5
2551 Blind Magmeter
Hardware Confi guration
Whether using the 2551-XX-11 (with frequency or Digital
(S
3
L) output) or the 2551-XX-12 (with 4 to 20 mA output), the
wiring terminals located on the inside of the yellow cover are
identical. All of the connections from the Magmeter to external
equipment (PLC, Datalogger, Chart Recorder, Flow meter,
etc.) are made at the large 4-position terminal connector.
When the cover is removed the wiring from the sensor can
be seen connected to the smaller terminal block. These
connections should always remain connected to prevent
inadvertent damage or miswiring.
The terminals on the 2551 Magmeter are designed for
conductors from 16 AWG to 22 AWG.
WARNING!
If the second conduit port is used, carefully drill
the opening. (The plastic is too strong to be
punched out.)
• Secure the Magmeter in a vise to prevent
damage or injury.
• The plastic inside the port is very thin.
Do not allow the drill to penetrate too deeply
and damage the Magmeter wiring.
1
2
3
4
JP2
White
Yellow
Red
Black
Brown
Blue
Not used
The factory connects
the sensor cable to the terminals
inside the yellow cover.
This blue jumper selects
frequency output or
S
3
L serial data output
in the 3-2551-XX-11
(Not used on 2551-XX-12 models)
The user must connect output cables to
this 4-terminal block.
JP2 is for factory use only.
MAKE NO CONNECTIONS.
Set this blue jumper according to the pipe size.
Sensor Type
Pipe Size
Jumper Position
2551-P0/T0/V0
½ in. to 2½ in.
DN15
to
DN65
2551-P0/T0/V0
3 in. to 4 in.
DN80
to
DN100
2551-P1/T1/V1
5 in. to 6 in.
DN125
to
DN150
2551-P1/T1/V1
8
in.
DN200
2551-P2/T2/V2
10 in. to 12 in.
DN250
to
DN300
Sensor grounding ring
3-9000.392-1
Liquid tight connector
(one supplied)
Use the yellow decal
to mark the direction
of flow on the pipe
External Earth Ground Terminal
Flow
Important:
• The directional arrow on the sensor body MUST be pointed DOWNSTREAM for correct
operation. (Digital (S
3
L) and 4 to 20 mA will not work if fl ow is against direction of arrow).
• The FLOW arrow decal can be placed directly on the pipe to identify the direction of fl ow.
• Use a cable gland or a liquid tight connector to seal the cable ports from water intrusion.
• The yellow housing may be reversed to align the conduit ports as required.
• If the Magmeter is installed on a vertical pipe, the conduit ports should be turned to
point downward.
• This will prevent condensation from being channeled into the enclosure.
• Use plumber's tape or a suitable sealant on cable ports.
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.
WARNING!
DO NOT USE thread sealant or
lubricants on the fitting threads.
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 viscous
non-petroleum based lubricant
(grease) compatible with the system.
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 fl uid with possibly
serious consequences, such as damage to equipment and serious personal injury. Retaining nuts that may have been in contact with
such substances, e.g. due to leakage or spilling, must be replaced.