GF Signet 2551 Display Manual
English
Signet 2551 Display Magmeter
*3-2551.090-1*
3-2551.090-1
Rev. K 10/12
English
SAFETY INSTRUCTIONS
1. Depressurize and vent system prior to installation or removal.
2. Conrm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure specications.
4. Wear safety goggles or faceshield during installation/service.
5. Do not alter product construction.
1. Description
The 2551 Magmeter measures the ow rate in a full pipe by monitoring the voltage produced when the (conductive) uid moves through
a magnetic eld. Output options include a traditional frequency signal, a serial data (Digital (S3L)) output, and a 4 to 20 mA output.
The 2551 Magmeter is available in three sizes that will accommodate pipes from ½-inch through 36-inch diameters.
Select from three different material combinations to match the Magmeter to the application requirements.
Contents
1. Description
2. Specifications
3. Installation: Pipe fittings
1
2
3
3.1 Installation: Selecting a Location
3
4. Overview of 2551 Display versions
5. Wiring
4
5
5.1
5.2
5.3
5.4
5.5
Basic Wiring
Wiring: Mirror Relay 1 output
2551 and other manufacturer's instruments
Wiring to Signet Flow Instruments
Wiring Relays
6. View Menu
6.1
6.2
6.3
6.4
Resetting the Resetable Totalizer
Navigating the Menus
Keypad Functions
Security Code
5
5
5
6
7
8
8
9
9
9
7. Setup Menu
10
7.1 Averaging and Sensitivity
7.2 Bi-Directional Flow
7.3 Calibration Data
8. Calibration Menu
8.1 Volume method of calibration
8.2 Rate method of calibration
9. Relay Menus
11
12
12
14
14
14
15
9.1 Pulse Relay mode
9.2 Total Relay mode
9.3 High, Low, or Window Relay modes
10. Test Menu
11. Options Menu
15
15
16
17
17
11.1 Output Modes
17
12. Technical Information
18
12.1 Grounding
12.2 Maintenance
12.3 Troubleshooting
18
19
19
13. Ordering Information
20
WARNING!
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.
• LUBRICATE O-RINGS WITH A NON-PETROLEUM BASED,
VISCOUS LUBRICANT (GREASE) COMPATIBLE WITH
THE SYSTEM.
• 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.
Do not use any tools to
tighten the yellow retaining cap.
DO NOT USE thread sealant or
lubricants on retaining cap!
Lubricate O-rings with a
non-petroleum based, viscous
lubricant (grease) compatible
with the system.
DO NOT USE thread sealant
or lubricants on the fitting threads!
2. Specifications
General
• Pipe size range:
• Flow Range
(Bi-directional)
• Linearity:
• Repeatability
• Minimum Conductivity:
DN15 to DN900 (½ to 36 in.)
Minimum: 0.05 ms (0.15 ft/s)
Maximum: 10 ms (33 ft/s)
±1% of reading +0.01 ms (0.033 ft/s)
±0.5% of reading @ 25 °C (77 °F)
20 S/cm
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
• O-rings:
FPM (standard)
EPDM, FFPM (optional)
The user is responsible for determining the chemical
suitability of these materials for a specic application.
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
Output Specifications
Current output (4 to 20 mA)
• Max Loop Resistance: 300 • Loop Accuracy:
32 A max. error (25 °C @ 24 VDC)
• Temp. drift:
± 1 A per °C max.
• Power supply rejection: ± 1 A 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
• Max. Current Sink:
50 mA, current limited
• Maximum cable:
300 m (1000 ft.)
• Reverse Polarity Protected to -40 V
Digital (S3L) Output:
• Serial ASCII, TTL level 9600 bps
• Compatible with Signet 8900 and 9900
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.
2
Environmental Requirements
• Case:
PBT
• Display window: Polyamide
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)
Standards and Approvals
• CE
• UL, CUL (for display versions with relays)
• NEMA 4X / IP65 Enclosure (with cap installed)
China RoHS
For more information go to www.gfsignet.com
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.
Dimensions
95.3 mm
(3.75 in.)
116.8 mm
(4.6 in.)
-X0
-X1
-X2
Pipe Range
1/2 to 4 in. -X0 = 58 mm (2.3 in.)
5 to 8 in. -X1 = 91 mm (3.6 in.)
10 to 36 in. -X2 = 167 mm (6.6 in.)
X = Sensor Body P, T, or V
Operating Temperature/Pressure
(psi) (bar)
180 12.4
170 11.7
160 11.0
150 10.3
140
9.7
130
9.0
120
8.3
110
7.6
100
6.9
90
6.2
80
5.5
70
4.8
60
4.1
50
3.4
40
2.8
30
2.1
20
1.4
10
.7
0
°C -20
°F -4
0
32
20
68
40
104
60
140
80
176
100
212
120
248
2551 Magmeter
3. Installation: Pipe Fittings
Georg Fischer offers a wide selection of installation ttings that control the position of the Magmeter electrodes in relation to the
dimensions of the pipe. You will nd a complete list of order numbers for installation ttings in the Calibration Tables on pages 12-13.
