Emerson Rosemount 8800D Series Reference Manual page 112

Reference Manual
00809-0100-4004, Rev DC
Transient protection
The optional transient terminal block prevents damage to the flowmeter from transients
induced by lightning, welding, heavy electrical equipment, or switch gears. The transient
protection electronics are located in the terminal block.
The transient terminal block meets the following specifications:
IEEE C62.41 - 2002 Category B
3 kA crest (8 X 20 μs)
6 kV crest (1.2 X 50 μs)
6 kV/0.5 kA (0.5 μs, 100 kHz, ring wave)
Security lockout
When the security lockout jumper is enabled, the electronics will not allow you to modify
parameters that affect flowmeter output.
Output testing
Current source
Flowmeter may be commanded to set the electrical current to a specified value between 4
and 20 mA.
Frequency source
Flowmeter may be commanded to set the frequency to a specified value between
0 and 10000 Hz.
Low flow cutoff
Adjustable over entire flow range. Below selected value, output is driven to 4 mA and zero
pulse output frequency.
Humidity limits
Operates in 0–95% relative humidity under non-condensing conditions (tested to IEC
60770, Section 6.2.11).
Over-range capability
HART analog
Analog signal output continues to 105 percent of span, then remains constant with
increasing flow. The digital and pulse outputs will continue to indicate flow up to the upper
sensor limit of the flowmeter and a maximum pulse output frequency of 10400 Hz.
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Specifications and Reference Data
Specifications and Reference Data
May 2016