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Within the United States, Thermo’s service department is your single-point contact for all Thermo equipment service needs. If at any time you are not sure what to do, you have a question about using the product, or you have a service or support request, call Thermo at 713.272.0404.
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Thermo Electron Corporation (Thermo) makes every effort to ensure the accuracy and completeness of this manual. However, we cannot be responsible for errors, omissions, or any loss of data resulting from errors or omissions. Thermo reserves the right to make changes to the manual or improvement to the product at any time without notice.
Its transducers can be mounted to a pipe within a matter of minutes, and flow measurements may be made without interrupting the flow or modifying pipe work. The DCT7088 can be configured using an integral keypad for entering variables such as pipe size, pipe material, wall thickness, and fluid type (refer to Section 3, page 8).
..Theory of operation 1.2-B: F IGURE ROFILES Transit Time Accuracy Noninvasive ultrasonic measurements are subject to a variety of effects that can influence measurement accuracy. All ultrasonic instruments are velocity measuring devices and only infer volumetric flow from the operator-entered parameter of pipe inside diameter (ID).
Ordering The table below describes ordering information for a standard DCT7088 flowmeter as well as available options. MODEL NUMBER Series: Digital Correlation Transit Time Flowmeters DCT7088 = DCT7088, RS232 digital interface with UltraScan signal analysis and configuration program Battery Duration...
External Features Components Description Printer port: Provides output for optional external thermal printer. Connects to special cable which has 3-pin round connector on flowmeter end and DB9 connector on printer end. ON/OFF keys Battery Low light: Activates after approximately 7 or 14 hours of operation (depending on battery type).
Breakout Box Components Components Description AC power cable DC power output cable DC power input connector: Connects DC power output cable to flowmeter. 4-20 mA output terminals Printer charger cable RS232 serial port Breakout box interface connector: Provides connections for DC power input from battery charger/AC adapter, for DC output cable for charging battery, for RS232...
2. W IRING THE URRENT The 4-20 mA current loop module has an input terminal and an output terminal. Both are indicated on a label on the inside of the flowmeter door. The current loop output is rated for a loop resistance of up to 1 k ohms and is isolated for up to 5 kV when loop-powered.
3. C & O ONFIGURING PERATING THE LOWMETER The Keypad & Display The keypad provides access to the microprocessor for flowmeter configuration. During operation, the instrument’s 40-character LCD indicates flow rate and totalizer values. 3.1.1 Components Components Description Numeric keys: 0 through 9 and decimal (.). Arrow keys: For scrolling up, down, left, right.
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..Direct menu access The address must be entered while the M is displayed (within approximately 4 seconds). If the M is no longer displayed, press MENU again followed by the 2-digit address. Menu Type Display Menu Menu Type Display Menu Primary Flow/Net Totalizer...
Using the Arrow Keys to Access Menus Another method of accessing the flowmeter’s menus is to use the LEFT or RIGHT ARROW keys to scroll through the menu structure. Menus are organized into 3 basic levels: 1) Main menu, 2) submenus, and 3) primary displays, setup menus, diagnostic menus.
..Flowmeter configuration using setup menus To configure the flowmeter: 1. Access the setup menus individually by pressing MENU and entering the 2-digit address OR by scrolling through the submenus and selecting the desired setup menu. 2. a. If the setup menu requires a numeric entry, use the numeric keys to enter the value and press ENTER to accept the value.
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..Quick setup configuration PIPE setup menu continued: 3.5-A ( ) & 3.5-B ( IGURES LEFT RIGHT b. Select the Pipe ID setup menu (12). Enter the pipe ID value, and press ENTER (Figure 3.5-C, below). c. Select the Pipe Material setup menu (13). Press the UP and DOWN ARROWS to scroll through the available options (Figure 3.5-D, below).
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..Quick setup configuration 5. Within the Transducer submenu: a. Access the Transducer Type setup menu (23). Currently, the only selection available is STANDARD, which MUST be selected for all applications using clamp-on transducers, including high temperature transducers (Figure 3.5-H, below). b.
