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Фрагмент инструкции
The sensor should be put in its normal operating position (vertical or horizontal). Remove the cover to gain access to the zero and span adjustment potentiometers. Zero adjustment uDepending on the model, set the zero adjustment to: 0.00 V, 4.00 mA or 12.00 mA. uSpan adjustment is carried out with the required span pressure applied to the + uDepending on the model, set the span adjustment to: 5.00 V, 10.00 V or 20.00 mA. uRelease the pressure. Completion Check the output at zero pressure and if necessary, repeat the zero and span adjustments. ¶ Release the pressure and disconnect the equipment. ¶ Refit the cover. Specification Pressure range:......................................................................0 to ±0.2 inH2O - 0 to ±150 psid Pressure media: All fluids, gases and vapors compatible with anodized AU4G, beryllium copper, tin and brazing solder and Loctite Master Joint 510 Accuracy:............................................................................................................ ±0.25% FS BSL (including linearity, hysteresis and repeatability) Long term stability:............................................................................±0.3% over 12 months Weight (approximate)...........................................................................................................2.1lbs Dimensions......................................................................................................................see below Electrical Specification Power supply LPX 5000.............................................10 to 30 V d.c. LPM 5000............................................18 to 30 V d.c. LPM 5000 (±5 V d.c. output)............±12 V d.c. G1/8 F via welded adapter Dimensions Installation CAUTION: 1. INCORRECT ELECTRICAL CONNECTIONS CAN, IN CERTAIN CIRCUMSTANCES, DESTROY THE ELECTRONIC OUTPUT CIRCUIT. 2. BEFORE APPLYING ELECTRICAL POWER, MAKE SURE THE SUPPLY VOLTAGE IS TO THE CORRECT RATING. 3. THIS A VERY SENSITIVE SENSOR, ONLY APPLY PRESSURE WITHIN THE PRESSURE RANGE. Mounting Two M5 threaded holes in the base of the sensor provide mounting points. Note: The screws must not enter the holes more than 0.4" into the sensor body. The installed position of the sensor should be away from sudden temperature variations, shocks and vibrations and should not be close to strong electromagnetic fields (transformers, motors etc.). The sensor can be mounted in any position, but mounting at an angle may require zero adjustment. For very low pressure sensors (less than 2.0 inH2O) the recommended mounting is horizontal. zero adjustment (fine) zero adjustment (coarse) span adjustment Internal detail filter time response selector switch square root output selection switch terminal connector (optional) block gland nut pressure connector (cable entry) Electromagnetic Interference To avoid electrical interference, use shielded cable with the shield connected to the earth ground at both ends. The ground of the sensor can be the casing or the ground terminal screw. Electrical connections PX548 Series (current output) The maximum allowable load resistance is calculated to formula: R Max = 0.05 (V supply - 10) kW Where: R Max in kW and V in Volts PX548 Series (Unidirectional voltage output) Minimum load 2 kW Note: Connections 5 and 6 are common If the output cable passes through an area of electrical disturbance, use a recommended load impedance of between 2 kW and 10 kW. Connect the load resistance between the wires corresponding to signal and - terminal at a point furthest from the sensor. PX548 Series bidirectional operation using bipolar power supply (±12 Vdc) with bidirectional output (0±5 Vdc or 0±2.5 Vdc) Connect the power supply to + for positive, - for negative, and 0 for neutral; connect the output to signal for positive and 0 for negative signal. Minimum load 1 kW Pressure connections The high pressure connector is marked + and the low pressure connector is marked –. Purging or de-gasing the sensor Two 5 mm hexagonal socket bleed screws are located on the outer casing and can be loosened to bleed the two pressure connectors. Make sure that these screws are tightened after this operation. Note: It is possible to changeover the bleed screws and pressure connectors enabling easier access or permitting installation in a difficult position. Square root output option This option only applies to the LPX 5000 sensor with 4 to 20 mA two wire connection and the square root electronics assembly fitted. A switch next to the terminal block selects the output mode. Switch Output mode OFF Linear ON Square root Filter response time The filter response time of the sensor, additional to the built-in response time of 10 milliseconds (approximately), can be set using the three switches next to the terminal connector. Using combinations of the switches can set different times. Switch Filter response time A 200 milliseconds B 400 milliseconds C 1 second Example: Switch A+B = 600 milliseconds Note: A hollow point ...