DigitalFlow™ DF868
GE
Sensing & Inspection Technologies
DigitalFlow™ DF868
Panametrics Liquid Ultrasonic Flowmeter
Abridged Manual
GE
Sensing & Inspection Technologies
DigitalFlow™ DF868
Panametrics Liquid Ultrasonic Flowmeter
Abridged Manual
914-176D1
March 2008
The DigitalFlow DF868 is a GE Panametrics product. GE Panametrics has joined other GE high-technology
businesses under a new name—GE Sensing & Inspection Technologies.
March 2008
Warranty
Each instrument manufactured by GE Sensing, Inc. is warranted to be
free from defects in material and workmanship. Liability under this
warranty is limited to restoring the instrument to normal operation or
replacing the instrument, at the sole discretion of GE. Fuses and
batteries are specifically excluded from any liability. This warranty is
effective from the date of delivery to the original purchaser. If GE
determines that the equipment was defective, the warranty period is:
•
one year for general electronic failures of the instrument
•
one year for mechanical failures of the sensor
If GE determines that the equipment was damaged by misuse,
improper installation, the use of unauthorized replacement parts, or
operating conditions outside the guidelines specified by GE, the
repairs are not covered under this warranty.
The warranties set forth herein are exclusive and are in lieu of
all other warranties whether statutory, express or implied
(including warranties of merchantability and fitness for a
particular purpose, and warranties arising from course of
dealing or usage or trade).
iii
March 2008
Return Policy
If a GE Sensing, Inc. instrument malfunctions within the warranty
period, the following procedure must be completed:
1. Notify GE, giving full details of the problem, and provide the model
number and serial number of the instrument. If the nature of the
problem indicates the need for factory service, GE will issue a
RETURN AUTHORIZATION number (RA), and shipping instructions
for the return of the instrument to a service center will be
provided.
2. If GE instructs you to send your instrument to a service center, it
must be shipped prepaid to the authorized repair station indicated
in the shipping instructions.
3. Upon receipt, GE will evaluate the instrument to determine the
cause of the malfunction.
Then, one of the following courses of action will then be taken:
iv
•
If the damage is covered under the terms of the warranty, the
instrument will be repaired at no cost to the owner and returned.
•
If GE determines that the damage is not covered under the terms
of the warranty, or if the warranty has expired, an estimate for the
cost of the repairs at standard rates will be provided. Upon receipt
of the owner’s approval to proceed, the instrument will be repaired
and returned.
March 2008
Table of Contents
Chapter 1: Installation
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Site Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Electronics Console Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Flowcell Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Transducer Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Cable Lengths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Temperature Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Transducer Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Installing a Flowcell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Installing Temperature Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Mounting the DF868 Electronic Console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
CE Mark Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
External Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Making Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Wiring the Line Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Wiring the Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Wiring the 0/4-20 mA Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Wiring the Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Wiring an Alarms Option Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Wiring a 0/4-20 mA Analog Inputs Option Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Wiring a Totalizer/Frequency Outputs Option Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Wiring an RTD Inputs Option Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Wiring a 0/4-20 mA Analog Outputs Option Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Wiring a MODBUS Option Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
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March 2008
Table of Contents (cont.)
Chapter 2: Initial Setup
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Navigating Through the User Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Accessing the User Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
1-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Activating a Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
1-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Entering System Data for a Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
1-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2-Channel Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
1- and 2-Channel Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Entering Pipe Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Transducer Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Pipe Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Pipe OD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Pipe Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Lining. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Path and Axial Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Tracking Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Fluid Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Reynolds Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Calibration Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Exiting the User Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
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March 2008
Table of Contents (cont.)
Chapter 3: Operation
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Powering Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Using the Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Using the Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Using the Console Control Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Audio Alarm Volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Stopwatch Totalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Display Brightness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Display Contrast. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Setting the Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Setting the Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Setting the Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Taking Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Foundation Fieldbus Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Displaying Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
The BIG Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
The DUAL Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Setting the LCD Backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Activating Sleep Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Chapter 4: Calibration
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Calibrating the Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Accessing the Calibration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Calibrating the Low End of the Output Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Calibrating the High End of the Output Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Testing the Analog Output Linearity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Calibrating the Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Accessing the Calibration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
aLOW Option = [F1]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
aHIGH Option = [F2] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4 mA Option = [F3]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
20 mA Option = [F4] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Leaving the Calibration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Calibrating the RTD Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Accessing the Calibration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Probe Option = [F1] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Numer Option = [F2] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
vii
March 2008
Table of Contents (cont.)
Appendix A: Measuring P and L Dimensions
Measuring P and L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
viii
Chapter 1
Installation
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Site Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Installing a Flowcell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Installing Temperature Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Mounting the DF868 Electronic Console . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
CE Mark Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Making Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
March 2008
Introduction
To ensure safe and reliable operation of the DF868 Ultrasonic Liquid
Flowmeter, the system must be installed in accordance with the
guidelines established by GE engineers.
WARNING!
The Model DF868 flowmeter can measure the flow rate
of many liquids, some of which are potentially
hazardous. In such cases, proper safety practices must
be observed.
Be sure to follow all applicable local safety codes and
regulations for installing electrical equipment and
working with hazardous liquids or flow conditions.
Consult company safety personnel or local safety
authorities to verify the safety of any procedure or
practice.
Site Considerations
Because the relative physical locations of the flowcell and the DF868
electronics console are important, use the guidelines in this section to
plan the DF868 system installation.
Electronics Console
Location
The standard DF868 electronics enclosure is a Type-4X
weather-resistant, dust-tight, indoor/outdoor type. Typically, the
electronics console is mounted in a meter shed. When choosing a
mounting site, make sure that the location permits easy access to the
console for programming, testing, and servicing.
Note: For compliance with the European Union’s Low Voltage
Directive (73/23/EEC), this unit requires an external power
disconnect device such as a switch or circuit breaker. The
disconnect device must be marked as such, clearly visible,
directly accessible, and located within 1.8 m (6 ft) of the unit.
Flowcell Location
Installation
The pipeline flowcell consists of the flow transducers and any
temperature transducers employed as part of the flowmeter system.
Ideally, choose a section of pipe with clear access to the flowcell,
such as a long stretch of pipe that is above ground. However, if the
flowcell is mounted on an underground pipe, dig a pit around the pipe
to facilitate installation of the transducers.
1-1
March 2008
Transducer Location
For a given fluid and pipe, the DF868 accuracy depends primarily on
the location and alignment of the transducers. In addition to
accessibility, when planning for transducer location, adhere to the
following guidelines:
1. Locate the transducers so that there are at least 10 pipe diameters
of straight, undisturbed flow upstream and 5 pipe diameters of
straight, undisturbed flow downstream from the measurement
point. To ensure undisturbed flow, avoid sources of turbulence in
the fluid such as valves, flanges, expansions and elbows.
2. Because sediment at the bottom of the pipe and gas at the top of
the pipe may cause attenuation of the ultrasonic signal, locate the
transducers on the side of a horizontal pipe when possible. If
limited pipe access necessitates top-mounted transducers and the
ultrasonic path includes a reflection, shift the transducers to at
least 10° off top center. This will minimize the influence of any
sediment or gas on the reflected ultrasonic signals.
Cable Lengths
Locate the flowcell and transducers as close as possible to the
electronics console. GE supplies transducer cables up to 300 m
(1,000 ft) in length. If longer cables are required, consult the factory
for assistance.
Temperature Transmitters
When installing temperature transmitters in the flowcell, locate them
downstream of the flow transducers. These transmitters should be
positioned no closer to the flow transducers than 2 pipe diameters and
no further away from the flow transducers than 20 pipe diameters.
Transducer Cables
When installing the transducer cables, always observe established
standard practices for the installation of electrical cables. Specifically,
do not route transducer cables alongside high amperage AC power
lines or any other cables that could cause electrical interference. Also,
protect the transducer cables and connections from the weather and
corrosive atmospheres.
Note: When using non-GE cables to connect the flow transducers to
the DF868 electronics console, the cables must have electrical
characteristics identical to the GE cables. Type RG 62 a/u
coaxial cable should be used, and each cable must be the
same length within ±4 in. (±10 cm).
1-2
Installation
March 2008
Installing a Flowcell
A flowcell is the section of pipe where the transducers are mounted. It
can be created either by mounting the transducers on the existing
pipeline or by mounting them on a spoolpiece. A spoolpiece is a
separately manufactured pipe section, matched to the existing pipe,
which contains ports for mounting the transducers. This approach
allows the transducers to be aligned and calibrated before inserting
the spoolpiece into the pipeline.
Figure 1-1 below shows a diagram of a typical DF868 system.
Transducer
Liquid
Flowcell
Flow
Transducer
Electronics
Console
Figure 1-1: A Typical Model DF868 System
Installing Temperature
Transmitters
Optional temperature transmitters may be installed as part of the
flowcell, near the ultrasonic transducer ports. These transmitters must
use a 0/4-20 mA signal to transmit the temperature values to the
DF868 electronics console. The electronics console will provide a
24 VDC signal to power the transmitters. Any type of transmitters or
sensors may be used, but they must have an accuracy equal to ±0.5%
or better.
Note: Resistive Thermal Devices (RTDs) are a good choice for the
temperature sensor.
Installation
1-3
March 2008
Installing Temperature
Transmitters (cont.)
Typically, a 1/2” NPT female threaded port is used to mount the
transmitters on the flowcell. If the pipeline is insulated, the coupling
may need to be extended to provide convenient access. Of course,
other types of mounting ports, including flanged ports, may be used
for the transmitters.
Figure 1-2 below shows a typical mounting arrangement for a
temperature transmitter. The temperature sensor should protrude 1/4
to 1/2 way into the pipe.
Temperature
Transmitter
RTD
Thermowell
Coupling
Flowcell Wall
Figure 1-2: Typical Temperature Transmitter Mounting
Mounting the DF868
Electronic Console
The standard DF868 electronics package is housed in a NEMA-4X
weather-resistant enclosure. Refer to Figure 1-9 on page 1-19 for the
mounting dimensions of this enclosure.
WARNING!
Proper grounding of the DF868 chassis is required to
prevent the possibility of electric shock. See Figure 1-10
on page 1-20 to locate the internal ground connection.
1-4
Installation
March 2008
CE Mark Compliance
For CE Mark compliance, the DF868 flowmeter must be wired in
accordance with the instructions in this section.
IMPORTANT: CE Mark compliance is required for all units intended
for use in EEC countries.
Wiring
The DF868 must be wired with the recommended cable, and all
connections must be properly shielded and grounded. Refer to
Table 1-1 below for the specific requirements.
Table 1-1: Wiring Modifications
Termination
Connection
Cable Type
Modification
Transducer
RG62 a/u
Add a metallic cable
clamp from the braid to
the chassis ground.
Armored RG62 a/u or
None - grounded using
conduit
a cable gland.
Input/Output 22 AWG shielded (e.g. Terminate the shield to
Baystate #78-1197)
the chassis ground.
Armored conduit
None - grounded using
a cable gland.
Power
14 AWG, 3 conductor,
An external ground to
shielded (e.g. Belden
the chassis is required.
#19364)
Armored Conduit
None - grounded using
a cable gland.
Shielding
For CE compliance, power and I/O cables must be
shielded. Cables to be terminated within a cable
gland at the DF868. Shielded cable is not required
when installations include metal conduit.
