GF Signet 2552 User Manual
Signet 2552 Metal Magmeter
English
*3-2552.090*
3-2552.090 Rev E 07/10 English
SAFETY INSTRUCTIONS
1. Depressurize and vent systems without Hot-tap valve prior to installation or removal.
2. Confi rm chemical compatibility before use.
3. Do not exceed maximum temperature/pressure specifi cations.
4. Wear safety goggles or face shield during installation/service.
5. Do not disassemble or alter product construction.
6. Disconnect power before attempting any service or wiring.
1. Description
The Signet 2552 Metal Magmeter from Georg Fischer features all-stainless steel construction. The PVDF nosepiece and FPM O-rings
are the only other wetted materials. The 2552 installs quickly into standard 1¼ in. or 1½ in. pipe outlets, and is adjustable to fi t pipes
from DN50 to DN2550 (2 to 102 inches). Three sensor lengths allow maximum fl exibility to accommodate a variety of hardware
confi gurations, including ball valves for hot-tap installations.
When equipped with the frequency output, the 2552 is compatible with any Signet fl ow instrument, while the S3L Digital output enables
multi-channel compatibility with the Signet 8900 Multi-Parameter Flow Controller. Select the blind 4 to 20 mA current output to interface
directly with dataloggers, PLCs or telemetry systems.
Key features include Empty Pipe Detection, LED-assisted troubleshooting, and Bi-Directional span capability (in 4 to 20 mA models).
The Signet 3-0250 USB to Digital (S3L) Confi guration/Diagnostic Tool is available to customize every performance feature in the 2552
so it can be adapted to the user's application requirements.
2. Specifi cations
Performance
Pipe size range: DN50 to DN2550 (2 in. to 102 in.)
Flow Range:
• Minimum: 0.05 m/s (0.15 ft/s)
• Maximum: 10 m/s (33 ft/s) for pipes to DN 1200 (48 in.)
3 m/s (10 ft./s) for pipes over DN 1200 (48 in.)
Linearity: ±(1% reading + 0.01 m/s)
±(1% reading + 0.033 ft/s)
Repeatability: ±0.5% of reading @ 25 °C
Accuracy: ±2% of measured value (in reference conditions
where the fl uid is water at ambient temperature, the sensor
is inserted at the correct depth and there is a fully developed
fl ow profi le which is in compliance with ISO 7145-1982 (BS
1042 section 2.2))
Minimum Conductivity: 20 S/cm
Wetted Materials
• 316L Stainless Steel body and electrodes
• PVDF Insulator
• O-rings: FPM (standard)
• Cable: 4-cond + shield, PVC jacket (Fixed cable models) or
Water-resistant rubber cable assembly with Turck
connector
Power Requirements
• 4 to 20 mA: 24 VDC ± 10%, regulated, 22.1 mA maximum
• Frequency: 5 to 24 VDC ± 10%, regulated, 15 mA maximum
• Digital (S
• Reverse polarity and short circuit protected
Cable Options
• Fixed 7.6 m (25 ft) cable
• Detachable water tight sensor cable with Turck
sold separately, two lengths: 4m (13 ft) or 6m (19.5 ft)
Custom lengths available, contact Georg Fischer Signet
3
L): 5 to 6.5 VDC, 15 mA maximum
®
NEMA 6P
®
connector
Electrical
Current Output (4 to 20 mA)
• Programmable and reversible
Factory Range: 4 to 20 mA = 0 to 5 m/s
• 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
auxiliary power
• Maximum cable: 300 m (1000 ft)
• Max. Loop Resistance: 300
• Error condition: 22.1 mA
Frequency output
• Compatible with Signet 5075, 5500, 5600, 8550 and 8900
• Max. Pull-up Voltage: 30 VDC
• Short Circuit Protected: 30 V @ 0 pull-up for one hour
• Reverse Polarity Protected to -40 V for 1 hour
• Overvoltage Protected to +40 V for 1 hour
• Max. Current Sink: 50 mA, current limited
• Maximum cable: 300 m (1000 ft)
Digital (S
• Compatible with Signet 8900
• Serial ASCII, TTL level 9600 bps
• Maximum cable: Application dependent (See 8900 manual)
Standards and Approvals
• CE
• U.S. Patent No.: 7,055,396 BI
• NEMA 4 (IP65) (fi xed cable models)
• NEMA 6P (IP68) (Submersible cable models only)
Signet recommends maximum 3 m. (10 ft) submersion depth
• Manufactured under ISO 9001 and ISO 14001
3
L) Output
for maximum 10 days continuous submersion.