Type
Plastic
tees
Description
Type
• 0.5 to 2 inch versions
• MPVC or CPVC
Description
Iron, Carbon Steel,
316 SS
Threaded tees
• 0.5 to 2 in. versions
• Mounts on threaded pipe ends
• 2 to 4 inch, cut 1-7/16 inch hole in pipe
• Over 4 inch, cut 2-1/8 inch hole in pipe
PVC
Glue-on
Saddles
• Available in 10 and 12 inch sizes only
• Cut 2-1/2 inch hole in pipe
• Weld in place using solvent cement
Carbon steel &
stainless steel
Weld-on
Weldolets
PVC
Clamp-on
Saddles
• 2 to 4 inch, cut 1-7/16 inch hole in pipe
• 6 to 8 inch, cut 2-1/8 inch hole in pipe
Fiberglass
tees
• 1.5 in. to 2 in. PVDF insert
FPT
Iron
Strap-on
saddles
• 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.
Union Fittings and
Wafers
• For pipes from DN 15 to 50 mm
• PP or PVDF
3.1 Installation: Selecting a Location
• The 2551 requires a full pipe and a fully developed turbulent ow prole 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 uid conductivity and cause
anomalies in the magmeter measurement.
To avoid this problem, install the magmeter UPSTREAM of the injection point.
Flow 6.25 GPM
Total 1234567.8>
ENTER
Flow 6.25 GPM
Total 1234567.8>
Signet Flow
Transmitter
Flow
ENTER
Reducer
90° Elbow
15 x I.D.
Select a location with sufcient distance
of straight pipe immediately upstream of
the sensor.
Signet Flow
Transmitter
Flow
5 x I.D.
20 x I.D.
5 x I.D.
2 x 90° Elbow
3 dimensions
Pump/Valve
2 x 90° Elbow
25 x I.D.
5 x I.D.
OK
5 x I.D.
OK
50 x I.D.
5 x I.D.
OK
+
+GF
+GF+
Locating the sensor in a trap or where
the ow is upward helps to protect the
sensor from exposure to air bubbles
when the system is in operation.
40 x I.D.
+GF+
Vertical flow is OK if the pipe remains full at all times.
+GF+
+GF+
These congurations are not
recommended because it is
difcult to keep the pipe full.
In a gravity-ow 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.
2551 Magmeter
3
4. 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, Digital (S3L), 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 identied as forward ow.
• An adhesive decal is also provided that can be afxed to the pipe to indicate the direction of forward ow.
• Flow in the opposite direction from the arrow will be identied as reverse ow 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.
Language
English
>
6. The part number, serial number and output type are identied on the electronics module.
5.
Relay 1
NC1
RELAY 2
C1
>
Relay 2
NO2
NC2
C2
NO3
Signet Magmeter
Relay 3
420 GPM
123456.78
NC3
C3
ENTER
V+
Aux Pwr
RELAY 1
4.
NO1
V-
2.
Relay output
Aux power
output
1. 4 to 20 mA
3
Digital (S L) output
Frequency output
Mirror relay 1 output
4.
4
2
1
3.
s/n 60504201234
60504201234
p/n 3-2551-11
3-2551-11
4-20/freq out
3
6.
Chemical Compatibility Warning
The retaining nuts of Magmeters 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 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.
4
2551 Magmeter
5. Wiring
5.1 Basic Wiring
Frequency output
3-2551-21 and -41 Magmeters may be programmed in the
OPTIONS menu 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.
4 to 20 mA output
The 3-2551-22 and -42 Magmeters provide a passive 4 to 20 mA
loop output.
• External loop power (24 VDC) is required.
• Factory standard calibration is 4 - 20 mA = 0 - 5 m/s.
• The 4 to 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.
Relay 1
C1
C2
C2
Relay 3
4
3
Signal
- VDC
2
Frequency Out
Frequency ÷ 10 Out
(5 to 26.4 VDC)
**********************
3
Digital (S L) Out
(4.5 to 6.5 VDC)
1
+ VDC
V+
V-
4
20
3
4-20 mA Loop Output
5.3 2551 and other manufacturer's instruments
When using the 2551 in a system with other manufacturer's
equipment, a 10 K pull-up resistor (not supplied) may be
required to power the open collector output.
NC3
C3
V+
V-
Not used
3
Non-Signet
Flow Instrument
Ground
Open Collector Out
2
Frequency Input
Sensr Gnd
(SHIELD)
4
Sensr IN
(RED)
3
5-24 VDC Out
1
Relay 3
2551 Magmeter
Aux Pwr
Auxiliary Power for:
Display backlighting
Relay Coils
Ground
+ VDC
2551 Magmeter
NO3
4
2
1
2551 Magmeter
5.2 Wiring: Mirror Relay 1 output
The 3-2551-21 and -41 Magmeter can be congured in the
OPTIONS menu to provide an Open Collector output in lieu of
the sensor signal provided by Frequency or Digital (S3L) output
selections. The Open Collector output can be programmed via the
Relay 1 menu.