External Grounding
For CE Mark compliance, the electronics enclosure and the
transducer fixture must each have an external ground wire attached.
Note: If the DF868 is wired as described in this section, the unit will
comply with the EMC Directive 89/336/EEC.
Installation
1-5
March 2008
Making Electrical
Connections
ATTENTION EUROPEAN USERS!
To meet CE Mark requirements, all cables must be
installed as described on the previous page.
This section contains instructions for making all the necessary
electrical connections to the DF868 flowmeter. Refer to Figure 1-10
on page 1-20 for a complete wiring diagram of the meter.
Except for the power connector, all electrical connectors are stored in
their terminal blocks during shipment and may be removed from the
enclosure for more convenient wiring. Feed the cables through the
conduit holes on the bottom of the enclosure, attach the wires to the
appropriate connectors and plug the connectors back into their
terminal blocks.
Note: For compliance with the European Union’s Low Voltage
Directive (73/23/EEC), a transparent plastic shroud protects
the electrical connections. The shroud must remain in place,
except while wiring the unit. Reinstall the shroud after the
wiring has been completed.
After the DF868 is completely wired, proceed to Chapter 2, Initial
Setup, to configure the unit for operation.
1-6
Installation
March 2008
Wiring the Line Power
ATTENTION EUROPEAN USERS!
To meet CE Mark requirements, all cables must be
installed as described on the previous page.
The DF868 may be ordered for operation with power inputs of:
•
100-120 VAC
•
220-240 VAC
•
12-28 VDC
The label on the shroud inside the electronics enclosure, just above
the TB1 line power terminal block, lists the required line voltage and
the fuse rating for the meter. Be sure to connect the meter only to the
specified line voltage.
Note: For compliance with the European Union’s Low Voltage
Directive (73/23/EEC), this unit requires an external power
disconnect device such as a switch or circuit breaker. The
disconnect device must be marked as such, clearly visible,
directly accessible, and located within 1.8 m (6 ft) of the unit.
Refer to Figure 1-3 on the next page or Figure 1-10 on page 1-20 to
locate terminal block TB1 and connect the line power as follows:
WARNING!
Improper connection of the line power leads or
connecting the meter to the incorrect line voltage will
damage the unit. It will also result in hazardous
voltages at the flowcell and associated piping and
within the electronics console.
Installation
1-7
March 2008
Wiring the Line Power
(cont.)
1. Remove the plastic shroud that covers the terminal blocks.
2. Strip 1/4” (6 mm) of insulation from the end of the line and neutral
AC power leads (or the positive and negative DC power leads),
and 1/2” (12 mm) from the end of the ground lead.
3. Connect the ground lead to the internal ground connection located
on the side panel of the enclosure (see Figure 1-3 below).
IMPORTANT: The incoming ground lead must be connected to the
internal ground connection.
4. Connect the neutral AC power lead (or the negative – DC power
lead) to TB1-2 and the line AC power lead (or the positive DC
power lead) to TB1-3 as shown in Figure 1-3 below.
IMPORTANT: Do not remove the existing PC board ground wire or
the cover ground wire.
G – + DC
G N/L2 L1 AC
PC Board
Ground Wire
TB1
Cover
Ground Wire
1
2
3
AC Line Power
or DC +
Gro
Internal
Ground
Connection
AC Neutral/Line
or DC –
u nd
Figure 1-3: Line Power Connections
1-8
Installation
March 2008
Wiring the Transducers
To wire the ultrasonic flow transducers, complete the following steps:
WARNING!
Before connecting the transducers, take them to a safe
area and discharge any static buildup by shorting the
center conductor of the transducer cables to the metal
shield on the cable connector.
1. If an optional lightning protector is being installed, connect it to
the electronics end of the cables according to the instructions
provided.
2. Locate the CH1 transducer cables and connect them to the two CH1
transducers.
3. Refer to the wiring diagram in Figure 1-10 on page 1-20 and
connect the transducer cables to the CH1 terminal block. Then,
secure the cable clamp.
4. For a 2-channel DF868 flowmeter, repeat steps 2-3 to wire the CH2
transducers to terminal block CH2.
Note: It is not required that CH2 of a 2-channel DF868 be used. This
channel may be left inactive for future use.
After the wiring has been completed, the transducer channel(s) must
be activated before measurements can begin. See Chapter 2, Initial
Setup, for instructions.
Installation
1-9
March 2008
Wiring the 0/4-20 mA
Analog Outputs
The standard DF868 flowmeter includes two isolated 0/4-20 mA
analog outputs (designated as A and B). Connections to these outputs
may be made with standard twisted-pair wiring. The current loop
impedance for these circuits must not exceed 550 ohms.
Refer to Figure 1-10 on page 1-20 for the location of terminal block
I/O and wire the terminal block as shown.
Wiring the Serial Port
The DF868 is equipped with a built-in serial communications port.
The standard port is an RS232 interface, but an optional RS485
interface is available upon request. Proceed to the appropriate section
for wiring instructions.
Wiring the RS232 Interface Use the serial port to connect the DF868 flowmeter to a printer, an
ANSI terminal or a personal computer. The RS232 interface is wired
as Data Terminal Equipment (DTE), and the signals available at
terminal block J1 are shown in Table 1-2 below. Refer to Figure 1-10
on page 1-20 and complete the following steps:
1. Disconnect the main power to the unit.
2. Install the required cable clamp in the chosen conduit hole on the
side of the electronics enclosure.
3. Use the information in Table 1-2 below to construct a suitable
cable for connecting the DF868 to the external device. If desired,
an appropriate cable may be purchased from GE.
Table 1-2: RS232 Connection to DCE or DTE Device
DCE
DCE
DTE
DTE
J1
Signal
DB25
DB9
DB25
DB9
Pin #
Description
Pin #
Pin #
Pin #
Pin #
1-10
5
DTR (Data
Terminal Ready)
20
4
20
4
6
CTS
(Clear to Send)
4
7
5
8
7
COM (Ground)
7
5
7
5
8
RX (Receive)
2
3
3
2
9
TX (Transmit)
3
2
2
3
Installation
March 2008
Wiring the RS232 Interface
(cont.)
4. Feed the flying leads end of the cable through the conduit hole and
wire it to terminal block J1. Connect the other end of the cable to
the printer, ANSI terminal or personal computer, and secure the
cable clamp.
After the wiring has been completed, consult the User’s Manual for
the external device to configure it for use with the DF868.
Wiring the RS485 Interface Use the optional RS485 serial port to network multiple DF868
flowmeters to a single computer terminal. Upon request, the standard
RS232 port on the DF868 may be configured as a two-wire,
half-duplex RS485 interface, through a device such as the INMAC
Model 800052 RS232-RS422/RS485 converter.
IMPORTANT: The DF868 must be configured at the factory for
RS485 operation.
To wire the RS485 serial port, refer to Figure 1-10 on page 1-20 and
complete the following steps:
1. Disconnect the main power to the unit.
2. Install the required cable clamp in the chosen conduit hole on the
side of the electronics enclosure.
3. Feed one end of the cable through the conduit hole, wire it to
terminal block J1 and secure the cable clamp. Connect the other
end of the cable to the converter, as shown in Figure 1-4 below.
DF868
NC 6
NC 7
RX 8
TX 9
Converter
1 TD OUT
2
3
4 RD IN
Figure 1-4: Typical RS485 Connections
Installation
1-11
March 2008
Wiring the Ethernet
Interface
The DF868 can be configured to use an ethernet connection to
communicate with an internal network as follows:
1. Install an ethernet option card in either slot 5 or slot 6 of the
DF868 electronics console. This card has a unique MAC (IP)
address and it includes an RJ45 connector.
2. Plug one end of a standard ethernet cable into the RJ45 connector
on the option card, and route the cable through one of the cable
glands on the bottom of the DF868.
3. Connect the other end of the ethernet cable to the Ethernet
network according to the network administrator’s instructions.
4. Make an external connection between the Ethernet option card and
the RS232 connector on the DF868, as indicated in Table 1-3
below.
Note: The MAC address for the DF868 option card is included with
the documentation. For more information on setting up the
MAC address consult your network administrator.
Table 1-3: External Connections
FROM:
TO:
RS232 Terminal Block
Terminal Block TB1
(on main circuit board)
(on ethernet card)
Wiring the MODBUS/TCP
Interface
TX
Pin 1
RX
Pin 2
RTN
Pin 3
The DF868 can be configured to use a MODBUS/TCP interface to
communicate with an internal network as follows:
1. Install a MODBUS/TCP option card in either slot 5 or slot 6 of the
DF868 electronics console. This card has a unique MAC (IP)
address and it includes an RJ45 connector.
2. Plug one end of a standard ethernet cable into the RJ45 connector
on the option card, and route the cable through one of the cable
glands on the bottom of the DF868.
3. Connect the other end of the ethernet cable to the Ethernet
network according to the network administrator’s instructions.
Note: The MAC address for the DF868 option card is included with
the documentation. For more information on setting up the
MAC address consult your network administrator.
1-12
Installation
March 2008
Wiring the Foundation
Fieldbus Network
The DF868 can be wired for Foundation Fieldbus network
communication as follows:
Note: Depending on the configuration of your DF868, either
connector J8 or connector J9 will be available. Figure 1-5
below shows a meter with the J8 connector installed.
1. Make the Fieldbus network connections to Pins 1 and 2 of
connector J8 or J9 (see Figure 1-5 below).
2. An optional shield connection may be made to Pin 3 of the network
connector.
For normal operation, no connections are made pins 7 and 9 of the
connector. However, these pins may be used to reset the network
board to factory the defaults as follows:
1. Connect a temporary jumper between Pin 7 and Pin 9.
2. Reboot the instrument by turning the power OFF and then back ON.
3. Ten seconds after the power has been restored to the unit, remove
the jumper to return the network board to normal operation.
9
J9
1
9
J8
1
Figure 1-5: DF868 with J8 Fieldbus Connector
Installation
1-13
March 2008
Wiring an Alarms Option
Card
The DF868 can have up to 4 alarms option cards. Each card includes
three Form C relays (designated as A, B and C). These relays may be
either General Purpose types or Hermetically Sealed types for use in
Class I, Division 2 hazardous areas.
The alarm relays can be wired as either Normally Open (NO) or
Normally Closed (NC), and they may be wired for either conventional
or fail-safe operation. Figure 1-6 below shows the operation of a NO
alarm relay in both conventional and fail-safe mode.
•
Connect the two wires required for each alarm relay as shown in
Figure 1-10 on page 1-20.
Conventional,
not triggered
Fail-Safe,
not triggered
NO
NO
C
C
NC
NC
Alarm
Monitoring
Device
Alarm
Monitoring
Device
Conventional,
triggered
Fail-Safe,
triggered or power failure
NO
NO
C
C
NC
NC
Alarm
Monitoring
Device
Alarm
Monitoring
Device
Figure 1-6: Conventional and Fail-Safe Alarm Operation
1-14
Installation
March 2008
Wiring a 0/4-20 mA
Temperature and pressure transmitters installed in the flowcell can
Analog Inputs Option Card provide data to the DF868 via an optional 0/4-20 mA analog inputs
card. This option card includes two isolated 0/4-20 mA analog inputs
(designated as A and B), each of which includes a 24 VDC power
supply for loop-powered transmitters.
