 LT-260顶部安装沉浸式液位变送器TOP MOUNTING IMMERSION LEVEL TRANSMITTER
| LT-260 |
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RANGE | |
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-1/0/50 mmHO ~ 5 kg/cm² |
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SENSOR | |
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CERAMIC SENSOR WITH FLANGE MOUNTING |
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OUTPUT | |
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4 - 20mA WITH ZERO & SPAN ADJUSTABLE |
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PROTECTION | |
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Exd IIC T6 |
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
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 and square root extraction : Selectable
via software.
Measuring Units : For the measuring span display, one of
the following units may be selected:
mbar, bar, kPa, MPa, mmH20, mH2O, ㎏ /㎠ , mmHg.
GENERAL
The transmitter LT-260 measures levels of liquids in open
tanks at atmospheric pressure.
The LT-260 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 which the
sensor has been designed.
REF.
NOM. RANGE
mH2O
SPAN
min.(mH2O)max
OVERPRESS.
bar
N 0 / 1.6 0.112 - 1.92 10
P 0 / 4 0.28 - 4.8 10
Q 0 / 10 0.7 - 11 30
R 0 / 25 1.75 - 26 30
S 0 / 60 4.2 - 61 30
T 0 / 160 11.2 - 161 100
U 0 / 400 28 - 401 100
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 wiresl
Overpressure limits :See table
Settling time : 150ms (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 ;F/m; conductor /
shield 90 pF/M.
- Inductance : 1mH/km.
- L/R loop rate : ≤10μH/Ω
3) 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 percent of span.
Accuracy rating: It is assured within the following limits:
Non linearity : Resettable with 0.1% accuracy.
Repeatability : = 0.10%
Hysteresis : = 0.10%
Dead band : negligible
Operating Influences
Thermal drift: It is referred to -10 ~ + 65℃ range.
Zero: 0.1%/10℃ . Span: 0.1%/10℃ at nominal range.
Power supply effect :
Negligible between 12.35 and 30 V d.c.
Intelligent Transmitters
GT-438
12 - 99
4) PHYSICAL SPECIFICATIONS
Materials
SENSOR
Diaphragm : Hastelloy C or ceramic, SUS 316L.
Other wetted parts : SUS 316. Hastelloy - C,
SUS 316 + PTFE, Other special.
Gaskets : P.T.F.E
Bolts : SUS 316.
Filling fluid : Silicon oil (No use for ceramic)
CABLE
Acrylic insulated - conductors and shield in copper- reference
tubing in PTFE.
Connectors :
Aluminium processed and passivated-MILC26482
ELECTRONIC MODULE
Housing : Die cast aluminum alloy AL UNI 4514 finished
with epoxy resin (RAL 5014).
Nameplate : Stainless steel, fixed on housing.
Flange mounting: SUS 316 or PVC flange
Identification tag : S.S.
Environmental protection:
The transmitter 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 cable entries on electronic
for output signal( up to 1.5㎟. 14 AWG)
Earth connections for shield of cable.
5) 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.
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