GF signet 2551 User manual

Signet 2551 Magmeter
SAFETY INSTRUCTIONS
1. Depressurize and vent system prior to installation or removal.
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.
*3-2551.090-1*
3-2551.090-1 Rev. G 10/08 English
1.0 Description
The 2551 Magmeter measures the flow rate in a full pipe by monitoring the voltage produced when the (conductive) fluid moves through
a magnetic field.
Output options include a traditional frequency signal, a serial data (digital) output, and a 4-20 mA output.
The 2551 Magmeter is available in three sizes that will accommodate pipes from ½ inch through 12 inch diameters.
Select from four different material combinations to match the magmeter to the application requirements.
English
1.0 Description 1
2.0 Specifications 2
3.0 Installation: Pipe fittings 3
3.1 Location of Fitting 3
4.0 Overview of 2551 Display versions 4
5.0 Wiring 5
5.1 Basic Wiring 5
5.2 Wiring: Mirror Relay 1 output 5
5.3 2551 and other manufacturer's instruments 5
5.4 Wiring to Signet Flow Instruments 6
5.5 Wiring Relays 7
6.0 View Menu 8
6.1 Resetting the Resetable Totalizer 8
6.2 Navigating the Menus 9
6.3 Keypad Functions 9
6.4 Security Code 9
7.0 Setup Menu 10
7.1 Averaging and Sensitivity 11
7.2 Bi-Directional Flow 12
7.3 Calibration Data 12
8.0 Calibration Menu 14
8.1 Volume method of calibration 14
8.2 Rate method of calibration 14
9.0 Relay Menus 15
9.1 Pulse Relay mode 15
9.2 Total Relay mode 15
9.3 High, Low, or Window Relay modes 16
10.0 Test Menu 17
11.0 Options Menu 17
11.1 Output Modes 17
12.0 Technical Information 18
12.1 Grounding 18
12.2 Maintenance 19
12.3 Troubleshooting 19
13.0 Ordering Information 20
FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT
IN THE SENSOR BEING EJECTED FROM THE PIPE!
• DO NOT USE ANY TOOLS ON THE RETAINING CAP.
HAND TIGHTEN ONLY.
• THE O-RINGS CAN BE LIGHTLY LUBRICATED TO
FACILITATE INSERTION INTO THE PIPE FITTING. DO
NOT USE PETROLEUM-BASED LUBRICANTS!
• DO NOT USE THREAD SEALANT OR LUBRICANTS ON
THE RETAINING CAP OR ON THE PLASTIC FITTING
THREADS.
• IF LEAKING IS OBSERVED FROM THE RETAINING CAP,
IT INDICATES DEFECTIVE OR WORN O-RINGS ON THE SENSOR. DO NOT ATTEMPT TO CORRECT BY FURTHER
TIGHTENING.
The O-rings can be lightly
lubricated to facilitate insertion
into the pipe fitting.
DO NOT USE petroleum-based
lubricants on O-rings!
DO NOT USE thread sealant
or lubricants on the fitting
threads.
Flow
Do not use any tools to
tighten the yellow retaining cap.
DO NOT USE thread sealant or
lubricants on retaining cap!
Contents
WARNING!

2 2551 Magmeter
Wetted Materials:
• Sensor body and Electrodes and Grounding ring:
• -P0, -P1, -P2: Polypropylene and 316L SS
• -T0, -T1, -T2: PVDF and Titanium
• -V0, -V1,-V2: PVDF and Hastelloy-C
• -W0, -W1, -W2: PVDF and 316L SS
• O-rings: FPM (standard)
EPDM, Kalrez® (optional)
The user is responsible for determining the chemical
suitability of these materials for a specific application.
• Case: PBT
• Display window: Polyamide
Power Requirements
• 4 to 20 mA: 21.6 to 26.4 VDC, 22.1 mA max.
400 mV p-p maximum ripple voltage
• Frequency: 5 to 26.4 VDC, 15 mA max.
• Digital: 5 to 6.5 VDC, 15 mA max.
• Auxiliary (only required for units with relays):
9 to 24 VDC, 0.4A max
• Reverse polarity and short circuit protected
Performance
• Pipe size range: DN15 to DN300 (½ to 12 in.)
• Flow Range Minimum: 0.05 m/s (0.15 ft/s)
(Bi-directional) Maximum: 10 m/s (33 ft/s)
• Linearity: ±1% of reading +0.01m/s (0.033 ft/s)
• Repeatability ±0.5% of reading @ 25°C (77°F)
• Minimum Conductivity: 20 μS/cm
Output Specifications
Current output (4 to 20 mA)
• Max Loop Resistance: 300Ω
• Loop Accuracy: 32 μA max. error (25°C @ 24 VDC)
• Temp. drift: ±1 μA per °C max.
• Power supply rejection: ±1 μA per V
• Isolation: Low voltage <48 VAC/DC
from electrodes and aux power
• Maximum cable: 300 m (1000 ft.)
• Error condition: 22.1 mA
Frequency output:
• Output modes: Freq, Freq÷10, or Mirror Relay 1
• Max. Pullup Voltage: 30 VDC
• Reverse Polarity Protected to -40 V
• Max. Current Sink: 50 mA, current limited
• Maximum cable: 300 m (1000 ft.)
Digital (S3L) Output:
• Serial ASCII, TTL level 9600 bps
• Compatible with Signet 8900
Standards and Approvals
• CE
• UL, CUL (for display versions with relays)
• NEMA 4X / IP65 Enclosure (with cap installed)
• EMC: EN55011: 1998 +A1:99+A2:02
Class B Emissions
EN61326: 1997 +A1:98+A2:01
EN61000-6-2:2001
• Safety: EN61010-1:2001
• U.S. Patent No. 7,055,396 B1
2.0 Specifications
40
80
120
160
200
3
6
8
11
14
0 40 80 120 160 200
-18 4 27 49 71 93
°F
°C
psi
bar
240
115
2551
Pressure vs. Temperature
Media Temperature
Operating Pressure
2551
Acceptable
Media Range
Dimensions
116.8 mm
(4.6 in.)
-XO
-X1
-X2
95.3 mm
(3.75 in.)
Pipe Range
1/2 to 4 in. -XO = 58 mm (2.3 in.)
5 to 8 in. -X1 = 91 mm (3.6 in.)
10 to 12 in. -X2 = 167 mm (6.6 in.)
X = Sensor Body P, T, V, or W
Relay Specifications
• Relay 1 and 2 Type: Mechanical SPDT
Rating: 5 A @ 30 VDC max., 5 A @ 250 VAC max.
• Relay 3 Type: Solid State
Rating: 50 mA @ 30 VDC, 50 mA @ 42 VAC
Hysteresis: Adjustable, plus timer delay
Trigger Delay: Adjustable (0 to 9999.9 sec.)
Relay Modes: Off, Low, High, Window, and Proportional Pulse
Relay Source: Flow Rate, Resettable Totalizer
Error Condition: Selectable; Fail Open or Fail Closed
Display
Characters: 2 x 16
Contrast: User-set in four levels
Backlighting (only on relay versions):
Requires external 9-24 VDC, 0.4 mA max.
Environmental Requirements
Storage Temperature:
-20° to 70°C (-4° to 158°F)
Relative Humidity :
0 to 95% (non-condensing)
Operating Temperature
• Ambient: -10° to 70°C (14° to 158°F)
• Media: 0° to 85°C (32° to 185°F)
Max. operating pressure:
10.3 bar @ 25°C (150 psi @ 77°F)
1.4 bar @ 85°C (20 psi @ 185°F)