- VDC
24 VDC
4
Ground
21.6 to
26.4 VDC
V-
Auxiliary Power for:
Display backlighting
Relay Coils
4.5-26.4
VDC
V+
Aux Pwr
NC3
C3
Aux Pwr
NC3
C3
Relay 3
NO3
NO3
Auxiliary Power for:
Display backlighting
Relay Coils
C1
NO2
NC2
Relay 2
NO2
NC2
NC1
Relay 2
NC1
Relay 1
NO1
NO1
5-24 VDC
Ground
Ground
2
Frequency Out
1
5-24 VDC
10 KΩ
Pull-up Resistor
2551 Magmeter
2551 Magmeter
5
5.4 Wiring to Signet Flow Instruments
The 2551-21 and -41 Magmeter can be congured in the OPTIONS menu to provide a Frequency or Digital (S3L) output.
Frequency output can be used by Signet 5600 Flow Transmitter, and by Signet 8900 Multi-Parameter Controller and 9900 Transmitter.
The Digital (S3L) output can be used by the 8900 and 9900.
2551 Frequency Out to Signet 5600
Relay 1
NO1
NC1
C1
Relay 2
NO2
NC2
C2
Relay 3
NO3
NC3
C3
Aux Pwr
Auxiliary Power for: V+
Display backlighting
VRelay Coils
24 VDC
4
Signet 5600
3
12-24 V
10 W
Ground
2
Frequency Out
1
5-24 VDC
Iso. Gnd
Freq. IN
Sen. Pwr.
Freq. IN
+
Ground
+
Gnd
PLS
output
+
Gnd
AUX
output
1
2
Total
reset
+
-
2551 Magmeter
4-20
mA
Std. Sensor
Open Collector
Sensor
12-24 V
10 W
2551 Frequency Out to 8900 Controller:
3-8900.621C
I/O Module 3-8900.401-X
Frequency
Input
1
Frequency
Input 2
OR
S3L
Input
2
S3L
Input
1
+5VDC (Black)
Freq. Input (Red)
GND (Shield)
+5VDC (Black)
Freq. Input 2 (Red)
S3 L (Red)
GND (White/Shield)
+5VDC (Black)
S3 L (Red)
GND (White/Shield)
2551 Digital (S3L) Out to 8900 Controller:
4
Not used
4
Not used
3
Ground
3
Ground
2
Data
2
Data
1
+5 VDC
1
1
+5 VDC
2
2551 Magmeter
3
4
5
6
7
8
9
3-8900.621C
I/O Module 3-8900.401-X
+5VDC (Black)
Frequency
Input
Freq. Input (Red)
1
GND (Shield)
+5VDC (Black)
Frequency
Input 2
Freq. Input 2 (Red)
OR
S3L
S3 L (Red)
Input
2
GND (White/Shield)
+5VDC (Black)
S3L
Input
S3 L (Red)
1
GND (White/Shield)
10
1
2
3
2551 Magmeter
4
5
6
7
8
9
10
11
11
2551 Frequency or Digital (S3L) Out to 9900 Transmitter:
9900 Transmitter
SHLD
GND
DATA
V+
2551 Magmeter
4
3
Not used
Ground
Frequency or S3L
2
1
6
+5 VDC
2551 Magmeter
NC1
When used to switch inductive loads, dry contact relays may be damaged by
arcing. Signet recommends the installation of a lter device to prevent such
damage.
NO2
3-8050.396
159 000 617
RC Filter kit (for relay use)
C1
NC2
C2
NO3
Relay 3 Type:
Solid State
Rating: 50 mA @ 30 VDC, 50 mA @ 42 VAC
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.
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 sufcient current rating.
NC3
C3
V+
V-
Relay 2
Relays 1 and 2 are dry contact relays rated for 5 A maximum current.
They are best suited for switching high voltage loads, such as AC powered
pumps and valves.
Mechanical Relays:
5A @ 250 VAC
5A @ 30 VDC
Relay 3
NO1
Solid State Relay 3:
50 mA max @ 30 VDC
50 mA max @ 42 VAC
Aux Pwr
Relay 1, Relay 2 Type:
Mechanical SPDT
Rating: 5A @ 30 VDC max., 5 A @ 250 VAC max
Relay 1
5.5 Wiring Relays
Auxiliary Power
9 to 24 VDC
0.4 A Maximum
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 an RC-style lter (“snubber”), installed as illustrated here.
• The lter 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.
Definition:
An inductive load is an electrical device generally made
of wire that is coiled to create a magnetic eld 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.
