Black
Signal
+
DC Voltage
Ground
Input Designed for Current
Sinking (NPN) Devices
Input Designed for Current
Sourcing (PNP) Devices
2.2K Ohm Pull-up
Resistor
Input Designed for Current
Sourcing (PNP) Devices
S-SERIES INSTRUCTIONS
INSTALLATION
Piping Requirements
Standard ttings are female NPT. If the piping connected
to the meter is metallic, care should be taken not to
overtighten. Straight pipe of at least ve diameters
upstream of the meter is recommended. Vertical or
horizontal installations are acceptable.
WARNING:
This meter has low-friction bearings. Do
not at any time test operation of the meter
with compressed air. Doing so will subject
it to rotational speeds many times those
for which it was designed, and will certainly
damage the rotor, shaft, and/or bearings.
K-Factor
The meter is factory calibrated. The K-factor is found on
the label on the meter body and must be input into the
control/display for accurate reading.
CONNECTIONS
Connecting to Non-Seametrics Control Devices
It is often desirable to connect an SPX/SPT ow sensor to
a PLC or industrial computer board, and the sensors are
well suited for this. Typically it can be connected directly,
or with a single resistor added. The pickup sensors are
current sinking (NPN) GMR devices that require 6–36 Volts
DC and 2 mA current. They can connect directly to a PLC
or computer board if:
1. The sensor power supply on the PLC is 6–36 Vdc (24
Vdc is typical).
2. The sensor power supply can provide at least 2 mA
(100 mA is typical).
3. The sensor input on the PLC can accept a current
sinking device.
4. The PLC frequency response > ow meter output
frequency.
Red
White
Black
+
DC Voltage
Signal
Ground
Seametrics • 253.872.0284 Page 5 seametrics.com
K-factor on label
NPN Device NPN Device
Input designed for current sinking devices (NPN)
If the PLC input only accepts current sourcing devices, a
pull-up resistor must be added. Typically, on a 24 Vdc input
a 2.2 K Ohm resistor will be effective.
2.2K Ohm Pull-up
Resistor
NPN Device PNP Device
Red
White
Black
+
DC Voltage
Signal
Ground
Input designed for current sourcing (PNP) devices
Since the three-wire pickup sensors are solid state, they
do not exhibit switch bounce and can be used at relatively
high frequencies.
If the PLC is equipped with a 4-20 mA analog input module,
it is necessary to order the S- Series ow sensor with some
form of 4-20 mA transmitter. Two options are the AO55
blind transmitter and the FT440 indicating transmitter.
Follow the connection diagrams for these products to
connect to the analog input.
REPAIR
S-SERIES INSTRUCTIONS
Rotor Replacement
There is only one moving part to this meter. The bearings
are made of ruby, which rarely wears out or needs
replacement unless they have been physically damaged by
severe shock. The shaft is integrally molded into the rotor,
and shaft and rotor are replaced as one part. (You may wish
to replace the bearings, using the bearing removal tool,
while the meter is disassembled for rotor replacement). To
replace the rotor, disconnect the meter and remove the
four screws that hold the cover in place. Lift the cover and
remove the rotor (see parts diagram below).
When putting in the new rotor, be sure that the ends of
the shaft are in both bearings before tightening the cover.
The rotor can be easily dropped into the bottom bearing.
Starting the shaft into the upper bearing requires a bit of
care. It is easier if the rotor is spinning, which can be done
by lightly blowing into a port. When the upper bearing
plate drops into place, hold it down and check for free
spinning (by blowing lightly) before replacing the cover.
Check that the O-ring is in its seat on the bearing plate
before replacing the cover. Replace the cover, insert the
four cap screws and tighten.
Sensor Replacement
The sensor ordinarily does not need replacement unless it is
electrically damaged. If replacement is necessary, unscrew
the sensor by hand. Screw the replacement sensor in and
tighten by hand.
Reconnect the sensor according to the diagram below.
(BLACK) Power (-)
(WHITE) Signal
(RED) Power (+) 6-24 Vdc
Seametrics • 253.872.0284 Page 6 seametrics.com
REPAIR
SPX/SPT Parts List
1 Body -038 100221 100269
2 Flow direction Label 100256 100256
3 Bearing Assembly (includes 2) 103313 103313
4 Rotor with Shaft
5 O- Ring EPDM 100264 (standard) 100264 (optional)
6 Cover (after 5/2005)
7 Cover Screws (4 required)
8 Sensor Standard 100419 100419
Kynar is a registered trademark of Arkema, Inc., Teon and Viton are registered trademarks for DuPont Corporation
S-SERIES INSTRUCTIONS
2
3
4
5
3
6
1
7
8
SPX SPT
-050 100222 100268
-075 100223 100267
-100 100224 100266
Bearing Removal Tool (not shown) 100372 100372
Kynar®/Ceramic (2 magnet) 103930 103930
Kynar®/Carbide (2 magnet) 103931 n/a
Kynar®/Silicon Carbide (2 magnet) 103933 103933
Kynar®/Ceramic (6 magnet, high res) 100453 100453
Kynar®/Carbide (6 magnet, high res) 103932 n/a
Kynar®/Silicon Carbide (6 magnet, high res) 103934 103934
®
Viton
Teon®-coated Viton
®
Polypro 100849 Not available
Acrylic 100848 Not available
®
Teon
Hexscrew 100310 Not applicable
Screw (requires hex nut 100025) Not applicable 100022
Hex nut (requires screw 100022) Not applicable 100025
Micropower 100508 100508
100219 (optional) 100219 (optional)
100973 (optional) 100973 (standard)
Not available 100847
Seametrics • 253.872.0284 Page 7 seametrics.com
TROUBLESHOOTING
Problem Probable Cause Things to Try...
No signal after installation Insufcient ow Consult Flow Rate Chart
Reduce pipe size or use different sensor
S-SERIES INSTRUCTIONS
Bad connections to control
electronics
Incompatible control Use 6–36 Vdc power supply - for low power
Damaged or missing rotor Remove ow sensor from tting and check for free
Failed magnetic sensor Replace magnetic sensor
Inaccurate metering Not enough straight pipe
between meter and severe ow
disturbance
Wrong K-Factory entered Check tting for K-Factor, check indicator to see
Check connections at control:
Red (+), Black (-), White (signal)
Use 3.1–16 Vdc power supply - for micropowered
Add pull up resistor, if using current-sourcing
device
spinning; replace rotor
Move meter away from ow disturbance or eld
calibrate
if it is entered properly ("Set K" on FT430, FT440,
FT450, or FT520)
Magnetic sensor failing to pick up
each blade
Remove ow sensor from pipe. If indicator is
FT430, FT440, FT450, or FT520, set K to 1.00, turn
rotor slowly by hand, indicator should cound each
blade; replace sensor
Wrong time units on ow
indicator
Seametrics • 19026 72nd Avenue South • Kent, Washington 98032 • USA
(P) 253.872.0284 • (F) 253.872.0285 • 1.800.975.8153 • seametrics.com
If using FT430, FT440, or FT520, check left side of
display (sec, min, hr, day); change to desired unit
LT-65200067r1.2 20161116
11/16/16
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