ANALYTICAL FLOW TECHNOLOGIES DENSITRAK D625 User manual

DENSITRAK® D625 OPERATION
MANUAL
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INTRODUCTION
We sincerely THANK YOU for your purchase of an ANALYTICAL FLOW TECHNOLOGIES
DENSITRAK® D625 Density Meter (Henceforth, D625).
This manual is intended for the personnel responsible for the installation, operation and/or
maintenance of the ANALYTICAL FLOW TECHNOLOGIES D625 density meter.
This manual explains the following topics:
Safety and Precautions
Brief History of ANALYTICAL FLOW TECHNOLOGIES Principle of Operation
Specifications
Features and Benefits
Installation
Operation
Maintenance
Field Density Output Correction (Error offset) Troubleshooting
Carefully read this manual prior to installation and operation of this meter to ensure safe and
proper operation.
Do NOT discard this manual - Always keep it in a place where you can access it for quick reference.
If you lose or require additional copies of this manual refer to the ANALYTICAL FLOW
TECHNOLOGIES website (www.densitrak.nt-rt.ru)for a PDF version.
Carefully read ALL Safety Precautions and Important Notes prior to installation and operation of
this meter.
THE ANALYTICAL FLOW TECHNOLOGIES D625 MODEL DENSITY METER CAN BE UTILIZED IN
MANY VARIOUS FLUID DENSITY MONITORING APPLICATION, SUCH AS:
Water and Wastewater Treatment
Petroleum Refinery and Pipeline Applications
Fluid Product Blending & Interface Detection
Pulp & Paper Manufacturing
Chemical Processing
Power Generation
…and many more

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IMPORTANT SAFETY INFORMATION
SAFETY CAUTIONS
SYSTEM PRESSURE: Do NOT expose meter to pressure greater than the meter and/or
flange rating –whichever is lowest.
Do NOT pressure test meter above 1.5 x operating pressure.
MATERIAL COMPATIBILITY: Do NOT expose the meter wetted parts to fluids
(chemicals) that are NOT COMPATIBLE with the materials of construction.
Consult ANALYTICAL FLOW TECHNOLOGIES engineers with any questions regarding
material compatibility.
EXPLOSION HAZARD: The cables and fittings provided with this meter are not certified
for use in hazardous or explosive environments unless specifically noted on the meter
and electronics enclosure.
HEAVY OBJECT: Handle the meter with care and request assistance when lifting,
moving or installing.
Dropping the meter can cause injuries and/or equipment failure.
ELECTRICAL HAZARD: Remove power source prior to installation or maintenance of the
density meter.
Ensure that all electrical connections and or maintenance are performed by properly
qualified personnel.
ENVIRONMENT: DO NOT operate meter in situations where continuous line vibration is
greater than 0.5g.
IMPORTANT NOTES
INSTALLATION: Do not install the meter in situations where:
Meter is exposed to excessive vibration
Meter can become submerged in water or other fluids
Meter can come in contact with corrosive materials
Meter is hard to access for periodic maintenance
PROCESS FLUIDS: All process fluids must be compatible with the wetted parts of the
meter.
TRANSPORTATION: NEVER transport the meter with hazardous fluids still entrapped in
the meter or process connections.
Please notify ANALYTICAL FLOW TECHNOLOGIES of the process fluids utilized in the
meter prior to returning to the factory for repair or service.
A CLEANING FEE applies to ALL METERS returned to ANALYTICAL FLOW
TECHNOLOGIES that have not been thoroughly cleaned prior to return.

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TABLE OF CONTENTS
Introduction................................................................................................................................................................................ 3
Important Safety Information ............................................................................................................................................ 4
Table of Figures................................................................................................................................................................... 7
Table of Equations.............................................................................................................................................................. 7
History of ANALYTICAL FLOW TECHNOLOGIES........................................................................................................ 8
Theory of Operation ............................................................................................................................................................... 8
Density Equations............................................................................................................................................................... 9
Product Specifications.........................................................................................................................................................10
Benefits and Features ..........................................................................................................................................................11
Unpacking.................................................................................................................................................................................11
Installation ...............................................................................................................................................................................12
Installation Planning .......................................................................................................................................................12
Installation Dimensions .................................................................................................................................................13
TOP-VIEW DIMENSIONS...........................................................................................................................................13
FRONT-VIEW DIMENSIONS.....................................................................................................................................13
SIDE-VIEW DIMENSIONS .........................................................................................................................................14
Meter Assembly.................................................................................................................................................................15
D625 Meter –Electrical Connections .......................................................................................................................16
Model D625 EX-PROOF ENCLOSURE ElectrICAL CONNECTIONS ...........................................................16
D625 Meter –Electrical Connections .......................................................................................................................20
Meter –Process Flow Installation..............................................................................................................................22
Inline Setup Installation............................................................................................................................................23
ANSI 15O#/300#/600# remote mount SCOOPED FLANGE INSTALLATION.....................................24
ANSI 15O#/300#/600# SCOOPED FLANGE INSTALLATION ...................................................................25
ORIFICE / BYPASS D625 Installation ..................................................................................................................26
Other Installation MEthods......................................................................................................................................27
Meter Maintenance ...............................................................................................................................................................28
Meter Cleaning Procedure ............................................................................................................................................28
Density Output –Field Calibration.................................................................................................................................30
When to field calibrate…................................................................................................................................................30
Field Calibration Example:............................................................................................................................................30
Field Calibration Work Table.......................................................................................................................................31
Meter Troubleshooting .......................................................................................................................................................32

