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- Overview
- Specifications
- Description
- Applications
- Troubleshooting
- FAQ
- Recommended Products
Overview
Place of Origin: |
Sweden |
Brand Name: |
ABB |
Model Number: |
NTDI21-A |
Packaging Details: |
Original new Factory Sealed |
Delivery Time: |
5-7 days |
Payment Terms: |
T/T |
Supply Ability: |
In stock |
Specifications
|
Parameter |
Value |
|
Model |
NTDI21-A |
|
Product Type |
Termination Unit |
|
Dimensions |
18 × 17.6 × 2 cm |
|
Weight |
0.36 kg |
|
Input Impedance (Voltage) |
>10 MΩ |
|
Input Impedance (Current) |
<0.2 Ω |
|
Temperature Drift |
<0.01% / °C |
|
Environmental Rating |
IP65 |
|
Mounting Options |
DIN rail or panel mount |
Description
The ABB NTDI21-A is a termination unit. It is primarily used for daily status monitoring of industrial processes, operation monitoring of large machinery, and measurement of changes in the surrounding environment of the plant. It connects field instruments to the control center, receiving pressure and temperature signals. The module neatly arranges external cable ends via a terminal block and transmits signals to the processing card.
Applications
Oil Refineries: Sealed protection for reliable operation in outdoor pipelines and valve cabinets.
Chemical Plants: High input impedance enables accurate low-signal sensor measurement over long distances.
Thermal Power Plants: Low temperature drift ensures stable accuracy in high-heat boiler and flue environments.
Water Treatment Plants: Waterproof housing supports continuous operation in high-humidity and spray areas.
Metallurgy Plants: Low impedance design reduces ground loop interference in high-current industrial environments.
Troubleshooting
Signal attenuation / low analog value: Check transmitter output impedance. Despite >10 MΩ input, wiring damage or grounding leakage can reduce signal level.
Current loop failure: With <0.2 MΩ input impedance, verify 4–20 mA output and check for loose terminals or loss of field power.
Temperature drift instability: If drift exceeds <0.01%/°C, internal components may be aged; replace module.
FAQ
Q: What is the input impedance of NTDI21-A in voltage input mode?
A: Its voltage input impedance is greater than 10 MΩ.
Q: What is the input impedance of NTDI21-A in current input mode?
A: Its current input impedance is less than 0.2 Ω.
Q: What is the temperature drift of NTDI21-A?
A: Its temperature drift is less than 0.01% / °C.
Q: What is the environmental rating of NTDI21-A?
A: Its environmental rating is IP65.
Q: What mounting method does NTDI21-A use?
A: It supports DIN rail or panel mounting.
