Georg Fischer 2537 Operating Manual

Signet 2537 Paddlewheel Flowmeter

*3-2537.090*

3-2537.090 Rev. 11 03/19

Description

The 2537 Paddlewheel Flowmeter Series off er low fl ow, low power and high resolution
with various output options such as a Volumetric Pulse, Pulse Divider, Flow Switch,
Digital (S
built-in user interface.

• The 4 to 20 mA model provides a blind current loop output.

• The Digital (S

• The Multi model uses a single relay (mechanical or solid state) and has three

A small LCD enables the 2537 to be programmed without any external equipment.
During normal operation the display is not visible.

3

L), or 4 to 20 mA. This unit can be confi gured on-site directly through the

Multi-Parameter Controller or 9900 Transmitter.

selectable operating modes:

• Divider Mode scales the paddlewheel frequency down to accommodate low
frequency input devices.

• Total Mode outputs one pulse per a set volume of fl uid.

• Flow Switch Mode uses a single relay for Hi or Lo alarm operation.

English

Operating Instructions

3

L) model provides a Digital (S3L) output for use with the Signet 8900

• English

• Deutsch

• Français

• Español

• Italiano

• 中文

For earlier versions of this sensor,
the Rev. C version of the 2537 manual
is available at www.gfsignet.com,
under Resource Center.

Select Sensors and Instrumentation,
click Archived Products, select 2537,
click Instruction Manuals.

Table of Contents

Warranty Statement .............................................................................. 2

Product Registration ............................................................................. 2

Safety Information................................................................................. 2

Chemical Compatibility ......................................................................... 2

Specifi cations........................................................................................ 3

Location of Fitting ................................................................................. 4

Sensor Mounting Position ..................................................................... 4

Pipe Fittings .......................................................................................... 4

Dimensions ........................................................................................... 5

Installation............................................................................................. 5

Wiring .................................................................................................... 5

Digital (S

4 to 20 mA Output Wiring .................................................................... 6

Flow Switch Output (On-Off ) ............................................................... 7

Pulse Output ....................................................................................... 7

Dry Contact Relay Wiring.................................................................... 7

Solid State Relay Wiring ..................................................................... 7

Operation .............................................................................................. 8

Menus ................................................................................................... 8

View Mode Function ........................................................................... 9

Menu Details ....................................................................................... 9

Set Flow Units ................................................................................... 10

Set 4 and Set 20 ............................................................................... 10

Set K-Factor ...................................................................................... 10

Set Contrast ...................................................................................... 10

Averaging and Sensistivity .................................................................11

Set Averaging ..................................................................................11

Set Sensitivity .................................................................................11

Multi Mode ........................................................................................ 12

P-Factor ............................................................................................ 12

Set Relay Operation.......................................................................... 13

K-Factor ....................................................................................... 14-15

H-Dimension ..................................................................................... 15

Maintenance and Cleaning ............................................................... 15

Rotor Replacement Procedure ......................................................... 15

Ordering Information ......................................................................... 16

3

L) Output Wiring .................................................................. 6

Chemical CompatibilityWarranty Information

Refer to your local Georg Fischer Sales offi ce for the most
current warranty statement.

All warranty and non-warranty repairs being returned must
include a fully completed Service Form and goods must be
returned to your local GF Sales offi ce or distributor.
Product returned without a Service Form may not be
warranty replaced or repaired.

Signet products with limited shelf-life (e.g. pH, ORP, chlorine
electrodes, calibration solutions; e.g. pH buff ers, turbidity
standards or other solutions) are warranted out of box but not
warranted against any damage, due to process or application
failures (e.g. high temperature,
mishandling (e.g. broken glass,

chemical poisoning, dry-out) or

damaged membrane, freezing

and/or extreme temperatures).

Product Registration

Thank you for purchasing the Signet line of Georg Fischer
measurement products.

If you would like to register your product(s), you can now
register online in one of the following ways:

• Visit our website www.gfsignet.com.
Under Service and Support click on

Product Registration Form

• If this is a pdf manual (digital copy),

click here

Georg Fischer Signet products are manufactured in a variety
of wetted materials to suit various liquids and chemicals.

All plastic materials including typical piping types (PVC, PVDF,
PP and PE) are more or less permeable to contained media,
such as water or volatile substances, including some acids.
This eff ect is not related to porosity, but purely a matter of gas
diff usion through the plastic.

If the plastic material is compatible with the medium according
to the application guidelines, the permeation will not damage
the plastic itself. However, if the plastic encloses other
sensitive components, as is the case with GF Signet plastic
paddlewheel sensors, these may be aff ected or damaged by
the media diff using through the plastic body and rotor.

Failures of PVDF paddlewheel sensors when used in hot nitric
acid applications have been reported. PVDF is known to allow
for substantial permeation of nitric acid constituents without
being damaged itself. No clear guideline can be given here,
since the damaging eff ect to the sensor is highly dependent
on temperature, pressure and concentration.

Utilizing sensors in applications with aggressive substances is
possible. On special request GF Signet can provide sensors
with a diff erent internal resin encapsulation (potting) that will
delay the damaging eff ect of acids to the sensors.

For all Special Product inquiries or to place an order, please
email signet-specialproduct@georgfi scher.com.

Safety Information

1. Depressurize and vent system prior to installation or removal.

2. Confi rm chemical compatibility before use.

3. DO NOT exceed maximum temperature or pressure specs.

4. ALWAYS wear safety goggles or faceshield during

installation and/or service.

5. DO NOT alter product construction.

6. If this equipment is used in a manner not specifi ed by the

manufacturer, the protection provided by the equipment
may be impaired

7. This device is not approved for use or installation in

hazardous locations.

Caution / Warning / Danger

Indicates a potential hazard. Failure to follow all warnings
may lead to equipment damage, injury, or death

Personal Protective Equipment (PPE)

Always utilize the most appropriate PPE during
installation and service of Signet products.

Pressurized System Warning

Sensor may be under pressure, take caution to vent
system prior to installation or removal. Failure to do so
may result in equipment damage and/or serious injury.

