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Signet 2507 Mini Flow Sensor
r
*3-2707.090*
3-2507.090 Rev. K 11/05 English
SAFETY INSTRUCTIONS
1. Do not remove from pressurized lines.
2. Confirm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure specifications.
4. Wear safety goggles or faceshield during installation/service.
5. Do not alter product construction.
6. Failure to follow safety instructions could result in severe personal injury.
English
1. Description
The Signet 2507 Mini Flow Sensor contains a free-running rotor
which is driven by the fl uid fl ow. Within the given measurement
range, the rotational speed of the rotor is proportional to the fl uid
fl ow rate. Permanent magnets built into the rotor actuate an
electronic switch in the top of the sensor generating a squarewave output signal proportional to fl ow rate. Both opaque and
transparent fl uids can be measured from 0.2 to 20.0 centistokes.
Wetted sensor parts are constructed of PVDF and FPM, making
the sensor suitable for use with most process fl uids, including
most acids, bases, light oils, and solvents.
WARNING!
2. Specifi cations
General
Compatibility:
Flow Sensor
2507
3-5075
Flow Range:
• -2V sensor: 400 to 2800 mL/m (0.105 to 0.740 U.S. gpm)
• -3V sensor: 700 to 4200 mL/m (0.185 to 1.123 U.S. gpm)
• -4V sensor: 1300 to 6000 mL/m (0.343 to 1.585 U.S. gpm)
• -6V sensor: 3200 to 12000 mL/m (0.845 to 3.170 U.S. gpm)
Linearity: ±0.25% of full range
Repeatability: ±0.25% of full range
Viscosity range: 0.2 to 20.0 centistokes
Pipe connections: G
1
/4 in. ports, 1/4 in. NPT (male) pipe adapters
(2 included)
Cable length: Std: 7.6m (25 ft.), max.: 300 m (1000 ft.)
Cable type: 2-conductor shielded, twisted-pair, 22 AWG
Shipping Weight: 0.4 kg (0.8 lb.)
Instrument Options
3-8150-1
3-5500
3-5090
3-5600
3-8550
3-8900
Cable plug
Upper body with
electronic switch
25 ft. cable
FLOW
1
G
/4 in.
port threads
Lower body with
built-in rotor
Pipe fitting adapte
G 1/4 x 1/4 in. NPT
(2 included)
Polar organic solvents (i.e., ketones and chlorinated
hydrocarbons) and aromatic hydrocarbons are not
compatible with this sensor.
Wetted Materials
• Housing: PVDF
• Flow insert: PTFE
• Quad ring seal: FPM
• Rotor: PVDF
• Pipe thread adapters: PVDF
• Suitable for clean fl uids only
Electrical
Power: 5 to 24 VDC @ 10 mA max.
Output type: Open-collector transistor, 10 mA max.
sink
Max. pressure/temperature:
• 5.5 bar @ -30°C (80 psi @ -22°F)
• 5.5 bar @ 24°C (80 psi @ 75°F)
• 3 bar @ 120°C (45 psi @ 248°F)
Pressure Drop:
Pressure Drop Across Sensor vs. Flow Rate
PSI
BAR
1.50
21.76
18.13
14.50
10.88
7.25
3.63
1.25
1.00
0.75
0.50
0.25
02040607080
Flow rate (%) of full scale
-2V
-3V
-4V
-6V
psi
bar
100
6.9
80
5.5
60
4.
1
40
2.8
20
1.4
0
-40 0 40 80 120 160 200 240 280
-40 -18 4 27 49 71 93 116 138
°F
°C
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Dimensions:
95 mm (3.74 in.)
FLOW
68 mm (2.7 in.)
Mounting tabs (3),
#8 or M4 self-tapping
screws required
(customer supplied)
32.5 mm (1.28 in.)
bolt circle
65 mm
(2.6 in.)
3. Installation
• The sensor may be installed in any position, although
horizontal fl ow is recommended (the sensor mounted upright).
