The NI 9230 is a C Series module designed for simultaneous analog input measurements, suitable for various industrial and hazardous location applications. It comes in two versions: one with screw terminals and one with BNC connectors, both referred to inclusively as the NI 9230 throughout the documentation.
Function Description
The NI 9230 provides connections to three simultaneously sampled analog input channels. It is capable of measuring voltages from both ground-referenced and floating signal sources. For Integrated Electronic Piezoelectric (IEPE) sensors, the NI 9230 provides an IEPE excitation current for each channel, allowing for direct measurement of IEPE sensors. The AI+ terminal provides the DC excitation (when enabled) and the positive input signal, while the AI- terminal provides the excitation return path and the signal ground reference.
Important Technical Specifications
- Analog Inputs (AI): 3 channels
- Voltage Range: ±30 V
- Resolution: 24 Bit
- Sampling Rate: 12.8 kS/s/ch (simultaneous)
- Isolation:
- Channel-to-channel: None
- Channel-to-earth ground:
- Continuous: 60 VDC, Measurement Category I
- Withstand: 1,000 Vrms, verified by a 5 s dielectric withstand test
- Measurement Category: I (for measurements on circuits not directly connected to the MAINS electrical distribution system). Not intended for direct connection to MAINS building installations of Measurement Categories II, III, or IV.
- Hazardous Locations Suitability:
- Class I, Division 2, Groups A, B, C, D, T4
- Class I, Zone 2, AEx nA IIC T4 and Ex nA IIC T4
- Nonhazardous locations
- Operating Temperature: -40 °C to 70 °C (IEC 60068-2-1, IEC 60068-2-2)
- Operating Humidity: 10% RH to 90% RH, noncondensing (IEC 60068-2-78)
- Pollution Degree: 2
- Maximum Altitude: 5,000 m
- Capacitance (for Division 2 and Zone 2 applications): 0.08 µF max
- Transient Disturbances (for hazardous locations): Must not exceed 140% of the rated voltage.
- EMC Compliance: Tested and complies with regulatory requirements. Intended for use in industrial locations.
Usage Features
- Installation: Before beginning, users must complete software and hardware installation procedures as outlined in their chassis documentation. The NI 9230 should only be operated as described in its documentation.
- Safety Precautions:
- Do not operate the NI 9230 in a manner not specified in the document to avoid hazards and compromise of safety protection.
- Connect only voltages within the specified safety limits (60 VDC continuous, 1,000 Vrms withstand for channel-to-earth ground).
- Do not connect to signals or use for measurements within Measurement Categories II, III, or IV.
- For hazardous locations, do not disconnect I/O-side wires or connectors, or remove modules, unless power has been switched off or the area is known to be nonhazardous.
- Substitution of components may impair suitability for Class I, Division 2.
- For Division 2 and Zone 2 applications, the system must be installed in an enclosure rated to at least IP54 (IEC/EN 60079-15).
- For Division 2 and Zone 2 applications, connected low impedance sources must include a protection device between the source and the AI terminals to prevent AI+ to AI- voltage from exceeding 42 V during transient overvoltage.
- Connected signals for Division 2 and Zone 2 applications must be within specified capacitance limits (0.08 µF max).
- The enclosure must have a door or cover accessible only by the use of a tool.
- EMC Compliance:
- Operate with shielded cables and accessories to ensure specified EMC performance. Unshielded cables/accessories are only permissible if installed in a shielded enclosure with properly designed and shielded input/output ports and connected to the product using a shielded cable.
- I/O cables must not exceed 30 m (100 ft) in length.
- Connect the cable shield to the chassis ground.
- For the screw terminal version, install clamp-on ferrite beads (part number 782802-01) on the input cable for each connected channel, as close to the module as possible.
- Marine Applications: For marine applications, the product must be installed in a shielded enclosure with shielded and/or filtered power and input/output ports. Precautions must be taken with measurement probes and cables to ensure EMC performance.
- Wiring for High-Vibration Applications (screw terminal version):
- Use ferrules to terminate wires to the detachable connector.
- Use the NI 9971 backshell kit.
- Signal Connections: The NI 9230 supports both ground-referenced and floating signal sources. When making ground-referenced connections, ensure AI+ and AI- voltages are within the channel-to-earth safety voltage range.
- Pinout: The manual provides detailed pinout diagrams for both screw terminal and BNC versions, indicating AI0+, AI0-, AI1+, AI1-, AI2+, and AI2- connections. For screw terminals, 2-wire ferrules are recommended for secure connections when multiple wires connect to a single terminal.
Maintenance Features
- Repair: If the product is damaged, it should be returned to NI for repair.
- ESD Prevention: Use industry-standard Electrostatic Discharge (ESD) prevention measures during installation, maintenance, and operation to prevent damage to the NI 9230.
- Documentation: Refer to the device datasheet on ni.com/manuals for complete specifications and additional information on operating voltages and overvoltage protection.
- Support and Services: NI offers worldwide technical support via ni.com/support, factory installation services, repairs, extended warranty, and other services via ni.com/services. Product registration is available at ni.com/register. Declaration of Conformity (DoC) and calibration certificates can be found at ni.com/certification and ni.com/calibration, respectively.
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