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‡ SIGNET
2550 InsertionMagmeter
5.5 Display )ptions
The last four main menu functions change the displayed
information. The first two also change the output values.
5.5.1
Operational Outputs
The "Rate Electronic" and "Rate User" functions change both the
display and the output values in the magmeter.
•
RatE selects the standard calibration value based on entered
pipe id as the basis for all outputs.
•
RatU selects the "Cal B" value as the basis for all outputs.
Code entry is not necessary to change the display setting.
RatE is the factory default setting.
Example illustrates changing display setting to RatU.
3.
4.
5.
6.
2.
1.
The display and all outputs
adjust to the new selection
when the enter key is
pressed.
Use the up arrow to move
quickly to the display
options.
ENTER
RUN
EDIT
Step:
Press: To display:
5.5.2
Diagnostic displays
The diagnostic displays are used to evaluate abnormalities in the
process stream.
•
The standard electrical deviation (StdE) is related to the level
of electrical fluctuation in the input signal reference. The
value is displayed in terms of volts, ie "0.02" represents 20
millivolts. Nominal values range from 50 mV at low velocities
to 80 mV at maximum velocity. Higher values indicate
excessive fluid noise levels, or inadequate earth ground.
Use the Sensitivity adjustment (section 5.4.1) to compensate
and check the grounding requirements (section 3.2).
•
The standard flow deviation (StdF) is an overall indication of
the stability of the flow signal. It incorporates the StdE, as
1.
2.
3.
RUN
EDIT
ENTER
well as mechanical factors such as unstable flow profiles,
misaligned sensors, and coated electrodes. StdF is
displayed as a percentage of flow rate, typically from 5 to 8%.
StdF levels in excess of 10% indicate inadequate installation
or application standards.
If StdE value is high, the StdF will always be high.
If StdE is low but StdF is high, look for causes related to sensor
location, such as insufficient upstream straight runs and sensor
alignment. If the StdF cannot be corrected by modifying the
installation, the Response function (section 5.4.2) will help to
smooth the output signals.
Code entry is not necessary to change the display setting.
Example illustrates changing display setting to StdE.
Use the up arrow to move
quickly to the display
options.
RatE is the
factory default setting.
Selecting the StdE or StdF
diagnostic displays will not
affect or interrupt the
outputs.
Step:
Press: To display:
5.6 Frequency Output
The frequency output from the 2550 is an open collector signal
that requires a 5 to 12 VDC reference.
5.6.1
Product Compatibility
The frequency output of the 2550 is compatible with all
+GF+Signet flow instruments.
Black (+V)
5 to 12 VDC in
Red (Signal out)
Shield (Ground)
2550
2K
Ω
TS 2