Note: To program the DF868 to use the option card, it is necessary
to know which input is assigned to which parameter.
The analog inputs, which have an impedance of 118 ohms, should be
connected with standard twisted-pair wiring. Power to the
transmitters may be supplied either by the integral 24 VDC power
supply on the analog input card or by an external power supply.
Figure 1-7 below shows typical wiring diagrams, with and without an
external power supply, for one of the analog inputs.
With External Power Supply
24 VDC
POWER SUPPLY
+
Analog Input
Transmitter
+ IN
+
RTN
Sensor
- OUT
+24V
Analog Input
Transmitter
+
- OUT
RTN
+24V
Sensor
+ IN
With Internal Power Supply
Figure 1-7: Analog Input Wiring Diagrams
Installation
1-15
March 2008
Wiring a 0/4-20 mA
Analog Inputs Option Card
(cont.)
Wire the analog input option card terminal block in accordance with
the pin number assignments shown in Figure 1-10 on page 1-20.
Note: If the flowmeter system includes additional transmitters, the
DF868 can accommodate up to three more analog inputs
option cards.
IMPORTANT: The analog inputs on the option card must be
calibrated before use. This can be done with the
DF868 built-in analog outputs, but you must calibrate
the analog outputs first.
Wiring a
Totalizer/Frequency
Outputs Option Card
The DF868 can accommodate up to four totalizer/frequency outputs
option cards. Each totalizer/frequency outputs option card provides
four outputs (designated as A, B, C, and D) that can be used as either
totalizer or frequency outputs.
Each totalizer/frequency output requires two wires, which must be
connected in accordance with the pin number assignments shown in
Figure 1-10 on page 1-20. Figure 1-8 below shows sample wiring
diagrams for totalizer and frequency output circuits.
Totalizer Output
Model DF868
Pulse Counter
Max. Current:
Max. Voltage:
Isolation Voltage:
Max. Load Power:
4A
150V
500V
10W In
Volts +
(Int. Pwr. Sup.)
Load
(minimum
10 kW)
NO
C
C = Isolated Return
Volts (Common)
Frequency Output
Model DF868
Frequency Counter
+5V
200 Ω
IN
NO
Common
C
C = Isolated Return
Figure 1-8: Totalizer/Frequency Outputs Wiring
1-16
Installation
March 2008
Wiring an RTD Inputs
Option Card
The DF868 can accommodate up to four RTD inputs option cards.
Each RTD inputs option card provides two direct RTD inputs
(designated as A and B). Each RTD input requires three wires, which
should be fed through one of the conduit holes on the bottom of the
electronics console.
Note: For maximum accuracy, the three wires must be of equal
length.
Wire the option card terminal block in accordance with the pin
number assignments shown in Figure 1-10 on page 1-20.
Wiring a 0/4-20 mA
Analog Outputs Option
Card
The DF868 flowmeter can accommodate up to 4 analog outputs
option cards. Each analog outputs option card includes four isolated
0/4-20 mA outputs (designated as A, B, C and D).
Connections to these outputs may be made with standard twisted-pair
wiring. The total current loop impedance for these circuits must not
exceed 1000 ohms. Wire the option card terminal block in accordance
with the pin number assignments shown in Figure 1-10 on page 1-20.
Wiring a MODBUS Option
Card
A properly configured DF868 can use the RS485 standard for
MODBUS communications. This standard allows up to 32 nodes
(drivers and receivers) on one multidrop network, at distances up to
4,000 ft (1200 m). To connect the instrument to the host system, GE
recommends using a 24-gauge (24 AWG) twisted-pair cable with a
characteristic impedance of 120 ohms and a 120-ohm termination at
each end of the communications line.
The MODBUS option card must be installed in either slot 5 or slot 6
of the DF868. On the option card, pin 1 is the [TMT-] inverting or
negative connection and pin 2 is the [TMT+] non-inverting or positive
connection. To link the DF868 to the control system, connect the two
wires of the twisted-pair cable from these terminals to the
corresponding terminals at the control system, in accordance with the
pin number assignments shown in Figure 1-10 on page 1-20.
IMPORTANT: If two MODBUS option cards are installed in the
DF868, only the card in slot 5 is recognized.
Installation
1-17
Figure 1-9: DF868 Type 4X Enclosure (ref. dwg #425-208)
March 2008
Installation
1-19
G N/L2 L1
G
Installation
–
+
Figure 1-10: DF868 Electronics Console Wiring (ref. dwg #702-213)
March 2008
1-20
Chapter 2
Initial Setup
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Navigating Through the User Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Accessing the User Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Activating a Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Entering System Data for a Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Entering Pipe Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Exiting the User Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
March 2008
Introduction
This chapter provides instructions for entering the basic programming
data required to place the DF868 flowmeter into operation. Before the
DF868 can begin taking measurements and displaying valid data, the
system and pipe parameters must be programmed into the meter. In
addition, if you plan to use both channels of a 2-channel meter, each
channel must be activated prior to use.
Navigating Through the
User Program
To program the DF868 for initial use, the following menus within the
User Program will be accessed:
•
ACTIV - to select the desired measurement method and, for a
2-channel meter, to activate the channels
•
SYSTM - to enter the required system data
•
PIPE - to enter the required pipe parameters
As a guide in following the programming instructions in this chapter,
the relevant portions of the DF868 menu map have been reproduced
in Figure 2-1 on page 2-17 and Figure 2-2 on page 2-18.
Note: There are minor differences at the start of the ACTIV and SYSTM
submenus for the 1-Channel and 2-Channel models, but the
PIPE menus are identical.
In this chapter, it is assumed that the left DF868 display screen is
active. If the right display screen is active, only the function key
designations change. That is, replace [F1]-[F4] with [F5]-[F8].
Use the keypad to navigate through the User Program. The menu
map may be followed in sequence, or the [↑] and [↓] keys may be
used to scroll through the prompt screens. The [←] key may be used
to delete the last alphanumeric character that was entered from the
keypad.
Initial Setup
2-1
March 2008
Accessing the User
Program
To access the User Program, press the [PROG] key on the keypad.
1-Channel Meter
For a 1-Channel DF868, the measurement mode screen is replaced by
the following initial programming mode screen:
Note: If the security feature is active, enter the password and press
[ENT] to enter the User Program
PROGRAM
PROGRAM
status
ACTIV SYSTM
2-Channel Meter
Start ‰
PIPE
At the User Program screen
shown, press [F1] and proceed to
the next page for instructions.
I/O
For a 2-Channel DF868, the following two-step sequence is required
to reach the initial programming screen:
PROGRAM
PROGRAM
Channel 1
CH1
CH2
Chan 1
Start ‰
GLOBL
PROGR
Channel PROGRAM
status
ACTIV SYSTM PIPE
Press [F1] or [F2] to select the
submenu for Channel 1 or
Channel 2, respectively, from the
option bar.
SAVE
Start ‰
At the User Program screen
shown, press [F1] and proceed to
the next page for instructions.
I/O
Note: In this manual, only the programming of Channel 1 is
described. To program Channel 2, simply repeat the same
procedures presented for Channel 1.
2-2
Initial Setup
March 2008
Activating a Channel
The ACTIV submenu permits selection of the desired measurement
method. In addition, it is used to activate/deactivate one or both of the
channels in a 2-Channel DF868.
1-Channel Meter
1. Enter the ACTIV submenu by pressing [F1] at the User PROGRAM
prompt.
2. Press [F1] to activate the channel in Transit-Time mode, or [F2] to
activate the channel in TransFlection mode.
2-Channel Meter
1. Enter the ACTIV submenu by pressing [F1] at the Channel PROGRAM
prompt.
2. Press [F1] (Off) to deactivate the channel and return to the Channel
PROGRAM prompt, or press [F2] to activate the channel in
Transit-Time mode, or [F3] to activate TransFlection mode.
Note: If your DF868 is not equipped with TransFlection mode, the
TRNFL option does not appear.
Proceed directly to the next section to program the SYSTM submenu.
Initial Setup
2-3
March 2008
Entering System Data for
a Channel
Begin the programming of the SYSTM submenu in either the
1-Channel section below or the 2-Channel section on the next page.
1-Channel Meter
For the 1-Channel DF868, the information entered in the SYSTM
submenu pertains to the global operation of the flowmeter.
1. At the User Program screen, press the [F2] function key to
program the SYSTM submenu.
2. Enter a Site Label of up to 9 characters and press the [ENT] key.
(While taking measurements, the site label appears on the locator
bar.)
3. Enter a Site Message of up to 21 characters. Use this screen to
enter a brief description of the site. When the message has been
entered, press the [ENT] key.
4. Press [F1] to turn the Energy Option OFF or press [F2] to turn it
ON. (The Energy Option calculates the energy of a system based
on temperatures at the supply and return points, and the flow of
fluid.)
5. To select the System Units, press [F1] to display parameters and
measurements in English units or press [F2] to display parameters
and measurements in Metric units.
6. To program the Totalizer Option, press [F1] to measure totals
automatically, or press [F2] to measure totals manually.
The remainder of the SYSTM submenu is identical for the 1-Channel
and 2-Channel versions of the DF868. Proceed to the 1- and
2-Channel Meters section on page 2-6 to complete the programming
of this submenu.
2-4
Initial Setup
March 2008
2-Channel Meter
For the 2-Channel DF868, the information entered in the SYSTM
submenu pertains only to the currently selected channel.
1. At the User Program screen shown, press [F2] to program the
SYSTM submenu.
2. Enter a Channel Label of up to 9 characters. While taking
measurements, the channel label will appear on the locator bar.
Press [ENT].
3. Enter a Channel Message of up to 21 characters. Press [ENT].
4. Press [F1] to turn the Energy Option OFF or press [F2] to turn it
ON. (The Energy Option calculates the energy of a system based
on temperatures at the supply and return points, and the flow of
fluid.)
Note: For a 2-Channel DF868, the System Units and Totalizer
prompts, which are not required to make the unit operational,
are located in the GLOBL submenu.
The remainder of the SYSTM submenu is identical for the 1-Channel
and 2-Channel versions of the DF868. Proceed to the 1- and
2-Channel Meters section on page 2-6 to complete the programming
of this submenu.
Initial Setup
2-5
March 2008
1- and 2-Channel Meters
1. Use the [F1]-[F4] and [→] keys to select the desired Volumetric
Units for the flow rate display.
The abbreviations and definitions of all the available volumetric units
are shown in Table 2-1 below. The choices shown on the option bar
are determined by the selections made at the previous SYSTEM UNITS
prompt screen.