Primary Displays The primary displays are for viewing only and cannot be configured. Primary displays include displayed values for flow rate, totalizers, velocity, signal strength, or low signal cutoff (menus 00 through 04). 3.6.1 Flow/Net Totalizer (00) The Flow/Net Totalizer (Figure 3.6-A, below) is the standard display used under normal operating condi- tions.
Additional Setup Menus Within the PIPE Submenu *Not included in the Quick Setup configuration Following are setup menus not included in the Quick Setup configuration detailed in Section 3.5 (page 11). Setup menus are used primarily to enter configuration data or to view the flowmeter’s current configuration settings.
..Additional setup menus within the LINER submenu 3.8-A ( ) & 3.8-B ( IGURES LEFT RIGHT Additional Setup Menus Within the FLUID Submenu *Not included in the Quick Setup configuration 1. Fluid Sound Speed setup menu (21): This menu can only be configured if you selected OTHER as the fluid type in Menu 20.
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..Additional setup menus within the FLOW submenu 3.10-A 3.10-C ( IGURES THROUGH LEFT TO RIGHT TOP TO BOTTOM 3. Low Flow Cutoff setup menu (34): When a zero flow condition occurs (for example, as the result of a pump being shut off), internal sloshing, check valve leakage, and other fluid movement can prevent the flowmeter from reading total zero.
..Additional setup menus within the FLOW submenu 3.10-F ( ) & 3.10-G ( IGURES LEFT RIGHT 3.11 Additional Setup Menus Within the TOTAL Submenu *Not included in the Quick Setup configuration 1. Totalizer Units setup menu (36): The flow unit selected for the totalizer display may be different from the flow unit selected for the flow rate display (Figure 3.11-A, below).
..Additional setup menus within the TOTAL submenu 3.11-E ( ) & 3.11-F ( IGURES LEFT RIGHT 3.12 Additional Setup Menus Within the OPTIONS Submenu *Not included in the Quick Setup configuration The OPTIONS submenu contains setup menus for several miscellaneous functions. 1.
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..Additional setup menus within the OPTIONS submenu 3. RS232 Configuration setup menu (46): Use this menu to configure the RS232 port which allows the ® flowmeter to connect to an IBM -compatible PC using the UltraScan (refer to the UltraScan manual) or D-Link (refer to Appendix C, page 69) utilities (Figure 3.12-C, below).
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..Additional setup menus within the OPTIONS submenu 3.12-E 3.12-I ( IGURES THROUGH LEFT TO RIGHT TOP TO BOTTOM 5. Change Scale Factor Password setup menu (48): Use this menu to change the scale factor password which is designed to protect the scale factor from unauthorized or accidental changes. The flowmeter ships from the factory with the scale factor password disabled.
..Additional setup menus within the OPTIONS submenu 6. Unit ID (identification) Number setup menu (49): This number is determined by the operator to identify the specific instrument or site. Any whole number between 1 and 60,000 may be entered (Figure 3.12-N, below).
..Additional setup menus within the CALIBR submenu Zero flow set method continued After the instrument is properly zeroed, it should display a stable reading well below 0.05 ft/s (0.015 m/s) under zero flow conditions with the low flow cutoff disabled. Prior to performing a zero set calibration, verify the following: 1.
..Additional setup menus within the CALIBR submenu Manual zero set method continued 3.13-D ( ) & 3.13-E ( IGURES LEFT RIGHT 3.13.2 Scale Factor Calibration After setting and verifying the instrument’s zero point, you can set a scale factor to adjust the measured flow;...
..Other CALIBR submenu options 2. Date and Time setup menu (54): Use this menu to set the date and time in the flowmeter’s internal clock. The time is expressed in military time (24-hour format), and the date is in the month-day-year format (Figure 3.13-I, below).
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..Additional setup menus within the 4-20 mA submenu 4. Press ENTER. 5. Access Menu 58 again. 6. Press the DOWN ARROW to scroll to the 20 mA Calibrate screen (Figure 3.14-C, below). 7. Repeat step 3 for entering the 20 mA set point. 8.