If the sensor is not installed upright, the linearity error may be
greater in the lower part of the sensor's measurement range.
• Mounting tabs are provided using #8 or M4 self-tapping
screws (customer supplied). See Dimensions illustration for
mounting tab hole pattern specifi cations.
• Install sensor with the arrow pointing in the direction of fl ow.
• Always maximize distance between the sensor and pump
source. Never install immediately downstream of valves,
fi ttings, etc. For optimum performance, a straight fl ow run of at
least 100 to 150 mm (4 to 6 in.) should be provided before and
after the sensor.
• Two pipe fi tting adapters (included) convert the G
1
/4 in. straight
threads to 1/4 in. NPT pipe threads. Hand tighten only! Apply
1-2 turns of sealing tape to all threaded connections to prevent
leaks.
CAUTION!
Use an adjustable wrench to prevent the fi tting
adapters from overtightning while installing
mating pipe connectors. Sensor damage will
occur if the ports are overtightened.
Pipe Fitting
Adapters
(included)
FLOW
FLOW
100-150 mm (4-6 in.)
Mounting
tabs (3)
Hand
tighten
only!
Coupling
100-150 mm (4-6 in.)
Compatible pipe/tubing connections (customer supplied):
Female SxT
coupling
Female TxT
coupling
Female TxT
coupling
Female TxT
union
Installation Hints
• Avoid vibrations and shocks
• Avoid solids in the fl uid
• Install a fi lter or line strainer upstream to protect sensor
Pipe or
tubing
Hose
adapter
4. Wiring Details
4.1 Cable Extensions
The standard 25 foot sensor cable can be extended to 300 m
(1000 ft.) using 2-conductor shielded twisted-pair cable.
• Always maintain cable shield through cable splice.
• For splice-free cable replacement up to 300 m (1000 ft.), refer
to the sensor plug connection diagram (below) for connection
details.
2
Sensor Power:
5 to 24 VDC
(Black wire)
1
Sensor
ground
2
(Silver wire)
Disregard ground
symbol on connector
Sensor Signal Output
(Red wire)
Sensor
Plug (side)
Max cable length:
300 m (1000 ft.)
Signet 2507 Mini Flow Sensor
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4.2 Instrument Connections
A
2507
C
2507
FLOW
FLOW
Shield
Black
Red
Std. Sensor
Black
Red
Shield
Signet
5500/5600
Freq. IN
Freq. IN
Sen. Pwr.
Open Collector
Sensor
Signet
9010
SENSOR
BLK RED SHLD
12 13 14
Iso. Gnd
B
OPEN
COLLECTOR
SENSOR
STANDARD
SENSOR
D
Signet
8550
Frequency In
Sensor Power
Gnd
Frequency In
2507
FLOW
Red
Black
Shield
Black
Shield
Red
2507
Other Brands
External Power supply
10 kΩ
FLOW
+
-
Gnd.
Input
5 to 24
VDC
Other
instrument
• Pull-up resistor required (10 kΩ recommended). Consult your instrument manual for
• Configure instrument input card for 2507 sensor input
additional information.
5. Calibration
The K-Factors listed below represent the number of pulses the sensor will generate for each measured engineering unit. They are listed
in U.S. gallons, liters, and mL by sensor model.
Sensor
Model
Flow
Insert
Pulses per
U.S.GAL
K-FACTORS
Pulses per
LITER
Pulses per
mL
3-2507.100-2v 2mm 5685 1502 1.502
3-2507.100-3v 3mm 3308 874 0.874
3-2507.100-4v 4mm 2316 612 0.612
3-2507.100-6v NONE 1249 330 0.33
6. Replacement Parts
Upper
body
Cable plug,
#3-2507.080-5
Signet 2507 Mini Flow Sensor
Rotor,
#3-2507.080-2
Flow inserts:
2 mm: #3-2507.081-2
3 mm: #3-2507.081-3
4 mm: #3-2507.081-4
Quad ring seal,
3-2507.080-3
FLOW
Lower body,
#3-2507.080-4V
3
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7. Replacing The Flow Insert
Sensor range can be modifi ed by changing the fl ow insert. The
sensor must be removed from service and disassembled prior to
installing the new fl ow insert. See section 2 specifi cations for fl ow
range data.