32551 Magmeter
3.1 Installation: Selecting a Location
• The 2551 requires a full pipe and a fully developed turbulent flow profile for accurate
measurement.
• If the piping system harbors air pockets or bubbles, take steps to locate the sensor so
the air pockets will not contact the electrodes.
• In vertical installations, assemble the 2551 so the conduit ports are facing downward.
This prevents condensation inside the conduit from being directed into the 2551
electronics housing.
• Chemical injection systems can temporarily alter the fluid conductivity and cause
anomalies in the magmeter measurement.
To avoid this problem, install the magmeter UPSTREAM of the injection point.
15 x I.D. 5 x I.D.
Reducer
+GF+
10 x I.D. 5 x I.D.
Inlet Outlet
Flange
+GF+
50 x I.D. 5 x I.D.
Valve/Pump
+GF+
40 x I.D. 5 x I.D.
2 x 90° Elbow
3 dimensions
+GF+
25 x I.D. 5 x I.D.
2 x 90° Elbow
+GF+
20 x I.D. 5 x I.D.
90° Elbow
+GF+
+GF+
+GF+
+GF+
+GF+
+GF+
+GF+
O.K.O.K. O.K.
Vertical flow is OK IF the pipe remains full at all times.
3. Installation: Pipe fittings
Georg Fischer offers a wide selection of installation fittings that control the position of the Magmeter electrodes in relation to the
dimensions of the pipe. You will find a complete list of order numbers for installation fittings in the Calibration Tables on pages 12-13.
Select a location with sufficient
distance of straight pipe immediately
upstream of the sensor.
Locating the sensor in a trap or where the
flow is upward helps to protect the sensor
from exposure to air bubbles when the
system is in operation.
These configurations are not
recommended because it is difficult to
keep the pipe full.
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
0.5 to 4 inch versions
PVC or CPVC
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
Available in 10 and 12 inch sizes only
Cut 2-1/8 inch hole in pipe
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
tees
PVC
Saddles
Iron
Strap-on
saddles
PVC
Glue-on
Saddles
PP
Clamp-on
Saddles
1.5 in. to 8 in. PVDF insert
> 8 in. PVC insert
Fiberglass
tees &
saddles:
FPT FPS
0.5 to 2 in. versions
Mounts on threaded pipe ends
In a gravity-flow system, the tank must be
designed so the level does not drop below the
outlet.
This causes the pipe to draw air in from the tank.
If air bubbles pass across the Magmeter
electrodes, the output will become erratic.
+GF+
Flow
Flow6.25 GPM
Total1234567.8>
ENTER
Signet Flow
Transmitter
Flow6.25 GPM
Total1234567.8>
ENTER
Signet Flow
Transmitter
Flow

4 2551 Magmeter
4.0 Overview of 2551 Display Magmeter
2551 Display Magmeters use a dual-sided electronics module and dual conduit ports. Unused ports must be sealed to protect the
electronics from water damage.
1. The lower set of conduit ports provide access to the wiring terminals for:
• Loop Power
• Flow Output Signal (current loop, frequency or Mirror Relay 1 output).
2. The upper set of conduit ports provide access to the wiring terminals for:
• Relay output wiring
• Auxiliary power for relay coils and display backlight
3. The sensor is marked with a directional arrow to indicate the direction identified as forward flow.
An adhesive decal is also provided that can be affixed to the pipe to indicate the direction of forward flow.
Flow in the opposite direction from the arrow will be identified as reverse flow on the display by a "-" symbol.
4. The terminals in the magmeter are designed to accomodate 16 to 22 AWG conductors.
5. The display includes two LEDs that light when Relay 1 or Relay 2 are activated.
• All three relays can be monitored by scrolling to the Relay Status display located in the View menu.
• If the Language option has not been made, new magmeters will always open with the Select Language display.
6. The part number, serial number and output type are identified on the electronics module.
Language
English >
4-20 mA output
Digital output
Frequency output
Mirror relay 1 output
Relay 1
Relay 2
NO1
NO2
NO3
NC1
NC2
NC3
C1
C2
C3
V+
V-
Relay 3
Aux Pwr
Relay output
Aux power
Signet Magmeter
RELAY 1 RELAY 2
ENTER
420 GPM
123456.78 >
4-20/freq out
s/n 60504201234
60504201234
p/n 3-2551-11
3-2551-11
2.
3.
4.
5.
6.
4.
1
2
3
4
1.

52551 Magmeter
5.0 Wiring
5.1 Basic Wiring
2551 Magmeter
4.5-26.4
VDC
Relay 1
Relay 2
NO1
NO2
NO3
NC1
NC2
NC3
C1
C2
C3
Relay 3
V+
V-
+ VDC
- VDC
Aux Pwr
3
Frequency Out
Frequency ÷ 10 Out
(5 to 26.4 VDC)
**********************
Digital (S L) Out
(4.5 to 6.5 VDC)
1
2
3
4
Auxiliary Power for:
Display backlighting
Relay Coils
Ground
Signal
1
2
3
4
5-24 VDC
Ground
Not used
Open Collector Out
2551 Magmeter
4-20 mA output
The 3-2551-22 and 3-2551-42 Magmeters provide a passive 4-20
mA loop output.
• External loop power (24 VDC) is required.
• Factory standard calibration is 4 - 20 mA = 0 - 5 m/s.
• The 4-20 mA output can be spanned to any range, from -10
m/s to +10 m/s.
• AUX PWR must be connected to power the display
backlighting and to power to the relay coils if included.
5.2 Wiring: Mirror Relay 1 output
The 3-2551-21 and -41 Magmeter can be configured to provide
an Open Collector output in lieu of the sensor signal provided
by Frequency or Digital output selections. The Open Collector
Output can be programmed via the Relay 1 menu.
Frequency output
• 3-2551-21 and 3-2551-41 Magmeters may be programmed
to provide an open collector FREQUENCY output.
• The maximum frequency output is 1000 Hz (@ 10 meters per
second)
• If the Frequency ÷ 10 output is selected, the maximum
frequency is 100 Hz (@ 10 meters per second)
• AUX PWR must be connected to power the display
backlighting and to power the relay coils if included.
5.3 2551 and other manufacturer's instruments
When using the 2551 in a system with other manufacturer's
equipment, a pull-up resistor may be required to power the open
collector output.
1
2
3
4
Frequency Out
2551 Magmeter
24 VDC
Relay 1
Relay 2
NO1
NO2
NO3
NC1
NC2
NC3
C1
C2
C3
Relay 3
V+
V-
5-24 VDC
Ground
Ground
Aux Pwr
Sensr Gnd
(SHIELD)
Sensr IN
(RED)
Non-Signet Flow Instrument
Ground
Frequency Input
5-24 VDC Out
Auxiliary Power for:
Display backlighting
Relay Coils
10 KΩ
Pull-up Resistor
2551 Magmeter
Relay 1
Relay 2
NO1
NO2
NO3
NC1
NC2
NC3
C1
C2
C3
Relay 3
V+
21.6 to 26.4 VDC
V-
+ VDC
- VDC
Aux Pwr
4-20 mA Loop Output
1
2
3
4
Auxiliary Power for:
Display backlighting
Relay Coils
420