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Contact Information .............................................................................................................................................................32
APPENDIX I: CONVERSION FACTORS..........................................................................................................................33
Density ..................................................................................................................................................................................33
Pressure................................................................................................................................................................................33
Flow Rate..............................................................................................................................................................................33
Temperature.......................................................................................................................................................................34
APPENDIX II –aft DENSITRAK DOCUMENTS ............................................................................................................35
AFT CUSTOMER INTERFACE BOARD PINOUT.....................................................................................................35
AFT DENSITRAK D625-XX-XX-01 ELECTRONICS EXPLODED VIEW ..........................................................36
AFT DENSITRAK D625-XX-XX-03 ELECTRONICS EXPLODED VIEW ..........................................................37
AFT DENSITRAK D625-00-00-04 ENCLOSURE EXPLODED VIEW...............................................................38

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TABLE OF FIGURES
Figure 1: CUTAWAY VIEW - DENSITRAK D625 Vibrating Tube DensitOMeter........................................... 8
Figure 2: DENSITRAK D625 –TOP VIEW - DIMENSIONS....................................................................................13
Figure 3: DENSITRAK D625 –FRONT VIEW - DIMENSIONS..............................................................................14
Figure 4: DENSITRAK D625 –SIDE VIEW - DIMENSIONS...................................................................................14
Figure 5: IN-LINE DENSITY METER INSTALLATION ............................................................................................23
Figure 6: DENSITRAK D625 REMOVAL.......................................................................................................................23
Figure 7: SCOOPED FLANGE ASSEMBLY .....................................................................................................................24
Figure 8: CUTAWAY VIEW OF SCOOP ORIENTATION INSIDE THE MAIN PIPELINE ..............................24
Figure 9: SCOOP FLANGE FLOW RATE VERSUS MAIN PIPELINE FLOW VELOCITY................................25
Figure 10: ANSI SCOOP FLANGE TO D625 MOUNTING ASSEMBLY................................................................25
Figure 11: TYPICAL DENSITRAK D625 “BYPASS INSTALLATION” SETUP..................................................26
Figure 12: customer interface circuit board pin-out ................................ Error! Bookmark not defined.
Figure 13: aft electronics exploded view........................................................ Error! Bookmark not defined.
TABLE OF EQUATIONS
Equation 1: Uncorrected (Periodic) Density Equation ........................................................................................... 9
Equation 2: Temperature Corrected Density Equation.......................................................................................... 9
Equation 3: Pressure Corrected Density Equation................................................................................................... 9
Equation 4: K0Density Offset Equation.......................................................................................................................30

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HISTORY OF ANALYTICAL FLOW TECHNOLOGIES
The DENSITRAK® D625 liquid density meter was ORIGINALLY designed by Calibron Systems, Inc.
of Scottsdale, AZ. Calibron Systems, Inc. was eventually acquired by Honeywell Enraf. Honeywell
Enraf licensed the exclusive rights for manufacture and service of the DENSITRAK® meter to
Analytical Flow Technologies in March 2010.
Analytical Flow Technologies is owned and operated by Paul Heinritz, who has a long relationship
with the DENSITRAK® Densitometer in which he ran the DENSITRAK® product line for Calibron
Systems, Inc. and briefly for Honeywell Enraf prior to the DENSITRAK® production move to Pune,
India. Analytical Flow Technologies emphasizes American-Made products, along with high quality
customer service and support to differentiate itself from the large corporation alternatives.
THEORY OF OPERATION
The liquid density meter uses the spring mass principle for measuring the fluid density. A portion of
the measurement tube is energized (transmit sensor) to vibrate and to maintain its natural
resonant frequency by using an electrical feedback driving system. A change in the vibrating mass,
(as a result of change in the fluid density) shifts the resonant frequency which is interpreted by the
receive sensor. The signal is then output to the density processing unit via the rear mount electrical
connector.
An ANALYTICAL FLOW TECHNOLOGIES density processing unit uses algorithms that incorporate
temperature (integrated into the meter), pressure (via an external pressure transmitter 4-20mA
output) and the shift in frequency to determine the density of the measured fluid.
FIGURE 1: CUTAWAY VIEW - DENSITRAK D625 VIBRATING TUBE DENSITOMETER