Table 2-1: Volumetric Unit Options
English Volumetric Units
Metric Volumetric Units
GAL/S - U.S. Gallons per Second
L/S - Liter per Second
GAL/M - U.S. Gallons per Minute
L/M - Liters per Minute
GAL/H - U.S. Gallons per Hour
L/H - Liters per Hour
MGD - Millions of U.S. Gallons per Day
ML/D - Millions of Liters per Day
ft3/s - Cubic Feet per Second
m3/s - Cubic Meters per Second
ft3/m - Cubic Feet per Minute
m3/m - Cubic Meters per Minute
ft3/h - Cubic Feet per Hour
Mm3/h - Millions of Cubic Meters per Hour
Mft3/d - Millions of Cubic Feet per Day
Mm3/d - Millions of Cubic Meters per Day
BBL/S - Barrels per Second
BBL/S - Barrels per Second
BBL/M - Barrels per Minute
BBL/M - Barrels per Minute
BBL/H - Barrels per Hour
BBL/H - Barrels per Hour
BBL/D - Barrels per Day
BBL/D - Barrels per Day
MBBL/D - Millions of Barrels per Day
MBBL/D - Millions of Barrels per Day
Acre-inch/sec - Acre-inches per second
N/A
Acre-inch/min - Acre-inches per minute
N/A
Acre-inch/hr - Acre-inches per hour
N/A
Acre-inch/day - Acre-inches per day
N/A
Acre-foot/sec - Acre-feet per second
N/A
Acre-foot/min - Acre-feet per minute
N/A
Acre-foot/hr - Acre-feet per hour
N/A
Acre-foot/day - Acre-feet per day
N/A
2-6
Initial Setup
March 2008
1- and 2-Channel Meters
(cont.)
2. Press [F1]-[F4] to select the Vol Decimal Digits (the desired number
of digits to the right of the decimal point) in the volumetric flow
rate display.
3. Use the [F1]-[F4] and [→] keys to select the Totalizer Units.
The abbreviations and definitions of all the available totalizer units
are shown in Table 2-2 below. The choices shown on the option bar in
the prompt screen above are determined by the selections made at the
previous SYSTEM UNITS prompt screen.
Table 2-2: Totalizer Unit Options
English Totalizer Units
Metric Totalizer Units
Gal - U.S. Gallons
L - Liters
MGAL - Mega U.S. gallons
ML - Megaliters
ft3 - Cubic Feet
m3- Cubic Meters
Mft3 - Mega Cubic Feet
Mm3- Mega Cubic Meters
BBL - Barrels
BBL - Barrels
MBBL - Megabarrels
MBBL - Megabarrels
Acre-inches
Acre-feet
4. Press [F1]-[F4] to select the Total Decimal Digits (the digits to the
right of the decimal point) in the totalized flow display.
Initial Setup
2-7
March 2008
Mass Flow
If the Mass Flow prompt in the SETUP submenu is not enabled, skip
this section. However, the following programming sequence appears
if Mass Flow is enabled.
1. Use the [F1]-[F4] keys to select the desired Mass Flow units, listed
in Table 2-3 below.
Table 2-3: Available Mass Flow Units
English
Metric
LB = Pounds
KG = Kilograms
KLB = Thousands of LB
TONNE = Metric Tons (1000 KG)
MMLB = Millions of LB
TONS = Tons (2000 LB)
2. Use the [F1]-[F4] keys to select the desired Mass Flow Time units.
3. Use the [F1]-[F4] keys to select the MDOT Decimal Digits (the
digits to the right of the decimal point) for displaying mass flow.
4. Use the [F1]-[F4] keys to select the Mass (Totalizer) units, listed in
Table 2-3 above.
5. Use the [F1]-[F4] keys to select the Mass Decimal Digits (the digits
to the right of the decimal point) for displaying totalized mass
flow.
Energy Option
If you did not select the Energy Option earlier, the meter now returns
to the initial User (or Channel) Program screen. But if you selected
the Energy Option, several more prompts appear.
1. Use the [F1]-[F4] keys to select the desired Power units, listed in
Table 2-4 below.
Table 2-4: Power Unit Options
English Power Units
Metric Power Units
2-8
kBTU—Thousands of British
Thermal Units per Hour
kCAL/sec—
Kilocalories/second
MMBTU—Millions of British
Thermal Units per Hour
MCAL/sec—
MegaCalories/second
kW—kilowatts
kW—kilowatts
Tons
MW—Megawatts
Initial Setup
March 2008
Energy Option (cont.)
2. Use the [F1]-[F4] keys to select the Power Decimal Digits (the
digits to the right of the decimal point) for displaying power.
3. Use the [F1]-[F4] keys to select the Total Energy units, shown in
Table 2-5 below.
Table 2-5: Energy Unit Options
English Energy Units
Metric Energy Units
kBTU—Thousands of British
Thermal Units
kCAL—Kilocalories
MMBTU—Millions of British
Thermal Units
MCAL—MegaCalories
kWHr—Kilowatt-Hours
kW—Kilowatt-Hour
Tons
MW—Megawatt-Hour
4. Use the [F1]-[F4] keys to select the Energy Decimal Digits (the
digits to the right of the decimal point) for displaying total energy.
5. Press [F1] to make measurements in a Cooling system, or [F2] to
make measurements in a Heating system.
6. Press [F1] to conduct Flow Measurement at the point of return
(where the liquid exits), or [F2] to measure flow at the point of
supply (where the liquid enters).
When the above selection has been made, the meter exits the SYSTM
submenu and returns to the initial User Program screen. Proceed
directly to the next section to program the PIPE submenu.
Entering Pipe Data
The PIPE submenu is used to program the transducer and pipe data
into the DF868. To use this menu, complete the following steps:
1. At the User (or Channel) Program screen, press [F3] to program the
PIPE submenu.
Initial Setup
2-9
March 2008
Transducer Number
2. Enter the Transducer Number engraved on the head of the
transducer and press [ENT]. If there is no engraved number, you
must complete the steps below. Otherwise, proceed to step 3 on
the next page for a clamp-on transducer, or to step 4 for a wetted
transducer.
a. Assign a number between 91 and 99 to the Special Transducer
and press [ENT]. (The meter will only accept values from 1 to
199.)
b. Use the [F1]-[F3] keys to select the Wedge Type. Three choices
are available: Rayleigh or Shear wave (for clamp-on
transducers) or wetted transducers.
c. Use the [F1]-[F3] keys to select the Frequency of the special
transducer.
d. Enter the special transducer Time Delay (Tw) value supplied by
GE and press [ENT].
If you have selected a special wetted transducer, the meter now
rejoins the standard programming sequence. However, if you have
selected a special clamp-on transducer, the following two additional
prompts appear:
e. Use the numeric keys to enter the Wedge Angle (the angle of
the ultrasonic transmission) in degrees and press [ENT].
Note: In TransFlection mode, you must enter a separate wedge
angle for both the transmit transducer and the receive
transducer.
f. Use the numeric keys to enter the Wedge Soundspeed in ft/sec
or m/sec and press [ENT].
2-10
Initial Setup
March 2008
Pipe Material
3. Use the [F1]-[F4] and [→] keys to select the Pipe Material, as listed
in Table 2-6 below.
Table 2-6: Pipe Materials
Pipe Material Category
Specific Material
Steel
Carbon Steel or Stainless Steel
Iron
Ductile Iron or Cast Iron
Cu - Copper
None
Al - Aluminum
None
Brass
None
CuNi - Copper/Nickel
70% Cu 30% Ni or 90% Cu 10% Ni
Glass
Pyrex, Flint, or Crown
Plastic
Nylon, Polyester, Polypropylene, PVC
(CPVC), Acrylic
Other
Any material
Note: Depending on the pipe material choice, another window may
appear, asking you to specify the specific material. If you
selected “Other,” you will be asked to enter the sound speed.
Pipe OD
4. Enter the known Pipe OD or circumference and press [F1]-[F4] to
select the appropriate units, as shown in Table 2-7 below. Press
[ENT]. (The meter will only accept values from 1/8 to 648 in.)
Note: The first two lines of text in the prompt area depend on the
selection made at the TRANSDUCER NUMBER prompt. The
option bar choices may appear in English or Metric units.
Table 2-7: Available Pipe OD Units
English
Metric
Initial Setup
inch = pipe OD in inches
mm = pipe OD in millimeters
feet = pipe OD in feet
m = pipe OD in meters
in/PI = pipe circumference
in inches
mm/PI = pipe circumference
in millimeters
ft/PI = pipe circumference
in feet
m/PI = pipe circumference
in meters
2-11
March 2008
Pipe Wall
5. Enter the known thickness of the Pipe Wall in the same units used
for the pipe OD, and press [ENT].
If the pipe wall thickness is not available, look up the value in a table
of standard pipe size data.
For wetted transducers, skip to step 7.
Lining
6. Press [F1] if the pipe does not have a Lining, or [F2] if it does have
a lining. If you select YES, complete the steps below.
a. Use the [F1]-[F4] and [→] keys to select the Lining Material.
Options include Tar, Pyrex, Asbestos, Mortar, Rubber, PTFE
and Other. If you choose “Other,” the DF868 then asks you to
enter the lining sound speed.
b. Enter the known Lining Thickness, in the same units used for
the pipe OD, and press [ENT]. Then proceed to step 9.
Path and Axial Length
7. Enter the Path Length of the ultrasonic signal. Press [F1] or [F2] to
select the desired units, and press [ENT].
Note: GE has calculated both the transducer signal path length (P)
and the transducer signal axial length (L), based on the exact
transducer configuration used for the application. These
values are engraved on the flowcell and/or are included in the
documentation supplied with the meter. See Appendix A for
an explanation of how these values are calculated.
8. The next prompt varies, depending on whether you selected
Transit-Time or TransFlection in the ACTIV menu.
Tracking Windows
•
If you selected Transit-Time, the DF868 asks for the Axial
Length. Enter the supplied value. Press [F1] or [F2] to select the
desired units, and press [ENT].
•
If you have selected TransFlection, enter the number of degrees
for the Transducer Angle, and press [ENT]. Skip to step 10.
Note: This step only appears if you have selected Transit-Time.
9. Press [F1] if you do not want Tracking Windows, or [F2] if you want
to enable the windows. (Tracking windows are used to detect the
receive signal when you are unsure of the fluid soundspeed.)
2-12
Initial Setup
March 2008
Fluid Type
10. Use the [F1]-[F4] and [→] keys to select the Fluid Type. The
selections for the fluid type vary, depending on whether:
•
the ENERGY OPTION is ON or OFF
•
the TRACKING WINDOW is enabled or disabled
Refer to Table 2-8 below if ENERGY OPTION is OFF, or to Table 2-9 on
page 2-13 if ENERGY OPTION is ON.
Table 2-8: Fluid Types for ENERGY OFF
Tracking Windows =
NO
Additional Selections
YES
Additional Selections
WATER
Select NORML or SEA and press [ENT].
If NORML is selected, enter the Water
Temperature and press [ENT].
W100
No additional selections
required.
OIL
Select LUBE or CRUDE and press [ENT].
W260
No additional selections
required.
METH
No additional selections required.
OIL
No additional selections
required.
ETH
Enter the Fluid Soundspeed and press [ENT].
OTHER
Enter the Minimum Soundspeed and press [ENT]. Then
enter the Maximum Soundspeed and press [ENT].
LN2
No additional selections required.
FREON
No additional selections required.
OTHER
Enter the Fluid Soundspeed and press [ENT].
Table 2-9: Fluid Types for ENERGY ON
Tracking Windows =
NO
Additional Selections
YES
WATER
Enter the Water Temperature and press
[ENT].