6 2551 Magmeter
-
+
12-24 V
10 W
12-24 V
10 W
4-20
mA
Total
reset
AUX
output
PLS
output
12
Gnd -
+
+
+Gnd
Freq. IN
Sen. Pwr.
Freq. IN
Iso. Gnd
Std. Sensor
Open Collector
Sensor
1
2
3
4
Frequency Out
2551 Magmeter
24 VDC
Relay 1
Relay 2
NO1
NO2
NO3
NC1
NC2
NC3
C1
C2
C3
Relay 3
V+
V-
5-24 VDC
Ground
Ground
Aux Pwr
Signet 5075, 5500, 5600
Auxiliary Power for:
Display backlighting
Relay Coils
2551 and 8900 Multi-Parameter Controller: Frequency Out
2551 and ProPoint 5075, 5500, 5600
2551 and ProcessPro 8550 Flow Transmitter
When connecting the 2551 to any 8550 model, the AUXILIARY power in the 8550 must always be connected.
8550-1 Flow Transmitter
1
2
3
4
Frequency Out
2551 Magmeter
Output -
Output +
System Pwr
Loop -
System Pwr
Loop +
AUX
Power -
AUX
Power +
4
3
2
1
6
5
9
8
7
Open Collector
Output Sensor Input
from
Magmeter
Terminals 3-4: 4-20 Loop, Loop Power
Terminals 1-2: Auxiliary Power
Sensr Gnd
(SHIELD)
Sensr IN
(RED)
Sensr V+
(BLACK)
To
12-24 VDC
Power Source
24 VDC
V+
V-
5-24 VDC
Ground
Ground
Aux Pwr
5.4 Wiring to Signet Flow Instruments
3-8900.621C
I/O Module 3-8900.401-X 1
2
3
4
5
6
7
8
9
10
11
12
13
14
+5VDC (Black)
Freq. Input (Red)
GND (Shield)
+5VDC (Black)
Freq. Input 2 (Red)
S L (Red)
GND (White/Shield)
+5VDC (Black)
S L (Red)
GND (White/Shield)
3
3
Analog Output 1
Analog Output 2
(if applicable)
(if applicable)
Frequency
Input
1
Frequency
Input 2
OR
S3L
Input
2
S3L
Input
1
+
-
+
-
1
2
3
4
Frequency Out
2551 Magmeter
24 VDC
Relay 1
Relay 2
NO1
NO2
NO3
NC1
NC2
NC3
C1
C2
C3
Relay 3
V+
V-
5-24 VDC
Ground
Ground
Aux Pwr
Auxiliary Power for:
Display backlighting
Relay Coils
3-8900.621C
I/O Module 3-8900.401-X 1
2
3
4
5
6
7
8
9
10
11
12
13
14
+5VDC (Black)
Freq. Input (Red)
GND (Shield)
+5VDC (Black)
Freq. Input 2 (Red)
S L (Red)
GND (White/Shield)
+5VDC (Black)
S L (Red)
GND (White/Shield)
3
3
Analog Output 1
Analog Output 2
(if applicable)
(if applicable)
Frequency
Input
1
Frequency
Input 2
OR
S3L
Input
2
S3L
Input
1
+
-
+
-
1
2
3
4
Digital (S L ) Out
2551 Magmeter
24 VDC
Relay 1
Relay 2
NO1
NO2
NO3
NC1
NC2
NC3
C1
C2
C3
Relay 3
V+
V-
5-24 VDC
Ground
Ground
Aux Pwr
3
Auxiliary Power for:
Display backlighting
Relay Coils
2551 and 8900 Multi-Parameter Controller: Digital Out

72551 Magmeter
Relay 3 is a solid state relay. It can be applied exactly the same as a dry
contact relay, but the current rating is 0.2 A (200 mA) maximum. Relay 3 is
best suited to pulse applications and low voltage loads.
Relays 1 and 2 are dry contact relays rated for 5 A maximum current.
Relays 1 and 2 are best suited for switching high voltage loads, such as AC
powered pumps and valves.
When used to switch inductive loads, dry contact relays may be damaged by
arcing. Signet recommends the installation of a filter device to prevent such
damage.
3-8050.396 159 000 617 RC Filter kit (for relay use)
Relay 3 Type: Solid State
Rating: 50 mA @ 30 VDC, 50 mA @ 42 VAC
Relay 1, Relay 2 Type: Mechanical SPDT
Rating: 5A @ 30 VDC max., 5 A @ 250 VAC max
5.5 Wiring Relays
Relay 1
Relay 2
Solid State Relay 3:
50 mA max @ 30 VDC
50 mA max @ 42 VAC
NO1
NO2
NO3
NC1
NC2
NC3
C1
C2
C3
V+
V-
Auxiliary Power
9 to 24 VDC
0.4 A Maximum
Mechanical Relays:
5A @ 250 VAC
5A @ 30 VDC
Relay 3
Auxiliary power must be connected to operate the relays and to
power the display backlighting. Auxiliary power is fully isolated.
The Loop Power supply may be used for Aux power if the power
source provides a sufficient current rating.
Relay Terminal Legend:
NO: Normally Open
NC: Normally Closed
C: Common
Application Notes: Relay Wiring
• Inductive relay loads may generate transient voltage spikes well in excess of the relay contact ratings. This will cause arcing
across the contacts and consequently rapid relay wear. Signet recommends a RC-style filter (“snubber”), installed as illustrated
here.
• The filter kit (3-8050.396) is available as an accessory item. See ordering information on back cover.
• Signet product warranty does not cover damage to relays due to contact burnout.
Relay 1
Relay 2
Solid State Relay 3:
50 mA max @ 30 VDC
50 mA max @ 42 VAC
NO1
NO2
NO3
NC1
NC2
NC3
C1
C2
C3
V+
V-
Auxiliary Power
9 to 24 VDC
0.4 A Maximum
Mechanical Relays:
5A @ 250 VAC
5A @ 30 VDC
Relay 3
3-8050.396
AC-powered:
Pumps
Alarm lamps
Audio alarms
Mixers 120-240 VAC
Definition:
An inductive load is an electrical device generally made of wire
that is coiled to create a magnetic field to produce mechanical
work when energized.
Examples of inductive loads include motors, solenoids, and
relays.
High voltage transients from these types of loads can cause
arcing across mechanical switching contacts or can cause
damage to solid-state contacts.

8 2551 Magmeter
6.0 View Menu
The VIEW menu contains all of the basic information available from the magmeter.
• The normal operating display shows the FLOW RATE on the top line of the display
and the Resetable Totalizer on the lower line of the display.
• The Right Prompt symbol (>) always indicates a sub-menu associated with the current
display. In this display it points the way to the TOTALIZER RESET function. See
section 6.1 for detailed instructions.
• With AUXILIARY power connected to the magmeters with Relays, the display will be
backlit. There is no switch to turn the backlight off.
• A flashing character or text on the display indicates that the item is being edited.
This manual uses a (red) star to illustrate a flashing display.
• The following information is viewed by scrolling UP or DOWN. These displays will
remain in the display for 10 minutes, then the normal operating display will return.
1. From the normal operating display, press the RIGHT arrow key.
3. Press any arrow key to toggle the flashing selection from NO to YES.
4. Press the ENTER key. The totalizer will reset to 000000.00 and the display will immediately
return to the normal operating display.
2. The resetable totalizer can be configured to require the security code before allowing the
reset. If the Total Reset set to "RESET OFF" this display will not appear.
See section 11, Options Menu for instructions.
6.1 Resetting the Resetable Totalizer
Signet Magmeter
RELAY 1 RELAY 2
ENTER
1234.56 GPM
876543.21 >
Show the permanent total. This totalizer cannot be
reset.
Relay States shown for units with a relay board.
This display is a reminder to visit the Signet website for
updates and information about Signet products.
Enter menus from this display. See section 6.2.
Shows the current output. For 4-20 mA Output models
only.
123456.78 GPM
000000.00 >
1234.56 GPM
876543.21 >
Enter Code
0000
Reset Total ?
Yes No
Signet Magmeter
RELAY 1 RELAY 2
ENTER
1234.56 GPM
876543.21 >
Gallons
Perm 876543.21
Current Output
14.89 mA
Relay 1 2 3
Off Off Off
Web Site
www.gfsignet.com
Enter Menu
>