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DENSITY EQUATIONS
A simple definition for Density (for a homogeneous object) is the mass of the object divided by the
volume of the object. Thus, common units of fluid density are grams per cubic centimeter,
kilograms per cubic meter, and pounds per cubic foot.
The hydrometer is probably the most common device used to measure fluid density in which it
measures the volume displaced by an object of known mass. The pycnometer is another
instrument used for measuring fluid density. However, these devices are mainly restricted for use
in laboratories. Another instrument used to determine the density of a liquid or a gas is the
oscillating U-tube digital density meter. The U-tube digital density meter is installed in a process
flow system where it continuously monitors “real-time” fluid density.
The oscillating U-tube is a method to determine the density of liquids based on an electronic
measurement of the frequency of oscillation. The density value is calculated by incorporating
frequency of oscillation, fluid temperature and pressure. The equations shown below are utilized
by the density processor or flow computer to determine the density of the fluid flowing through the
meter.
EQUATION 1: UNCORRECTED (PERIODIC) DENSITY EQUATION
  󰇛 󰇜  󰇛 󰇜
DU= Density of the fluid based on the periodic time (frequency of oscillation) of the meter. It is
UNCORRECTED for Temperature and Pressure. Unit = grams per cubic centimeter [gr/cm3]
T = Periodic Time (frequency of Oscillation) of the density meter. Unit = microseconds [µs]
K0, K1, K2= Density Coefficients. These coefficients vary for each meter and are determined at
the factory during the meter calibration process. Refer to the Calibration Certificate included
with your meter.
EQUATION 2: TEMPERATURE CORRECTED DENSITY EQUATION
    󰇟󰇛  󰇜󰇠 󰇛  󰇜    󰇛󰇜
DU= Uncorrected Density, [gr/cm3]
DT= Temperature Corrected Density , [gr/cm3]
KTv, KT0, KT1 = Temperature Correction Density Coefficients –included with Calibration
Certificate.
TF= Live fluid temperature in degrees Fahrenheit [°F]
TC= Reference temperature in degrees Fahrenheit [°F]
EQUATION 3: PRESSURE CORRECTED DENSITY EQUATION
               
DPT = Pressure & Temperature corrected Density, [gr/cm3]
DT= Temperature Corrected Density , [gr/cm3]
KPv, KP0, KP1 = Pressure Correction Density Coefficients –included with Calibration Certificate.
P = Live pressure in Pounds per square inch [PSIG]

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PRODUCT SPECIFICATIONS
ANALYTICAL FLOW TECHNOLOGIES D625 Product Specifications Chart
Density Operating Range
0.40 –2.00 grams/cubic centimeter [gr/cm3]
Maximum Density Span
0.70 gr/cm3(range can be extended with reduction in accuracy)
Density Resolution
0.0001 gr/cm3
Meter Accuracy
0.0001 gr/cm3
Repeatability
Better than 0.01%
Operating Temperature
Standard: 50°F to 140°F [10°C - 60°C]
Optional: 32°F to 203°F [0°C - 95°C]
MAX Temp. Differential
ΔTmax = 90°F [50°C]
Operating Pressure
Range: 0 to 2,220 PSI [0 –149 bar]
ANSI Flanged same as flange rating at 100°F
Hydrostatic Test: 1.5 times line pressure
Flow Rate
MIN: .25 Gallons per Minute (GPM)
MAX: 30 GPM
Frequency Signal Output
Nominal 0.30 kHz to 3.0 kHz
Temperature Sensor
3 Wire 100Ω Pt RTD
Power Requirement
VOLTAGE: 24 VDC
CURRENT: 30 –50 mA nom.
Materials of Construction
Standard Wetted Parts: 316/316L Stainless Steel,
HASTELLOY® C276
Non-Wetted Parts: 304 Stainless Steel
Electrical Classification
Designed to meet NEC/CSA Class 1, Div. 1, Group C & D, CE Mark
Housing Approved: CSA, FM, EExd, UL
RoHS Compliant
Physical Dimensions
SEE APPENDIX DRAWING
Shipping Weight: Approx. 16 pounds