Hand Tighten Only

Overtightening may permanently damage product threads
and lead to failure of the retaining nut.

Do Not Use Tools

Use of tool(s) may damage product beyond repair and
potentially void product warranty.

Note / Technical Notes

Highlights additional information or detailed procedure.

WARNING!

Paddlewheel Retaining Nuts:

The retaining nuts of paddlewheel sensors are not designed
for prolonged contact with aggressive substances. Strong
acids, caustic substances and solvents or their vapor may
lead to failure of the retaining nut, ejection of the sensor and
loss of the process fl uid with possibly serious consequences,
such as damage to equipment and serious personal injury.
Retaining nuts that may have been in contact with such
substances, e.g. due to leakage or spilling, must be replaced.

Paddlewheel Maintenance:

Paddlewheel fl ow sensors are subject to wear and may
require maintenance and replacement of mechanical parts
(rotors, pin, O-rings, bearings, retainers, etc.). The frequency
of recommended maintenance will vary based upon
application specifi cations, characteristics of the measured
fl uid, and installation details. These can include, but are not
limited to: process fl owrate, occurrence of water hammer, fl uid
corrosiveness and abrasiveness, sensor installation relevant
to other equipment.

GF Signet off ers individual replacement parts and rotor
replacement kits, which include replacement instructions,
allowing customers to perform fi eld maintenance and reduce
application down-time. Please refer to the Paddlewheel
Replacement section (page 15) or contact your local GF Sales
Representative with any questions.

515, 2536, 8510, 8512, 2537 Only:

To support our customers, the GF Signet Repair Department
off ers services to recertify the plastic paddlewheel products to
factory specifi cation. Contact your distributor or visit
www.gfsignet.com for more information.

2

Signet 2537 Flowmeter

Specifi cations

General

Flow Rate Range .................... 0.1 m/s to 6 m/s (0.3 ft/s to 20 ft/s)

Pipe Size Range .....................DN15 to DN200 (½ in. to 8 in.)

Min. Reynolds Number ...........4500

Wiring Ports .......................... ½ in. NPT threads; liquid-tight

connector accepts cables 7 mm
to 10 mm OD (0.275 in. to

0.394 in.)

Materials

Case ........................................ PBT, Yellow

Inside Cover ............................ Valox, Black

Wetted Materials

-P0, -P1

Sensor Body ........................ Glass Filled Polypropylene

O-Rings ...............................FKM

Pin .......................................Titanium

Rotor .................................... PVDF, Black; optional ETFE with

or without carbon fi ber reinforced
PTFE sleeve for rotor pin

-T0

Sensor Body ........................ PVDF, Natural

O-Rings ...............................FKM

Pin .......................................PVDF, Natural

Rotor .................................... PVDF, Natural; optional ETFE with

or without carbon fi ber reinforced
PTFE sleeve for rotor pin

Performance

Input Frequency Range ..........1 to 1000 Hz

System Response ................... 100 ms update rate nominal

Paddlewheel Frequency ......... 49 Hz per m/s nominal

(15 Hz per ft/s nominal)

Linearity ................................... ±1% of maximum range

@ 25 °C (77 °F)

Repeatability ........................... ±0.5% maximum range

@ 25 °C (77 °F)

Electrical

Relay Specifi cations

Dry Contact SPDT................... 5 A @ 30 VDC, 5 A @ 250 VAC

Solid-State Relay .................... 100 mA @ 40 VDC,

70 mA @ 33 VAC

Power Requirements

Multi:

with Dry-Contact Relay ....... 24 VDC nominal ±10%, regulated,

30 mA max. current

with Solid-State Relay ......... 5 to 24 VDC nominal ±10%,

3

Digital (S

L) ............................. 5.0 VDC min. to 6.5 VDC max., 30

4 to 20 mA ............................... 400 mV max. ripple voltage,

Reverse Polarity and

Short Circuit Protected ........ Up to 40 V, 1 hour

Over-Voltage Protection .......... > 40 VDC over 1 hour

Output

Signal Averaging ..................... Programmable 0 to 100 seconds

Sensitivity Response ............... Programmable 0 to 9 scale

Pulse Divider/Total Pulse Output

Pulse Divider Setting ............ 1.0000 to 99999

Maximum pulse rate.......... 300 Hz

Maximum pulse width ....... 50 ms

Flow Switch Output

Relay Modes......................... Low, High

Time Delay ........................... 0.0 to 6400.0 seconds

Hysteresis ............................. Adjustable in Engineering Units

regulated, 30 mA max. current

mA max. current (1.5 mA nominal)

30 mA max. current

3

Digital (S

L) output

Type ...................................... Serial ASCII, TTL level 9600 bps

Maximum Cable Length........ Application dependent

(See 8900 manual)

Current output (Passive 4 to 20 mA)

Loop Accuracy ...................... ±32 μA (@ 25 °C @ 24 VDC)

Loop Resolution.................... 5 μA

Temp. Drift ............................ ±1 μA per °C max.

Power Supply Rejection ....... ±1 uA per V

Maximum Cable Length........ 305 m (1,000 ft)

Max. Loop Resistance .......... 600 Ω @ 24 VDC, 1 KΩ @ 32 VDC

Environmental Requirements

Enclosure Rating ..................... NEMA 4X/IP65

Storage Temperature ..............-10 °C to 75 °C (14 °F to 167 °F)

Ambient Temperature .............. 0 °C to 65 °C (32 °F to 150 °F)

Relative Humidity .................... 0 to 90% RH, non-condensing

Altitude ....................................2000 m (6,562 ft)

Pollution Degree...................... 2

Pressure/Temperature Ratings

Polypropylene Body

•

12.5 bar (180 psi) max. @ 20 °C (68 °F)

•

1.7 bar (25 psi) max. @ 85 °C (185 °F)

PVDF Body

•

14 bar (200 psi) max. @ 20 °C (68 °F)

•

1.7 bar (25 psi) max. @ 85 °C (185 °F)

psi

bar

200

14

160

11

120

8

80

6

40

3

°F

0 40 80 120 160 200

-18 4

°C

PVDF

Polypropylene

27

49

71 93

240

115

Intended Use

This product is intended for use in industrial water
treatment and wastewater treatment applications
where the chemical content and the fl uid temperatures
are consistent with the specifi cations listed herein.