3-8050.396
AC-powered:
Pumps
Alarm lamps
Audio alarms
Mixers
NO1
NC1
120-240 VAC
C1
NO2
NC2
C2
NO3
NC3
C3
V+
V-
2551 Magmeter
7
6. 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 Resettable 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 ashing character or text on the display indicates that the item is being edited.
This manual uses a (red) star to illustrate a ashing display.
• The following information is viewed by scrolling or . These displays will remain in
the display for 10 minutes, then the normal operating display will return.
RELAY 1
RELAY 2
1234.56 GPM
876543.21 >
Signet Magmeter
ENTER
Show the permanent total. This totalizer cannot be reset.
Shows the current output. For 4 to 20 mA Output models only.
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.
Gallons
Perm 876543.21
Current Output
14.89 mA
Relay
1
Off
2
Off
3
Off
Web Site
www.gfsignet.com
Enter Menu
>
6.1 Resetting the Resettable Totalizer
1234.56 GPM
876543.21 >
RELAY 1
RELAY 2
1234.56 GPM
876543.21 >
Signet Magmeter
ENTER
8
1.
From the normal operating display, press the key.
Enter Code
0000
2.
Reset Total ?
Yes
No
3.
The resettable totalizer can be congured to require
the security code before allowing the reset. If the
Total Reset is set to "RESET OFF" this display will not
appear. See section 11, Options Menu for instructions.
Press any arrow key to toggle the ashing selection
from NO to YES.
123456.78 GPM
000000.00 >
4.
Press the ENTER key. The totalizer will reset to all
zeroes and the display will immediately return to the
normal operating display.
2551 Magmeter
6.2 Navigating the Menus
Normal Operation Display
The normal operating display shows the Flow Rate on the top line and the Resettable Totalizer on
the bottom line.
• All menu instructions in this manual assume that the instrument is showing this display.
RELAY 1
RELAY 2
1234.56 GPM
876543.21 >
Signet Magmeter
ENTER
2551 Menu Directory
The 2551 Magmeter uses seven main menus to provide access to the calibration and programming
features. Each menu serves a specic function.
Starting from the normal operating display, there are two ways to access the menus:
1. Press the key to scroll to the Enter Menu display, then press the key.
2. Press the ENTER key and hold it for about three seconds.
ENTER
Enter Menu
>
Or
3s
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 ow cutoff, and several display characteristics. See section 7.0
for details related to this menu.
Enter Menu
Setup
>
Calibration Menu
This menu provides two different methods for adjusting the calibration. See section 8.0 for details
related to this menu.
Enter Menu
Calibration
>
Enter Menu
Relay 1
>
Enter Menu
Relay 2
>
Enter Menu
Relay 3
>
Test Menu
This menu is used to manually toggle relays or to induce a known value out of the 4 to 20 mA terminals.
See section 10.0 for details related to this menu.
Enter Menu
Test
>
Options Menu
This menu contains those settings and values that are usually programmed during the initial
installation, and then seldom modied, including the SECURITY CODE (see section 6.4). See section
11.0 for details related to the Options menu.
Enter Menu
Options
>
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 Relays 2 and 3
are suppressed in models without relays. See section 9.0 for details related to this menu.
6.3 Keypad Functions
Scrolls UP through any menu.
If the display shows any ashing character or selection,
scrolls UP to the previous value or selection.
Scrolls DOWN through any menu.
If the display shows any ashing character or selection,
scrolls DOWN to the next value or selection.
Press the and keys together to abandon any
unsaved edits and return to the previous display.
Opens the menu currently being displayed.
In Edit modes, advances the ashing character.
In menus with only two options (Yes or No, On or Off)
toggles between selections.
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
Security Code ______ ______ ______ ______
Saves a new selection in any menu.
ENTER From Normal Operation display, jumps to rst selection
in Menu directory (when held for three seconds)
2551 Magmeter
WRITE IT DOWN!
9
7. Setup Menu
The Setup menu contains all of the parameters necessary for the 2551 Magmeter to begin
measuring ow.
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.
RELAY 1
RELAY 2
Enter Menu
Setup
>
Signet Magmeter
Enter Code
0000
ENTER
Use the keypad to navigate through each setting.
ENTER
The values shown for each menu item represent the factory
standard setting. All 2551 magmeters are packaged with these
settings.
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.
K-Factor
060.000
Pipe Size
2” DN50
>
>
Flow Units: Set the units for the application. Four characters are available. The rst 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)
(micro)
_ (blank)
- (dash)
/ (slash)
3 (for cubic units)
Flow Units
GPM
>
The last character selects the timebase for the ow rate measurement.
Select S/s (seconds) M/m (minutes), H/h (hours) or D/d (days)
Set 4 mA: (2551-22 and -42 versions only) Set the ow rate where the current output will be 4 mA.
Set 4 mA
-100 GPM
>
Set 20 mA: (2551-22 and -42 versions only) Set the ow rate where the current output will be 20 mA.
