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2.8
Loop Configuration of 4mA & 20mA Control Points
2.8.1
Manually
PROGRAM INPUT
(White wire)
Loop configuration of 4mA and 20mA control points can
be set either outside the vessel or within the vessel. If the
configuration is set inside the vessel, then actual level position
within the vessel is used to set the 4mA and 20mA positions.
If this is not practical, the probe should be "Bench Configured".
The system requires Intrinsically Safe power, so setting the Zero
and Span points can be done in a hazardous area.
1.) Power-up the probe
2.) Place float at desired 4mA / 20mA position
3.) Unlock the configuration program by momentarily "Shorting"
the White Program Wire (Blue in EU) to the Black Loop "-"
Wire (Based on the security timing sequence in Section
2.8.3)
4.) The 4mA control point is set by momentarily "Shorting" the
White Program Wire (Blue in EU) to the Black Loop "-" Wire
(Based on the security timing sequence in Section 2.8.3)
5.) The 20mA control point is set by momentarily "Shorting"
the White Program Wire (Blue in EU) to the Red Loop "+"
Wire (Brown in EU) (Based on the security timing sequence
in Section 2.8.3)
6.) Loop configuration is complete
LOOP IN (–)
(Black wire)
4
1
3
2
LOOP IN (+)
(Red wire)
Figure 2-16
"M" Probe Connector
CHASSIS
(Sheild for Cable)
ZERO
(Green wire for cord set)
23
Installation
PROGRAMMING
BUTTONS
SPAN
–
+
ZERO
SPAN
Figure 2-17
"H" Housing Option
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