92551 Magmeter
6.2 Navigating the Menus
6.4 Security Code
The 2551 has a security code that can be programmed to any
four digit numerical value.
• The factory setting is 0-0-0-0.
• To program the security code go to the Options menu.
• The security code will be required to edit any of the items in
the menus. It is required only once for each editing session.
• Record the custom security code here or in a safe location.
• If the security code is lost, contact your Signet service center
for instructions.
Enter Code
0000
Scrolls UP through any menu.
If the display shows any flashing character or selection,
scrolls UP to the previous value or selection.
Scrolls DOWN through any menu.
If the display shows any flashing character or selection,
scrolls DOWN to the next value or selection.
Press the UP and DOWN keys together to abandon any
unsaved edits and return to the previous display.
Opens the menu currently being displayed.
In Edit modes, advances the flashing character.
In menus with only two options (Yes or No, On or Off)
toggles between selections.
Saves a new selection in any menu.
From Normal Operation display, jumps to first selection
in Menu directory (when held for three seconds)
ENTER
Normal Operation Display
The normal operating display shows the Flow Rate on the top line and the Resetable
Totalizer on the bottom line.
• All menu instructions in this manual assume that the instrument is showing this
display.
Calibration Menu
The Calibration menu provides two different methods for adjusting the calibration. See
section 8.0 for details related to this menu.
Relay Menus
Each of the available relays in the 2551-21 and -22 are programmed from their own
dedicated menu. See section 9 for details related to these menus.
Note: Menu items associated with Relay 2 and relay 3 are suppressed in models without
relays. See section 9.0 for details related to this menu.
Test Menu
The Test menu is used to manually toggle relays or to induce a known value out of the
4-20 mA terminals. See section 10.0 for details related to this menu.
Options Menu
The Options menu contains those settings and values that are usually programmed during
the initial installation, and then seldom modified, including the SECURITY CODE (see
section 6.4). See section 11.0 for details related to the Options menu.
Setup Menu
This menu contains all of the settings and information that the magmeter requires to
operate, including the K-factor, the totalizer settings, low flow cutoff, and several display
2551 Menu Directory
The 2551 magmeter uses seven main menus to provide access to the calibration and
programming features. Each menu serves a specific function.
Starting from the normal operating display, there are two ways to access the menus:
1. Press the UP arrow key to scroll to the Enter Menu display, then press the RIGHT
arrow key.
2. Press the ENTER key and hold it for about three seconds.
Security Code ______ ______ ______ ______
Enter Menu
Setup >
Enter Menu
Calibration >
Enter Menu
Relay 1 >
Enter Menu
Relay 2 >
Signet Magmeter
RELAY 1 RELAY 2
ENTER
1234.56 GPM
876543.21 >
Enter Menu
Relay 3 >
Enter Menu
Test >
Enter Menu
Options >
Enter Menu
> 3s
ENTER
Or
6.3 Keypad Functions
WRITE IT DOWN!

10 2551 Magmeter
K-Factor
060.000 >
K-Factor: See the charts in section 7.3 for values in pulses per U.S. Gallon or in pulses per
Liter. To use other units, convert the published values as appropriate.
Pipe Size: Select the pipe size that is nearest to the nominal pipe size.
Averaging: Set the averaging period based on the installation and flow conditions. Smaller
values allow the 2551 to respond to changes in flow rate quickly, while larger values smooth
the fluctuations caused by installation and flow conditions. See section 7.1 for details.
7.0 Setup Menu
Flow Units: Set the units for the application. Four characters are available. The first three characters can be set to any symbol or
alpha character, upper or lower case. The following special symbols are located between the upper case and lower case menus:
• (centered dot) μ(micro) _ (blank)
- (dash) / (slash) 3 (for cubic units)
The last character selects the timebase for the flow rate measurement.
Select S/s (seconds) M/m (minutes), H/h (hours) or D/d (days)
Total Factor: Set the factor by which the totalizer will count. This setting is made in the
application units (ie; gallons, liters, etc..)
Totalizer Units: Set the Totalizer Units. This setting serves as a label for the totalizer displays
only. It has no effect on the measurement. The special characters listed in the Total Factor
settings are available here also.
Low Flow Cutoff: Set a flow rate that the 2551 Magmeter will use as a minimum threshhold.
If the flow rate falls below this value, the 2551 will respond as if the flow were zero.
Sensitivity: Set a percentage of maximum range by which the flow must change to override
the averaging feature and "jump" quickly to the new flow rate. See detailed explanation in
section 7.1.
Signet Magmeter
RELAY 1 RELAY 2
ENTER
Enter Menu
Setup >
The Setup menu contains all of the parameters necessary for the 2551 Magmeter to begin
measuring flow.
NOTE: The Security Code must be entered before any changes can be made to the Setup menu.
See the Options menu in section 11 for details.
The values shown for each menu item represent the factory
standard setting. All 2551 magmeters are packaged with these
settings.
Set 4 mA: In the 2551-22 and 2551-42 versions only, set the flow rate where the current
output will be 4 mA.
Set 20 mA: In the 2551-22 and 2551-42 versions only, set the flow rate where the current
output will be 20 mA.
The 4-20 mA output may be spanned to monitor forward and reverse flow rates.
ENTER
Pipe Size
2” DN50 >
Sensitivity
100% >
Flow Units
GPM >
Set 4 mA
-100 GPM >
Set 20 mA
100.00 GPM >
Total Factor
1000.0 >
Totalizer Units
Gallons >
Low Flow Cutoff
0.5 GPM >
Averaging
25 secs >
Use the keypad to navigate through each setting.
Enter Code
0000