This device is not approved for use or installation
in fl ammable liquids.

Standards and Approvals

• CE, UL

• NSF (3-2537-xC-Px versions only)
China RoHS (Go to www.gfsignet.com for details)

• Manufactured under ISO 9001 for Quality,

ISO 14001 for Environmental Management and
OHSAS 18001 for Occupational Health and Safety.

Declaration of Conformity according to FCC Part 15

This device complies with Part 15 of the FCC rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received,
including interference that may cause undesired operation.

Signet 2537 Flowmeter

3

Reducer

15 x I.D. 5 x I.D.

20 x I.D. 5 x I.D.

90° Elbow

40 x I.D. 5 x I.D.

2 x 90° Elbow
3 dimensions

25 x I.D. 5 x I.D.

2 x 90° Elbow

50 x I.D. 5 x I.D.

Pump/Valve

Type Description

2 to 4 inch, cut 1-7/16 inch hole in pipe
Over 4 inch, cut 2-1/8 inch hole in pipe
Special order 14 in. to 36 in.

0.5 to 2 inch versions (MPVC or CPVC)

2.5 to 4 inch versions (PVC)

2 to 4 inch, cut 1-7/16 inch hole in pipe
6 to 8 inch, cut 2-1/8 inch hole in pipe

Available in 10 and 12 inch sizes only
Cut 2-1/2 inch hole in pipe
Weld in place using solvent cement

Iron, Carbon Steel,
316 SS Threaded
tees

Carbon steel &
stainless steel
Weld-on
Weldolets

2 to 4 inch, cut 1-7/16 inch hole in pipe
Over 4 inch, cut 2-1/8 inch hole in pipe

For pipes from DN 15 to 50 mm
PP or PVDF

Type Description

Plastic
tees

Metric
Union
Fitting

PVC
Saddles

Iron
Strap-on
saddles

PVC
Glue-on
Saddles

1.5 in. to 2 in. PVDF insert

Fiberglass
tees

FPT

0.5 to 2 in. versions
Mounts on threaded pipe ends

Metric
Wafer Fitting

For pipes DN65 to 200 mm
PP or PVDF

d

Location of Fitting

+

GF

+

+

GF

+

+GF+

OKOK OK

Vertical flow is OK if the pipe remains full at all times.

+
GF

+

+GF+

Recommended sensor upstream/downstream mounting requirements:

Select a location with suffi cient length of straight
pipe immediately upstream of the sensor.

Locating the sensor in a trap or where the fl ow is
upward helps to protect the sensor from exposure
to air bubbles when the system is in operation.

These confi gurations are not recommended
because it is diffi cult to keep the pipe full.

Sensor Mounting Position

Horizontal pipe runs:

Mount sensor in the upright (0°) position for best performance. Mount at a
maximum of 45° when air bubbles are present (pipe must be full).

Do not mount on the bottom of the pipe when sediments are present.

Vertical pipe runs:

Mount sensor in any orientation; however, downward fl ow is not recommended.
Upward fl ow is preferred to ensure full pipe.

Pipe Fittings

Georg Fischer Signet off ers a wide selection of installation fi ttings that control the position of the paddlewheel in relation to the
dimensions of the pipe.

4

Signet 2537 Flowmeter

-45°

0°

+45°

Process

Process
Pipe

Pipe

Dimensions

Sensor

Cap

Ta b

Notch

Flow

Lubricate
O-rings

97 mm

(3.82 in.)

3-2537-xC-P1
5 in. to 8 in. pipe

130 mm

(5.12 in.)

97 mm

(3.82 in.)

171 mm

(6.73 in.)

3-2537-xC-P0
½ in. to 4 in. pipe

Installation

Plastic sensor installation tips

• Inspect the sensor O-rings for nicks and other damage that may compromise the seal.

• Lubricate O-rings with a non-petroleum based, viscous lubricant (grease) compatible with the system.

• Using an alternating/twisting motion, lower the sensor into the fi tting, making sure the
conduit ports on the yellow housing are pointing in the direction of fl ow.

• Engage one thread of the sensor cap then turn the sensor until the alignment tab is
seated in the fi tting notch.

HAND-TIGHTEN THE THREADED NUT ONTO THE INSTALLATION FITTING.
DO NOT USE TOOLS!

DO NOT USE THREAD SEALANT OR LUBRICANTS ON THE FITTING
THREADS OR THE SENSOR CAP.

Wiring

Electrical connections to this product should be made only by qualifi ed personnel.

To access the wiring terminals:

1. Turn yellow cap ¼ turn counterclockwise to remove.

2. Remove the two retaining screws and remove the black cover.

• Route all cables through the conduit ports before connecting them to the terminals.

• Wiring terminals are rated for 16 to 22 AWG conductors.

• The cable must be 7 mm to 10 mm in diameter (0.275 in. to 0.394 in.) to seal properly in the liquid tight connector.

3. The conduit ports have ½ inch NPT threads. After routing the cables, seal the port with a liquid tight conduit connector

(3-9000.392-1) or with conduit.

• For conduit installations:

• Thread conduit with ½ in. NPT threads directly into the conduit port.

• For conduit with ISO threads, use the black thread adapter included with the connector kit.

• To comply with NEC requirements, do not use any metal conduit in the installation.

1

2

3

Dry-Contact

N/O

Relay Rating:

Relay

COM

N/C

Power Rating:

24VDC 0.03 AMP

WIRING DIAGRAM

Sensor

PW/OUT

BLK

RED

SHLD

5A @ 250VAC

5A @ 30VDC

Blk Red Shld

-

+

+

3-2505.611A

S1

S2

Using conduitUsing the liquid-tight

connector

Signet 2537 Flowmeter

5

Digital (S3L) Output Wiring 4 to 20 mA Output Wiring

The Digital (S3L) output is compatible with the
3-8900 Multi-Parameter Controller and the 3-9900 Transmitter.

