Rosemount 8800D Series User Manual

Reference Manual
00809-0100-4004, Rev BA
August 2010
4-9
Rosemount 8800D
Scaled D/A Trim
Scaled D/A Trim enables you to calibrate the flowmeter analog output using
a different scale than the standard 4-20 mA output scale. Non-scaled D/A
Trimming (described above), is typically performed using an ammeter where
calibration values are entered in units of milliamperes. Both non-scaled D/A
trimming and scaled D/A trimming allow you to trim the 4-20mA output to
approximately ±5% of the nominal 4mA end point and ±3% of the nominal
20mA end point. Scaled D/A Trimming allows you to trim the flowmeter using
a scale that may be more convenient based upon your method of
measurement.
For example, it may be more convenient for you to make current
measurements by direct voltage readings across the loop resistor. If your loop
resistor is 500 Ohms, and you want to calibrate the meter using voltage
measurements made across this resistor, you could rescale your trim points
from 4-20mA to 4-20mA x 500 ohm or 2-10 VDC. Once your scaled trim
points have been entered as 2 and 10, you can now calibrate your flowmeter
by entering voltage measurements directly from the voltmeter.
Recall Factory Trim
Recall Factory Trim enables you to return to the original factory trim values.
Pulse Output
Pulse Output enables you to configure the Pulse Output.
NOTE
The Field Communicator will allow configuration of the pulse features even if
the pulse option (Option P) was not ordered.
Pulse Output
The Rosemount 8800D comes with an optional pulse output option (P). This
enables the flowmeter to output the pulse rate to an external control system,
totalizer, or other device. If the flowmeter was ordered with the pulse mode
option, it may be configured for either pulse scaling (based on rate or unit) or
shedding frequency output. There are four methods for configuring the pulse
output:
•Off
• Direct (Shedding Frequency)
• Scaled Volume
• Scaled Velocity
• Scaled Mass
Field Comm. 1, 4, 2, 1, 7
Field Comm. 1, 4, 2, 1, 8
Field Comm. 1, 4, 2, 2
Field Comm. 1, 4, 2, 2, 1

Rosemount 8800D Series Specifications

General

Type	Vortex Flow Meter
Measurement Principle	Vortex Shedding
Operating Temperature	-40 to 185°F (-40 to 85°C)
Storage Temperature	-40 to 185°F (-40 to 85°C)
Communication Protocols	FOUNDATION Fieldbus
Material	316 stainless steel
Fluid Type	Liquid, Gas, Steam
Line Size	1/2 to 8 inches (15 to 200 mm)
Approvals	ATEX, IECEx, CSA, FM
Output Signal	4-20 mA
Process Connection	Flanged, Wafer, Threaded
Electrical Connection	M20
Protection Rating	IP66
Mounting Style	Wafer, Flanged