112551 Magmeter
Sensitivity
• The SENSITIVITY setting determines how the 2551
responds to sudden surges in the flow rate. It "overrides"
the Averaging function just long enough to allow an actual
change in flow rate to be displayed, then resumes the
averaging. The result is a smooth flow display and a quick
response to large shifts in the flow rate.
The settings for Sensitivity represent a percentage of the
magmeter's maximum range, or 10 m/s.
Example: A sensitivity setting of 25% means that the flow
rate must change instantly and by more than 2.5 m/s before
the function is enabled.
NOTE: The SENSITIVITY function is ineffective if the Averaging
function is set to zero.
No Averaging
With AVERAGING set to zero, the flow rate will be displayed
immediately and with no filtering. This line represents the
actual output of the flow sensor as it responds to unstable flow
conditions in the pipe.
Averaging Only
With AVERAGING set to 50 seconds and SENSITIVITY still set to
zero the flow rate is stabilized, but a sharp change in flow rate is
not represented on the display or at the output for 50 seconds or
longer.
Averaging and Sensitivity
With AVERAGING at 50 seconds and SENSITIVITY set to
25%, the flow rate is stabilized, while the sudden shift in flow is
reflected very quickly.
Averaging
• The AVERAGING setting dictates the time over which the
magmeter will average the flow signal.
The LCD display is updated every second. With averaging at
14 seconds, the flow rate on the display is an average of the
previous 14 seconds input.
Short averaging times provide the fastest display and output
response to changes in the flow rate.
Higher averaging times help to smooth the display and
current output where the flow in the pipe is erratic or unstable
due to installation limitations.
10 s 20 s 30 s 40 s 50 s 60 s 70 s
Time
Velocity
10 s 20 s 30 s 40 s 50 s 60 s 70 s
Time
Velocity
10 s 20 s 30 s 40 s 50 s 60 s 70 s
Time
Velocity
Even the most carefully engineered flow systems may experience
erratic and unstable conditions. If the instability is communicated
to the output functions, the results may create problems for
control devices.
To alleviate these issues, the 2551 provides two adjustments that
operate in tandem. The information here will help in determining
the appropriate settings for any specific application.
7.1 Averaging and Sensitivity
CAUTION
The SENSITIVITY function changes the response
characteristics of the magmeter. If used as part of a
tuned closed loop control system such a change may be
undesirable.

12 2551 Magmeter
7.3 Calibration Data: K-factors
7.2 Bi-Directional Flow
• The 2551 magmeter is designed to measure bi-directional flow.
• The forward flow direction is indicated by the directional arrow molded into the side of the 2551 sensor.
• The conduit ports are assembled at the factory to point UPSTREAM. They may be reversed by
disassembling the components of the magmeter and reassembling.
Flow Rate Display: The "+" sign is suppressed during forward flow.
"-123.45 GPM" during reverse flow.
Totalizer Display: The totalizer will count during forward flow conditions only.
During reverse flow the totalizer will not increment.
Relay Outputs: May be set to detect reverse flow: "Low Setpoint at -25 GPM."
4-20 mA output: May be scaled to span any flow range:
For example: "4 to 20 mA = -100 GPM to +100 GPM"
Frequency output, Frequency ÷ 10 output: Reverse flow is processed same as forward flow in the frequency output magmeters.
Digital (S3L) output: Reverse flow results in 0 flow rate output.
Flow
PVC Tees and Saddles
PIPE SIZE FITTING K-Factor K-Factor
(IN.) TYPE Gallons Liters
SCH 80 PVC TEES FOR SCH 80 PVC PIPE
½ PV8T005 2289.37 604.85
¾ PV8T007 1430.41 377.92
1 PV8T010 876.86 231.67
1¼ PV8T012 447.06 118.11
1½ PV8T015 324.19 85.65
2 PV8T020 206.69 54.61
2½ PV8T025 131.46 34.73
3 PV8T030 82.52 21.80
4 PV8T040 44.78 11.83
SCH 80 PVC TEES FOR SCH 80 CPVC PIPE
½ CPV8T005 2496.03 659.45
¾ CPV8T007 1381.48 364.99
1 CPV8T010 857.98 226.68
1¼ CPV8T012 445.17 117.61
1½ CPV8T015 325.56 86.01
SCH 80 PVC SADDLES FOR SCH 80 PVC PIPE
2 PV8S020 193.83 51.21
2½ PV8S025 138.01 36.46
3 PV8S030 83.89 22.16
4 PV8S040 40.88 10.80
6 PV8S060 22.53 5.95
8 PV8S080 12.52 3.31
10 PV8S100 7.94 2.10
12 PV8S120 5.71 1.51
SCH 80 PVC SADDLES FOR SCH 40 PVC PIPE
2 PV8S020 180.01 47.56
2½ PV8S025 123.72 32.69
3 PV8S030 75.81 20.03
4 PV8S040 41.87 11.06
6 PV8S060 19.71 5.21
8 PV8S080 11.73 3.10
10 PV8S100 7.43 1.96
12 PV8S120 5.23 1.38
Carbon Steel Tees and Weld-o-Lets
Stainless Steel Tees and Weld-o-Lets
Galvanized Iron Tees
PIPE SIZE FITTING K-Factor K-Factor
(IN.) TYPE Gallons Liters
CARBON STEEL TEES ON SCH 40 PIPE
½ CS4T005 1572.66 415.50
¾ CS4T007 1086.73 287.11
1 CS4T010 582.34 153.86
1¼ CS4T012 377.48 99.73
1½ CS4T015 267.79 70.75
2 CS4T020 167.85 44.35
STAINLESS STEEL TEES ON SCH 40 PIPE
½ CR4T005 1601.26 423.05
¾ CR4T007 937.78 247.76
1 CR4T010 606.18 160.15
1¼ CR4T012 279.68 73.89
1½ CR4T015 147.65 39.01
2 CR4T020 111.90 29.56
STAINLESS STEEL WELDOLETS ON SCH 40 PIPE
2½ CR4W025 106.31 28.09
3 CR4W030 72.27 19.09
4 CR4W040 36.84 9.73
5 CR4W050 29.28 7.73
6 CR4W060 20.29 5.36
8 CR4W080 11.73 3.10
10 CR4W100 7.45 1.97
12 CR4W120 5.24 1.39
CARBON STEEL WELDOLETS ON SCH 40 PIPE
2½ CS4W025 105.70 27.93
3 CS4W030 70.68 18.67
4 CS4W040 36.38 9.61
5 CS4W050 29.28 7.73
6 CS4W060 20.29 5.36
8 CS4W080 11.73 3.10
10 CS4W100 7.45 1.97
12 CS4W120 5.24 1.39
GALVANIZED IRON TEES ON SCH 40 PIPE
1 IR4T010 558.50 147.56
1¼ IR4T012 334.45 88.36
1½ IR4T015 248.97 65.78
2 IR4T020 146.00 38.57