T

P

Power Rating:

5 - 6.5VDC 0.03 AMP

WIRING DIAGRAM

Sensor

Blk Red Shld

BLK

RED

S1

SHLD

PW/OUT

-

t

+

+

3-2505.613A

S2

• The 4 to 20 mA output can be connected to Chart Recorders,
PLCs or any device that requires a 4 to 20 mA signal.

• The 4 to 20 mA model requires an external power source of
12 to 32 VDC.

T

P

Power Rating:

12 - 32VDC 0.03 AMP

WIRING DIAGRAM

Sensor

Blk Red Shld

BLK

RED

S1

SHLD

PW/OUT

-

t

+

3-2505.614A

+

S2

S1

Internal sensor
connections

SHLD

GND

DATA

V+

S1

Internal sensor
connections

I/O Module 3-8900.401-X

Frequency

Frequency

Input 2

Input

S3L

Input

+5VDC (Black)

Input

Freq. Input (Red)

1

+5VDC (Black)

Freq. Input 2 (Red)

OR

S3L

2

GND (White/Shield)

+5VDC (Black)

1

GND (White/Shield)

Analog Output 1

GND (Shield)

3

S L (Red)

3

S L (Red)

Blk Red Shld

Blk Red Shld

1

2

3

4

5

6

7

8

9

10

11

+

-

3-8900.621C

-

+

S2

S1

Programmable Logic Controller
Datalogger
Chart Recorder
4 to 20 mA Loop monitor

Blk Red Shld

Internal sensor
connections

-

+

S2

+

+

-

Power Supply

12 to 32 VDC, 0.03 A

-

Connection to
9900 Transmitter

-

+

S2

Connection to
8900 Controller

6

Signet 2537 Flowmeter

Flow Switch Output (On-Off ) Dry Contact Relay Wiring

• The Flow Switch mode allows a single relay that is

• The wiring is identical for On-OFF and Pulse modes.

programmable as a HIGH setpoint or LOW setpoint.

• The relay may be a dry-contact type or a solid state type:

T

P

Power Rating:

24VDC 0.03 AMP

WIRING DIAGRAM

Sensor

BLK

Blk Red Shld

Dry-Contact

N/O

Relay

Relay Rating:

5A @ 30VDC

N/C

COM

RED

5A @ 250VAC

S1

SHLD

t

PW/OUT

+

3-2505.611A

-

+

• The Dry Contact Relay
requires an external power
source of 24 VDC ± 10%.

S2

S1

• The Solid State Relay

T

P

Power Rating:

5 - 24VDC 0.03 AMP

WIRING DIAGRAM

Sensor

Blk Red Shld

BLK

RED

Solid-State

Relay

Relay Rating:

1 2

100mA @ 40VDC

Load

70mA @ 33VAC

SHLD

3-2505.616A

PW/OUT

-

t

+

3-2505.612A

+

S2

requires an external power
source of 5 to 24 VDC.

S1

Internal sensor
connections

Normally Open

Common

Normally Closed

Blk Red Shld

Pulse Output Solid State Relay Wiring

• The wiring is identical for On-OFF and Pulse modes.• The "Multi" mode allows a single relay that is programmable
as a Flow Switch, Volumetric pulse output or as a simple
pulse divider output.

• The relay may be a dry-contact type or a solid state type.

-

+

S2

+

Power Supply

24 VDC, 0.03 A

-

Power Rating:

24VDC 0.03 AMP

WIRING DIAGRAM

Sensor

PW/OUT

+

Blk Red Shld

BLK

RED

Dry-Contact

N/O

Relay

Relay Rating:

5A @ 250VAC

5A @ 30VDC

N/C

COM

SHLD

S1

3-2505.611A

-

+

• The Dry Contact Relay
requires an external power
source of 24 VDC ± 10%.

5 - 24VDC 0.03 AMP

Sensor

BLK

S2

Blk Red Shld

S1

Solid-State

Relay

1 2

100mA @ 40VDC

Load

70mA @ 33VAC

• The Solid State Relay
requires an external power
source of 5 to 24 VDC.

• Solid State Relay
requires a pull-up resistor
(10K ohm recommended).
Consult your instrument/
PLC manual for wiring
information.

Power Rating:

WIRING DIAGRAM

RED

SHLD

3-2505.616A

Relay Rating:

PW/OUT

-

+

3-2505.612A

+

S2

S1

Internal sensor
connections

Blk Red Shld

Load

-

+

S2

1

2

10K

I/O

+–

Power Supply

5 to 24 VDC,

0.03 A

Signet 2537 Flowmeter

7

Operation

The 2537 Flowmeter is available in three diff erent models. The programming menus vary signifi cantly from one model to another.

This chart is provided inside the yellow cover to assist in navigating the menus in the 2537.

Mode Action

View → Display Flow Rate → Go to MENU Go to VIEW

Menu 1X → Next Menu

1X → Display Current Value Previous Mode

→ Go to Edit Previous Mode

1X → Shift digit to right Previous Mode

Edit 1X → Increment Value → Go to SAVE Previous Mode

SAVE 1X → Toggle 1X → Store Change N/A

Menus

3-2537-1C-XX, 3-2537-2C-XX 3-2537-5C-XX 3-2537-6C-XX

T

P

T

P

T

P

t

t

t

T

P

T

t

P

t

8

Signet 2537 Flowmeter

VIEW Mode Function

• All models display the model name: Multi, Digital or 4-20.

• If the white key (S1) is held down for three seconds, the fl ow rate is displayed for 10 minutes before reverting back to the
model name.

• In the Multi Model, if the “Multi” menu item is set to “divider”, then the divided pulse output will be displayed in

pulses / seconds (p/s).

Menu Details

This table shows the defi nition of each menu function, the setting parameters and the page where detailed instructions can be located.