3.15 Additional Setup Menus Within the ALARMS Submenu *Not included in the Quick Setup configuration The ALARMS submenu (70) contains the setup menus for programming and viewing the flowmeter’s alarm parameters. Up to 4 alarms may be independently programmed ON or OFF based on flow rate or signal strength values.
..Additional setup menus within the ALARMS submenu Programming the alarm continued 9. Repeat steps 1-8 for each alarm you want to program. 3.15-B 3.15-F ( IGURES THROUGH LEFT TO RIGHT TOP TO BOTTOM 3.15.2 Viewing Alarms To view the ON/OFF status of the alarms: 1.
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..Additional setup menus within the DATA LOG submenu The flowmeter stores completed datalog files and assigns a unique file number to each log. This allows data logs to be recorded and retrieved. Additionally, files can be viewed, deleted, or transferred in ASCII format to an IBM ®...
..Additional setup menus within the DATA LOG submenu 2. Interval menu (81): Data log intervals must be entered in whole seconds, with a minimum interval of 1 second (Figure 3.16-F, below). 3.16-F IGURE 3. View menu: Use this menu to view which log files are stored in memory, the file sizes, and amount of log memory still available.
..Additional setup menus within the DIAGNOSTICS submenu 3. Reynolds Number/Profile Factor display (92): Displays the Reynolds number and flow profile factor currently being used by the flowmeter. The flow profile factor is calculated by the flowmeter and used to determine the effect of the flow profile on mean measured fluid velocity (Figure 3.17-C, below). 4.
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..Additional setup menus within the PRINT submenu 1. Print Log Setup menu continued d. Enter the print interval in whole seconds, and press ENTER. Operation errors may occur if the log interval is too short to allow the selected data to be printed.
4. W & I IRING NSTALLING THE RANSDUCERS Wiring The transducer terminals and cables are arranged in pairs and are labeled DN STREAM and UP STREAM. The downstream transducer cable has blue-banded ends; the upstream transducer has red-banded ends. IGURE Locate the symbol seen in Figure 4.1.
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..Site selection & preparation 4.2-B IGURE Use the following guidelines when selecting the transducer site: a. Choose a section of pipe which is always full of liquid, such as a vertical pipe with up flow or a full horizontal pipe. b.
..Pipe selection & preparation Pipes with excessive corrosion or scaling create conditions which can make accurate measurement difficult or impossible; if possible, avoid selecting these sections of pipe as mounting locations. g. Remove any dirt, grease, rust, loose paint, or scale from the pipe surface prior to mounting the transducers.
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..Spacing & mounting the transducers 6. Install the portable transducers: a. Position the slides according to the calculated spacing. The top rail of the rack is marked in inches and the bottom rail is marked in millimeters. b. Apply sonic coupling compound to a transducer face, and with the cable connector end of the transducer towards the outside of the rack, install the transducer beneath one of the slides.
..Spacing & mounting the transducers 8. Continued a. Refer to Figure 1.6 (page 5) to locate the upstream and downstream connectors on the side of the meter. b. The upstream transducer cable has red-banded ends, and the downstream transducer cable has blue-banded ends (Figure 4.3-B, page 36).
..V method 4.4-A: V M IGURE OUNT 4.4.2 W Method In many instances, flowmeter performance on small metallic pipes with outer diameters of 4 inches (100 millimeters) or less can be improved by using the W mounting method (Figure 4.4-B, below). With the W method, the sound wave traverses the fluid 4 times and bounces off the pipe walls 3 times.
4.4.3 Z Method The signal transmitted in a Z method installation has less attenuation than a signal transmitted with the V method. This is because the Z method utilizes a directly transmitted (rather than reflected) signal which transverses the liquid only once. The Z method (Figure 4.4-C, below) is used primarily in applications where the V method cannot work due to signal attenuation from excessive air or solids in the liquid, thick scale, poorly bonded linings, or very large pipes.
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..Z method 4.4-D 4.4-I ( IGURES THROUGH LEFT TO RIGHT TOP TO BOTTOM 10. Draw a horizontal line along the pipe from the centerline of the 3 o’clock transducer position. Refer to Figure 4.4-J (below), and use a level to ensure that the line is level with the top of the pipe. The line should be at least 3 inches (76 millimeters) longer than the transducer spacing calculated by UltraScan.
