Laurel Electronics LT: 4-20 mA & Serial Data Transmitter-Totalizer for 0-1 mA, 4-20 mA or 0-10V Process Signals User Manual
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LAUREL
ELECTRONICS INC.
, 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 2
Specifications
Analog Input
0-1 mA
4-20 mA
0-10 V
Input resistance
Max current or voltage
182 Ω
37 mA
9 Ω
160 mA
1 MΩ
600 V
Input Resolution
Span Tempco
Zero Tempco
Accuracy at 25¿½°C
Read Rate
6 digits
±0.0025% R/°C
±0.0005 FS/°C
±0.005% FS ± 1 count
25/sec (typical)
Analog Output
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 ( 0-500Ω load )
2 mA ( 5 kΩ load )
16 bits (65,536 steps)
0.02% of output span
25/sec
250V rms working, 2.3 kV rms per 1 minute test
Serial Communications (standard)
Signal Types
Data Rates
Output Isolation
Serial Protocols
Modbus Modes
Modbus Compliance
Digital Addressing
RS232 or RS485 (half or full duplex)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test
Modbus RTU, Modbus ASCII, Laurel ASCII
RTU or ASCII
Modbus over Serial Line Specification V1.0 (2002)
247 Modbus addresses. Up to 32 devices on an RS485 line with no repeater
Transducer Excitation Output (standard)
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
Dual Relay Output (optional)
Relay Type
Load Rating
Two solid state relays, SPST, normally open, Form A
120 mA at 140 Vac or 180 Vdc
Power Input
Standard Power
Low Power Option
Power Frequency
Power Isolation
Power Consumption
85-264 Vac or 90-300 Vdc (DC operation not ETL approved)
10-48 Vdc or 12-32 Vac
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
2W typical, 3W with max excitation output
Mechanical
Dimensions
Mounting
Electrical Connections
129 x 104 x 22.5 mm case
35 mm rail per DIN EN 50022
Plug-in screw-clamp connectors
Environmental
Operating Temperature
Storage Temperature
Relative Humidity
Cooling Required
0°C to 55°C
-40°C to 85°C
95% at 40°C, non-condensing
Mount transmitters with ventilation holes at top and bottom.
Leave 6 mm (1/4") between transmitters, or force air with a fan.