W260
MIXED
Enter the Fluid Soundspeed and press [ENT]. MIXED
Then enter the Percentage of Water and press
Additional Selections
No additional selections
required.
Enter the Percentage of Water
and press [ENT].
[ENT].
OTHER
Enter the Fluid Soundspeed and press [ENT]. OTHER
Initial Setup
Enter the Minimum Soundspeed and press [ENT]. Then
enter the Maximum Soundspeed and press [ENT].
2-13
March 2008
Reynolds Correction
11. Press [F1] to turn Reynolds Correction off, or [F2] to turn it on.
Note: Reynolds Correction should be enabled for most applications.
12. When you enable the Reynolds Correction Factor, you must also
enter the Kinematic Viscosity of your fluid. Use the numeric keys
to enter a value, and press [ENT].
Calibration Factor
13. Enter a value for the flow Calibration Factor and press [ENT]. The
default value is 1.00, but values between 0.50 and 2.00 may be
entered.
14. The menu now varies, depending on whether you have activated
the TransFlection or Transit-Time mode.
•
If you activated the TransFlection mode, the program asks for the
Depth of Reflector. This setting determines where in the pipe the
DF868 looks for the reflected signal. The default value is 50%.
Use the numeric keys to enter a value, and press [ENT].
Note: GE recommends activating the Reynolds Correction Factor
when the Depth of Reflector is set at 50%. You can disable the
Reynolds Correction Factor when the Depth of Reflector is set
at any other value.
•
If you activated the Transit-Time mode, these two steps appear.
a. Use the [F1]-[F4] keys to select the desired Number of
Traverses, the number of times the ultrasonic signal traverses
the pipe, from 1 to 5.
b. The Transducer Spacing prompt displays the spacing of the
transducers, as calculated from the information you have
entered. Record this number and use it to properly space
transducers.
You have completed entering pipe parameters for clamp-on
transducers. Press [ENT] to return to the start of the PIPE submenu, and
[EXIT] to leave the submenu.
2-14
Initial Setup
March 2008
Entering Pipe Data
(cont.)
Table 2-10 below lists the numeric parameters in the PIPE submenu,
with their high and low limits.
Table 2-10: Low and High Limits for PIPE Parameters
Parameter
Low Limit
High Limit
Initial Setup
Wedge Angle
25°
90°
Pipe OD
0.12 in.
300 in.
Pipe Wall
0 in.
4.0 in.
Lining Thickness
0 in.
4.0 in.
Kinematic Viscosity
0.1
10,000 (E-6 ft2/s)
Path Length
0.12 in.
480 in.
Axial Length
0.12 in.
480 in.
2-15
March 2008
Exiting the User Program
After the calibration factor entry has been made, the meter will exit
the PIPE submenu and return to the initial User Program screen.
PROGRAM
PROGRAM
status
ACTIV SYSTM
Start ‰
PIPE
To leave the User Program and
begin taking measurements,
press [EXIT].
I/O
At the conclusion of the initial setup programming sequence, the
following screen appears:
PROGRAM
Start
Do you want to SAVE
current selection appears here
No
Yes
At the User Program screen
shown, press [F1] to return to
measurement mode without
saving the file or press [F2] to
enter the SAVE submenu.
Note: If you press [NO], the DF868 still retains the newly
programmed information in its active memory.
Proceed to Chapter 3, Operation, for instructions on taking
measurements.
2-16
Initial Setup
March 2008
PROG
F1
F2
CH1
CH2
F3
F4
GLOBL
SAVE
(1-Channel)
PROGRAM status
Channel PROGRAM status
Channel PROGRAM
F1
F2
ACTIV
Channel/Site status
F2*
F1**
OFF
TRANS
F3
SYSTM
CHANNEL LABEL
ENERGY OPTION SITE/CHANNEL MESSAGE
F3*
F1
TRNFL
F1
METRC
F1
F2
F3
RAYL
SHEAR
WETTD
AUTO
F2
F3
GAL/S
GAL/M
GAL/H
F4
500k
MNUAL
MGD
ft3/s
F4
F1
F2
F3
F4
F1
BBL/S
BBL/M
BBL/H
BBL/D
MBL/D
F3
F4
A-I/H
F1
A-I/D
F4
1MHz
2MHz
4MHz
Tw
F2
F3
F4
F1
A-F/H
A-F/D
F2
OIL
F3
METH
F3
F4
CRUDE
F1
F2
STEEL
IRON
F3
F4
Cu
Al
F2
F1
BRASS
CuNi
F3
F4
F1
F1
0
MASS FLOW
F2
1
F4
F3
2
3
TOTALIZER UNITS
F1
GAL
MGAL
BBL
F3
ft^3
F1
F4
Mft^3
F2
F3
F4
MBBL
AC-IN
AC-FT
/SEC
0
F2
1
F4
TONS
F2
/MIN
FLUID SOUNDSPEED
GLASS
PLSTC
OTHER
F1
F2
W100
W260
F3
OIL
F4
OTHER
F1
F2
CARBN
SS
F1
F2
DUCT
CAST
F3
2
F3
/HR
F2
1
REYNOLDS CORRECTION
F1
F2
F1
F2
F3
30%Ni
10%Ni
NYLON
POLYE
POLYP
F4
F1
PVC
F3
2
F1
F2
OFF
ON
KINEMATIC VISCOSITY
or TEMP/KV table active
ACRYL
CALIBRATION FACTOR
PIPE OD
F4
3
PIPE OD
F1
F2
feet
F1
F3
F4
in/PI
inch
F3
F4
MMLB
TONS
MASS FLOW ON
inch
F1
F2
1
in/PI
(TRANS) (TRNFL)
F4
DEPTH OF REFLECTOR
ft/PI
NUMBER OF TRAVERSES
PIPE WALL
PATH LENGTH P
F1
0
feet
F3
PIPE WALL
F2
KLB
F2
ft/PI
MASS TOTALS
F1
1(Z)
NO
2(V)
F4
F3
3
4
F1
5
F2
F1
feet
F2
YES
TRANSDUCER SPACING
F4
F3
2
F1
LINING
F2
3
(TRNFL) (TRANS)
LINING MATERIAL
AXIAL LENGTH L
F1
inch
TRANSDUCER ANGLE
Initial Setup
F3
/DAY
inch
LB
MASS FLOW OFF
F2
FLINT
F4
F4
3
F1
PYREX
MINIMUM SOUNDSPEED
MAXIMUM SOUNDSPEED
(Clamp-on Transducers) (Wetted Transducers)
F1
0
TOT DECIMAL DIGITS
F1
F3
MMLB
F2
KLB
MASS FLOW TIME
F2
F1
F1
LB
F3
OTHER
FLUID TYPE
PIPE SOUNDSPEED
VOL DECIMAL DIGITS
F2
FREON
F1
LN2
LUBE
F2
SEA
F4
ETH
PIPE MATERIAL
A-I/S
A-F/M
WATER NORML
TEMPERATURE
WEDGE SOUNDSPEED
(Wetted Type) (Clamp-On Type)
F2
F1
WEDGE ANGLE
ft3/h
A-F/S
WATER
(RAYL/SHEAR)
F3
ft3/m
Mft3/d
A-I/M
F3
(WETTD)
F2
F1
F2
YES
FLUID TYPE
F1
F2
F1
F2
VOLUMETRIC UNITS
F1
F1
NO
FREQUENCY
TOTALIZER OPTION
F1
TRACKING WINDOWS?
SPECIAL TRANSDUCER
WEDGE TYPE
F2
ENG
(TRNFL) (TRANS)
SPEC
SYSTEM UNITS
**Appears only on
2-Channel DF868.
SETUP
TRANSDUCER NUMBER
ON
F1
NOTE: Plain text represents prompt area messages and
boxed text represents option bar choices.
Fx represent function keys to select option bar choices.
F1
I/O
F2
OFF
*Selections are
different depending
on installed options.
F4
PIPE
Figure 2-1: DF868 Initial Setup Menu Map with Energy Option OFF
(2-Channel))
F1
F2
TAR
F2
F3
F4
F1
F2
F3
PYREX
ASBES
MORTR
RUBBR
TEFLN
OTHER
feet
LINING SOUNDSPEED
LINING THICKNESS
2-17
March 2008
PROG
(2-Channel) (1-Channel)
F1
F2
CH1
CH2
F3
F4
GLOBL
SAVE
PROGRAM status
Channel PROGRAM status
F2
Channel/Site status
F1**
OFF
F3
SYSTM
CHANNEL LABEL
F1*
TRANS
OFF
F3
GAL/S
GAL/M
GAL/H
F4
F1
BBL/D
MBL/D
F4
MGD
F2
WEDGE TYPE
VOLUMETRIC UNITS
F2
F1
ft3/s
F3
A-I/S
A-I/M
ft3/m
F4
A-I/H
F1
GAL
1
MGAL
ft^3
Mft^3
1
MASS FLOW ON
MASS FLOW
F1
F2
LB
KLB
/SEC
/MIN
F2
F3
Mft3/d
BBL/S
BBL/M
BBL/H
F2
F3
F4
F1
A-F/M
A-F/H
A-F/D
F1
BBL
F3
F4
500k
1MHz
2MHz
4MHz
Tw
(Wetted Type) (Clamp-On Type)
F2
F3
F4
F1
F2
MBBL
AC-IN
AC-FT
STEEL
IRON
F3
F4
Cu
Al
F1
KBTU
POWER
F2
MMBTU
F2
CARBN
MASS FLOW OFF
TONS
F4
/DAY
F1
0
F3
KW
F2
1
F2
F3
MIXED
OTHER
CuNi
F3
F4
F1
GLASS
PLSTC
OTHER
FLUID TYPE
F1
F2
F3
W260
MIXED
OTHER
F1
F2
PYREX
FLINT
F3
REYNOLDS CORRECTION
SS
F1
F4
F1
F2
TONS
DUCT
CAST
F3
F1
F2
F1
F2
F3
30%Ni
10%Ni
NYLON
POLYE
POLYP
F4
F2
OFF
ON
KINEMATIC VISCOSITY
F1
PVC
F4
ACRYL
CALIBRATION FACTOR
F3
F4
3
inch
ENERGY (TOTAL)
F1
F2
PIPE OD
PIPE OD
3
2
F3
F4
KBTU
MMBTU
KWHr
TONS
F1
F2
F3
F4
F2
feet
F3
F1
F4
in/PI
inch
ft/PI
PIPE WALL
F1
F3
F4
MMLB
TONS
F3
F4
0
1
2
inch
2
3
F2
COOL
HEAT
F1
(TRANS) (TRNFL)
F2
feet
F3
in/PI
F4
DEPTH OF REFLECTOR
ft/PI
NUMBER OF TRAVERSES
PIPE WALL
F1
LINING
1(Z)
F1
F2
feet
NO
F2
YES
F2
F4
F3
3
4
F1
5
LINING MATERIAL
AXIAL LENGTH L
F1
inch
TRANSDUCER ANGLE
F2
2(V)
TRANSDUCER SPACING
3
F1
RTN
Initial Setup
F1
WATER
(Clamp-on Transducers) (Wetted Transducers)
F3
/HR
F2
1
F2
F1
BRASS
(TRNFL) (TRANS)
0
YES
FLUID TYPE
(RAYL/SHEAR)
F4
3
2
MMLB
2
KLB
F2
NO
WEDGE SOUNDSPEED
F3
PATH LENGTH P
F1
TRACKING WINDOWS?