132551 Magmeter
7.3 Calibration Data: K-factors
Polypropylene True Union Tees and Wafers
Polypropylene Clamp-on Saddles
PVDF True Union Tees
PVC True Union Tees
PIPE SIZE FITTING K-Factor K-Factor
(Metric) TYPE Gallons Liters
POLYPROPYLENE FITTINGS (DIN/ISO ,BS, ANSI)
DN15 PPMT005 2192.73 579.32
DN20 PPMT007 1327.81 350.81
DN25 PPMT010 737.16 194.76
DN32 PPMT012 453.46 119.81
DN40 PPMT015 275.03 72.66
DN50 PPMT020 164.17 43.35
POLYPROPYLENE CLAMP-ON SADDLES ON SCH 80 PP PIPE
10 PPS100 7.94 2.10
12 PPS120 5.71 1.51
POLYPROPYLENE CLAMP-ON SADDLES ON SCH 40 PP PIPE
10 PPS100 7.43 1.96
12 PPS120 5.23 1.38
PVDF FITTINGS (DIN/ISO ,BS, ANSI)
DN15 SFMT005 1946.49 514.26
DN20 SFMT007 1158.05 305.96
DN25 SFMT010 749.09 197.91
DN32 SFMT012 439.51 116.12
DN40 SFMT015 248.93 65.77
DN50 SFMT020 146.85 38.80
PVC FITTINGS (DIN/ISO ,BS, ANSI)
DN15 PVMT005 2067.76 546.30
DN20 PVMT007 1136.61 300.29
DN25 PVMT010 716.52 189.31
DN32 PVMT012 446.07 117.85
DN40 PVMT015 278.83 73.67
DN50 PVMT020 159.36 42.10
Iron Saddles
PIPE SIZE FITTING K-Factor K-Factor
(IN.) TYPE Gallons Liters
SCH 80 IRON SADDLE ON SCH 80 PIPE
2 IR8S020 194.85 51.48
2½ IR8S025 142.28 37.59
3 IR8S030 87.53 23.13
4 IR8S040 40.62 10.73
5 IR8S050 29.28 7.74
6 IR8S060 22.30 5.89
8 IR8S080 12.52 3.31
10 IR8S100 7.94 2.10
12 IR8S120 5.65 1.49
SCH 80 IRON SADDLE ON SCH 40 PIPE
2 IR8S020 185.35 48.97
2½ IR8S025 127.47 33.68
3 IR8S030 76.62 20.24
4 IR8S040 40.23 10.63
5 IR8S050 27.32 7.22
6 IR8S060 19.71 5.21
8 IR8S080 11.61 3.07
10 IR8S100 7.36 1.94
12 IR8S120 5.18 1.37
Bronze and Copper Tees and Brazolets
PIPE SIZE FITTING K-Factor K-Factor
(IN.) TYPE Gallons Liters
BRONZE TEES ON SCH 40 PIPE
1 BR4T010 582.34 153.86
1¼ BR4T012 330.54 87.33
1½ BR4T015 254.76 67.31
2 BR4T020 157.36 41.58
COPPER TEES FITTING ON COPPER PIPE SCH K
½ CUKT005 2459.19 649.72
¾ CUKT007 1108.02 292.74
1 CUKT010 649.87 171.70
1¼ CUKT012 422.03 111.50
1½ CUKT015 281.43 74.35
2 CUKT020 136.02 35.94
COPPER TEES FITTING ON COPPER PIPE SCH L
½ CUKT005 2406.30 635.75
¾ CUKT007 1174.77 310.37
1 CUKT010 672.28 177.62
1¼ CUKT012 402.84 106.43
1½ CUKT015 294.99 77.94
2 CUKT020 149.63 39.53
COPPER/BRONZE BRAZOLET ON SCH 40 PIPE
2½ BR4B025 117.31 30.99
3 BR4B030 78.62 20.77
4 BR4B040 45.13 11.92
5 BR4B050 32.79 8.66
6 BR4B060 22.73 6.01
8 BR4B080 13.14 3.47
10 BR4B100 8.34 2.20
12 BR4B120 5.87 1.55

14 2551 Magmeter
8.0 Calibration Menu
The K-factors published in this manual assume that the flow conditions in the pipe are
ideal.
Many factors that affect the flow rate are beyond the control of the magmeter; variations in
actual pipe dimensions, pipe smoothness, and other flow conditions will contribute to the
total system error.
Performing a custom calibration with the magmeter in place will adjust the K-factor and
can serve to compensate for installation conditions that may be less than ideal.
Select one of the calibration methods in this menu to achieve the most accurate
measurement possible in a specific application.
At START, the 2551 begins counting the flow past the sensor.
At STOP, the 2551 stores the total flow accumulated since the START.
Enter the VOLUME that has been pumped past the sensor.
This error message appears if volume entered or the accumulated flow is zero. Repeat the
test after checking the system.
Using the information from the RATE MATCHING method, the 2551 will recalculate a new K-
Factor. Press ENTER to accept the new value, or use the keypad to adjust the value.
The flow rate shown is based on the existing calibration of the 2551.
Use the keypad to modify the flow rate to match the reference meter. The 2551 will
automatically calculate a new K-cactor based on the new flow rate.
This message appears if the new K-Factor is less than 0.0001 or greater than 999999.
To correct the problem, reexamine the flow rate and make certain it is accurate.
8.2 Rate method of calibration
Use this method if the 2551 Magmeter must be calibrated to match a reference flow meter. This is the method most commonly used by
monitoring agencies, and for large pipes where volumetric calibration is impractical. The accuracy of this calibration method is largely
dependent on the accuracy of the reference meter and the proximity of the reference to the Signet 2551 Magmeter.
8.1 Volume method of calibration
Use the volume method of calibration if the fluid passing the magmeter can be measured by a volumetric method (as in a vessel of
known volume, or by weight). It requires the ability to pump a known volume of water past the magmeter, and then input the volume
into the 2551 program. It is most useful for small pipes and lower flow rates.
When performed properly, volumetric calibration is the most accurate method. For best results a five minute test period is
recommended, and the test period should be no less than two minutes.
Press Enter
To Start
Enter Volume
000000. GPM
K-Factor
45.6789
Value must be
more than 0.0
K-Factor
Out of Range
Press Enter
To Stop
Using the information from the VOLUME method, the 2551 will recalculate a new K-Factor. Press
ENTER to accept the new value, or use the keypad to adjust the value.
This message appears if the new K-Factor is less than 0.0001 or greater than 999999.
To correct the problem, perform the volumetric flow again, and be certain that the volume
entered is accurate.
Enter Menu
Setup >
Enter Menu
Calibration >
Signet Magmeter
RELAY 1 RELAY 2
ENTER
1234.56 GPM
876543.21 >
Enter Menu
> 3s
ENTER
Or
Set New Flowrate
45.6789
K-Factor
56.7890
K-Factor
Out of Range
NOTE: The Security Code must be entered
before selecting the calibration method.
Enter Code
0000

152551 Magmeter
9.0 Relay Menus
Magmeter models 3-2551-21 and 3-2551-22 have two dry contact
relays (Relays 1 and 2) and one Solid State relay (Relay 3).
Any of these relays can be set to any of the operating modes
listed below.
The setpoint values for HIGH, LOW and WINDOW modes can be
set to negative values if required.
For example, a LOW alarm might be set to activate if the flow rate
falls below -10 GPM.
Negative values are not available for relays in PULSE or TOTAL
modes.
Off: If a relay is not used, it can be turned Off to prevent
contact wear.
9.2 Total Relay mode
Program a relay to activate when the Resetable totalizer reaches a specific value. The maximum setting is 999999.
Application example: A filter must be replaced in a R.O. system every 10000 gallons. The service representative that installs a new
filter sets relay 3 to Total mode, sets the setpoint at 10000 and resets the totalizer to 000000.00. When the totalizer is reset, the relay
will be deactivated and the process begins anew.
Every time the Totalizer reaches 10000, the relay activates and lights a message indicator to remind the operator to contact the service
representative to replace the filter.
9.1 Pulse Relay mode
Program a relay to activate for a fixed period, for each volume of
fluid that passes the sensor.
For example, program the relay to pulse once for 100 ms for
every 3 gallons that pass by the sensor.
Relay 1 Mode
Pulse >
Relay 1 Width
0.1 secs >
Relay 1 Volume
0.0000 Gal >
Relay Volume: Set the volume of fluid that the 2551 must
measure before activating the relay for one pulse.
Pulse Width: Adjust the length of time the relay will remain
activated. The pulse width setting is dependent on the type of
external equipment being connected to the relay.
Relay 1 Mode
Total >
Relay 1 Set High
000000 >
Enter Menu
Setup >
Enter Menu
Calibration >
Enter Menu
Relay 1 >
Signet Magmeter
RELAY 1 RELAY 2
ENTER
1234.56 GPM
876543.21 >
Enter Menu
> 3s
ENTER
Or
NOTE: The Security Code
must be entered before
modifying the relay menu.
Enter Code
0000