The 4 to 20 mA output may be spanned to monitor forward and reverse ow rates.
Set 20 mA
100.00 GPM
>
Total Factor
1000.0
>
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.
Totalizer Units
Gallons
>
Low Flow Cutoff: Set a ow rate that the 2551 Magmeter will use as a minimum threshhold.
If the ow rate falls below this value, the 2551 will respond as if the ow were zero.
Low Flow Cutoff
0.5 GPM
>
Averaging: Set the averaging period based on the installation and ow conditions. Smaller
values allow the 2551 to respond to changes in ow rate quickly, while larger values smooth the
uctuations caused by installation and ow conditions. See section 7.1 for details.
Averaging
25 secs
>
Sensitivity: Set a percentage of maximum range by which the ow must change to override the
averaging feature and "jump" quickly to the new ow rate. See detailed explanation in section 7.1.
Sensitivity
100%
>
Total Factor: Set the factor by which the totalizer will count. This setting is made in the
application units (i.e., gallons, liters, etc.)
10
2551 Magmeter
7.1 Averaging and Sensitivity
Even the most carefully engineered ow systems may experience
erratic and unstable conditions. If the instability is communicated
to the output functions, the results may create problems for
control devices.
No Averaging
With AVERAGING set to zero, the ow rate will be displayed
immediately and with no ltering. This line represents the
actual output of the ow sensor as it responds to unstable ow
conditions in the pipe.
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 specic application.
• The AVERAGING setting dictates the time over which the
magmeter will average the ow signal.
Velocity
Averaging
The LCD display is updated every second. With averaging at
14 seconds, the ow 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 ow rate.
Higher averaging times help to smooth the display and current
output where the ow in the pipe is erratic or unstable due to
installation limitations.
• The SENSITIVITY setting determines how the 2551 responds
to sudden surges in the ow rate. It "overrides" the Averaging
function just long enough to allow an actual change in ow rate
to be displayed, then resumes the averaging. The result is a
smooth ow display and a quick response to large shifts in the
ow rate.
The settings for Sensitivity represent a percentage of the
magmeter's maximum range, or 10 milliseconds (ms).
Example: A sensitivity setting of 25% means that the ow rate
must change instantly and by more than 2.5 ms before the
function is enabled.
10 s
20 s
30 s
40 s
50 s
60 s
70 s
Averaging Only
With AVERAGING set to 50 seconds and SENSITIVITY still set to
zero the ow rate is stabilized, but a sharp change in ow rate is
not represented on the display or at the output for 50 seconds or
longer.
Velocity
Sensitivity
Time
NOTE: The SENSITIVITY function is ineffective if the AVERAGING
function is set to zero.
Time
10 s
30 s
40 s
50 s
60 s
70 s
Averaging and Sensitivity
With AVERAGING at 50 seconds and SENSITIVITY set to
25%, the ow rate is stabilized, while the sudden shift in ow is
reected very quickly.
Velocity
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.
20 s
Time
2551 Magmeter
10 s
20 s
30 s
40 s
50 s
60 s
70 s
11
7.2 Bi-Directional Flow
• The 2551 magmeter is designed to measure bi-directional ow.
• The forward ow 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 ow.
"-123.45 GPM" during reverse ow.
Totalizer Display:
The totalizer will count during forward ow conditions only.
During reverse ow the totalizer will not increment.
Relay Outputs:
May be set to detect reverse ow: "Low Setpoint at -25 GPM."
4 to 20 mA output:
May be scaled to span any ow range:
For example: "4 to 20 mA = -100 GPM to +100 GPM"
Flow
Frequency output, Frequency ÷ 10 output: Reverse ow is processed same as forward ow in the frequency output magmeters.
Digital (S3L) output:
Reverse ow results in 0 ow rate output.
7.3 Calibration Data: K-Factors
Polypropylene True Union Tees and Wafers
PVDF True Union Tees
PVC True Union Tees
PVC Tees and Clamp-on Saddles
Pipe Size
(In.)
Fitting
Type
K-Factor
Gallons
SCH 80 PVC-U TEES FOR SCH 80 PIPE
½
MPV8T005
2277.0
¾
MPV8T007
1407.6
1
MPV8T010
861.17
1¼
MPV8T012
464.91
1½
MPV8T015
331.43
2
MPV8T020
192.89
SCH 80 PVC TEES FOR SCH 80 PIPE
2½
PV8T025
131.46
3
PV8T030
82.52
4
PV8T040
44.78
SCH 80 CPVC TEES FOR SCH 80 PIPE
½
MCPV8T005
2277.0
¾
MCPV8T007
1407.6
1
MCPV8T010
861.17
1¼
MCPV8T012
464.91
1½
MCPV8T015
331.43
2
MCPV8T020
192.89
K-Factor
Liters
601.58
371.90
227.52
122.83
87.56
50.96
34.73
21.80
11.83
601.58
371.90
227.52
122.83
87.56
50.96
SCH 80 PVC CLAMP-ON SADDLES FOR SCH 80 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
Pipe Size
(Metric)
Fitting
Type
K-Factor
Gallons
K-Factor
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
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
SCH 80 PVC CLAMP-ON SADDLES FOR SCH 40 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
12
2551 Magmeter
7.3 Calibration Data: K-Factors
Carbon Steel Tees and Weld-o-Lets
Stainless Steel Tees and Weld-o-Lets
Galvanized Iron Tees
Pipe Size
(In.)
