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4-20 mA Current Output Transmitter
for Resistance Input in Ohms
Exceptional accuracy at high update rates.
DIN Rail mounted, digitally programmable.
Key Features
- Five precalibrated resistance input ranges from 20.000 Ω to 200.00 kΩ
- 1 mΩ resolution on 20 Ω scale
- Exceptional accuracy and repeatability
- 2, 3 or 4-wire connection with lead resistance compensation
- Isolated 4-20 mA, 0-20 mA or 0-10 Vdc analog output (jumper selectable)
- Output resolution: 0.0015% of span (16 bits)
| Range |
Resolution |
Accuracy |
Excitation Current |
0-20.000 Ω
0-200.00 Ω
0-2000.0 Ω
0-20000 Ω
0-200.00 kΩ | 1 mΩ
10 mΩ
100 mΩ
1 Ω
10 Ω | ±0.01% of range
± 2 counts | 5 mA
500 µA
50 µA
5 µA
500 nA |
| Signal Input |
Input Resolution
Input Accuracy
Update Rate, Max |
16 bits (65,536 steps)
±0.01% of full scale ± 2 counts
50/sec at 50 Hz, 60/sec at 60 Hz |
| Analog Output |
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
0-20 mA or 0-10 Vdc (selectable)
10V ( 0-500 Ω load )
2 mA ( 5 kΩ load )
16 bits (65,536 steps)
0.02% of output span plus conversion accuracy
250V rms working, 2.3 kV rms per 1 minute test |
| Dual Relay Output(standard) |
Relay Type
Load Rating |
Two solid state relays, SPST, normally open, Form A
130 mA at 140 Vac or 180 Vdc |
| 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 w/o a repeater. |
| Power Input |
Standard Power
Low Power Option
Power Frequency
Power Isolation
Power Consumption |
85-264 Vac or 90-300 Vdc (DC operation not UL 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. |
Pinout
Laureate 4-20 mA Resistance Transmitter
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| Resistance Measurement with Excitation & Lead Compensation |
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Ohm transmitter hookup can be via 2, 3 or 4 wires to the J5 connector. The transmitter applies a fixed excitation current for each resistance range.
In 4-wire hookup, different pairs of leads are used to apply the excitation current and sense the voltage drop across the unknown resistance, so that the IR drop across the excitation leads is not a factor. |
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In 3-wire hookup, the transmitter senses the combined voltage drop across the unknown resistance plus two excitation leads. It also senses the voltage drop across one excitation lead, and then subtracts twice this voltage from the combined total. This technique effectively subtracts all lead resistance and compensates for ambient temperature changes if the two excitation leads are identical. |
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In 2-wire hookup, the transmitter senses the combined voltage drop across the unknown resistance and both lead wires. The voltage drop across the lead wires can be measured by shorting out the resistance during transmitter setup, and this voltage is then automatically subtracted from the combined total. However, changing resistance of the lead wires due to ambient temperature changes will not be compensated. |
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