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Resumen del manual
Refer to Figure 1. The loop supply voltage vs. loop resistance shows the minimum supply voltage (Vmin) required for a given loop resistance (RLOOP). Excitation (Ratiometric Output Only) For proper operation a voltage within the range of 5 to 10 Vdc must be applied between the transducer’s supply terminals. Noise For minimum noise susceptibility, avoid running the transducer’s cable in a conduit that contains high current AC power cables. Where possible avoid running the cable near inductive equipment. Shield Wiring Connect the braided shield to the guard terminal on the reading instrument (meter, etc.) if available or to ground or to the power supply negative terminal. Adjustment Potentiometers The zero and span pots are accessible through the top of the case. Loosen the four screws and separate the top carefully. The zero pot is marked with a white dot. Vent Tube The cable will have a clear Teflon vent tube that's required at pressure below 500 psi to provide atmospheric reference. The open end should be placed in a dry area. Life Support Policy These products are not authorized for use as critical components in life support devices or systems. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. Figure 1. Loop Supply Voltage vs. Loop Resistance Loop Supply Voltage vs. Loop Resistance for 4-20mA Output Only Loop Supply Voltage (Vdc) Vmin = 10V + [.022A*(RL)] *includes a 10% safety factor RL = RS + RW RL = Loop Resistance (ohms) RS = Sense Resistance (ohms) RW = Wire Resistance (ohms) Loop Resistance (Ohms)1000 750 500 250 0 0 36 2010 1182 30 PX791 & PX792 Series Dimensions A B C D MODEL A B C D SERIES S15 0.8 4.7 0.9 2.0 PX791 S20 0.8 4.7 0.9 2.5 PX792 PX791 & PX792 SANITARY TRANSDUCERS – ELECTRICAL CONNECTIONS Voltage Output Units 1-5, 1-6 Vdc CABLE TYPE F2 Red = + Power White = Common Green = Output CABLE TYPE C1 Red = + Power White = Common Green = Output HIRSCHMANN TYPE PIN-1 = + Power PIN-2 = Common PIN-4 = Output BENDIX 4-PIN, 6-PIN Pin A = + Power Pin B = Output Pin D = Common Current Output Units 4-20mA CABLE TYPE F2 Red = + Power Black = Power CABLE TYPE C1 Red = + Power Black = Power HIRSCHMANN TYPE Pin-1 = + Power Pin-2 = Power BENDIX 4-PIN, 6-PIN Pin A = + Power Pin B = Power Ratiometric (mV/V) CABLE TYPE F2 Red = + Power White = – Power Green = + Output Black = – Output CABLE TYPE C1 Red = + Power White = – Power Green = + Output Black = – Output HIRSCHMANN TYPE Pin A = + Power Pin B = + Output Pin C = – Output Pin D = – Power BENDIX 4-PIN, 6-PIN Pin A = + Power Pin B = – Power Pin C = + Output Pin D = – Output Pin E = Shunt Cal. Pin F = Shunt Cal. WARNING: READ BEFORE INSTALLATION The diaphragm is very sensitive and fragile! Do not let anything touch the diaphragm but the fluid to be measured. Fluid hammer and surges can destroy any pressure transducer and must always be avoided. A pressure snubber should be installed to eliminate the damaging hammer effects. Fluid hammer occurs when a liquid flow is suddenly stopped, as with quick-closing solenoid valves. Surges occur when flow is suddenly begun, as when a pump is turned on at full power or a valve is quickly opened. Liquid surges are particularly damaging to pressure transducers if the pipe is originally empty. To avoid damaging surges, fluid lines should remain full (if possible), pumps should be brought up to power slowly, and valves opened slowly. To avoid damage from both fluid hammer and surges, a surge chamber should be installed. Symptoms of fluid hammer and surge's damaging effects: a) Pressure transducer exhibits an output at zero pressure (large zero offset). If zero offset is less than 10% FS, user can usually re-zero transducer, install proper snubber and continue monitoring pressures. b) Pressure transducer output remains constant regardless of pressure. c) In severe cases, there will be no output. WIRING DIAGRAMS FOR ALL TRANSDUCERS + + – – POWER SUPPLY (- Power) (+ Power) (- Output) (+ Output) METER TRANSDUCER RED WHITE GREEN BLACK 4-Wire Ratiometric (mV/V) + + – – POWER SUPPLY (Common) (+ Power) (+ Output) METER TRANSDUCER 3-Wire Voltage + +– POWER SUPPLY (+) (–) METER TRANSDUCER – POWER OUTPUT 4-20mA MADE IN WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA’s Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping...
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