Fitting
Type
K-Factor
Gallons
Bronze and Copper Tees and Brazolets
Pipe Size
(In.)
K-Factor
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
Fitting
Type
K-Factor
Gallons
BRONZE TEES ON SCH 40 PIPE
1
BR4T010
582.34
1¼
BR4T012
330.54
1½
BR4T015
254.76
2
BR4T020
157.36
K-Factor
Liters
153.86
87.33
67.31
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
Iron Saddles
Pipe Size
(In.)
Fitting
Type
K-Factor
Gallons
K-Factor
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
2551 Magmeter
13
8. Calibration Menu
The K-Factors published in this manual assume that the ow conditions in the pipe are ideal.
RELAY 1
Many factors that affect the ow rate are beyond the control of the magmeter; variations in actual pipe
dimensions, pipe smoothness, and other ow 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.
RELAY 2
1234.56 GPM
876543.21 >
Signet Magmeter
ENTER
Select one of the calibration methods in this menu to achieve the most accurate measurement
possible in a specic application.
ENTER
Enter Menu
NOTE: The Security Code must be entered
before selecting the calibration method.
Enter Code
0000
>
Or
3s
Enter Menu
Setup
>
Enter Menu
Calibration
>
8.1 Volume Method of Calibration
Use the volume method of calibration if the uid 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 ow rates.
When performed properly, volumetric calibration is the most accurate method. For best results a ve minute test period is
recommended, and the test period should be no less than two minutes.
Press Enter
To Start
At START, the 2551 begins counting the ow past the sensor.
Press Enter
To Stop
At STOP, the 2551 stores the total ow accumulated since the START.
Enter Volume
000000. GPM
Enter the VOLUME that has been pumped past the sensor.
Value must be
more than 0.0
This error message appears if volume entered or the accumulated ow is zero. Repeat the test
after checking the system.
K-Factor
Out of Range
This message appears if the new K-Factor is less than 0.0001 or greater than 999999.
To correct the problem, perform the volumetric ow again, and be certain that the volume entered
is accurate.
K-Factor
45.6789
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.
8.2 Rate Method of Calibration
Use this method if the 2551 Magmeter must be calibrated to match a reference ow 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.
Set New Flowrate
45.6789
K-Factor
Out of Range
K-Factor
56.7890
14
The ow rate shown is based on the existing calibration of the 2551. Use the keypad to modify the
ow rate to match the reference meter. The 2551 will automatically calculate a new K-Factor based on
the new ow rate.
This message appears if the new K-Factor is less than 0.0001 or greater than 999999.
To correct the problem, reexamine the ow rate and make certain it is accurate.
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.
2551 Magmeter
9. Relay Menus
Magmeter models 3-2551-21 and -22 have two dry contact relays (Relays 1 and 2) and one Solid
State relay (Relay 3).
RELAY 1
RELAY 2
1234.56 GPM
876543.21 >
Any of these relays can be set to any of the operating modes listed below.
Signet Magmeter
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 ow rate falls below -10 GPM.
ENTER
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.
ENTER
Enter Menu
>
NOTE: The Security Code must be entered
before modifying the relay menu.
Enter Code
0000
Or
3s
Enter Menu
Setup
>
Enter Menu
Calibration
>
Enter Menu
Relay 1
>
9.1 Pulse Relay mode
Program a relay to activate for a xed period, for each volume of uid 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 Volume
0.0000 Gal
>
Relay 1 Width
0.1 secs
>
Relay Volume: Set the volume of uid 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.
9.2 Total Relay mode
Program a relay to activate when the Resetable totalizer reaches a specic value. The maximum setting is 999999.
Application example: A lter must be replaced in an R.O. system every 10000 gallons. The service representative that installs a new
lter sets relay 3 to Total mode, sets the setpoint at 10000 and resets the totalizer to 000000.00. Every time the Totalizer reaches
10000, the relay activates and lights a message indicator to remind the service representative to replace the lter.
When the totalizer is reset, the relay will be deactivated and the process begins anew.
Relay 1 Mode
Total
2551 Magmeter
>
Relay 1 Set High
000000
>
15
9.3 High, Low, or Window Relay modes
Program the relay to activate when the ow rate reaches a setpoint (High or Low) or when the ow
rate moves outside of a prescribed range (Window).
