Seametrics SP Series Turbine Flow Meter Manual

Seametrics SP Series Turbine Flow Meter Manual
S-SERIES
SPX
SPT
S - S E R I E S L O W F L O W M E T E R i n str u c tio n s
LOW FLOW METER
instructions
GENERAL INFORMATION, FEATURES, SPECIFICATIONS
These versatile impeller flowmeters are available in 3/8",
1/2”, 3/4”, and 1" nominal pipe sizes with female NPT
threads (SAE optional). They employ jewel bearings to allow
for very low minimum flow rates and superior life.
With a body material of polypropylene, the SPX is an economical choice for metering water or low corrosion fluids. The lens
cover is available in a choice of materials: acrylic for visual
flow indication of low-corrosive fluids; polypropylene when
more corrosion resistance is needed. The standard rotor assembly is Kynar with tungsten carbide shaft (ceramic shaft
optional). The O-ring is EPDM.
The SPT offers greater chemical resistance with a Teflon body
and cover, Teflon-coated Viton O-ring, and standard Kynar/ceramic rotor assembly (carbide shaft optional).
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 FT420 provides
flow rate and total flow indication, with 4-20 mA ouput capability. The FT415 is a battery-operated rate & total display. For
metering pump pacing or interfacing with lowspeed counters,
the PD10 pulse divider is recommended. The AO55 may be
used for blind 4-20mA transmission.
FEATURES
Thread-in Sensor, Field Replaceable,
6-24 Vdc pulse
18’ Sensor Cable
Removable Lens Assembly
Standard Acrylic Top (SPX)
Hex Screws
Female NPT Ports (SAE optional)
(Internal)
Jewel bearings
Kynar/Carbide or Kynar/Ceramic Rotor Assembly
EPDM (SPX) or Teflon-coated Viton (SPT) O-ring
SPECIFICATIONS*
SPX
SPX
shown
SPT
Connection Ports
3/8”, 1/2”, 3/4”, 1”, Female NPT thread
(SAE optional)
3/8”, 1/2”, 3/4”, 1”, Female NPT thread
(SAE optional)
Sensor Cable
18 feet standard (Maximum cable run 2000 ft.)
18 feet standard (Maximum cable run 2000 ft.)
Materials Body
Polypropylene
TFE Teflon
Rotor
PVDF (Kynar)
PVDF (Kynar)
Shaft
Nickel tungsten carbide (zirconia ceramic optional)
Zirconia ceramic (silicon carbide optional)
O-Ring
EPDM (Kalrez or Teflon-coated Viton optional)
Teflon-coated Viton (EPDM or Kalrez optional)
Bearings
Ruby ring and ball
Ruby ring and ball
Cover
Acrylic (Polypro optional)
TFE Teflon
Maximum Temperature
160˚ F (70˚ C)
160˚ F (70˚ C)
Maximum Pressure
150 PSI (10 bar)
150 PSI (10 bar)
Accuracy
+1% of full scale
+1% of full scale
Power
5-24 Vdc, 2 mA min
5-24 Vdc, 2 mA min
Outputs
Current sinking pulse, 6-24 Vdc
Current sinking pulse, 6-24 Vdc
Regulatory
Mark (Standard Power Only)
*Specifications subject to change • Please consult our website for current data (www.seametrics.com).
Page 2
Mark (Standard Power Only)
INSTALLATION, CONNECTIONS
Installation
Piping Requirements. Standard fittings are female NPT. 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 recommended. Vertical, horizontal, or inverted (lens down) installations are all
acceptable.
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.
K-factor on label
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.
CONNECTIONS
Connecting to Non-Seametrics Control Devices. It is
often desirable to connect an SPX/SPT flow 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
Input Designed
for devices
Current that require 5-24 Volts
current sinking
(NPN) GMR
Sinking
(NPN)
Devices
DC and 2 mA current. They can connect directly to a PLC
or computer board (See Fig. 1) if:
Red
1. The sensor power supply on the PLC is 5+DC
- 24
Vdc
Voltage
(24 Vdc is typical).
2. The sensor power supplyWhite
can provide at Signal
least 2 mA
(100 mA is typical).
Black can accept a current
3. The sensor input on the PLC
Ground
sinking device.
4. The PLC frequency response > flow meter output
frequency.
NPN
Device for Current
Input Designed
Figure
1 (NPN) Devices
Sinking
Figure 1
Input Designed for Current
Sinking (NPN) Devices
Red
White
Black
NPN
Device
NPN
Device
If the PLC input only accepts current sourcing devices, a
pull-up resistor must be added (See Fig. 2). Typically, on a
24 Vdc input a 2.2 K Ohm resistor will be effective.
Input
Figure
2 Designed for Current
Sourcing
Devices
Input
Designed(PNP)
for Current
Sourcing (PNP) Devices
2.2K Ohm Pull-up
Resistor
Red
+DC Voltage
White
Signal
Black
NPN Device
NPN
Input Designed
Device for Current
Sourcing (PNP) Devices
Ground
PNP Device
Figure 2
Since the three-wire pickup sensors are solid state, they
bounce and can be used at relatively
+DC Voltage
Signal
Ground
NPN Device
Figure 1
2.2Kdo
Ohm
notPull-up
exhibit switch
Red
Resistor
high frequencies.
+DC Voltage
White
If the PLC is equipped with a 4-20
mA analog input module,
Signal
it is necessary to order the S- Series flow sensor with some
Black
form of 4-20 mA transmitter. TwoGround
options are the AO55 blind
transmitter and the FT420 indicating transmitter. Follow
the connection diagrams for these products to connect to
the analog input.
NPN
Device
Figure 2
Page 3
REPAIR, MAINTENANCE
Repair
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, unthread the sensor by hand. Thread
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
SPX/SPT Parts Listing
SPX
SES SENSOR CONNECTION
SPT
1 Body
-038
16471
25104
-050
16472
25103
-075
16473
25102
-100
16474
25101
2 Flow Direction Label
19036
19036
3 Bearing Assembly (2 required)
16772
16772
Bearing Removal Tool (not shown)
26108
26108
4 Rotor with Shaft
Kynar/ceramic (2 magnet)
11127
11127
Kynar/carbide (2 magnet)
11129
11129
Kynar/ceramic (6 magnet, high res)
11132
11132
Kynar/cabide (6 magnet, high res)
11130
11130
5 O-Ring
EPDM
25081
Teflon-coated Viton®
31403
6 Cover
Before 5/05 After 5/05Before 5/05 After 5/05
Polypro
16018
31007
Acrylic
16022
31006
TFE Teflon
26174
31005
7 Cover Screws (4 required)
Hexscrew
25370
Screw (use with hexnut 07705)
07685
Hexnut (use with screw 07685)
07705
8 Sensor
Standard
26310
26310
Micropower
29953
29953
2
5
4
3
3
1
6
7
8
S e a m e t r i c s I n c o r p o r a t e d • 1 9 0 26 72nd Avenue South • Kent, Washington 98032 • USA
( P ) 2 5 3 . 8 7 2 . 0 2 8 4 • ( F ) 2 5 3 .872.0285 • 1.800.975.8153 • www.seametrics.com
Page 4
LT-65200067-B
6/25/10
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