Menu Function Defi nition Setting Parameters

Flow Unit Liters or Gallons per sec., min., hour or day See list on page 10 page 10

K-Factor Set PULSES per VOLUME UNIT 0.0001 to 999999 page 10

Average Smooths out erratic fl ow conditions 0 to 100 seconds page 11

Sensitivity Overrides Average for large rate changes 0 to 9 page 11

Mode Select the output mode Total or Divider or On-OFF page 12

P-Factor As PULSE DIVIDER, divides input freq. 1.0000 to 99999 page 12

P-Factor As PULSE TOTAL, multiplies K-Factor 1.0000 to 99999 page 12

Relay Logic Select Hi alarm or Lo alarm mode Hi or Lo page 13

Relay Set Set Relay Setpoint 0.0000 to 99999 page 13

Relay Hysteresis Rate inside Setpoint to DEENERGIZE relay 0.0000 to 99999 page 13

Relay Delay Time delay before relay is ENERGIZED 0000.0 to 6400.0 page 13

4 Set Set fl ow RATE to be represented by 4 mA 0.0000 to 99999 page 10

20 Set Set fl ow RATE to be represented by 20 mA 0.0000 to 99999 page 10

Contrast Adjust visibility of liquid crystal display 1 to 3 page 10

More

Information

Signet 2537 Flowmeter

9

R

Set Flow Units

This function is available on
these versions of the 2537:

Select the volumetric units
for the fl ow measurement:

Liters/second

Liters/minute
(Factory setting)

Liters/hour

T

P

T

P

Gallons/second

Gallons/minute

Gallons/hour

Set K-Factor

t

A K-Factor is the number of
pulses a sensor will generate
for each engineering unit of

t

fl uid that passes the sensor.
The factory setting is 60.0000.
Locate the K-Factor in the
tables on page 14 and 15.

Example: Set the K-Factor
to 63.5 Pulses per Gallon:

1.
2s

2.

This function is available on the
above versions of the 2537:

T

P

T

P

t

t

Liters/day

Gallons/day

Example: Set the Flow Units to Gallons per minute:

1.

2.

3.

2s

2s

Save the new setting:

2s

Return to

Go to next
menu item

Normal Operation

Set 4 and Set 20

This function is available on
these versions of the 2537:

T

P

These two functions are used to span the 4 to 20 mA output
signal to the required range.

The factory setting is 4 to 20 mA = 0 to 10.000

Only the 20 mA span is illustrated here.

Example: Set 20 mA = 500 GPM.

1.

2s

t

3.

4.

5.

2s

x2

x3

Save the new setting:

2s

6.

Go to next

7.

x5

menu item

Set Contrast

This function is available on
these versions of the 2537:

All models of the 2537 have the CONTRAST adjustment.
It is always located at the end of the menu.

1.

To access the adjustment,
enter the menu and scroll until

2s

the Contrast display appears.

2.

epeat until

x1

Three levels of adjustment are
available. The factory setting of
3 is the highest contrast setting.

T

P

T

P

Return to
Normal Operation

t

t

2.

x5

Save the new setting:

Choose:

Save the new setting:

3.

4.

6.

5.

2s

x4

x2

2s

Go to next
menu item

Return to
Normal Operation

OR

OR

2s

Go to next
menu item

Return to
Normal Operation

10

Signet 2537 Flowmeter

10 s 2 s 20 s 30 s 40 s 50 s 60 s 70 s

No AVERAGING, no SENSITIVITY

AVERAGING only

AVERAGING and SENSITIVITY

Averaging and Sensitivity Settings

• Because ideal fl ow conditions are often impossible to achieve, the fl ow rate is often erratic, which causes erratic readings in
control features (e.g., relays, 4 to 20 mA loops, etc.) that are associated with the fl ow rate.

• The best solution to these problems is to correct any piping defi ciency that causes the instability. This may involve longer straight
runs upstream, reducing the pipe size to maintain a full pipe at all times, and other installation changes. In many situations,
however, these measures are simply not possible.

• The 2537 meter provides two tools that are designed to "work around" these defi ciencies. The Averaging and the Sensitivity
features should be studied before making adjustments.

Averaging Time in Seconds (Factory set: 0 seconds)

• Set the time the meter will use as the averaging period. The range is from 0 (no average applied to input) to 100 (seconds of
averaging applied to input).

Use higher averaging times to smooth the display and current output where the fl ow in the pipe is erratic.

Quick Response Sensitivity (Factory set: 0)

• Set the relative degree of change in the fl ow rate required to allow the 2537 to disable the AVERAGING and jump to a new fl ow
rate immediately. The scale is from 0 (least sensitive, averaging is never disabled.) to 9 (a very small change in fl ow rate will
disable the averaging).

With AVERAGING set to 0 (zero) and with SENSITIVITY set to zero,
the 2537 responds to every unstable shift in the fl ow. The dashed
red line represents the actual output of the fl ow sensor in unstable
fl ow conditions.

With AVERAGING set to 50 seconds and SENSITIVITY still set to
zero the fl ow rate is stabilized, but a sharp change in fl ow rate is not
represented for 50 seconds or longer (dotted green line).

With AVERAGING at 50 seconds and SENSITIVITY set to 4 OR 5,
the fl ow rate is stabilized, while the sudden shift in fl ow is refl ected
very quickly (solid blue line).

NOTE: The SENSITIVITY function is ineff ective if the AVERAGING function is set to zero (seconds).

Set Averaging Set Sensitivity

This function is available on
these versions of the 2537:

T

P

The factory setting is 0 (zero).

Minimum value

Maximum value

Example: Set the Averaging for 50 seconds.

1.

2.

3.

4.

5.

2s

x2

2s

x5

Save the new setting:

Go to next
menu item

T

t

P

t

This function is available on
these versions of the 2537:

The factory setting is 0 (zero).

Minimum value

Maximum value

Example: Set the Sensitivity to 5.

1.

2s

2s

Return to
Normal Operation

2.

3.

4.

x3

2s

x5

T

P

t

Save the new setting:

2s

Go to next
menu item

T

P

T

P

Return to
Normal Operation

t

t

Signet 2537 Flowmeter

11

Multi Mode P-Factor

This function is available on
these versions of the 2537:

Select DIVIDER or TOTAL operation.
The factory setting is TOTAL.