16 2551 Magmeter
The values shown for each menu item represent the factory
standard setting. All 2551 magmeters are packaged with these
settings.
The menu repeats for Relay 2 and Relay 3.
Hysteresis
Time
Low Setpoint
Process
Relay activated
Relay deactivated
Hysteresis
Time
High Setpoint
Process
High Limit Hysteresis
Hysteresis
Window
Time
Low Limit
Process
9.3 High, Low, or Window Relay modes
Program the relay to activate when the flow rate reaches a setpoint (High or Low) or when the flow
rate moves outside of a prescribed range (Window).
Reverse Flow
The setpoint values for HIGH, LOW and WINDOW modes can be set to negative values if required.
For example, a LOW alarm might be set to activate if the flow rate falls to -10 GPM.
Set High: Set the flow rate where a High relay will be activated.
Set Low: Set the flow rate where a Low relay will be activated.
Hysteresis: Set a flow rate increment where the relay will be
deactivated. The hysteresis setting serves to prevent relay
"chatter" when the flow rate recovers from an alarm condition by
requiring the low rate to move substantially within the setpoint.
Delay: Set a time period for the relay to wait after reaching
the setpoint. This delay serves to prevent the relay "chatter" by
allowing the flow rate time to move back within the setpoint.
Relay 1 Mode
Low >
Relay 1 Mode
High >
Relay 1 Mode
Window >
Relay 1 Set Low
00.000 GPM >
Relay 1 Set High
00.000 GPM >
Relay 1 Set Low
00.000 GPM >
Relay 1 Hys
00.000 GPM >
Relay 1 Delay
0.1 secs >
Relay 1 Set High
00.000 GPM >
Relay 1 Hys
00.000 GPM >
Relay 1 Delay
0.1 secs >
Relay 1 Hys
00.000 GPM >
Relay 1 Delay
0.1 secs >
Enter Menu
Setup >
Enter Menu
Calibration >
Enter Menu
Relay 1 >
Signet Magmeter
RELAY 1 RELAY 2
ENTER
1234.56 GPM
876543.21 >
Enter Menu
> 3s
ENTER
Or
NOTE: The Security
Code must be entered
before modifying the
relay menu.
Enter Code
0000
Relay behavior with LOW Setpoint
Relay behavior with HIGH Setpoint
Relay behavior with WINDOW Setpoints

172551 Magmeter
11.0 Options Menu
The Options Menu contains those features and settings that will normally be set one time and then seldom changed. These include
language preference, decimal placement, Security Code assignment, etc.
Language
English >
Security Code
**** >
Contrast
2 >
Total Reset
Lock On >
Noise Rejection
60 Hz >
Flow Decimal
****.** >
Total Decimal
******.** >
Separator
ddd.d >
Output Mode
Frequency >
Signet Magmeter
RELAY 1 RELAY 2
ENTER
Enter Menu
Options >
Select from English, German, French or Spanish.
This Selection will be displayed at first power-up of a new magmeter.
Security Code can be set to any four digit number. Factory standard
setting is 0000.
Set for best view after the magmeter is installed. Larger number
means display appears darker.
Lock ON requires the Security Code before resetting the Resetable
Totalizer. Lock OFF reset with no security code.
Filters out common 50 or 60 Hz electrical noise.
Set the maximum resolution for the FLOW RATE display by limiting
the decimal to this point. The Flow Rate display will auto-scale from
this resolution up to whole units.
Set the maximum resolution for the TOTALIZER display by limiting
the decimal to this point. The Totalizer display will always show this
resolution.
Select decimal point or comma for use in numeric displays.
For Frequency/Digital models only: Select Freq output, Freq ÷ 10
output, Mirror Relay 1 output or S3L Digital output.
11.1 Output Modes
In FREQUENCY output mode, the 2551 serves as a traditional flow sensor and provides an output pulse that is compatible with all
Signet POWERED flow instruments. It is not compatible with the 5090 Self-Powered Flow Meter or the 8150-1 Battery-powered flow
totalizer. The frequency output range is from 0 Hz to 1000 Hz.
The FREQUENCY ÷ 10 output mode reduces the output frequency of the 2551 to a range that is useful for some programmable
logic controllers (PLC). The frequency output range is from 0 Hz to 100 Hz. This shift does not affect the stated accuracy of the 2551
Magmeter's frequency output.
The MIRROR RELAY 1 output mode allows 2551 Frequency/Digital models to use the Open Collector Output like a relay that can be
programmed via the Relay 1 menu.
If the magmeter is equipped with relays, this mode will mirror the settings of Relay 1.
If the magmeter is not equipped with relays, this mode can still be selected and programmed via the Relay 1 menu.
The S3L Digital output mode switches the 2551 to the Signet serial data output called S3L (Signet Serial Sensor Link). In this mode the
2551 can be added to the serial bus of the Signet 8900 Multi-Parameter Controller.
Shown for 4-20 mA models Only
Use the keypad to enter any current output from 4.0 mA minimum
to 22.1 mA maximum.
10.0 Test Menu
The Test menu provides a simple method to verify that the system is operating properly. Auxiliary power MUST be connected to the
2551 to activate the relays
Signet Magmeter
RELAY 1 RELAY 2
ENTER
Enter Menu
Test >
Test Output
4.20 mA >
Test Relay 1
Open Closed >
Test Relay 2
Open Closed >
Test Relay 3
Open Closed >
Shown for Relay models Only
Toggle any of these relays ON and OFF to verify that the system
is operating properly.
The values shown for each
menu item represent the
factory standard setting.
All 2551 magmeters are
packaged with these settings.
V+
V-
Auxiliary Power
9 to 24 VDC
0.4 A Maximum
Auxiliary power MUST be
connected to the 2551 to test
the relays.

18 2551 Magmeter
Grounding rings on plastic pipe
(Install between flanges)
or
metal straps on metal pipe
Earth ground
Sensor
Grounding ring
(10 cm to 1.3 m) (10 cm to 1.3 m)
4 in. to 50 in. 4 in. to 50 in.
Instrument
4.
2.2.
Do not terminate
shield at Magmeter
3.
1.
12.0 Technical Information
12.1 Grounding
Precalibration conditioning: The magmeter may appear to be unstable immediately after installation. Allow the sensor to sit in a full
pipe for 24 hours before beginning calibration and operation.
• Use a cable gland or a liquid tight connector to seal the cable ports from water intrusion.
• Use Teflon tape or a suitable sealant on cable ports.
• The 2551 magmeter must be carefully grounded to eliminate electrical noise that may interfere with the measurement.
• Grounding requirements will vary with each installation.
• The following recommendations should be applied in sequence until the interference is eliminated.
cThe ground terminal on the outside of the yellow housing is connected internally to the grounding ring at the tip of the sensor.
Connect a conductor (14 AWG/1.5 mm2 wire recommended) from this terminal directly to Earth ground to prevent electrical noise
from interfering with the magmeter signal.
If the interference persists, apply step #2:
dConnect grounding rings, metal clamps or grounding electrodes to the pipe immediately upstream and downstream of the
magmeter sensor location. These devices must be in contact with the fluid.
If the interference persists, apply step #3:
eThe shield from the output cable must be terminated at the remote instrument ONLY.
This shield must not be connected at both ends!
If the interference persists, apply step #4:
fConnect an additional wire (minimum AWG 14/1.5 mm2) from the remote instrument ground to the magmeter ground terminal.
Environmental Recommendations:
• When used properly, this product presents no inherent danger to the environment.
• Please follow local ordinance when disposing of this or any product with electronic components.
12.2 Maintenance
The 2551 Magmeter requires very little maintenance. There are no user-serviceable components in the magmeter.
• If the fluid contains deposits and solids that may coat the electrodes, a regular cleaning regimen is recommended.
• Do not use abrasive materials on the metal electrodes. Clean with soft cloth and mild detergent only.
• Use a cotton swab and mild detergent to remove deposits on the metal electrodes.