RELAY 1
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 ow rate falls to -10 GPM.
RELAY 2
1234.56 GPM
876543.21 >
Signet Magmeter
ENTER
Process
ENTER
Hysteresis
Enter Menu
Relay behavior with LOW Setpoint
Or
>
Low Setpoint
Time
3s
Enter Menu
Setup
>
Enter Menu
Calibration
>
Enter Menu
Relay 1
>
Process
High Setpoint
Relay behavior with HIGH Setpoint
Hysteresis
Time
NOTE: The Security Code
must be entered before
modifying the relay menu.
Process
High Limit
Hysteresis
Window
Enter Code
0000
Relay behavior with WINDOW Setpoints
Hysteresis
Low Limit
Time
Relay activated
Relay deactivated
Set Low: Set the ow rate where a Low relay will be activated.
The values shown for each menu item represent the factory standard
setting. All 2551 magmeters are packaged with these settings.
Relay 1 Mode
Low
>
Hysteresis: Set a ow rate increment where the relay will be
deactivated. The hysteresis setting serves to prevent relay
"chatter" when the ow rate recovers from an alarm condition by
requiring the low rate to move substantially within the setpoint.
Set High: Set the ow rate where a High relay will be activated.
Relay 1 Mode
High
>
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 ow rate time to move back within the setpoint.
Relay 1 Mode
Window
>
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 Set Low
00.000 GPM
>
Relay 1 Set High
00.000 GPM
>
Relay 1 Hys
00.000 GPM
>
Relay 1 Delay
0.1 secs
>
The menu repeats for Relay 2 and Relay 3.
16
2551 Magmeter
10. 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
RELAY 1
Test Output
4.20 mA
>
Shown for 4 to 20 mA models only (3-2551-XX-22, -42).
Use the keypad to enter any current output from 4.0 mA minimum
to 22.1 mA maximum.
Test Relay 1
Open
Closed
>
Shown for Relay models Only
Toggle any of these relays ON and OFF to verify that the system
is operating properly.
Test Relay 2
Open
Closed
>
RELAY 2
Enter Menu
Test
>
Signet Magmeter
ENTER
Test Relay 3
Open
Closed
>
Auxiliary power MUST be
connected to the 2551 to test
the relays.
V+
V–
Auxiliary Power
9 to 24 VDC
0.4 A Maximum
11. 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.
RELAY 1
Select from English, French, German, Italian, Portuguese or
Spanish. This selection will be displayed at rst power-up of a new
magmeter.
Language
English
>
Security Code
****
>
Security Code can be set to any four digit number. Factory standard
setting is 0000.
Contrast
2
>
Set for best view after the magmeter is installed. Larger number
means display appears darker.
Total Reset
Lock On
>
Lock ON requires the Security Code before resetting the
Resetable Totalizer. Lock OFF reset with no security code.
Noise Rejection
60 Hz
>
RELAY 2
Enter Menu
Options
>
Signet Magmeter
ENTER
The values shown for each
menu item represent the
factory standard setting.
All 2551 magmeters are
packaged with these settings.
Flow Decimal
****.**
>
Total Decimal
******.**
>
Separator
ddd.d
>
Output Mode
Frequency
>
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 autoscale 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 ow sensor and provides an output pulse that is compatible with all
Signet POWERED ow 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 or 9900 Transmitter.
2551 Magmeter
17
12. 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 PTFE 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.
c
The 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:
d
Connect 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 uid.
If the interference persists, apply step #3:
e
The 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:
f
Connect an additional wire (minimum AWG 14/1.5 mm2) from the remote instrument ground to the magmeter ground terminal.
Do not terminate
shield at Magmeter
3.
1.
Instrument
4.
Sensor
Grounding ring
4 in. to 50 in.
(10 cm to 1.3 m)
2.
4 in. to 50 in.
(10 cm to 1.3 m)
Grounding rings on plastic pipe
(Install between flanges)
or
metal straps on metal pipe
2.
12.2 Maintenance
The 2551 Magmeter requires very little maintenance. There are no user-serviceable components in the magmeter.
• If the uid 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.
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.
18
2551 Magmeter
12.3 Troubleshooting
Symptom
Possible Cause
Solution
Magmeter installed too close to upstream
obstruction.
Relocate the magmeter to have straight
uninterrupted pipe upstream of the sensor
for at least 10 x the pipe diameter.
Magmeter located in area exposed to air
bubbles/pockets.
Eliminate air bubbles in the pipe.
Magmeter is installed in pipe backwards.
Remove the magmeter and reinstall with
the ow direction arrow on the sensor body
pointed DOWNSTREAM.
Electrical noise is interfering with the
measurement.
Review the grounding of the magmeter and
the pipe. Install adequate Earth ground to
allow the Magmeter to operate properly.
Electrodes are coated with deposits or
chemical oxide layers.
Carefully clean the electrodes. Refer to
sensor manual for details.