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..Z method 12. Wrap the paper firmly back on the pipe. Have the point where the ends of the paper come together line up with the horizontal line on the 3 o’clock side of the pipe. Ensure that the inside corner of the straight edge of the paper is aligned with the mark made for the transducer spacing.
..Z method The figure below illustrates the final Z method installation. 4.4-P IGURE 4.4.4 WV and WW Methods For applications with pipe diameters smaller than 2 inches (50 millimeters), the WV and WW methods are options to achieve higher accuracy and stability when reasonable signal strength can be obtained (10% or higher).
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Other tape materials generally do not satisfy performance or safety specifications. Please contact Thermo when more tape strips are needed. 1. Wipe grease off the coupling surfaces of both transducers. Clean the surfaces with detergent and let dry (Figure 4.5-B, below).
5. E & M MERGENCY VERRIDES ASTER RASE Since these 2 procedures allow critical data to be accessed and changed, this page may be re- moved from the instruction manual to prevent unauthorized use of these features. Emergency Overrides In the event that a user-entered password is forgotten, the following emergency override passwords may be used: 42 for the system password and 43 for the scale factor password.
6. M & T AINTENANCE ROUBLESHOOTING Replacing the Fuse Prevent possible electrical shock and/or damage to the meter – disconnect power to the meter PRIOR to wiring. 6.1.1 Flowmeter Fuse The fuse located on the front panel of the flowmeter (upper right corner) protects the instrument from overcurrent or short circuits from the internal battery.
Charging the Flowmeter The DCT7088 is a DC-powered instrument that normally operates from the internal 12-V battery supplied with the unit. It may also be powered by one of the following sources which connect to the 12-15 Vdc input on the breakout box: •...
6. If we determine the problem cannot be resolved over the phone, return the entire unit to the factory. 6.5.2 Local Representative Support The local Thermo representative is the first contact for support and is well equipped to answer questions and provide application assistance. Your representative has access to product information and current software revisions.
Thermo plant. A shop charge may apply for alignment and calibration services. Thermo shall be liable only to replace or repair, at its option, free of charge, products which are found by Thermo to be defective in material or workmanship, and which are reported to Thermo within the warranty period as provided above.
A: P PPENDIX CHEDULES This appendix provides pipe schedules as a convenient reference for the following pipe materials: steel, stainless steel, and PVC (Table A-1); cast iron (Table A-2); ductile iron (Table A-3). The inside diameters (IDs) listed in the following tables are calculated from the outside diameter (OD) and minimum wall thicknesses as specified in applicable standards.
B: F PPENDIX LUID ROPERTIES B.1 Fluid Sound Velocities & Kinematic Viscosities This section provides a table of fluid sound speeds and kinematic viscosities. The information is based on material from the Cameron Hydraulic Data Book (17th ed., Ingersoll-Rand, 1988) and Table of Physical and Chemical Constants (13th ed., Longmans, 1966).
B.3 Relationship Between Specific Gravity, Viscosity, & Sound Velocity for Petroleum Products The graph below depicts the approximate relationship between specific gravity, viscosity and sound velocities for aliphatic hydrocarbons (petroleum products).
ONITORING OWNLOADING SING D-Link is PC-based user interface software that can communicate with DCT6088 and DCT7088 flowmeters to monitor and download data log information. C.1 Installing D-Link Start the PolyCD and select D-Link in Communication Software. Follow the instructions to install D-Link.
C.3 Monitoring Data Logs Once communications between the PC and the meter establish, the program opens as shown in Figure C.3-A (below). Click the arrow below Get Log, and select the log file you want to check. Click Get Log. The log information downloads and displays as seen in Figure C.3-B (page 71).
..Monitoring data logs C.3-B: D IGURE ISPLAYED LOG C.4 Saving & Loading Data Logs To save the currently displayed data log to a file, go to File and select Save Log. The file can then be opened in data processing software such as Excel ®...
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