192551 Magmeter
• Connect 24 VDC ±10% connected to
loop terminals 1 and 3.
• The fluid is too clean for magmeter.
• Electronic component failure.
• 4-20 mA is not scaled properly.
• Magmeter installed too close to
upstream obstruction.
• Magmeter located in area exposed to
air bubbles/pockets.
• Magmeter is installed in pipe
backwards.
• Electrical noise is interfering with the
measurement.
• Electrodes are coated with deposits
or chemical oxide layers.
• Output is not 0 when flow is stopped.
• Output is erratic and unstable.
• No flow rate, current output is 22 mA.
• No 4-20 mA output.
• Electrodes not adequately conditioned
in fluid.
• Fluid is moving inside the pipe.
• Loop power not connected correctly.
Symptom Possible Cause Solution
• No Frequency output.
• No S3L output.
• Relocate the magmeter to have
straight uninterrupted pipe upstream
of the sensor for at least 10 x the pipe
diameter.
• Eliminate air bubbles in the pipe.
• Remove the magmeter and reinstall
with the flow direction arrow on the
sensor body pointed DOWNSTREAM.
• Review the grounding of the
magmeter and the pipe. Install
adequate Earth ground to allow the
magmeter to operate properly.
12.3 Troubleshooting
• Allow the sensor to sit in full pipe for
24 hours then restart.
• Increase the Low Flow Cutoff.
(section 7.0)
• Check and reset in the Setup Menu.
• 2551 is wrong model.
• Incorrect setting in Options Menu.
• Wiring is not correct.
• Frequency input to other
manufacturer's flow instrument does
not have pull-up resistor.
• Frequency/S3L model:
3-2551-21 (w/rlys)or -41 (w/o rlys)
• Select Frequency in the Options
menu.
• Check wiring, make corrections.
• Install 10kΩresistor. (section 5.1)
• Unsuitable application for magmeter.
• Return 2551 to factory.
• 4-20 mA current output is incorrect.
• Blank display, no backlighting, no
relay LEDS, but external equipment
using output signal is still working.
• 2551 AUX power is not connected. • Connect AUX power (section 5.5)
(9 to 24 VDC, 0.4 A max.)
• Error Message:
"Error Not Saved"
• Main power is below specification • Correct the main power deficiency
Troubleshooting with the RED and BLUE lights
No Lights:
The power is off or the sensor is not connected
Solid Blue:
The power is on but there is no flow in the pipe.
Blinking Blue:
Normal operation, blink rate is
proportional to the flow rate.
Alternating Red-Blue:
Empty pipe indication (electrodes
are not wet.)
Blinking Red:
System errors (Electrical noise
interference)
Solid Red:
Instrument error (defective
electronic component)
1
2
3
4
D7
D6
Flow Flow
Reverse flow:
• Frequency out cannot distinguish reverse flow from forward
flow. The output will be the absolute value.
• Digital (S3L) output: Reverse flow results in 0 flow rate
displayed on 8900
• 4-20 mA output can be spanned into negative flow range
using the custom setup tool. (example: 4-20 mA = -100 to
+100 GPM)
Empty Pipe Detection
• Frequency output will be locked to 0 Hz if electrodes are not
wet.
• Digital (S3L) output will be locked to 0 if electrodes are not
wet.
• 4-20 mA will be locked to 4 mA if electrodes are not wet.
• Blue and Red LED indicators on the magmeter circuit will
blink alternately if the electrodes are not wet.

Georg Fischer Signet LLC, 3401 Aerojet 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]
3-2551.090-1 Rev. G 10/08 English © Georg Fischer Signet LLC 2008 Printed in U.S.A. on recycled paper
13.0 Ordering Information
3-2551-V0-21 159 001 269
3-2551-V0-22 159 001 275
3-2551-V0-41 159 001 263
3-2551-V0-42 159 001 281
3-2551-V1-21 159 001 270
3-2551-V1-22 159 001 276
3-2551-V1-41 159 001 264
3-2551-V1-42 159 001 282
3-2551-V2-21 159 001 456
3-2551-V2-22 159 001 457
3-2551-V2-41 159 001 462
3-2551-V2-42 159 001 463
3-2551-W0-21 159 001 271
3-2551-W0-22 159 001 277
3-2551-W0-41 159 001 265
3-2551-W0-42 159 001 283
3-2551-W1-21 159 001 272
3-2551-W1-22 159 001 278
3-2551-W1-41 159 001 266
3-2551-W1-42 159 001 284
3-2551-W2-21 159 001 458
3-2551-W2-22 159 001 459
3-2551-W2-41 159 001 464
3-2551-W2-42 159 001 465
3-2551-P0-21 159 001 267
3-2551-P0-22 159 001 273
3-2551-P0-41 159 001 261
3-2551-P0-42 159 001 279
3-2551-P1-21 159 001 268
3-2551-P1-22 159 001 274
3-2551-P1-41 159 001 262
3-2551-P1-42 159 001 280
3-2551-P2-21 159 001 435
3-2551-P2-22 159 001 438
3-2551-P2-41 159 001 432
3-2551-P2-42 159 001 441
3-2551-T0-21 159 001 436
3-2551-T0-22 159 001 439
3-2551-T0-41 159 001 433
3-2551-T0-42 159 001 442
3-2551-T1-21 159 001 437
3-2551-T1-22 159 001 440
3-2551-T1-41 159 001 434
3-2551-T1-42 159 001 443
3-2551-T2-21 159 001 454
3-2551-T2-22 159 001 455
3-2551-T2-41 159 001 460
3-2551-T2-42 159 001 461
Mfr. Part Number Code
Mfr. Part Number Code
Sensor Part No.
3-2551
Sensor Body (Transducer) and electrodes/grounding ring materials - Choose one
-P Polypropylene and 316L SS
-T PVDF and Titanium
-V PVDF and Hastelloy C
-W PVDF and 316L SS
Pipe size - Choose one
0 DN15 to DN100 (1/2 to 4 in.)
1 DN125 to DN200 (5 to 8 in.)
2 DN250 to DN300 (10 to 12 in.)
Display Options - Choose One
-2 With Display, two SPDT relays, one solid state relay
-4 With Display, no relays
Output options - Choose One
1 Open Collector Frequency out or Digital (S3L) out
2 4 to 20 mA output
3-2551 -P 0 -2 2 Example Part Number
Replacement parts
Mfr. Part No. Code Description
1220-0021 198 801 186 O-ring, FPM (Viton®)
1224-0021 198 820 006 O-ring, EPDM
1228-0021 198 820 007 O-ring, FFPM (Kalrez®)
3-8551.521 159 001 378 Clear plastic cap for display
3-8050.396 159 000 617 RC Filter kit (for relay protection)