F1
FREQUENCY
F2
F1
PIPE SOUNDSPEED
F1
MASS TOTALS
F1
F2
LB
(TRNFL) (TRANS)
PIPE MATERIAL
F1
F4
F2
1
F3
WETTD
F4
F1
0
F2
SHEAR
(WETTD)
3
F3
MASS FLOW TIME
F1
F2
F1
A-F/S
F3
2
TOT DECIMAL DIGITS
F1
F2
0
ft3/h
F4
F1
RAYL
WEDGE ANGLE
TOTALIZER UNITS
F3
F4
F2
F3
F1
A-I/D
VOL DECIMAL DIGITS
F1
F2
0
NOTE: Plain text represents prompt area messages and
boxed text represents option bar choices.
Fx represent function keys to select option bar choices.
F1
*Selections are
different depending
on installed options.
F2
SETUP
SPEC
SPECIAL TRANSDUCER
ON
**Appears only on
2-Channel DF868.
F1
F1
I/O
TRANSDUCER NUMBER
ENERGY OPTION SITE/CHANNEL MESSAGE
F1
F2
F2*
TRNFL
F4
PIPE
Figure 2-2: DF868 Initial Setup Menu Map with Energy Option ON
F1
ACTIV
F1
F2
TAR
F2
F3
F4
F1
F2
F3
PYREX
ASBES
MORTR
RUBBR
TEFLN
OTHER
feet
LINING SOUNDSPEED
LINING THICKNESS
SPPLY
2-18
Chapter 3
Operation
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Powering Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Using the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Using the Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Using the Console Control Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Setting the Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Taking Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Displaying Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
March 2008
Introduction
See Chapter 1, Installation, and Chapter 2, Initial Setup, to prepare
the DF868 system for operation. When the meter is ready to take
measurements, proceed with this chapter.
!WARNING!
To ensure the safe operation of the DF868, it must be
installed and operated as described in this manual. In
addition, be sure to follow all applicable local safety
codes and regulations for the installation of electrical
equipment.
Powering Up
Because the DF868 does not have an ON/OFF switch, it will power
up as soon as the connected power source is energized. Immediately
upon power up, the DF868 displays the GE logo and the software
version in the left display pane. The DF868 then performs a series of
internal checks and shows the results in the right display pane.
Note: If the DF868 fails any of the internal checks, disconnect the
power and then reboot the unit. If the meter continues to fail
any of the internal checks, contact GE for assistance.
After successfully performing the internal checks, the DF868 begins
taking measurements. The power up display is replaced by a
measurement mode display similar to that shown in Figure 3-1 below.
SITE1 PIPE1
SITE1 PIPE1
Velocity
m/s Volumetric
1038.7
6.95
VEL
VOLUM
+TOTL
SCM/M
-TOTL
Figure 3-1: A Typical Measurement Display
Operation
3-1
March 2008
Using the Display
The DF868 display is divided into a left pane and a right pane. The
two screen panes can be set independently to display any of the
available measurement or diagnostic parameters. The components of
a typical measurement mode screen are shown in Figure 3-2 below.
Pointer
Locator Bar
gSITE
Ch1 no label
Prompt Area
Error Code
CH1
CH2
SUM
DIF
Option Bar
Figure 3-2: Display Screen Components
Both panes of the display screen are continuously updated, but only
one pane at a time may be programmed or changed. To select a pane,
press the corresponding side of the [SCREEN] key on the keypad. The
currently selected screen pane will have function names in the option
bar, while the other screen pane will have a blank option bar. See the
Programming Manual for detailed instructions on using the keypad.
As shown in Figure 3-2 above, each pane of the display screen is
divided into the following three general areas:
•
the locator bar
•
the prompt area
•
the option bar.
The upper portion of the screen pane is called the locator bar. While
the meter is taking measurements, the locator bar displays the name
of the currently selected site file. In addition, the locator bar identifies
the task that is currently being performed and the status of that task.
For example, pressing the [PROG] key on the keypad will cause the
locator bar to display “PROGRAM” and “Start” to indicate that the meter
is ready to be programmed from the start of the User Program.
3-2
Operation
March 2008
Using the Display (cont.)
At various times, one or more of the following four symbols may be
displayed on the far right of the locator bar:
•
‰: This symbol, which is called the pointer, indicates that
additional option bar entries are available. These options can be
accessed by using the [←] and [→] keys.
•
*: A flashing asterisk indicates that the DF868 is currently logging
information.
•
S or SL: This symbol indicates the status of the red [SHIFT] key. “S”
indicates that the [SHIFT] key is activated for the next keystroke
only, while “SL” indicates that the [SHIFT] key is locked.
Note: See the next section for instructions on using the keypad.
•
T: This symbol indicates that the DF868 is currently totalizing
data.
The middle portion of the screen pane is the prompt area. This area
displays data, graphs, and logs in measurement mode and menu
prompts in programming mode. In addition, error code messages, are
displayed in the prompt area.
The lower portion of the screen pane is called the option bar. The
option bar displays the functions assigned to the four keys
immediately below the display screen ([F1]-[F4] for the left pane and
[F5]-[F8] for the right pane). Press a function key to select the function
listed in the option bar immediately above it. If more than four
functions are available, a pointer ( ) appears on the far right of the
locator bar. Press the [←] or [→] keys to display the additional
functions on the option bar.
Operation
3-3
March 2008
Using the Keypad
The DF868 keypad contains 39 keys, which are labeled with their
primary (unshifted) functions. In addition, pressing the red [SHIFT]
key will access the secondary functions assigned to most of the keys.
These functions are printed on the panel just above each key.
Note: Only the [SHIFT] key and the eight [Fx] keys have no shifted
function.
Figure 3-3: The DF868 Keypad
3-4
Operation
March 2008
Using the Console
Control Keys
The DF868 has four console control keys, which are located on the
left side of the keypad (see Figure 3-3 on the previous page). Use
these keys as follows:
Audio Alarm Volume
Use the top console control key to adjust the audio alarm volume.
Discrete presses will incrementally increase the volume of the audio
alarm. Hold the key down for continuous increase. Use the key in
shifted mode to decrease the volume of the audio alarm.
Stopwatch Totalizer
Use the second console control key for the stopwatch totalizer.
Press the key once to start the stopwatch totalizer. Press the key once,
in shifted mode, to stop the stopwatch totalizer.
Display Brightness
Use the third console control key to adjust the display backlight.
Discrete presses of this key will increase the backlight brightness
through settings of Off, Mid and Full. Discrete presses of this key in
shifted mode, will decrease the backlight brightness through settings
of Full, Mid and Off.
Note: The display backlight has an automatic time-off feature.
Display Contrast
Use the bottom console key to adjust the display contrast.
Discrete presses will incrementally increase the display contrast.
Hold the key down for continuous increase. Use the same key, in
shifted mode, to decrease display contrast.
Operation
3-5
March 2008
Setting the Clock
Use the CLOCK submenu to enter the current date and time into the
DF868 internal clock.
1. To enter the GLOBAL menu, press [F3]=GLOBL.
2. To enter the CLOCK submenu, press [F1]=CLOCK.
Setting the Date
3. The first prompt displays the programmed Date.
•
If the displayed date is correct, press [F1] and proceed to step 4.
•
If the displayed date is incorrect, press [F2] to change the date,
and complete the steps below.
a. Enter the current Year and press [ENT]. The allowable range is 0
to 99.
b. Use the [←], [→] and [F1]-[F4] keys to select the current
Month.
c. Enter the current Day and press [ENT]. The allowable range is 1
to the number of days in the current month.
Setting the Time
4. The first prompt displays the programmed Time.
•
If the displayed time is correct, press [F1] and return to the
Global PROGRAM.
•
If the displayed time is incorrect, press [F2] to change the time,
and complete the steps below.
a. Press [F1] = AM or [F2] = PM. Then enter the current Hour and
press [ENT]. The allowable range is 1 to 12.
Note: A time of 12 PM represents Noon and a time of 12 AM
represents Midnight.
b. Enter the current Minutes and press [ENT]. The allowable range
is 0 to 59.
c. Enter the current Seconds and press [ENT]. The allowable range
is 0 to 59.
3-6
Operation
March 2008
Taking Measurements
The DF868 is capable of displaying several different variables in a
variety of formats. However, this manual only discusses the basic
measurement displays in the default screen format.
Note: This section assumes that the left pane of the display screen is
currently active. However, the same instructions apply equally
to the right screen pane, when it is active. Just change the
function keys from [F1]-[F4] to [F5]-[F8].
For a 2-channel DF868, the following initial screen appears
immediately upon completion of the internal checks. As an example,
the display shows the measured velocity in ft/sec for Channel 1.
Ch1 Channel Label
Ch1 Velocity Ft/s
gSITE ‰
6.95
(error codes appear here)
CH1
CH2
SUM
To select a different channel
display option, press [F1]-[F4] (or
[→] and [F1]). See Table 3-1
below for a complete description
of the available options.
DIF
Table 3-1: Channel Display Options
Option Bar Choice
Description
Operation
[F1] = CH1
Channel 1
[F2] = CH2
Channel 2
[F3] = SUM
(Channel 1) + (Channel 2)
[F4] = DIF
(Channel 1) - (Channel 2)
[→] + [F1] = AVE
[(Channel 1) + (Channel 2)]/2
3-7
March 2008
Taking Measurements
(cont.)
The following screen appears after selection of the channel mode
display option for a 2-channel DF868 or immediately after the
internal checks for a 1-channel DF868.
(Ch1) label
(Ch1) Velocity Ft/s
gSITE ‰
6.95
(error codes appear here)
VEL VOLUM +TOTL
Use the [F1]-[F4], [←] and [→]
keys to select the desired display
parameter option. See Table 3-2
below for a complete description
of the available options.
-TOTL
Note: Ch1 (or Ch2), which is shown in parentheses above, appears
only with a 2-Channel DF868.
Table 3-2: Measurement Parameter Options
Option Bar Choice
Description
[F1] = VEL
Flow Velocity
[F2] = VOLUM
Volumetric Flow
[F3] = +TOTL
Forward Totalized Volume Flow
[F4] = -TOTL
Reverse Totalized Volume Flow
[→] + [F1] = TIME
Total Flow Measurement Time
[→] + [F2] = MDOT*
Mass Flow
[→] + [F3] = +MASS*
Forward Totalized Mass Flow
[→] + [F4] = -MASS*
Reverse Totalized Mass Flow
[→] + [→] + [F1] = POWER**
Energy Flow Power
[→] + [→] + [F2] = +ENRG**
Forward Energy Flow
[→] + [→] + [F3] = -ENRG**
Reverse Energy Flow
[→] + [→] + [F4] = DIAG
Diagnostic
* Available only if Mass Flow is enabled
** Available only if Energy Option is enabled
In the SETUP submenu, the Advanced Features option offers a MASS
(Mass Flow) option. The SYSTEM submenu offers an ENERGY OPTION.
If you enable these options, the related options listed in Table 3-2
above are available. However, if you do not enable these options, the
six options indicated do not appear and the DIAG option will appear in
the [F2] position on the second option bar screen.
