Seametrics TX81 Series User manual

TX80-Series
FLOW SENSOR
INSTRUCTIONS
•TX81
•TX82
TX80-SERIES FLOW SENSOR INSTRUCTIONS
9001:2008
CERTIFIED COMPANY
ISO

TABLE OF CONTENTS
General Information
Specifications, Features .......................................................................................................................................Page 1
Installation
Distorted Flows, Fitting Installation, Meter Installation, Positioning the Meter ................................................Page 2
Straight Pipe Recommendations ......................................................................................................................... Page 3
Full Pipe Recommendations.................................................................................................................................Page 4
Electrical Connections
FT415/FT420, Connecting to PLC's.....................................................................................................................Page 5
Operation
Modularity, Output, Fittings, Minimum Flow, Flow Range Table,
Calibration (“K-Factor”).........................................................................................................................................Page 6
Maintenance
Rotor Replacement, Signal Troubleshooting, Sensor Replacement..................................................................Page 7
Parts Explosion
Parts List................................................................................................................................................................Page 8
Troubleshooting
Problem, Probable Cause .....................................................................................................................................Page 9
TABLES AND DIAGRAMS
Specifications, Features .......................................................................................................................................Page 1
Distorted Flows, Positioning the Meter................................................................................................................Page 2
Straight Pipe Recommendations ......................................................................................................................... Page 3
Full Pipe Recommendations.................................................................................................................................Page 4
Connections Diagram ...........................................................................................................................................Page 5
Flow Range Table ..................................................................................................................................................Page 6
Rotor Replacement ...............................................................................................................................................Page 7
Parts Explosion, Parts List....................................................................................................................................Page 8
Troubleshooting.....................................................................................................................................................Page 9

Rotor
O-Ring
Cable-Seal Strain Relief
U-Clip Insertion Point
Bearing Housing
Fitting
TABLES AND DIAGRAMS
Page 1
GENERAL INFORMATION, SPECIFICATIONS, FEATURES
FEATURES
The TX80-Series are insertion turbine meters designed for use
in 1-1/2" to 8" pipe. High-quality jewel bearings and precision
shafts ensure long life and low friction. Available in 316 stain-
less steel, brass and PVC, sensor bodies are machined from
solid rod for maximum low-ow performance. The TX80-Series
use special ttings that ensure ease of installation and correct
depth setting in the pipe.
The rotation of the turbine is detected by a non-drag Hall-effect
sensor. Output is a pulse-type square wave, which can be sent
long distances (up to 2,000 feet) without a transmitter. This
signal can be connected directly to Seametrics controls and
displays, as well as PLC's, counters, and computer cards.
Seametrics TX80 meters are ideal for chemical proportioning
applications. If no display is required, a simple divider such as
the PD10 provides adjustable pump pacing. For rate and total
display, as well as pump pacing, the FT420 ow indicator can
be mounted directly on the TX80-Series, or remotely on a wall
or panel. The FT415 offers a battery-operated rate/totalizer
where power is not available.
Caution: U-clip
must be installed
before use.
GENERAL INFORMATION
SPECIFICATIONS*
PVC, brass or stainless steel
PVFD rotor/carbide shaft
Ruby jewel
EPDM (Viton optional)
GMR (Giant Magnetoresistive Sensor)
Brass 316 SS PVC
200 psi (14 bar) 200 psi (14 bar) 175 psi (12 bar) at 75°
Not Available 400 psi (28 bar) Not Available
200° F (93° C) 130° F (55° C) at 0 psi
0.5 to 30 ft./sec.
+/- 2.5% of full scale
Current sinking pulse, 20 mA max, 30 Vdc max (Micropower option: Pulse output swings between supply voltage and 0 Vdc)
6-30 Vdc @ 8 mA (Micropower option: 3.5-16 Vdc @ 0.3 mA max)
22 AWG, 3 Con, 18’; 2000’ max run
Materials Body
Rotor Assembly
Bearings
O-Ring
Rotor Pickup
Maximum
Pressure
High Pressure**
Temperature
Flow Range
Calibrated Accuracy
Signal
Power
Cable
*Specications subject to change. Please consult our website for the most current data (www.seametrics.com).
**High pressure option requires an appropriate tting.

