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1
Model: CAT3-DC-MIL
107 Kitty Hawk Lane, P.O. Box 2145, Elizabeth City, NC 27906-2145
800-628-4584 252-331-1997 FAX 252-331-2886
www.hofferflow.com
E-mail: info@hofferflow.com
DC Powered Microprocessor
Controlled Transmitter
Style 5 Enclosure
USER'S MANUAL
HP-325
March 2025
107 Kitty Hawk Lane
P.O. Box 2145
Elizabeth City, NC 27909
●
●
1-800-628-4584
(252) 331-1997
Fax (252) 331-2886
●
●
www.hofferflow.com
email: info@hofferflow.com
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Related Manuals for Hoffer Flow Controls CAT3-DC-MIL
Summary of Contents for Hoffer Flow Controls CAT3-DC-MIL
- Page 1 Safety Model: CAT3-DC-MIL 107 Kitty Hawk Lane, P.O. Box 2145, Elizabeth City, NC 27906-2145 800-628-4584 252-331-1997 FAX 252-331-2886 www.hofferflow.com E-mail: info@hofferflow.com DC Powered Microprocessor Controlled Transmitter Style 5 Enclosure USER’S MANUAL HP-325 March 2025 107 Kitty Hawk Lane P.O. Box 2145 Elizabeth City, NC 27909 ●...
- Page 3 NOTICE HOFFER FLOW CONTROLS, INC. makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. This manual has been provided as an aid in installing, connecting, calibrating, operating, and servicing this unit.
- Page 4 LIMITED WARRANTY HOFFER FLOW CONTROLS, INC. ("HFC") warrants HFC's products ("goods") described in the specifications incorporated in this manual to be free from defects in material and workmanship under normal use and service, but only if such goods have been properly selected for the service intended, properly installed and properly operated and maintained.
- Page 5 FORWARD The manual contains the information required to install, operate, maintain, and repair a CAT3-DC-MIL Flow Rate Signal Converter. The CAT3-DC-MIL unit is intended to provide ships personnel with the ability to monitor flow of fuel and other liquids. HP-324-5...
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- Page 7 CONTENTS FORWARD ------------------------------------------------------------------------ i CONTENTS ----------------------------------------------------------------------iii Safety ------------------------------------------------------------------------ 1 Compliance ---------------------------------------------------------------- 3 Specifications -------------------------------------------------------------- 5 Model Number Designation ---------------------------------------- 6 Operation ------------------------------------------------------------------ 7 Preamplifier ----------------------------------------------------------- 7 Microcontroller ------------------------------------------------------- 7 Analog Output -------------------------------------------------------- 8 Scaled Pulse Output ------------------------------------------------- 9 Communications Interface ------------------------------------------ 9 Installation ---------------------------------------------------------------- 11 Power Supply -------------------------------------------------------- 11 Flowmeter Input ----------------------------------------------------- 11...
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- Page 9 Safety SAFETY The CAT3-DC-MIL Fuel Metering unit is designed to satisfy the safety requirements for shipboard use. The safety precautions and warnings described here are to be observed at all times. Additional precautionary messages appear throughout this manual. HP-324-5...
- Page 10 Safety This page intentionally left blank. HP-324-5...
- Page 11 Compliance COMPLIANCE This instrument is designed to conform to the EMC-Directive of the Council of European Communities 89/336/EEC. This instrument has been certified to meet MIL-S-901D for shock and vibration and MIL-STD-461F for EMI compliance. HP-324-5...
- Page 12 Compliance This page intentionally left blank. HP-324-5...
- Page 13 Specifications Specifications Input Signal Type: Magnetic pick up Input frequency range: 0.2 Hz to 4 KHz Signal level: 10 mV rms to 30 Vdc Power supply: 13-30 VDC Analog Output: 4-20mA, 24mA overflow condition Analog Output Response Time: 1/8 sec.* Load resistance: Max 650 Ohms at 24 Vdc Accuracy:...
- Page 14 Specifications Model Number Designation MODEL CAT3-( PULSE INPUT LINEARIZED PULSE OUTPUT LINEARIZED ANALOG OUTPUT POWER SUPPLY ALARM OUTPUT ENCLOSURE STYLE SPECIAL FEATURES PULSE INPUT MODEL CAT3-( )-( )-( ( A ) OPTION MAG COIL, PULSE, DRY CONTACT LINEARIZED PULSE OUTPUT MODEL CAT3-( )-( )-( )-( )-( ( B )
- Page 15 Operation OPERATION The CAT3-DC-MIL is a DC powered microprocessor-based transmitter, which provides pulse and analog outputs. The flowmeter input circuitry will accept a magnetic type pickup, pulse and contact closure. Optional 20-point linearization is available to correct for flowmeter non-linearity, improving overall system accuracy.
