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‡ SIGNET
2550 InsertionMagmeter
4.1 Grounding Requirements
The 2550, like all magnetic flow sensors, is sensitive to electrical
noise which is present in most piping systems. The grounding
procedure illustrated below is necessary in all installations to
insure proper performance.
Connect a local earth ground to the TS5 terminal strip as
illustrated (EG1). If the cable from power source to the 2550 is
less than 200 ft./61m, EG2 is an acceptable alternative. Using
both EG1 and EG2 is always the best system.
4.2 Installation tips
1.
Make sure the Filter function is set to the proper value for
your AC power source (50 or 60 Hz). (See section 5.4.4.)
2.
Allow the magmeter to operate for a period before
attempting to calibrate the unit. The electronics require a
"settling" period during which the electrode may generate
unstable signals. Thirty minutes to one hour is sufficient.
Local
Earth Ground #1
(EG1)
24 VDC 1A
Power Supply
-
+
2550
AC+
ACN
Earth Ground #2 (EG2)
110
VAC
1
2
1
2
1
2
3
4
1
2
1
2
3
4
4-20 TS3
R+
R-
TS4
B
A
TS2
RS485
BLK
RED
SHLD
SHLD
-
+
24V
TS1
TS5
Process Pipe
Cable gland
tightened
Cable gland
not tightened
With moisture
drip loop
Without moisture
drip loop
Careful cable routing and sealed ports can help
prevent water intrusion.
3.
In plastic piping systems, the fluid carries significant levels
of static electricity that must be grounded for best magmeter
performance.
Since plastic pipe is not grounded as metal pipes are, extra
steps must be taken. Identify the places where the fluid is in
electrical contact with external metal structures or grounds.
Connect these points to TS5 wherever practical.
4.
Connect the 24 VDC power and the analog output signal
cables through separate cable ports. If the frequency output
is being used, install a watertight cable connector in one of
the unused ports. Do not run two cables through one port.
Doing so will defeat the watertight integrity of the port.
5.
Operation
5.1 Control panel description
During EDIT mode, all the output functions of the 2550
are still active, so the control process is uninterrupted.
4 digit liquid crystal display:
"-- -- -- -- --" indicates reverse flow. All signal outputs are disabled.
RUN
EDIT
ENTER
FLOW
•
The
RUN
EDIT
key switches the display from normal operation
(RUN) to EDIT, where the calibration parameters can be
modified.
•
The
and
keys scroll through the menu selections
and edit options.
•
The
ENTER
key serves two functions.
1.
Selects a particular item from main menu.
2.
Stores a new value in calibration functions.
