Replacement And Calibration Of Electronic Cassettes; Replacement Sequence - Emerson Rosemount 2130 Reference Manual

Reference Manual
00809-0100-4130, Rev DC
3.8

Replacement and calibration of electronic cassettes

When replacing a damaged or faulty electronic cassette, calibrate the replacement cassette to the
operating frequency of the fork assembly.
This section describes what is required for calibration. Calibration sequence steps 3 to 13 are
time-dependent and must be carried out within the noted times. The purpose of the time dependency
and switching sequence is to prevent an accidental calibration from occurring.
If this replacement is taking place in a hazardous area, only qualified personnel should perform the
replacement. All work in hazardous areas must be carried out in accordance with the local code.
For general hazardous area requirements of this equipment, see
Calibration of the device is complex and it may take several attempts before calibration is successful.
3.8.1

Replacement sequence

On Intrinsically Safe (I.S.) approved versions of the Rosemount 2130 Level Switch, it is recommended
that replacement and calibration be performed in a non-hazardous (safe) area.
Note
Intrinsically Safe approved cassettes can only be replaced with the same type of IS cassette.
Non-I.S. cassette types can be interchanged with other non-I.S. cassettes, but a new label must be fitted
and the original part number transferred to the new label.
Before starting the replacement and calibration procedure, ensure that any controlled process will not be
adversely affected.
To replace the cassette
1. Isolate and disconnect the power to the Rosemount 2130 Level Switch, and insulate the ends of the
wires. On units with a relay cassette, there may be more than one power source.
2. Remove the cover and disconnect the wires, noting any connections
switch position
3. Remove and retain the two fixing screws from the base of the cassette and unplug the cassette.
4. Plug in the replacement cassette, replace the screws, reconnect the wires, and set the mode switch to
"Wet On" with a one-second delay
5. Reconnect the power to the unit.
Figure 3-4. Example of Installed Cassette
Service and Troubleshooting
(Figure 3-5) on the cassette to be replaced.
OPERATION MODE
Dry On Mode Dry On Wet On
Dry
OUT -
+
Wet
0.3 0.3
1 1
3 3
10
Dry 10
Wet 30
30
Wet On Mode Seconds Delay
1 2 3 4
(Figure 3-6).
PLC/PNP
Isolate Supply
Before Removing
Service and Troubleshooting
Appendix B: Product Certifications.
(Figure 3-4) and the exact mode
January 2019
35