Flow Insert Replacement Procedure:
1. Depressurize system and remove sensor.
2. Rotate the upper sensor body clockwise until it releases from
the lower half, then lift off.
3. Remove rotor and quad ring seal from lower body.
4. Push the fl ow insert outward using a small screwdriver.
5. Install the new fl ow insert (small diameter inward) with the
eraser end of a pencil. Apply light pressure until insert seats
against the step in the lower body. Do not force!
6. Install rotor into lower body. Spin rotor with fi nger and check
for free rotation. If rotor hits fl ow insert, remove rotor and
push insert back until free rotor rotation is established. Use a
rounded object like a pen or pencil body to adjust fl ow insert
depth.
7. Install rotor, quad ring, and upper body. Hand tighten only!
Do not overtighten upper body or the lower body assembly
tabs will break.
8. Troubleshooting
8. Reprogram instrument with new K-Factor, see calibration
section 5.
WARNING!
Do not use tools of any kind on the sensor body or port
connections. Hand tighten only! Excessive force will
damage sensor.
Upper body
Assemble
(counterclockwise)
flow
insert
Inlet port
Rotor
FLOW
Lower Body
Disassemble
(clockwise)
Quad ring seal
Assembly
Tabs (3)
Outlet port
Condition Recommendation
Erratic or missing
sensor signal
A) Verify ALL cable and instrument connections (section 4).
B) Verify proper sensor installation (section 3).
C) Remove power from instrument and disconnect sensor inputs. Power up instrument and check across
Black and Shield terminals with a digital voltage meter for 5 VDC.
If 5 VDC is not present, the problem is in the instrument or the wiring.
D) Verify the 2507 paddlewheel is spinning freely by blowing into the fl ow chamber. If the paddlewheel
Perform steps A-E
If sensor problems
persist, contact your
local Signet dealer
doesn’t spin freely, the following conditions may exist:
• The sensor may be dirty or clogged. Disassemble and clean with hot tap water and soft brush
(see section 7).
• The rotor may be hitting the fl ow insert. Disassemble and adjust fl ow insert depth (see section 7).
E) Test sensor with fl ow system active and sensor powered. Use an oscilloscope to check the sensor input
signal across the Red (Signal IN) and Shield terminals. A square wave signal should appear at these
terminals. If no signal is present replace sensor.
9. Ordering Information
Mfr. Part No. Code Description
3-2507.100-2V 198 801 732 Mini-Flow Sensor, 2mm insert
3-2507.100-3V 198 801 733 Mini-Flow Sensor, 3mm insert
3-2507.100-4V 198 801 734 Mini-Flow Sensor, 4mm insert
3-2507.100-6V 198 801 736 Mini-Flow Sensor, 6mm inlet, no insert
Accessories
Mfr. Part No. Code Description
3-2507.080-2 159 000 254 Rotor, 2507
3-2507.080-3 159 000 255 Quad Ring, 2507
3-2507.080-5 159 000 256 DIN Connector, 2507
3-2507.081-2 198 801 502 2 mm Insert
3-2507.081-3 198 801 503 3 mm Insert
3-2507.081-4 198 801 558 4 mm Insert
5523-0222 159 000 392 Cable, per foot
George Fischer Signet, Inc. 3401 Aerojet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. (626) 571-2770 • Fax (626) 573-2057
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): (800) 854-4090
3-2507.090 Rev. K 11/05 English © George Fischer Signet, Inc. 2002 Printed in U.S.A. on recycled paper
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