China RoHS (Go to www.gfsignet.com for details)
2.1 Temperature and Pressure Specifi cations
0
A
A
Max. Temperature/Pressure Rating
Storage Temperature:
-15 °C to 70 °C (5 °F to 158 °F) in non-icing conditions
Operating Temperature
• Ambient: -15 °C to 70 °C (5 °F to 158 °F) in non-icing conditions
• Media: -15 °C to 85 °C (5 °F to 185 °F)
Maximum Operating Pressure:
20.7 bar @ 25 °C (300 psi @ 77 °F)
Hot-Tap Installation Requirements
• Maximum Installation Pressure: 20.7 bar (300 psi)
• Maximum Installation Temp.: 40 °C (104 °F)
Do not use hot-tap installation where temperatures will
exceed 40 °C or if hazardous liquids are present.
2552 Magmeter
bar psi
20.6
19.8
18.1
16.4
14.7
12.9
11. 2
9.5
7.8
6.0
Operating Pressure
4.3
2.6
0.9
Temperature-Pressure Operating Range
300
275
250
225
200
175
150
125
100
75
50
25
-10
°C
5
°F
Safe Media Pressure
and
Temperature Range
10
20-20 30405060708090
0
23
41
59 77
95 113 131
Media Temperature
100
158 185 212
2.2 2552 Magmeter Overview
Signal Cable
Sensor Adjustment Hub
lignment Reference hole
CME Threaded
outer housing
Locking
Set Screw
2.3 2552 Magmeter Dimensions
137 mm
5.4 in.
32 mm (1.25 in.)
Acme threads
2552-2 models
276.3 mm
10.88 in.
2552-2 models
290 mm
11.4 in.
2552-3 models
432 mm
17.0 in.
Process Connector Nut
1¼ in. or 1½ in.
NPT or ISO threads
316 SS Sensor Body
316 SS Electrodes
2 2552 Magmeter
Threaded
Ground lug
2552-3 models
419 mm
16.5 in.
41 mm
1.6 in.
3. Selecting a Location
The 2552 requires a fully developed turbulent fl ow profi le for accurate measurement. Selecting the correct location in the piping system
is critical to the performance of the magmeter.
Locate the magmeter where air bubbles will not contact the electrodes.
Placing the sensor in a vertical section of pipe, with fl ow going UPHILL is the fi rst choice for this requirement.
The piping system should be designed to keep the sensor wet at all times.
In applications where the conductivity of the process liquid is less than 100 S, magmeters should be allowed to soak in a full pipe for
24 hours before operation.
3.1 Vertical Installations Recommended
Locating the sensor where the fl ow is upward protects the sensor from exposure to air bubbles and may offset upstream turbulence
caused by pipe conditions and other hardware.
O.K.
+
GF
+
3.2 Horizontal Installations
If the magmeter must be mounted in a horizontal section of pipe, take extra precautions to prevent air bubbles from passing over the
sensor.
O.K.
+
GF
+
GF
+
+
GF
+
+
Select a location with suffi cient distance of straight pipe immediately upstream of the sensor. The dimensions illustrated here are
intended for general guidance. Every piping system has unique characteristics, and requires individual evaluation.
Inlet Outlet
Flange
10 x I.D. 5 x I.D.
2 x 90° Elbow
25 x I.D. 5 x I.D.