PULSE DIVIDER Output = Input pulses ÷ P-Factor

DIVIDER allows you to set a scaling value (P-Factor) from

1.0000 to 99999.

Example: If the P-Factor is set for 2, then the 2537 will output
one pulse for every 2 pulses received from the sensor.
This selection enables the output frequency to be scaled down
to match associated equipment capabilities.

When using the PULSE DIVIDER output, associated
equipment must divide the K-Factors in this manual by the
P-Factor for correct calibration.

123579468

1110 12

Pulses IN

123 4

56

Pulses OUT

This function is available on the
above versions of the 2537:

T

P

t

The factory setting is 1.0000

Minimum value

Maximum value

In PULSE DIVIDER mode the P-Factor divides:

The pulse stream from the paddlewheel sensor will be divided by
the P-Factor. The resulting frequency is output through a relay.

In PULSE TOTAL mode the P-Factor multiplies:

The pulse stream from the paddlewheel sensor is divided by the
K-Factor MULTIPLIED by the P-factor. The resulting frequency is
output through a relay.

PULSE TOTAL Output = Input pulses ÷ (K-Factor × P-Factor)

TOTAL is a traditional pump pulse function. This selection will
allow the entry of a K-Factor to defi ne a volumetric unit, then set
a P-Factor to defi ne the number of volumetric units required to
generate one pulse out.

Example:
Set the Total Pulse output so there is one pulse out for each
2 gallons that passes the sensor if the K-Factor is 3.0.

1. K-Factor = 3.0 (pulses in per gallon)

2. P-Factor = 2 (gallons out per pulse)

94

4 Gal

1110

121

1 Gal

2 Gal

2235 7

3 Gal

68

Pulses IN

1

Pulses OUT

1.
2s

Save the new setting:

2s

3.

2.

4.

5.

1.

x4

x2

2s

2s

Save the new setting:

2s

Return to

Go to next
menu item

Normal Operation

12

.

.

2s

2s

T

P

t

Go to next
menu item

Return to
Normal Operation

Signet 2537 Flowmeter

Set Relay Operation

The On-OFF mode has one relay (SPDT or solid-state) that can be programmed
as a HIGH (Hi) alarm or a LOW (Lo) alarm.

T

P

T

P

t

t

1. Select HI or LO Relay Alarm logic

A HI alarm will be activated when the
fl ow rate rises ABOVE the setpoint.

A LO alarm will be activated when the
fl ow rate falls BELOW the setpoint.

The factory setting is Hi(gh).

2. Program the SETPOINT.

The SETPOINT is the fl ow rate
where the relay will be energized.
The factory setting is 5.0000.

Minimum value

Maximum value

Example: Change the Relay Logic to Low:

1.

2.

3.

4.

2s

x4

2s

Example: Change the Setpoint to 8.0000:

1.

2.

3.

4.

5.

2s

x5

2s

x3

Save the new setting:

2s

Return to

Go to next
menu item

Normal Operation

Save the new setting:

2s

Return to

Go to next
menu item

Normal Operation

3. Program the HYSTERESIS.

Hysteresis holds a relay energized until the
fl ow rate moves this amount past the setpoint.
The factory setting is 0.5000

Minimum value

Maximum value

4. Program the DELAY.

When the fl ow rate reaches the setpoint, the
2537 will wait this long (in seconds) before
triggering the alarm.
The factory setting is 0000.0 seconds.

Minimum value

Maximum value

Example: Change the Hysteresis to 5.0000:

1.

2.

3.

4.

2s

x6

2s

x5

Example: Change the Delay to 10.0:

1.

2.

3.

4.

5.

2s

x7

2s

Save the new setting:

2s

Return to

Go to next
menu item

Normal Operation

Save the new setting:

2s

Return to

Go to next
menu item

Normal Operation

Signet 2537 Flowmeter

13

K-Factor

When using the PULSE DIVIDER mode, associated equipment must divide the K-Factors by the P-Factor.

A K-Factor is the number of pulses a sensor will generate for each engineering unit of fl uid that passes the sensor.
K-Factors for water are listed below in U.S. gallons and liters.

For example, in a 1 inch SCH 80 PVC pipe, using the MPV8T010 PVC fi tting, the 2537 paddlewheel generates

335.53 pulses per gallon of water passing the rotor.

Molded Tees

PIPE
SIZE

(IN.)

SCH 80 MOLDED TEES FOR SCH 80 PVC PIPE

1/2

3/4

1

1-1/4

1-1/2

2

2-1/2 PV8T025 42.994 11.359

3 PV8T030 26.652 7.0414

4 PV8T040 15.006 3.9645

FITTING

MPV8T005F
MPV8T005
MCPV8T005F

MPV8T007F
MPV8T007
MCPV8T007F

MPV8T010F
MPV8T010
MCPV8T010F

MPV8T012F
MPV8T012
MCPV8T012F

MPV8T015F
MPV8T015
MCPV8T015F

MPV8T020F
MPV8T020
MCPV8T020F

2537 SENSOR

U.S. GAL LITERS

1027.1 271.37

583.19 154.08

335.53 88.65

178.79 47.24

121.42 32.08

71.44 18.87

Union Tees

PIPE
SIZE

POLYPROPYLENE TEES (DIN/ISO, BS, ANSI)

DN15 PPMT005 952.87 251.75

DN20 PPMT007 563.10 148.77

DN25 PPMT010 291.60 77.042

DN32 PPMT012 169.22 44.709

DN40 PPMT015 103.90 27.450

DN50 PPMT020 60.789 16.060

DN65 PPMT025 41.498 10.964

DN80 PPMT030 26.786 7.0769

DN100 PPMT040 17.415 4.6011

DN125 PPMT050 10.168 2.6864

DN150 PPMT060 7.3119 1.9318

DN200 PPMT080 3.9946 1.0554

FITTING

2537 SENSOR

U.S. GAL LITERS

PIPE
SIZE

(IN.)

