Electrical Installations - Emerson Rosemount Apex Reference Manual

™
APEX and APEX Sentry
ELECTRICAL
INSTALLATIONS
Check Processor
Switches
Figure 2-18. Radar Gauge
Processor Switch Settings
2-22
™
Radar Gauge
Electronic boards are electrostatically sensitive. Failure to observe proper
handling precautions for static-sensitive components can result in damage to
the electronic components. Do not remove the APEX or APEX Sentry
electronic boards. The gauges are calibrated with particular boards; swapping
boards will negatively affect accuracy.
Table 2-3.
APEX Radar Gauge Switch Settings
Switch Bank Description
Switch 1 4–20 mA Alarm Output
Switch 2 Security Write Protection
Table 2-4.
Analog Output: Standard Alarm Values vs. Saturation Values
Level 4–20 mA Saturation Values
Low 3.9 mA
High 20.8 mA
Table 2-5.
Analog Output: NAMUR-Compliant Alarm Values vs. Saturation Values
(option codes C4 or CN)
Level 4–20 mA Saturation Values
Low 3.8 mA
High 20.5 mA
The gauge monitors its own operation. This automatic diagnostic routine is a
timed series of checks repeated continuously. If the diagnostic routine detects
a failure in the gauge, the 4–20 mA output is driven upscale (high) to 21 mA or
downscale (low) to 3.75 mA, depending on the position of Switch 1.
Security write protection prevents unauthorized access to configuration data
through the optional integral display or HART Communicator.
4–20 mA Alarm
Output Switch
Microprocessor
Chip
00809-0100-4731, Rev FA
Default Setting
High (ON)
Disabled (OFF)
4–20 mA Alarm Value
3.75 mA
21.75 mA
4–20 mA Alarm Value
3.6 mA
21.0 mA
ON
1 2
PROCESSOR BOARD
Reference Manual
April 2003
Position Settings
ON = High, OFF = Low
ON = Enabled, OFF = Disabled
Security Write
Protection
Switch