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