INSTALLATION
Page 2
Faster flow causes
meter to read high
FLOW
Distorted flow
profile
BEST
Okay, if no air in pipe
Okay, if no sediment in pipe.
Fitting Installation. TX80-Series meters require special t-
tings. The meter tting must rst be installed in the pipeline.
Straight pipe of at least ten times the diameter upstream of
the meter and ve diameters downstream is strongly recom-
mended in order to achieve proper accuracy. These are
minimum values. As the diagrams on the the next page will
show, you may need more straight run under specic adverse
circumstances.
If you can’t provide enough run to smooth out the turbulence
caused by valves, ttings, and changes in direction, some
decrease in accuracy may result. This does not mean that
the ow meter’s reading is meaningless, however. In some
applications (for instance, where the ow meter is part of a
control system, operating a valve or controlling chemical ad-
dition), a repeatable reading may be more important than a
highly accurate one.
TX80-Series PVC meter tees are supplied with some up-
stream straight pipe. The length provided may be less
than ten diameters upstream and five downstream. It
is not advisable to connect directly to the end of these
fittings with a flow-disturbing device such as a valve or
elbow. If possible, straight pipe should be added to the up-
stream end of these ttings.
A PVC tting is usually installed by solvent welding. The stain-
less steel and brass meter ttings have female pipe threads,
requiring the appropriate male threaded ttings. Saddle t-
Caution: Never remove the u-clip retainer
when the pipe is under pressure. Always
remove pressure from the pipe before you
attempt to remove the meter. Removal un-
der pressure may result in damage or serious injury.
tings (size 3” and above) require a hole to be cut in the pipe.
The recommended hole size is 1-3/4”.
Meter Installation. After the meter tting is installed in the
pipeline, the meter can be installed in the tting. Press the
meter into the tting as far as it will go. Retain the meter in
place by inserting the u-pin. The pin can be installed from
either side. It may be necessary to rotate the probe back and
forth slightly to start the pin into the slots on the probe. Slide
the pin in as far as it will go.
DISTORTED FLOWS
POSITIONING THE METER
10X
Diameter Minimum
(See Below)

Page 3
INSTALLATION
STRAIGHT PIPE RECOMMENDATIONS
(X = diameter) 5X
10X
5X10X
5X
20X
5X
20X
30X
50X
Reduced Pipe
Two Elbows In Plane
Two Elbows, Out Of Plane
Expanded Pipe
Swirling Flow
Propeller Meter
Partially Open
Buttery Valve
Spiral Flow

Page 4
INSTALLATION
Caution: These ow sensors are not recommended for installation down-
stream of the boiler feedwater pump where installation fault may expose the
ow sensor to boiler pressure and temperature. Maximum recommended
temperature is 130°F (Plastic), 200°F (Metal).
FULL PIPE RECOMMENDATIONS
Possible Problem:
Allows air pockets to form at sensor
Better Installation:
Ensures full pipe
Possible Problem:
Post-valve cavitation can create air pocket
Better Installation:
Keeps pipe full at sensor
Possible Problem:
Air can be trapped
Better Installation:
Allows air to bleed off

Micropower Sensor Only
Battery Type:
Lithium "C, 3V, replaceable
Red
White
Black
Sensor
Input
+-
s
(Passes flow sensor
pulse on to another
control without
scaling)
Pulse Responsive
Metering Pump
PULSE PASSTHRU PULSE
SCALED
+
-
+
-
Electronic
Metering Pump
Current sinking
polarity-sensitive
Page 5
CONNECTIONS DIAGRAMS
Connecting to PLC's and other non SeaMetric Controls
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
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
(Passes flow sensor
pulse on to another
control without
scaling)
Pulse Responsive
Metering Pump
PULSE PA SSTHRU PULSE
SCALED
SENSOR INPUT
POWER 4-20 mA
Flow Sensor
Red
White
Black
S
12-32 VDC
Loop Power Supply*
4-20 mA Device
-
++-
+
-
+
-
+
-
+
-
BASIC CONNECTIONS
*FT420 ONLY
Current sinking
polarity-sensitive
Connections for FT420/3-Wire Mechanical Meter
FT415 Standard Connections
Caution: Do not apply
external power to the FT415.
3-Wire
Mechanical
Meter

OPERATION
Page 6
Flow Range (GPM)
1-1/2" 2" 3" 4" 6" 8"
Min 1.1 2.1 4.6 7.9 18 31
Max 190 314 691 1190 2700 4680
Minimum Flow. As with any other ow sensor, there is a rate
below which the TX80-Series sensor cannot read. Check the
ow rate table below for the minimum ow rate detectable by
the sensor for a given pipe size.
Calibration (“K-factor”). The K-factor represents the actual
number of pulses per gallon the meter produces during a ow
test. This number can be entered into your electronic control to
make it read properly. If the TX80-Series meter is ordered with
a tee tting, it is factory-calibrated in the tting and the K-factor
is indicated on the side of the tting. For saddle and weldolet
K-factors, see the K-factor calculator located at the bottom of
the www.seametrics.com home page.
10031295
MF81T-P200
K: 53.6
Find Your K-Factor Here
Modularity. Any of the TX80-Series ow sensors can have elec-
tronic modules mounted directly to them, either at the time
of order or by adding an adaptor kit in the eld (part number
MK10). Alternatively, the ow sensor and indicator or transmit-
ter can be installed remote from each other. The FT420 is an
indicating transmitter (rate, total, 4-20 mA output), and the
AO55 is a blind 4-20 mA transmitter. For data logging, add
the DL76. The FT520, which provides batching and other func-
tions, is suitable for remote installation.
Output. The output is a current-sinking pulse (square wave)
compatible with many controls in addition to the Seametrics
indicators and transmitters. The most common of these are
water treatment controllers and programmable logic control-
lers (PLC’s). For these units, it is sometimes necessary to
provide a pull-up resistor if the controller does not provide for
a current-sinking output. (See the section on “Connecting to
PLC’s and other controllers” before connecting to a non-Sea-
metrics control.)
Fittings. Since the TX80-Series sensors are not adjustable,
they must be purchased with ttings appropriate to the appli-
cation. The TX81 is sized for ttings of 1 1/2” to 3”. The TX82
is for ttings of 4” and 8”. Each tting insures that the ow
sensor is installed at the correct point. Every ow sensor and
every tee tting is wet calibrated. Saddle ttings are normally
not wet calibrated, because they are eld-installed on a pipe.
In PVC however it is possible to order a saddle pre-installed on
a standard length of pipe, in which case the entire assembly is
wet-calibrated. For all other saddles, the K-factor (pulses per
gallon) is established through testing with various standard
schedules of pipe and provided with the saddle.