Electrodes not adequately conditioned in
uid.
Allow the sensor to sit in full pipe for
24 hours then restart.
Fluid is moving inside the pipe.
Increase the Low Flow Cutoff. (section 7.0)
No 4 to 20 mA output.
Loop power not connected correctly.
Connect 24 VDC ±10% connected to loop
terminals 1 and 3.
4 to 20 mA current output is incorrect.
4-20 mA is not scaled properly.
Check and reset in the Setup Menu.
2551 is wrong model.
Frequency/S3L model:
3-2551-21 (w/rlys) or -41 (w/o rlys).
Incorrect setting in Options Menu.
Select Frequency in the Options menu.
Wiring is not correct.
Check wiring, make corrections.
Frequency input to other manufacturer's
ow instrument does not have pull-up
resistor.
Install 10 k resistor. (section 5.1)
The uid is too clean for Magmeter.
Unsuitable application for Magmeter.
Output is erratic and unstable.
Output is not 0 when ow is stopped.
No Frequency output.
No S3L output.
No ow rate, current output is 22 mA.
Electronic component failure.
Return 2551 to factory.
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 specication.
Correct the main power deciency.
Troubleshooting with the RED and BLUE LEDs
4
3
No Lights: The power is off or the sensor is not connected
Solid Blue: The power is on but there is no ow in the pipe.
Blinking Blue: Normal operation, blink rate is proportional to the ow 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)
2
1
D7
D6
Flow
Flow
Reverse flow:
• Frequency out cannot distinguish reverse ow from forward ow. The output will be the absolute value.
• Digital (S3L) output: Reverse ow results in 0 ow rate displayed on 8900, or with negative numbers on the 9900.
• 4 to 20 mA output can be spanned into negative ow 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.
2551 Magmeter
19
13. Ordering Information
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
3-2551 -P
PVDF and Hastelloy-C
Pipe size - Choose one
0 DN15 to DN100 (1/2 to 4 in.)
1 DN125 to DN200 (5 to 8 in.)
2 DN250 to DN900 (10 to 36 in.)
Display Options - Choose One
-2 With Display, two SPDT relays, one solid state relay
0
-4
With Display, no relays
-2
Output options - Choose One
1 Open Collector Frequency out or Digital (S3L) out
2 4 to 20 mA output
2 Example Part Number
Mfr. Part Number
Code
Mfr. Part Number
Code
3-2551-P0-21
3-2551-P0-22
3-2551-P0-41
3-2551-P0-42
159 001 267
159 001 273
159 001 261
159 001 279
3-2551-T2-21
3-2551-T2-22
3-2551-T2-41
3-2551-T2-42
159 001 454
159 001 455
159 001 460
159 001 461
3-2551-P1-21
3-2551-P1-22
3-2551-P1-41
3-2551-P1-42
159 001 268
159 001 274
159 001 262
159 001 280
3-2551-V0-21
3-2551-V0-22
3-2551-V0-41
3-2551-V0-42
159 001 269
159 001 275
159 001 263
159 001 281
3-2551-P2-21
3-2551-P2-22
3-2551-P2-41
3-2551-P2-42
159 001 435
159 001 438
159 001 432
159 001 441
3-2551-V1-21
3-2551-V1-22
3-2551-V1-41
3-2551-V1-42
159 001 270
159 001 276
159 001 264
159 001 282
3-2551-T0-21
3-2551-T0-22
3-2551-T0-41
3-2551-T0-42
159 001 436
159 001 439
159 001 433
159 001 442
3-2551-V2-21
3-2551-V2-22
3-2551-V2-41
3-2551-V2-42
159 001 456
159 001 457
159 001 462
159 001 463
3-2551-T1-21
3-2551-T1-22
3-2551-T1-41
3-2551-T1-42
159 001 437
159 001 440
159 001 434
159 001 443
Replacement Parts and Accessories
Mfr. Part No.
1220-0021
1224-0021
1228-0021
3-8050.390-1
3-8050.390-3
3-8050.390-4
3-8050.391
3-8050.396
3-8551.521
Code
198 801 186
198 820 006
198 820 007
159 001 702
159 310 116
159 310 117
159 001 703
159 000 617
159 001 378
Description
O-ring, FPM
O-ring, EPDM
O-ring, FFPM
Retaining Nut Replacement Kit, NPT, Valox®
Retaining Nut Replacement Kit, NPT, PP
Retaining Nut Replacement Kit, NPT, PVDF
Retaining Nut Replacement Kit, NPT, Stainless Steel
RC Filter kit (for relay protection)
Clear plastic cap for display
Georg Fischer Signet LLC, 3401 Aero Jet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. (626) 571-2770 • Fax (626) 573-2057
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): (800) 854-4090
For the most up-to-date information, please refer to our website at www.gfsignet.com
3-2551.090-1 Rev. K 10/12 English
© Georg Fischer Signet LLC 2012
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