3-8
Operation
March 2008
Foundation Fieldbus
Communications
Foundation Fieldbus provides a means of communicating with the
flowmeter. This Foundation Fieldbus device supports two Analog
Input (AI) blocks, which can be configured to supply the following
measurements on the network (see Table 3-3 below).
Table 3-3: Available Measurements Using Foundation Fieldbus
Channel 1
Units
Channel 2
Units
Average
Ch1 Velocity
ft/s or m/s* Ch2 Velocity
ft/s or m/s* Avg Velocity
Units
ft/s or m/s*
Ch1 Act Volumetric
VOL_U
Ch2 Act Volumetric
VOL_U
Avg Act Volumetric
VOL_U
Ch1 Std Volumetric
VOL_U
Ch2 Std Volumetric
VOL_U
Avg Std Volumetric
VOL_U
Ch1 Fwd Totals
TOT_U
Ch2 Fwd Totals
TOT_U
Avg Fwd Totals
TOT_U
Ch1 Rev Totals
TOT_U
Ch2 Rev Totals
TOT_U
Avg Rev Totals
TOT_U
Ch1 #Tot Digits**
none
Ch2 #Tot Digits**
none
Avg #Tot Digits**
none
Ch1 Mass Flow
MASS_U
Ch2 Mass Flow
MASS_U
Avg Mass Flow
MASS_U
Ch1 Fwd Mass
Totals
MTOT_U
Ch2 Fwd Mass
Totals
MTOT_U
Avg Fwd Mass
Totals
MTOT_U
Ch1 Rev Mass Totals
MTOT_U
Ch2 Rev Mass
Totals
MTOT_U
Avg Rev Mass Totals
MTOT_U
Ch1 #Mass Tot Digits
none
Ch2 #Mass Tot
Digits
none
Avg #Mass Tot Digits
none
Ch1 Timer
sec
Ch2 Timer
sec
Avg Timer
sec
Ch1 Error Code
none
Ch2 Error Code
none
Avg Error Code
none
Ch1 SSUP
none
Ch2 SSUP
none
Avg SSUP
none
Ch1 SSDN
none
Ch2 SSDN
none
Avg SSDN
none
Ch1 Sound Speed
Ch1 Density***
Ch1 Temperature
Ch1 Pressure
ft/s or m/s* Ch2 Sound Speed
see note
Ch2 Density***
Deg F or C* Ch2 Temperature
PRESS_U
Ch2 Pressure
ft/s or m/s* Avg Sound Speed
ft/s or m/s*
see note
Deg F or C*
PRESS_U
*Metric or English units are determined by the setup of the flowmeter.
**Totalizer digits are available for informational purposes only. Respective totals are automatically scaled by the
Tot Digits value selected in the flowmeter setup.
***If the meter is outputting Mole Weight, the unit is “mw”, otherwise it is the programmed pressure unit.
VOL_U, TOT_U, MASS_U, MTOT_U and PRESS_U are determined by the units chosen for these measurements in the flowmeter setup. See the instrument User's Manual for the setup of these parameters.
Operation
3-9
March 2008
Displaying Data
This section explains how to display measurement data in various
formats. Each of the two display screen panes may be programmed
independently.
Note: The instructions in this section assume that the left display
pane is active. If the right display pane is active, simply
change all [F1]-[F4] designations to [F5]-[F8].
The BIG Format
The BIG format, which is the DF868 default power up format, displays
one measurement in large print. Upon power up, a standard
measurement mode display appears. Press the appropriate side of the
[SCREEN] key to activate the desired pane of the display screen, and
complete the following steps:
site label
Velocity Ft/s
site file X
6.95
(error codes appear here)
VEL VOLUM +TOTL
-TOTL
X
DISPLAY FEATURES
The default power up screen is
already in BIG mode. If a
different display mode is active,
access the Display Menu by
pressing the [DISP] key.
Press [F1] to select the BIG
option. The measurement mode
screen reappears with the display
in the BIG format.
DISPLAY FORMAT
previous selection appears here
BIG
DUAL GRAPH LOG
site label
Velocity Ft/s
site file X
6.95
(error codes appear here)
VEL VOLUM +TOTL
3-10
Use the [F1]-[F4], [←] and [→]
keys to select the desired display
parameter option. See Table 3-4
on the next page for a complete
description of the available
options.
-TOTL
Operation
March 2008
The BIG Format (cont.)
The DUAL Format
Table 3-4: Measurement Parameter Options
Option Bar Choice
Description
[F1] = VEL
Flow Velocity
[F2] = VOLUM
Volumetric Flow
[F3] = +TOTL
Forward Totalized Volume Flow
[F4] = -TOTL
Reverse Totalized Volume Flow
[→] + [F1] = TIME
Total Flow Measurement Time
[→] + [F2] = MDOT
Mass Flow
[→] + [F3] = +MASS
Forward Totalized Mass Flow
[→] + [F4] = -MASS
Reverse Totalized Mass Flow
[→] + [→] + [F1] = DIAG
Diagnostic
The DUAL format displays two measurements simultaneously in
normal size. To select the DUAL format and the measurements to
display in this format, follow the instructions in this section.
Upon power up, a standard measurement mode display appears in BIG
format. Press the appropriate side of the [SCREEN] key to activate the
desired pane of the display screen, and complete the following steps:
1. To access the Display Menu, press the [DISP] key.
2. Press [F2] = DUAL. The measurement mode display reappears and
the display is now in the DUAL format.
3. Use the [F1]-[F4], [←] and [→] keys to select the desired display
parameter option. See Table 3-3 above for a complete description
of the available options.
With the DUAL format display screen active, when a measurement
parameter is selected, the top line of the prompt area will be changed
to show that parameter. The parameter previously displayed at the top
of the display is moved to the bottom of the display, and the previous
bottom parameter is no longer shown.
Operation
3-11
March 2008
Setting the LCD Backlight
Use the BACKL submenu to specify the number of minutes the LCD
display backlight remains on before it is automatically turned off.
Note: For this discussion, it is assumed that the left pane of the
display screen is active. If the right pane is active, replace the
[F1]-[F4] keys designations by the [F5]-[F8] keys.
1. To access the Display Menu, press the [DISP] key.
2. Press [→] and [F2] = BACKL.
3. Use the numeric keys to enter a value from 1 to 60 minutes and
press [ENT]. To keep the backlight on constantly, enter a value of 0
and press [ENT].
The DF868 automatically returns to the previous data display screen
and the programmed backlight timeout interval will begin.
If no entries are made from the keypad before the backlight timeout
interval expires, the backlight will automatically be turned off. At the
next keypad entry, the backlight will be turned on and the specified
timeout interval will begin again.
Activating Sleep Mode
When the display is not used, use the SLEEP submenu to temporarily
suspend LCD display activity, which allows the DF868 to process
data more quickly.
Note: For this discussion, it is assumed that the left pane of the
display screen is active. If the right pane is active, replace the
[F1]-[F4] keys designations by the [F5]-[F8] keys.
1. To access the Display Menu, press the [DISP] key.
2. Press [→] and [F3] = SLEEP. The message “LCD SLEEP MODE -Press
any key . . .” appears.
3. To reactivate the display and return to the previous data screen,
press any key on the keypad. The DF868 automatically returns to
the previous data display screen.
Note: With BIG as the display format, exiting SLEEP mode may not
erase the sleep mode message and the data screen will be
superimposed on the message. If this occurs, enter the DISP
menu and reselect the BIG format to refresh the screen.
3-12
Operation
Chapter 4
Calibration
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Calibrating the Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Calibrating the Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Calibrating the RTD Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
March 2008
Introduction
The DF868 includes six expansion slots for the installation of option
cards. These slots are numbered 1-6, from right to left. In addition,
every DF868 flowmeter includes two built-in analog outputs (A and
B) at terminal block I/O, which is designated as Slot 0. Calibrating the
DF868 analog outputs and inputs is explained in this chapter.
Note: Convention in this manual identifies any expansion slot as
Slot x, where x is a number from 0-6.
The Calibration Menu is accessed by pressing the [CAL] key on the
keypad. Use this menu to calibrate and test the Slot 0 analog outputs,
as well as to calibrate and test any option cards that are installed in the
expansion slots.
The following discussion assumes that the left screen pane is active.
If the right screen pane is active, only the function key designations
change. That is, replace [F1]-[F4] with [F5]-[F8].
Note: While in the Calibration Menu, if there is no keypad activity
for two minutes, the DF868 will automatically reboot and
return to measurement mode.
Calibrating the Analog
Outputs
Every DF868 flowmeter includes two built-in analog outputs (A and
B) at terminal block I/O, which is designated as Slot 0. Additional
analog outputs may be added to the DF868 by installing an Analog
Outputs Option Card in up to 4 of the expansion slots. Each option
card contains four analog outputs, which are designated as A, B, C
and D. Both the zero-point and full-scale values for each output must
be calibrated, with an accuracy of ±5.0 μA (±0.03% of full scale).
Note: The zero point of the analog output may be set for either 0 mA
or 4 mA. However, the calibration procedure always uses the
4 mA point and the meter extrapolates this value to obtain the
0 mA point.
Calibration
4-1
March 2008
Calibrating the Analog
Outputs (cont.)
Prepare for the calibration of Output A by connecting an ammeter as
shown in either Figure 4-1 or Figure 4-2 below.
Terminal Block I/O (Slot 0)
4
1
B
SIG
B
RTN
A
RTN
A
SIG
-
+
Ammeter
Figure 4-1: Ammeter Connection for Slot 0 (Output A)
Terminal Block (Option Card)
8
D
SIG
D
RTN
C
SIG
C
RTN
B
SIG
B
RTN
A
SIG
+
-
Ammeter
A
1 RTN
Figure 4-2: Ammeter Connection for Slots 1-6 (Output A)
Press the [CAL] key to enter the Calibration Program:
4-2
Calibration
March 2008
Accessing the Calibration
Menu
1. Press the [CAL] key to enter the Calibration Menu.
2. Press [Fx] to calibrate the desired slot. (the option bar will include a
slot listing for each installed option card.)
3. Press [Fx] to select the desired output.
IMPORTANT: The procedure for calibrating all the outputs is the
same. However when calibrating an output, be sure to
connect the ammeter to the appropriate pins on the
terminal block.
Calibrating the Low End of
the Output Range
1. Press [F1] to calibrate the low end of the output range.
2. Press [F1] or [F2] to adjust the ammeter reading UP or DOWN, until
a 4 mA reading is achieved. If you press [F3], Numer, enter a
numeric value for the calibration point and press [ENT].
3. Press [F4] to STORE the setting, or press [→] and [F1] to ABORT the
calibration.
Note: If the ammeter reading cannot be adjusted within 5.0 μA of the
4 mA setting, contact the factory for assistance.
Calibrating the High End
of the Output Range
1. Press [F2] to calibrate the high end of the output range.
2. Press [F1] or [F2] to adjust the ammeter reading UP or DOWN, until
a 20 mA reading is achieved. If you press [F3], Numer, enter a
numeric value for the calibration point and press [ENT].
3. Press [F4] to STORE the setting, or press [→] and [F1] to ABORT the
calibration.