SCH 80 PVC SADDLES FOR SCH 80 PVC PIPE

2 PV8S020 66.739 17.633

2-1/2 PV8S025 42.994 11.359

3 PV8S030 26.652 7.0414

4 PV8S040 15.006 3.9645

6 PV8S060 8.3246 2.1994

8 PV8S080 5.0164 1.3253

SCH 80 PVC SADDLE ON SCH 40 PVC PIPE

2 PV8S020 54.700 14.452

2-1/2 PV8S025 37.159 9.8175

3 PV8S030 23.697 6.2608

4 PV8S040 13.456 3.5552

6 PV8S060 7.4594 1.9708

8 PV8S080 4.5292 1.1966

FITTING

2537 SENSOR

U.S. GAL LITERS

Union Tees

PIPE
SIZE

PVDF FITTINGS (DIN/ISO AND BS AND ANSI)

DN15 SFMT005 827.26 218.56

DN20 SFMT007 489.87 129.42

DN25 SFMT010 283.55 74.915

DN32 SFMT012 158.59 41.899

DN40 SFMT015 86.980 22.980

DN50 SFMT020 50.385 13.312

PVC FITTINGS (DIN/ISO) - EUROPE ONLY

DN15 PVMT005 972.37 256.90

DN20 PVMT007 485.69 128.32

DN25 PVMT010 297.27 78.540

DN32 PVMT012 170.25 44.980

DN40 PVMT015 103.71 27.400

DN50 PVMT020 59.500 15.720

DN65 PVMT025 34.973 9.2400

DN80 PVMT030 24.981 6.6000

DN100 PVMT040 16.275 4.3000

DN150 PVMT060 8.1756 2.1600

DN200 PVMT080 4.0878 1.0800

FITTING

2537 SENSOR

U.S. GAL LITERS

Metal TeesSaddles

PIPE
SIZE

(IN.)

CARBON STEEL TEES ON SCH 40 PIPE

1/2 CS4T005 756.00 199.74

3/4 CS4T007 438.69 115.90

1 CS4T010 286.78 75.768

1-1/4 CS4T012 121.22 32.026

1-1/2 CS4T015 91.139 24.079

2 CS4T020 54.468 14.391

STAINLESS STEEL TEES ON SCH 40 PIPE

1/2 CR4T005 734.20 193.98

3/4 CR4T007 412.10 108.88

1 CR4T010 252.70 66.764

1-1/4 CR4T012 128.12 33.849

1-1/2 CR4T015 77.320 20.428

2 CR4T020 45.780 12.095

GALVANIZED IRON TEES ON SCH 40 PIPE

1 IR4T010 213.01 56.277

1-1/4 IR4T012 127.75 33.751

1 1/2 IR4T015 94.401 24.941

2 IR4T020 59.420 15.699

BRONZE TEES ON SCH 40 PIPE

1 BR4T010 213.01 56.277

1-1/4 BR4T012 127.75 33.751

1-1/2 BR4T015 94.401 24.941

2 BR4T020 59.420 15.699

COPPER TEE ON COPPER PIPE SCH K

1/2 CUKT005 917.84 242.50

3/4 CUKT007 428.27 113.15

1 CUKT010 256.43 67.749

1-1/4 CUKT012 176.44 46.615

1-1/2 CUKT015 115.69 30.565

2 CUKT020 63.385 16.746

COPPER TEE ON COPPER PIPE SCH L

1/2 CUKT005 858.22 226.74

3/4 CUKT007 385.74 101.91

1 CUKT010 241.64 63.841

1-1/4 CUKT012 170.90 45.152

1-1/2 CUKT015 112.03 29.598

2 CUKT020 61.74 16.310

FITTING

2537 SENSOR

U.S. GAL LITERS

14

Signet 2537 Flowmeter

K-Factor

Weldolets and Brazolets

PIPE
SIZE

(IN.)

STAINLESS STEEL WELDOLETS ON SCH 40 PIPE

2-1/2 CR4W025 37.600 9.9339

3 CR4W030 24.340 6.4306

4 CR4W040 13.920 3.6777

5 CR4W050 10.860 2.8692

6 CR4W060 7.5200 1.9868

8 CR4W080 4.3400 1.1466

CARBON STEEL WELDOLETS ON SCH 40 PIPE

2-1/2 CS4W025 37.600 9.9339

3 CS4W030 24.340 6.4306

4 CS4W040 13.920 3.6777

5 CS4W050 10.860 2.8692

6 CS4W060 7.5200 1.9868

8 CS4W080 4.3400 1.1466

COPPER/BRONZE BRAZOLETS ON SCH 40 PIPE

2-1/2 BR4B025 37.600 9.934

3 BR4B030 24.340 6.431

4 BR4B040 13.920 3.678

5 BR4B050 10.860 2.869

6 BR4B060 7.5200 1.987

8 BR4B080 4.3400 1.147

FITTING

2537 SENSOR

U.S. GAL LITERS

Wafer Fittings

PIPE
SIZE

POLYPROPYLENE WAFER FITTINGS (DIN/ISO)

DN65

DN80

DN100

DN125

DN150

DN200

PVDF WAFER FITTINGS (DIN/ISO)

DN65 SFMTF025 36.133 9.5465

DN80 SFMTF030 24.715 6.5297

DN100 SFMTF040 16.120 4.2589

DN125 SFMTF050 8.8624 2.3415

DN150 SFMTF060 6.4543 1.7052

DN200 SFMTF080 4.0720 1.0758

FITTING

PPMTE025
PPMTF025

PPMTE030
PPMTF030

PPMTE040
PPMTF040

PPMTE050
PPMTF050

PPMTE060
PPMTF060

PPMTE080
PPMTF080

2537 SENSOR

U.S. GAL LITERS

41.498 10.964

26.786 7.0769

17.415 4.6011

10.168 2.6864

7.3119 1.9318

3.9946 1.0554

Iron Saddles

PIPE

SIZE

FITTING

(IN.)

