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LTA-VF
4-20 mA Current Transmitter &
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Description The Laureate LTA-VF process signal input totalizing transmitter accepts 0-1 mA, 4-20 mA or 0-10V signals from flow meters and other transducers, such as watt meters, to track rate or totalized rate.
Three analog transmitter settings are jumper selectable: 4-20 mA, 0-20 mA or 0-10V. All selections provide 16-bit (0.0015%) resolution of output span and 0.02% output accuracy. The output tracks the reading from -99,999 to +99,999 counts that would be transmitted digitally. For process signals, this reading has a rated accuracy of ±0.01% of full scale input and can be scaled in software. Output isolation from signal and power grounds eliminates potential ground loop problems. The supply can drive 20 mA into a 500 ohm (or lower) load for 10V compliance, or 10V into a 5K ohm (or higher) load for 2 mA compliance. Standard features of Model LTA-VF include:
Easy Transmitter programming is via Laurel's Instrument Setup Software, which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Laurel (P/N CBL04). |
The V-to-F signal conditioner
board converts the full-scale 0-1 mA, 4-20 mA or 0-10 V analog signal to a frequency of
10 kHz to 110 kHz. This frequency is determined by measuring period over a selected gate time
(from 10 ms to 200 s) and taking the inverse of period. At
the lowest frequency of 10 kHz and the minimum gate time of 10 ms, the
transmitter is capable of
25 updates per second. Scaling is done mathematically. Totals are stored in nonvolatile memory in case of
power loss.
Specifications
LTA-VF 4-20 mA Transmitter & Totalizer
for 0-1 mA, 4-20 mA or 0-10V Signals
| Analog Input | 0-1 mA | 4-20 mA | 0-10 V |
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Input resistance Max current or voltage |
182 ohms 37 mA |
9 ohms 160 mA |
1 Mohm 600 V |
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Input Resolution Span Tempco Zero Tempco Accuracy at 25°C Read Rate |
6 digits |
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| Analog Output | |||
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Output Levels Compliance, 4-20 mA Compliance, 0-10V Output Resolution Output Accuracy Output Update Rate Output Isolation |
4-20 mA and 0-10 Vdc (selectable) 10V ( 0-500 ohm load ) 2 mA ( 5 kOhm load ) 12 bits (4,096 steps) ±0.05% of output span 25/sec 250V rms working, 2.3 kV rms per 1 minute test |
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| Transducer Excitation Output (standard) | |||
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Jumper Selection 1 Jumper Selection 2 Jumper Selection 3 |
10V @ 60 mA, isolated to 50V from signal ground 5V @ 50 mA, isolated to 50V from signal ground 15V @ 60 mA, non-isolated |
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| Dual Relay Output (optional) | |||
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Relay Type Load rating |
Two solid state relays, SPST, normally open,
Form A 120 mA at 130 Vac or 170 Vdc, 28 ohms in series |
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| Power Input | |||
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Standard power Low power option Frequency Power Isolation |
95-240 Vac ±10% or 90-300 Vdc (DC operation not UL approved) 12-30 Vac or 10-48 Vdc DC or 47-63 Hz 250V rms working, 2.3 kV rms per 1 min test |
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| Mechanical | |||
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Case Dimensions Case Mounting Electrical Connections |
120 x 101 x 22.5 mm 35 mm rail per DIN EN 50022 Detachable screw clamp plug connectors |
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| Environmental | |||
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Operating Temperature Storage Temperature Relative Humidity |
0°C to
70°C -40°C to 85°C 95% at 40°C, non-condensing |
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Pinout
LTA-VF 4-20 mA Transmitter & Totalizer
for 0-1 mA, 4-20 mA or 0-10V Signals
Ordering
Guide
LTA-VF 4-20 mA Transmitter & Totalizer
for 0-1 mA, 4-20 mA or 0-10V Signals
Click
on the radio buttons to build a model number with pricing.
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