DSCT34, Linearized 2- or 3-Wire RTD Input Transmitters
![DSCT34, Linearized 2- or 3-Wire RTD Input Transmitters](img/series/2289_DSCT.jpg)
![DSCT34, Linearized 2- or 3-Wire RTD Input Transmitters](img/series/2289_DSCT.jpg)
- Interfaces to 100 Ohm Platinum or 120 Ohm Nickel RTDs
- Linearizes RTD Signal
- Process Current Output
- 1500Vrms Transformer Isolation
- ANSI/IEEE C37.90.1 Transient Protection
- Input and Output Protected to 240VAC Continuous
- Up to 60V Loop Voltage
- 160dB CMR
- 85dB NMR at 60Hz, 80dB at 50Hz
- ±0.1% Accuracy
- ±0.025% Conformity
- Easily Mounts on Standard DIN Rail
- CSA and FM Approvals Pending
- CE Compliant
Each DSCT34 RTD input transmitter provides a single channel of RTD input which is filtered, isolated, amplified, linearized, and converted to a process current output. Signal filtering is accomplished with a five-pole filter, which provides 85dB of normal-mode rejection at 60Hz and 80dB at 50Hz. An anti-aliasing pole is located on the field side of the isolation barrier, and the other four are on the process loop side. After the initial field-side filtering, the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary technique to suppress transmission of common mode spikes or surges.
RTD excitation is provided from the transmitter using a precision current source. The excitation currents are very small (0.26mA max for 100 ohm Pt and 120 ohm Ni) which minimizes self-heating of the RTD. Linearization is achieved by creating a non-linear transfer function through the module itself. This non-linear transfer function is configured at the factory and is designed to be equal and opposite to the specific RTD non-linearity. Lead compensation is achieved by matching two current paths thus canceling the effects of lead resistance.
The specifications listed are for a 3-wire connection. A 2-wire connection of the RTD to the module is also possible and is achieved by adding a jumper between pin 5 (+EXC) and pin 6 (+IN) on the terminal block and connecting the RTD leads between pin 6 (+IN) and pin 7 (-IN). The 2-wire connection nullifies the lead resistance compensation feature of the module.
Special input and output circuits on the DSCT34 transmitters provide protection against accidental connection of power-line voltages up to 240VAC and against transient events as defined by ANSI/IEEE C37.90.1. Signal and loop power lines are secured to the module using screw terminals, which are in pluggable terminal blocks for ease of system assembly and reconfiguration.
The modules have excellent stability over time and do not require recalibration, however, zero and span settings are adjustable up to ±3% to accommodate situations where fine-tuning is desired. The adjustments are made using potentiometers located under the front panel label and are non-interactive for ease of use.
Input Type | RTD |
# of Inputs | 1 |
Output Type | 4 - 20 mA |
Max Bandwidth | 3 Hz |
Isolation | Yes |
Supply Power | 12 - 60 V DC |
DSCT34N-01 | RTD Type: 120 Ohm Ni, Input Range: 0 to 300 °C |
DSCT34-05 | RTD Type: 100 Ohm Pt, Input Range: 0 to 400 °C |
DSCT34-04 | RTD Type: 100 Ohm Pt, Input Range: 0 to 600 °C |
DSCT34-03 | RTD Type: 100 Ohm Pt, Input Range: 0 to 200 °C |
DSCT34-02 | RTD Type: 100 Ohm Pt, Input Range: 0 to 100 °C |
DSCT34-01 | RTD Type: 100 Ohm Pt, Input Range: -100 to 100 °C |
DSCT34 Linearized 2 or 3 Wire Input Transmitters V2 Datasheet |
DSCT34, Linearized 2- or 3-Wire RTD Input Transmitters Datasheet |
DSCT Diagram Drawings |
DSCT Intro Brochure |
AN101 RMS_Voltage_Current App Note |
AN105 Resistance Temperature Detector V2 App Note |
AN121 RiseTime vs BW App Note |
AN126 Tuning_Surge_Tank_Level_Control_Loops App Note |
AN127 OP-Amp Errors, another View App Note |
AN128 RMS Revisited App Note |
AN129 Harmonics and utility costs App Note |
Hysteresis Specifications Tech Note |
Data Acquisition Systems Accessories Tech Note |
Faraday's Law of Induction Tech Note |
Signal Conditioner Surge Withstand Capability Tech Note |
Signal-to-Noise Ratio, SNR Tech Note |
Signal Conditioning Measured vs Combinational Error Tech Note |
When Good Grounds Go Bad Tech Note |
Sample Test Report Tech Note |
Why Should Sensors Be Isolated Tech Note |
- Interfaces to Types J, K, T, E, R, S, B, and N Thermocouples
- Process Current Output
- 1500Vrms Transformer Isolation
- ANSI/IEEE C37.90.1 Transient Protection
- Input and Output Protected to 240VAC Continuous
- Up to 60V Loop Voltage
- 160dB CMR
- 85dB NMR at 60Hz, 80dB at 50Hz
Input Type | Thermocouple |
# of Inputs | 1 |
Output Type | 4 - 20 mA |
Max Bandwidth | 3 Hz |
Isolation | Yes |
Supply Power | 12 - 60 V DC |
- Interfaces to Types J, K, T, E, R, S, B, and N Thermocouples
- Linearizes Thermocouple Signal
- Process Current Output
- 1500Vrms Transformer Isolation
- ANSI/IEEE C37.90.1 Transient Protection
- Input and Output Protected to 240VAC Continuous
- Up to 60V Loop Voltage
- 160dB CMR
Input Type | Thermocouple |
# of Inputs | 1 |
Output Type | 4 - 20 mA |
Max Bandwidth | 3 Hz |
Isolation | Yes |
Supply Power | 12 - 60 V DC |
- Linearized Thermocouple Input Module
- 1500 V Transformer Isolation
- True 3-Way Isolation
- Accuracy: ± 0.08%
- DIN Rail Mounted Module
- ANSI/IEEE C37.90.1 Transient Protection
- Input Protected to 240 V AC Continuous
Input Type | Thermocouple |
# of Inputs | 1 |
Output Type | 0 - 10 V DC, 0 - 20 mA, 4 - 20 mA |
Max Bandwidth | 3 Hz |
Isolation | Yes |
Supply Power | 15 - 30 V DC |
- Non-Linearized Thermocouple Input Module
- 1500 V Transformer Isolation
- True 3-Way Isolation
- Accuracy: ± 0.05%
- DIN Rail Mounted Module
- ANSI/IEEE C37.90.1 Transient Protection
- Input Protected to 240 V AC Continuous
Input Type | Thermocouple |
# of Inputs | 1 |
Output Type | 0 - 10 V DC, 0 - 20 mA, 4 - 20 mA |
Max Bandwidth | 3 Hz |
Isolation | Yes |
Supply Power | 15 - 30 V DC |
- Linearized 2- or 3-Wire RTD Input Module
- 1500 V Transformer Isolation
- True 3-Way Isolation
- Accuracy: ± 0.08%
- DIN Rail Mounted Module
- ANSI/IEEE C37.90.1 Transient Protection
- Input Protected to 240 V AC Continuous
Input Type | RTD |
# of Inputs | 1 |
Output Type | 0 - 10 V DC, 0 - 20 mA, 4 - 20 mA |
Max Bandwidth | 3 Hz |
Isolation | Yes |
Supply Power | 15 - 30 V DC |