SCH 80 IRON SADDLES ON SCH 80 PIPE

2 IR8S020 64.720 17.099

2-1/2 IR8S025 42.480 11.223

3 IR8S030 26.420 6.980

4 IR8S040 14.700 3.884

5 IR8S050 12.180 3.218

6 IR8S060 8.4400 2.230

8 IR8S080 4.9000 1.295

SCH 80 IRON SADDLE ON SCH 40 PIPE

2 IR8S020 53.640 14.172

2-1/2 IR8S025 37.600 9.934

3 IR8S030 23.220 6.135

4 IR8S040 13.260 3.503

5 IR8S050 11.040 2.917

6 IR8S060 7.2400 1.913

8 IR8S080 4.4000 1.162

2537 SENSOR

U.S. GAL LITERS

H-Dimension

The plastic insert in Weldolet fi ttings MUST be removed during the welding process. When reinstalled, it is important that the insert
be threaded to the proper height ("H" dimension).

Weldolet “H” dimension

Part number inches mm

CS4W020 2.38 60.45

CS4W025 2.33 59.18

CS4W030 2.32 58.92

CS4W040 2.30 58.42

CS4W050 3.09 78.48

CS4W060 2.96 75.18

CS4W080 2.73 69.34

"H"

Weldolet “H” dimension

Part number inches mm

CR4W020 2.38 60.45

CR4W025 2.33 59.18

CR4W030 2.32 58.92

CR4W040 2.30 58.42

CR4W050 3.09 78.48

CR4W060 2.96 75.18

CR4W080 2.73 69.34

Maintenance and Cleaning

The 2537 requires very little maintenance.

• If the paddlewheel becomes fouled, it can be cleaned with mild detergents and a small brush.

• The electronics portion of the 2537 does not require maintenance or cleaning.

Rotor Replacement Procedure

1. To remove the rotor, insert a small screwdriver between the rotor and the ear of the sensor.

2. Twist the screwdriver blade to fl ex the ear outward enough to remove one end of the rotor and
pin. DO NOT fl ex the ear any more than necessary! If it breaks, the sensor cannot be repaired.

3. Install the new rotor by inserting one tip of the pin into the hole, then carefully fl ex the opposite

ear back enough to slip rotor into place.

Signet 2537 Flowmeter

15

Ordering Information

Mfr. Part No. Code Description

2537 system for 0.5 in. to 4 in. pipes:
Polypropylene body, Black PVDF rotor, Titanium pin, FPM O-rings

3-2537-1C-P0 159 001 291 Pulse/Flow Switch, DCR, -P0, Integral Mount
3-2537-2C-P0 159 001 292 Pulse/Flow Switch, SSR, -P0, Integral Mount
3-2537-5C-P0 159 001 295 Digital (S
3-2537-6C-P0 159 001 296 4 to 20 mA, Integral Mount

2537 system for 5 in. to 8 in. pipes:
Polypropylene body, Black PVDF rotor, Titanium pin, FPM O-rings

3-2537-1C-P1 159 001 303 Pulse/Flow Switch, DCR, -P1, Integral Mount
3-2537-2C-P1 159 001 304 Pulse/Flow Switch, SSR, -P1, Integral Mount
3-2537-5C-P1 159 001 307 Digital (S3L), Integral Mount
3-2537-6C-P1 159 001 308 4 to 20 mA, Integral Mount

2537 system for 0.5 in. to 4 in. pipes:
Natural PVDF body, Natural PVDF rotor and pin, FPM O-rings

3-2537-1C-T0 159 001 315 Pulse/Flow Switch, DCR, -T0, Integral Mount
3-2537-2C-T0 159 001 316 Pulse/Flow Switch, SSR, -T0, Integral Mount
3-2537-5C-T0 159 001 319 Digital (S3L), Integral Mount
3-2537-6C-T0 159 001 320 4 to 20 mA, Integral Mount

Accessories

Mfr. Part No. Code Description

3-2536.320-1 198 820 052 Rotor, PVDF Black
3-2536.320-2 159 000 272 Rotor, PVDF Natural
3-2536.320-3 159 000 273 Rotor, ETFE
3-2536.321 198 820 054 Rotor and Pin, PVDF Natural
3-2536.322-1 198 820 056 Sleeved Rotor, PVDF Black
3-2536.322-2 198 820 057 Sleeved Rotor, PVDF Natural
3-2536.322-3 198 820 058 Sleeved Rotor, ETFE
M1546-1 198 801 182 Rotor Pin, Titanium
M1546-2 198 801 183 Rotor Pin, Hastelloy-C
M1546-3 198 820 014 Rotor Pin, Tantalum
M1546-4 198 820 015 Rotor Pin, Stainless Steel
P51545 198 820 016 Rotor Pin, Ceramic
1220-0021 198 801 000 O-Ring, FKM
1224-0021 198 820 006 O-Ring, EPDM
1228-0021 198 820 007 O-Ring, FFKM
P31536 198 840 201 Sensor Plug, Polypro
3-8050.390-1 159 001 702 Retaining Nut Replacement Kit, NPT, Valox
3-8050.390-3 159 310 116 Retaining Nut Replacement Kit, NPT, PP
3-8050.390-4 159 310 117 Retaining Nut Replacement Kit, NPT, PVDF
3-9000.392-1 159 000 839 Liquid tight connector kit, NPT (1 piece)
3-9000.392-2 159 000 841 Liquid tight connector kit, PG 13.5 (1 piece)
7310-1024 159 873 004 24 VDC Power Supply, 10W, 0.42 A
7310-2024 159 873 005 24 VDC Power Supply, 24W, 1.0 A
7310-4024 159 873 006 24 VDC Power Supply, 40W, 1.7 A
7310-6024 159 873 007 24 VDC Power Supply, 60W, 2.5 A
7310-7024 159 873 008 24 VDC Power Supply, 96W, 4.0 A

3

L), Integral Mount

®

Georg Fischer Signet LLC, 3401 Aero Jet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. [phone] • Fax [phone]
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): [phone]
For the most up-to-date information, please refer to our website at www.gfsignet.com

3-2537.090 Rev. 11 03/19 English © Georg Fischer Signet LLC 2019