Seametrics S Series User manual

LT-10624A
Page 1 of 2
Specifications
S-Series (SPX, SPT)
Low Flow Meter Instructions
General Information
These versatile impeller flowmeters in 3/8" to 1"
nominal pipe size employ jewel bearings for very low
minimum flows. The 6-24 VDC pulse output of these
meters is compatible with many different types of
control, including a full range of SeaMetrics rate displays
and controls. The SeaMetrics FT420 provides flow rate
and total flow, with 4-20 mA ouput. For metering pump
pacing or interfacing with lowspeed counters, the PD10
divider is recommended. The AO55 is a blind 4-20mA
transmitter.
S-Seriesmetersareavailablein3/8"to1"nominalsizes.
The SPX body material is polypropylene, with transpar-
ent acrylic covers for visual flow indication.
Polypropylene covers are available as an option.
The SPT is available standard with TFE housing, TFE
cover, PVDF rotor, ceramic shaft, choice of o-ring
material (EPDM or Viton), and optional silicon carbide
shaft.
Connections 3/8", 1/2", 3/4", 1"
Female NPT standard,
SAE thread optional
Materials
Body SPX: Polypropylene,
SPT: TFE
Cover SPX:Acrylic,Polyprooptional
SPT: TFE
Rotor PVDF
Shaft SPX:Nickeltungstencarbide,
zirconia ceramic optional
SPT:zirconia ceramic, silicon
carbide optional
Bearings Ruby
Max. Temperature 160°F (70°C)
Max. Pressure 150 PSI (10 bar)
Accuracy ±1% FS
Flow Rates
Size GPM LPM
3/8" 0.07 - 5 0.27 - 18.9
1/2" 0.1 - 10 0.38 - 37.9
3/4" 0.2 - 20 0.75 - 75
1" 0.5 - 40 1.90 - 150
Features
18 ft. standard cable
Standard acrylic top
provides sight flow
indication
3/8"-1" NPT ports
machined into body
Kynar rotor
Jewel bearings
for superior wear
and flow range
Removable thread-in
sensor 12 VDC pulse
ARCHIVED

PipingRequirements.Standard fittings arefemaleNPT.
If the piping connected to the meter is metallic, care
should be taken not to overtighten. Straight pipe of at
least five diameters upstream of the meter is recom-
mended. Vertical, horizontal, or inverted (lens down)
installations are all acceptable.
Repair
Rotor Replacement. There is only one moving part to
thismeter. Thebearingsaremadeofruby,whichrarely
wears out, and will not need 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. To replace the rotor,
remove all pressure from the meter. Then remove the
fourscrews which hold thelens (or cover) inplace. Lift
the lens, then remove the rotor. When putting in the
new rotor, be sure that the end of the shaft is started
into the bearing before the lens is put into place.
When putting on the lens, be sure that the shaft is
also started into the upper bearing before lower-
ing the lens into place. If any resistance is met
when the lens is replaced, the shaft is not started
into one of the bearings. Check that the lens o-
ring is also in place, then replace the four screws
and tighten.
Sensor Replacement. The sensor ordinarily doesnot
need replacement unless it is electrically damaged. If
replacement is necessary, unthread the sensor by
hand. Thread the replacement sensor in and tighten
by hand.
Installation
Field Replacement of Sensor
2 of 4
(BLACK) Power (-)
(WHITE) Signal
(RED) Power (+) 6-24 VDC
SPX sensor connection
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.
Electrical Connections. There are three conductors to
the sensor, two for positive and negative power and one
for the signal. See the diagram below for color coding.
K-factor on
model/serial
label on back
Nominal K-factor
ARCHIVED

It is often desirable to connect an S-Series flow sen-
sor to a PLC or industrial computer board, and the
sensorsare well suited for this.Typicallyit can be con-
nected directly, or with a single resistor added.The S-
Series pickup sensors are GMR devices which need
5-24 Volts DC and 2 mA current, and they are current
sinking (NPN).
These sensors can connect directly to a PLC or com-
puter board if:
1. The sensor power on the PLC is 5 - 24 VDC (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.
See Figure 1 for connections.
IfthePLCinputonlyacceptscurrentsourcingdevices,
a pull-up resistor must be added. Connection of this
resistor is shown in Figure 2. Typically, on a 24 VDC
input a 2.2 K Ohm resistor will be effective.
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 flow sensor with
some form of 4-20 mAtranmitter.Two options are the
AO55 blind transmitter and FT420 indicating trans-
mitter.Follow the connection diagrams for these prod-
ucts to connect to the analog input.
Red
White
Black
Red
White
Black
Signal
+DC Voltage
Ground
Signal
+DC Voltage
Ground
Figure 1 Figure 2
Input Designed for Current
Sinking (NPN) Devices Input Designed for Current
Sourcing (PNP) Devices
2.2k Ohm Pull-up
Resistor
NPN
Device
NPN
Device
3 of 4
Connecting to non-SeaMetrics Control Devices
ARCHIVED

20419 80th Ave. So., Kent, WA 98032 USA
Phone: [phone] Fax: [phone]
www.seametrics.com 1-800-975-8153
4 of 4
SPX, SPT Parts Listing
1 Bearing Assembly 16772 (2 each)
2* Rotor with Shaft 11127 (Kynar/ceramic/2 magnet)
11129 (Kynar/carbide/2 magnet)
11133 (Kynar/silicon/2 magnet)
11132 (Kynar/ceramic/6 magnet)
11130 (Kynar/carbide/6 magnet)
26456 (Kynar/silicon/6 magnet)
3 Body
4 SPX Lens 16018 (Polypro)
16022 (acrylic)
SPT Lens 26174 (TFE)
5* O-Ring: EPDM 25081
VITON 16455
6 SPX Screw 07687 (4 each)
SPT Screw 07685 (4 each)
SPT Hexnuts 07705 (4 each)
7 Flow Direction Tag 19036
8* Sensor 26310
*recommended spare parts
ARCHIVED