Note: If the ammeter reading cannot be adjusted within 5.0 μA of the
20 mA setting, contact the factory for assistance.
Calibration
4-3
March 2008
Testing the Analog Output
Linearity
1. Press [F3] to TEST the linearity of the currently selected analog
output.
2. Check the ammeter reading at the 50% output level.
3. Then, enter a different output level (0-100%) and press [ENT].
4. Check the ammeter reading at this setting. Press [ENT] when done.
Table 4-1 below lists the expected ammeter readings at various
% Full Scale settings, for both 4-20 mA and 0-20 mA scales. Refer to
this table to verify the accuracy of the ammeter readings taken above.
Table 4-1: Expected Ammeter Readings
% Full Scale
4-20 mA Scale*
0-20 mA Scale*
0%
4.000
0.000
10%
5.600
2.000
20%
7.200
4.000
30%
8.800
6.000
40%
10.400
8.000
50%
12.000
10.000
60%
13.600
12.000
70%
15.200
14.000
80%
16.800
16.000
90%
18.400
18.000
100%
20.000
20.000
* All ammeter readings should be ±0.005 mA
If the linearity test readings are not within ±5 μA of the values listed
in Table 1-1 above, check the accuracy and wiring of the ammeter.
Then, repeat the low and high end calibrations. If the analog output
still does not pass the linearity test, contact GE for assistance.
4-4
Calibration
March 2008
Calibrating the Analog
Inputs
Analog inputs may be added to the DF868 flowmeter by installing an
Analog Inputs Option Card in up to 4 expansion slots. Each option
card contains two analog inputs, which are designated as A and B.
Each of the inputs, which may be either a 0/4-20 mA input or an RTD
input, must be calibrated at both the zero-point and full-scale values.
Calibration of the analog inputs requires the use of a calibrated
current source. If an independent calibrated current source is not
available, one of the Slot 0 analog outputs may be used for the
calibration. During the analog input calibration, the Slot 0 analog
output will supply the low reference, high reference, 4 mA and
20 mA signals at the appropriate times.
Note: If a Slot 0 analog output is used to calibrate the analog inputs,
make sure that the Slot 0 analog output calibration procedure
has already been completed.
Connect the Slot 0 analog outputs (or independent calibrated current
sources) to the analog inputs on the option card, as shown in Figure
4-3 below.
Analog Input Option Card
8
B
RTN
B
INLO
B
INHI
Terminal Block I/O (Slot 0)
1
4
B
+24V
B
RTN
B
SIG
A
RTN
A
SIG
A
RTN
A
INLO
A
INHI
A
1 +24V
Figure 4-3: Analog Input Calibration Connections
Calibration
4-5
March 2008
Calibrating the Analog
Inputs (cont.)
For this discussion, assume that the option card has been installed in
Slot x.
Note: The zero point of the analog input may be set for either 0 mA
or 4 mA. However, the calibration procedure always uses the
4 mA point and the meter extrapolates this value to obtain the
0 mA point.
Accessing the Calibration
Menu
1. Press the [CAL] key to enter the Calibration Menu.
2. Press [Fx] to calibrate the desired slot. (The option bar will include
a slot listing for each installed option card.)
3. Press [Fx] to select the desired input.
The procedure for calibrating Input A is identical to that for calibrating
Input B. However, when calibrating Input B, be sure a calibrated
current source is connected to the appropriate pins on the terminal
block. See Figure 4-3 on the previous page for the correct pin
numbers.
Note: To calibrate an RTD input card, proceed to the next section.
4. Press [F1]-[F4] to select the reference point to be calibrated, and
then continue as follows.
4-6
•
If you selected [F1] (aLOW), proceed to the aLOW Option below.
•
If you selected [F2] (aHIGH), proceed to the aHIGH Option below.
•
If you selected [F3] (4 mA), proceed to the 4 mA Option on the
next page.
•
If you selected [F4] (20 mA), proceed to the 20 mA Option on the
next page.
Calibration
March 2008
aLOW Option = [F1]
1. Enter the low reference value and press the [ENT] key.
2. Press [F1] to store the current low reference value or press [F2] to
cancel the entry. In either case, the ANALOG INPUT prompt will
reappear.
3. Press [F2] to proceed to the next section.
aHIGH Option = [F2]
1. Enter the high reference value and press the [ENT] key.
2. Press [F1] to store the current high reference value or press [F2] to
cancel the entry. In either case, the ANALOG INPUT prompt will
reappear.
3. Press [F2] to proceed to the next section.
4 mA Option = [F3]
1. Connect the 4 mA current source to the currently selected analog
input, as shown in Figure 4-3 on page 4-5.
2. Press [F1] to store the current 4 mA value or press [F2] to cancel the
entry. In either case, the ANALOG INPUT prompt reappears.
3. Press [F4] to proceed to the next section.
20 mA Option = [F4]
1. Connect the 20 mA current source to the currently selected analog
input, as shown in Figure 4-3 on page 4-5.
2. Press [F1] to store the current 20 mA value or press [F2] to cancel
the entry. In either case, the ANALOG INPUT prompt reappears.
3. Press [F4] to proceed to the next section.
Leaving the Calibration
Menu
Calibration
To leave the Calibration Menu, press [F4] (EXIT) twice.
4-7
March 2008
Calibrating the RTD
Inputs
Calibrating an RTD option card involves a different procedure than
for other analog input cards. However, you access the card in the
same manner as other cards.
Accessing the Calibration
Menu
1. Press the [CAL] key to enter the Calibration Menu.
2. Press [Fx] to calibrate the desired slot. (The option bar will include
a slot listing for each installed option card.)
For an RTD option card, the following screen appears:
CALIBRATION
Slot x Inputs
current input selected
Press [F1] to select the Probe
method of calibration, or [F2] to
select the Numer method.
RTD CALIBRAT
last option selected
Probe Numer
The Probe option allows the meter to calculate the temperature vs.
resistance curve, based on input from the RTD in a temperature bath
or from an RTD calibrator. The Numer option requires the user to
calculate and input the curve values numerically.
IMPORTANT: Use only one option for RTD calibration. Do not try to
calibrate with both options.
Calibrating an RTD option card involves a slightly different
procedure than for other analog input cards. However, you access the
card in the same manner.
Probe Option = [F1]
1. Press [F1] to select Input A, or [F2] to select Input B.
Set Point Temperature
2. Press [F1] to enter the set point temperature. This temperature
should be at the low end of your expected operating range.
3. Enter the desired set point temperature, and press [ENT].
4. Press [F1] to STORE the entered temperature, or [F2] to ABORT the
calibration. In either case, the screen returns to the ANALOG INPUT
prompt.
4-8
Calibration
March 2008
Slope Point Temperature
5. Press [F2] to enter the slope point temperature. This temperature
should be as far from your set point as your temperature bath will
allow, within the range -100° to +350°C.
6. Enter the desired slope point temperature, and press [ENT].
7. Press [F1] to STORE the entered temperature, or [F2] to ABORT the
calibration. In either case, the screen returns to the ANALOG INPUT
prompt.
Numer Option = [F2]
The Numer option requires the user to calculate the temperature vs.
resistance information. To do this, the user must first collect data
using the RTD option in the PRINT menu. The RTD option allows you
to know what point value the DF868 is reading at a given
temperature. With this information, the Numer option enables you to
enter the Set Temperature and the Slope of the RTD input in points/
degree, allowing absolute control over RTD calibration. Before
attempting this step, obtain values at your set point and slope point.
1. Press [F1] to select Input A, or [F2] to select Input B.
Set Number
2. Press [F1] to enter the set number.
3. Enter the set point temperature, and press [ENT].
4. The program then asks for the set point number. Enter the points
measured at the set temperature, and press [ENT].
Slope Number
5. Press [F2] to enter the slope number. Calculate the slope number
with the formula:
Points – Set Points----------------------------------------------------------Slope = Slope
Slope Temp – Set Temp
6. Enter the RTD slope number and press [ENT].
Calibration
4-9
Appendix A
Measuring P and L Dimensions
Measuring P and L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
March 2008
Measuring P and L
If you are using wetted transducers, the DF868 requires you to enter
the path length (P) and the axial dimension (L). P is the transducer
face-to-face distance, and L is the axial projection of P in the flow
stream.
To determine L, physically measure the distance between the center
of the transducer ports at the inside wall as shown in Figure A-1
below, if possible. If not, consult the factory.
Figure A-1: Top View of 180° Transducer Installation
To determine P, you need the following data:
Measuring P and L Dimensions
•
the pipe inside diameter (ID)
•
the wall thickness (WT)
•
the installed pipe coupling length (CL)
•
the transducers face depth (FD)
•
the mounting angle (MA)
A-1
March 2008
Measuring P and L (cont.) Use Figure A-2 below to properly measure the coupling length.
Typically, the transducer face is positioned just outside the inside
diameter (ID) of the pipe, or slightly retracted inside the coupling.
Figure A-2: Determining the Pipe Coupling Length
Use the following formula to determine the P dimension:
[ ID + 2 ( WT ) ]
P = ----------------------------------- + 2 ( CL – FD )
cos ( MA )
For example, if:
•
inside diameter (ID) = 48”
•
wall thickness (WT) = 3/8”
•
installed coupling length (CL) = 2.0”
•
transducer face depth (FD) = 1.75”
•
mounting angle (MA) = 45°
Then, the P dimension would be:
48 + 2 ( 0.375 ) ] + 2 ( 2.0 – 1.75 ) = 69.4″
P = [-------------------------------------cos ( 45° )
A-2
Measuring P and L Dimensions
GE
Sensing
DECLARATION
OF
CONFORMITY
Panametrics Limited
Shannon Industrial Estate
Shannon, County Clare
Ireland
We,
declare under our sole responsibility that the
DigitalFlow™ DF868 Liquid Ultrasonic Flowmeter
DigitalFlow™ GC868 Clamp-On Gas Ultrasonic Flowmeter
DigitalFlow™ GF868 Flare Gas Mass Ultrasonic Flowmeter
DigitalFlow™ GM868 General-Purpose Gas Ultrasonic Flowmeter
DigitalFlow™ GS868 Steam Ultrasonic Mass Flowmeter
to which this declaration relates, are in conformity with the following standards:
• EN 61326:1998, Class A, Annex A, Continuous Unmonitored Operation
• EN 61010-1:1993 + A2:1995, Overvoltage Category II, Pollution Degree 2
following the provisions of the 89/336/EEC EMC Directive and the 73/23/EEC Low Voltage Directive.
The units listed above and any transducers supplied with them (spoolpieces are addressed under a separate
declaration of conformity) do not bear CE marking for the Pressure Equipment Directive, as they are supplied in
accordance with Article 3, Section 3 (sound engineering practices and codes of good workmanship) of the Pressure
Equipment Directive 97/23/EC for DN<25.
Shannon - June 1, 2002
Mr. James Gibson
GENERAL MANAGER
TÜV
TÜV ESSEN
ISO 9001
U.S.
CERT-DOC-H4
August 2004
USA
1100 Technology Park Drive
Billerica, MA 01821-4111
Web: www.gesensing.com
Ireland
Sensing House
Shannon Free Zone East
Shannon, County Clare
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