智能沉浸式液位变送器
SMART IMMERSION LEVEL TRANSMITTER
LT-26R |
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RANGE | |
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0/0.5 ~ 200 METER |
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SENSOR | |
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CERAMIC FOR CHEMICAL RESISTANCE |
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DISPLAY | |
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16 * 2 ROW ALPHA-NUMERIC |
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MOUNTING | |
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2" PIPE MOUNTING |
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ACCURACY | |
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-0.2%,0.2% F.S |
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OUTPUT | |
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4 - 20mA |
Nominal span: the pressure interval between the minimum and maximum values of the sensor nominal range. The span is a number. Measuring range: the pressure range between minimum and maximum for which the transmitter has been calibrated. Measuring span: the pressure interval between minimum and maximum values of the measuring range. Input scale initial value or zero input: minimum pressure value included in the measuring range. Input full scale value: maximum pressure value included in the measuring range. 1) Transmitter Parameters. The parameters that are available for display and setting are: Measuring Span: possibility to change by 0.05% steps from 120% to 7% of the nominal span. (see table). Zero Adjustment: by 0.1% steps from -9.9% to +9.9% of measuring span Span Adjustment: by 0.1% steps from -9.9% to +9.9% of measuring span Suppression/Elevation: by 0.05% steps of nominal span from 0 to 100% for elevation and from 0 to 93% for suppression Damping : adjustable by 1 sec steps from 0 to 15 sec. Reverse Output : obtained via software Measuring Units : for the measuring span display, one of the following units may be selected: mbar, bar-kPa, MPa-mmH20, mH2O, ㎏ /㎠ . GENERAL The transmitter LT-26R measures levels of liquids in open tanks at atmospheric pressure. The LT-26R comprises two main element: the immersion pressure sensor and the electronic module connected by a cable of variable length. The sensor generates a signal corresponding to the hydrostatic pressure and it is complete with a PTC thermistor which also transmits the temperature of the measuring cell to the electronic system. On the basis of these two values and of the configuration parameters the electronic system generates a standard output signal (4 to 20mA, two wires system) and displays all the necessary data on the LCD display. The operating parameters can be changed by means of the four pushbuttons that are below the LCD display. Among the relevant characteristics of this microprocessor based transmitter, are the following: -wide rangeability for the measuring span (abt. 1 to 17) -automatic temperature compensation in the measuring cell FUNCTIONAL DATA With reference to the following, please note these definitions: Nominal range: (referred to the sensor mounted on the instrument) the pressure range (included between a minimum and a maximum values) to measure for which the sensor has been designed.
HYSICAL SPECIFICATIONS Materials SENSOR Diaphragm: Hastelloy-C or ceramic, SUS 316L. Other wetted parts: SUS 316, HASTELLOY-C, SUS 316+ PTFE, Other special. Gaskets: PTFE. Bolts: SUS 316. Filling fluid: silicone oil (ceramic oilless). CABLE Acrylic insulated - conductors and shield in copper - reference tubing in PTFE. Connectors: Aluminium processed and passivated - MILC26482 ELECTRONIC MODULE Housing: Die cast aluminium alloy AL UNI 4514 finished with epoxy resin (RAL 5014) Bracket for 2 inch pipe mounting: zinc coated carbon steel Identification tag: S.S. Environmental protection. The transmitters is dust and sand tight and protected against sea waves effects as defined by IEC IP 66. - Suitable for tropical climate operation as defined in DIN 50.015. Electrical connections Two cables entries on electronic for output signal (up to 1.5 . 14 AWG)㎟ . Earth connections for shield of cable. EXPLOSION PROTECTION Classification Type: intrinsic safety Ex ia IIC, T6, T5, T4. Max Amb. temp.: 40℃ for T6, 55℃ for T5, 80℃ for T4 Condition A No-load voltage: = 30 V d.c. Short circuit current: = 120 mA. Max transferred power: 0.75 W. Condition B No-load voltage: = 25.2 V d.c. Short circuit current: = 152 mA. Max transferred power: 0,95 W.
Physical Characteristics. Power supply : 12.35 - 30 Vdc with no load Supply voltage to permissible load relation: 0/250 Ohm for 17.35 Vdc 0/582.5 Ohm for 24 Vdc 0/882.5 Ohm for 30 Vdc Output signal : 4 -20mA, 2 wires Overpressure limits: see table Settling time : 150 ms (at 27℃ ) Connecting cable - Insulating: 5000 V a.c. - Voltage test: conductor/conductor 1500 V a.c. per min., conductor/shield 1000 V a.c. per min. - Capacity: conductor/conductor 50 pF/m; conductor/shield 90 pF/M. - Inductance: 1 mH/km. - L/R loop rate: = 10 μ H/? OPERATING AND CONDITIONS Temperature Process fluid : -20 ~ + 80℃ Housing : -20 ~ + 80℃ Transportation and storage : -20 ~ + 90℃ Relative Humidity : 0 ~ 100% LCD display reading : -10 ~ + 65℃ Performance Unless otherwise stated, performance specifications are referred at atmospheric pressure, nominal span, silicone oil filling and are given as a percentage of span. Accuracy rating: it is assured within the following limits: Non linearity : resettable with 0.1% accuracy. Repeatibility : = 0.10%. Hysteresis : = 0.10%. Dead band : negligible. OPERATING INFLUENCES Thermal drift: it is referred to -10 ~ + 65℃ range. Zero: ± 0.1%/10。K. Span: ± 0.1%/10。K at nominal range. Power supply effect : Negligible between 12.35 and 30 V dc
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