Sensor Replacement. It is very unusual for a sensor to re-
quire replacement in normal use. The primary cause of sensor
failure is overvoltage (inadvertent connection of line voltage,
for example) or incorrect polarity on hookup. The sensor is
replaced by removing the strain relief, then threading out
the sensor retainer plug. Remove the entire sensor capsule
by pulling on the cable. The new sensor capsule can then be
installed, orientation is not critical. Replace the retainer plug,
and then replace and tighten the strain relief.
Rotor Replacement. It is unusual for a rotor to require re-
placement due to damage sustained in normal service. More
commonly, the meter is dropped while it is out of the pipe.
Another reason for rotor replacement is shaft wear after long
service. Rotors are easily eld-replaced.
To install a rotor, follow these steps:
1. Unscrew the threaded bearing housings to expose
the shaft ends. If bearings are being replaced,
back them completely out.
2. Remove the rotor. Put the new rotor in its place.
3. Thread in one bearing housing part way, then the
other. Take care to start the end of the shaft into
the bearing hole before tightening further.
4. Screw in bearing housings until they bottom.
Note: Do not use excessive force.
5. Check for free spin. Blowing lightly on the rotor
should result in it spinning rapidly and coasting to a
smooth stop.
Caution: Never remove the u-clip retainer
when the pipe is under pressure. Always
remove pressure from the pipe before at-
tempting to remove the meter. Removal
under pressure may result in damage or
serious injury.
MAINTENANCE
Page 7
Signal Troubleshooting. The ow sensor has only one moving
part, the rotor. If this is turning properly and there is no signal,
the magnetic sensor is not operating properly. To check the
signal, apply 12 Vdc regulated* power to the red (+) and black
(-) leads. Set a multimeter to voltage reading. Put the positive
multimeter lead on the red wire and the negative lead on the
white wire. Slowly turn the rotor. Voltage reading should swing
between +12 Volts and 0 Volts as the rotor turns. If it does
not, the solid-state magnetic sensor is not working properly.
Checking for continuity is not a useful test of these sensors.
*NOTE: An unregulated power supply can exceed max voltage of
micro powered sensor (gray cable) and damage sensor.
Rotor Replacement
Shaft
Turbine Rotor
Bearing*
Housing

7
8
9
11
10
13
12
3
7
6
5
4
2
1
Page 8
PARTS EXPLOSION
TX80-SERIES PARTS LISTING
Upper Housing
Gasket
Lower Housing
Housing Screw
Plug, Steel
Plug, Plastic
Strain Relief
Sensor Retaining Screw
Pick Up, Standard Low Power
or
Pick Up, Micro Power (FT415/DL76)
O-Ring, EPDM
or
O-Ring, Viton
Rotor Repair Kit
(Polypro/Tungsten Carbide)
Rotor Assembly
(Polypro/Tungsten Carbide)
U-Clip
1
2
3
4
5
6
7
8
9
10
11/12
12
13
26181
26211
29930
26229
26073
26079
07655
25321
26310
29953
25081
16455
33087
33015
15527

Page 9
Insufcient ow
Bad connections to control
electronics
Incompatible control
Damaged or missing rotor
Failed magnetic sensor
Not enough straight pipe between
meter and severe ow disturbance
Wrong K-Factor entered
Magnetic sensor failing to pick up
each blade
TROUBLESHOOTING
Reduce pipe size if possible, use dif-
ferent type of sensor
Reconnect if necessary
Use different power supply
Add pull up resistor, (See pg. 5)
Obtain new rotor and replace
(See pg. 7)
Replace magnetic sensor
Move meter away from ow
disturbance or eld calibrate
Problem Probable Cause Try...
No signal after installation
Inaccurate metering

LT-65200048-100211
10/2/11
Seametrics Incorporated • 19026 72nd Avenue South • Kent, Washington 98032 • USA
(P) 253.872.0284 • (F) 253.872.0285 • 1.800.975.8153 • www.seametrics.com