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Reference Manual
00809-0100-4860, Rev BC
Section 2: Installation
January 2013
Installation
Alarm
As part of normal operations, the Rosemount 8600D continuously runs a self-diagnostic
routine. If the routine detects an internal failure in the electronics, flowmeter output is driven to
a low or high alarm level, depending on the position of the failure mode jumper.
The failure mode jumper is labeled ALARM and is set at the factory per the CDS (Configuration
Data Sheet); the default setting is HI.
Security
You can protect the configuration data with the security lockout jumper. With the security
lockout jumper ON, any configuration changes attempted on the electronics are disallowed.
You can still access and review any of the operating parameters and scroll through the available
changes, but no actual changes will be permitted. The security lockout jumper is labeled
SECURITY and is set at the factory per the CDS; the default setting is OFF.
2.4.1 Failure mode vs. saturation output values
The failure mode alarm output levels differ from the output values that occur when the
operating flow is outside the range points. When the operating flow is outside the range points,
the analog output continues to track the operating flow until reaching the saturation value
listed below; the output does not exceed the listed saturation value regardless of the operating
flow. For example, with standard alarm and saturation levels and flows outside the 4—20 mA
range points, the output saturates at 3.9 mA or 20.8 mA. When the transmitter diagnostics
detect a failure, the analog output is set to a specific alarm value that differs from the saturation
value to allow for proper troubleshooting.
.
.
Table 2-1. Analog Output: Standard Alarm Values vs. Saturation Values
Level 4—20 mA Saturation Value 4—20 mA Alarm Value
Low 3.9 mA < 3.75 mA
High 20.8 mA 21.75 mA
Table 2-2. Analog Output: NAMUR-Compliant Alarm Values vs. Saturation Values
Level 4—20 mA Saturation Value 4—20 mA Alarm Value
Low 3.8 mA < 3.6 mA
High 20.5 mA 22.6 mA