+GF+
+GF+
Reducer
15 x I.D. 5 x I.D.
2 x 90° Elbow
3 dimensions
40 x I.D. 5 x I.D.
+GF+
90° Elbow
+GF+
20 x I.D. 5 x I.D.
+GF+
Valve/Pump
50 x I.D.
+GF+
5 x I.D.
O.K.
+GF+
20 x ID
+GF+
Located the magmeter in a "trap" to prevent air bubbles and to
keep the electrodes wetted for best performance.
Air pockets and bubbles will travel at the top of a horizontal pipe,
so avoid vertical installations.
Sediments and debris that collect at the bottom of a horizontal
pipe will interference with the operation.
32552 Magmeter
4. General Installation and Grounding Tips
→
4.1 Sensor conditioning
The Magmeter output signal may be unstable immediately after installation. Allowing the sensor to soak in a full pipe (or in any
container of water) for 24 hours will stabilize the performance.
• Very low conductivity fl uids may require a longer conditioning period.
• The Magmeter may not operate properly in fl uids where the conductivity is less than 20 μS/cm.
4.2 Grounding
The 2552 Magmeter is unaffected by moderate levels of electrical noise, especially if installed in a properly grounded metal piping
system. However, in some applications it may be necessary to ground portions of the system to eliminate electrical interference. The
grounding requirements will vary with each installation.
One or more of the following steps may be applied if the 2552 Magmeter is affected by electrical noise:
c Connect a wire (14 AWG/2.08 mm
2
recommended) from the ground terminal screw on the sensor nut directly to a local Earth
ground.
d Install fl uid grounding devices immediately upstream and downstream of the Magmeter.
Connect the fl uid grounds to the Earth ground terminal on the 2552.
Use fl anged grounding rings or metal electrodes on plastic pipes, or metal clamps on metal pipes.
Fluid grounds must be in direct contact with the fl uid, and as near to the Magmeter as possible.
e Connect the SHIELD conductor to Earth ground near the instrument.
Flow 6.25 GPM
Total 1234567.8>
Signet Flow
Transmitter
8550
Blue
Black
Brown
White
ENTER
Shield
3.
FLOW →
1.
2.
4 in. to 50 in.
(10 cm to 1.3 m)
4 in. to 50 in.
(10 cm to 1.3 m)
2.
Grounding rings on plastic pipe
(Installed between flanges)
4 2552 Magmeter
4.3 Preparing for Installation
The alignment of the electrodes in the pipe and the insertion depth of the electrodes in relation to the inside diameter of the pipe are
critical to the successful operation and calibration of the system. The brass rod that is supplied with the 2552 is used to assist with this
requirement.
4.4 H-Dimension
The H-dimension is the distance from the TOP OF THE PIPE to the BOTTOM OF THE BRASS ROD.
The tables on pages 8–11 include the H-dimension for two of the most common pipe schedules from DN50 to DN2550 (2 in. to 102 in.).
If the pipe is not represented in the tables on pages 8–11, use the procedure below to determine the H-dimension.
The goal of the procedure is to place the Magmeter electrodes 10% inside of the pipe
1. The height from the magmeter electrodes to the alignment rod is:
-2 Versions: 276.3 mm ( 10.88 in. )
-3 Versions: 419.0 mm ( 16.50 in. )
2. Subtract the wall thickness of the pipe:
- Wall Thickness: -_____ mm ( ______ in.)
3. Subtract 10% of the pipe inside diameter:
- 10% of pipe id: -_____ mm ( ______ in.)
4. The result is the H-dimension. Record the result here for reference at the installation site:
= H dimension: =_____ mm ( ______ in.)
Hardware stack height is important
The H-dimension represents the total height
avaliable for the installation hardware.
H Dimension
If there is insuffi cient clearance to accommodate
the hardware, select a longer 2552 Magmeter or
modify the hardware to reduce the stack height.
Hardware
Stack Height
10% of
inside diameter
Wall Thickness
52552 Magmeter
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