- Page 16 Flowrate is in gal/min. Frequency is in Hertz. Analog Output CAT3-DC-MIL provides an analog output current that is proportional to the flow rate. The analog output is scaled as follows: 4 mA = 0 GPM 20mA = Max Flow Rate in GPM If the calculated flowrate is greater than the 20mA setting, the current is set to 24mA to indicate an “Over-range”...
- Page 17 Operation Scaled Pulse Output CAT3-DC-MIL Pulse Output can be configured for turbine raw frequency or for unit of measure scaled for the least significant digit of the internal total. A scaling factor of 1, 10 or 100 is available to reduce or increase the resolution of the pulse output.
- Page 18 Installation This page intentionally left blank. HP-324-5...
- Page 19 PCA180 for various input signals. Magnetic Pickup Coil SIG+ SIG- ANLG PULSE+ PULSE- PCA180 Mag Pickup Coil 5-3 Pulse Output CAT3-DC-MIL provides a Pulse Output option that is scaled per flow unit of measure. One output pulse represents one count of the least HP-324-5...
- Page 20 Installation significant digit of the total. When observing metered flow on an external counter or oscilloscope, the pulse output will display bursts of metered units due to the number of pulses in each 1 second increment of time determined by the Pulse Frequency setting. For steady flow, an oscilloscope will show the pulses per second for each second, a counter may seem erratic and increase 2 units for the first second then 3 units for the second (displaying as follows;...
- Page 21 TTL(0-5V), 0-10V, High Level (DC In), AC Square SIG+ USER DCS SIG- ANLG PULSE PULSE+ INPUT PULSE- PCA180 AC Square Analog Output CAT3-DC-MIL provides an Analog Output option that will output an analog current or voltage that is proportional to the flow rate. HP-324-5...
- Page 22 Installation Analog Output – DC Power POWER SUPPLY SIG+ SIG- ANLG PULSE+ PULSE- LOAD PCA183 4–20 mA Output Analog Output – The Microcontroller, located on PCA183, accepts the square-wave output of the preamplifier and performs all of the calculations that are required to control the Loop Driver. After measuring the frequency of the square-wave, the Microcontroller uses the following equations to compute the flow rate and current.
- Page 23 When installing CAT3-DC-MIL, it is a good practice to use shielded cables for all input and output signals. The shield should be connected to the earth ground lug on the CAT3-DC-MIL. The shield on the opposite end of the cable should be left open.
- Page 24 Installation coupled to the pickoff device. The metering section should not be subjected to excessive vibration or shock. Such a condition may result in a mechanically induced output signal from the pickoff device. A strainer, filter and/or air eliminator is recommended to reduce the potential of fouling or damage.
- Page 25 Preventative Maintenance PREVENTATIVE MAINTENANCE Introduction Observe any scheduled organizational level maintenance instructions dictated by the requirements of the Planned Maintenance System (PMS) established by the Naval Sea System Command for fuel system components. Unit Removal Turn off the power supply. Open the Style 5 enclosure and unplug the 10-pin terminal from the header.
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- Page 27 Troubleshooting TROUBLESHOOTING Introduction The troubleshooting techniques in this chapter are designed to isolate and locate the area of failure and to present the procedures for the replacement of subassemblies to make the system operational. Troubleshooting Procedures The required test equipment for troubleshooting is as follows: Digital Multimeter: Fluke Model 8060A or equal.
- Page 28 Troubleshooting defective pickup coil and the pickup coil must be replaced. With an established flowrate, configure the digital multimeter to measure AC volts, using the two volt scale. Connect the positive lead to pin A of pickup coil. And the negative lead to pin B of pickup coil. Depending on the flowrate an approximate voltage reading of 10 millivolts to 1 volt should be measured.
- Page 29 Appendix A – Default Configuration – Default Configuration Appendix A Factory default configuration: FIELD Value TAG NUMBER 10000000 LINEARIZATION Average K FACTOR DECIMAL POINTS AVERAGE K FACTOR 1.00 NUMBER OF LINEARIZATION POINTS FREQUENCY 1 4999.981 FREQUENCY 2 4999.982 FREQUENCY 3 4999.983 FREQUENCY 4 4999.984...
- Page 30 Appendix A – Default Configuration FIELD Value K FACTOR 16 1.00 K FACTOR 17 1.00 K FACTOR 18 1.00 K FACTOR 19 1.00 K FACTOR 20 1.00 CORRECTION FACTOR 1.000 TOTAL UNITS RATE UNITS MAX SAMPLE TIME 4 MA SETTING 00000.000 20 MA SETTING 99.999...
- Page 31 External power must be supplied to the CAT3 in order to communicate. Communications with the CAT3-DC-MIL also requires the use of the HOFFER HIT2A-301 Communications Cable and the Hoffer Windows Device Configuration Software. The computer serial port must be set to...
- Page 32 Appendix C – Drawings – Drawings Appendix C HP-324-5...
- Page 33 Appendix C – Drawings 25 HP-324-5...
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