NI-9219 C Series 4 CH 24 Bit AI Module

NI-9219 C Series 4 CH 24 Bit AI Module's core competitive advantage lies in its single-module coverage of 12 measurement types (voltage, current, thermocouple, RTD, resistance, 1/4-bridge/half-bridge/full-bridge strain, digital input, and open-contact detection), with each of the four channels independently configurable for different measurement types, making it ideal for mixed measurement systems with diverse sensor types. The module employs four independent 24-bit Δ-Σ ADCs for synchronous sampling and provides 250 VAC isolation between channels (Measurement Category II), balancing high accuracy with electrical safety.

Suitable scenarios: Mixed measurement systems with diverse sensor types (such as structural testing, automotive testing, and industrial process monitoring requiring simultaneous temperature, strain, and voltage/current measurements). Not suitable for: dynamic measurements requiring high sampling rates (NI-9218, 51.2 kS/s/ch recommended)

MXTD Wholesaler

MXTD company is a professional technology company integrating product research and development, sales, and service. With over ten years of experience in R&D, production, and sales, we serve our clients. Our main products are currently exported to various countries and regions worldwide, including North America, South America, Europe, and Africa. We also provide distribution services for major international brands to meet the diverse needs of our customers. We have strict and detailed quality control requirements to ensure that those who choose our products and brands can use them with confidence and that they better meet their current needs.

Description

The NI-9219 is the most accurate and flexible C-series general-purpose input solution for mixed sensor testing scenarios that require 'one module for multiple uses'.

The NI-9219 C Series 4 CH 24 Bit AI Module is a high-precision, general-purpose analog input module from NI's C-series, designed to meet the signal acquisition needs of multiple sensors with a single module. In industrial testing, scientific research, and embedded monitoring scenarios, engineers often need to simultaneously acquire different types of signals, such as temperature (thermocouples/RTDs), mechanical quantities (strain/load), and electrical quantities (voltage/current). Traditional solutions require dedicated modules for each sensor, resulting in low system channel utilization and high hardware costs. The NI-9219 significantly simplifies the system architecture by integrating reconfigurable signal conditioning circuitry and an independent 24-bit ADC on each channel, allowing each of the four channels to independently select the measurement type.

The Key Features

• Versatility of multiple measurement types

• High Precision and High Resolution

• Four Timing Modes

The NI-9219 C Series 4 CH 24 Bit AI Module offers four timing modes to optimize the balance between noise suppression and sampling rate for different application scenarios:

• Environmental Adaptability and Conformal Coating

The standard version NI-9219 operates in a temperature range of -40°C to 70°C, with a storage temperature range of -40°C to 85°C, an IP40 protection rating, and an operating humidity range of 10% to 90% RH (non-condensing). The conformal coated version (779781-02) additionally supports 80% to 100% RH condensing environments, making it suitable for corrosive, dusty, and condensing industrial environments.

Functions

• Voltage Measurement

The NI-9219's ADC directly measures the voltage difference between the HI and LO terminals, offering five ranges: ±60 V, ±15 V, ±4 V, ±1 V, and ±125 mV. The voltage/digital input mode (±60 V, ±15 V, ±4 V ranges) has an input impedance of 1 MΩ, while other measurement types have an input impedance >1 GΩ. Its wide voltage range of up to ±60 V allows it to cover the measurement needs of 12V/42V automotive electrical systems.

• Current Measurement

In current measurement mode, the NI-9219 converts current to voltage via an internal shunt resistor (≤40 Ω) for measurement by an ADC, with a range of ±25 mA. The current signal is connected to terminals 3 (HI) and 5 (LO).

• Thermocouple Measurement

In thermocouple mode, the NI-9219 C Series 4 CH 24 Bit AI Module uses an ADC with a ±125 mV range to return voltage readings and performs cold junction compensation (CJC) calculations using the built-in thermistor in each channel, with a CJC accuracy of ±1°C typical. The thermocouple sampling rate is 50 S/s/ch (lower than 100 S/s/ch in other modes). NI recommends using small-diameter thermocouple wires, maintaining a stable module orientation, and waiting for the thermal gradient to stabilize after system power-on for optimal measurement accuracy.

• RTD Measurement

The NI-9219 supports both 4-wire and 3-wire RTD modes, and is compatible with both Pt100 and Pt1000 standards. In 4-wire mode, the module outputs current between the EX+ and EX- terminals. Due to the high input impedance of the ADC, the current at the HI/LO terminals is negligible, so the wire resistance does not affect the measurement results. In 3-wire mode, the module applies a 2× gain to the negative wire voltage. The ADC uses this voltage as a negative reference to automatically compensate for the resistance error of the positive wire (provided that all wires have the same resistance).

• Resistance Measurement

Supports both 4-wire and 2-wire resistance modes, with measurement ranges covering 1 kΩ and 10 kΩ (actual ranges are 1.05 kΩ and 10.5 kΩ respectively). The 4-wire mode eliminates the influence of conductor resistance, while the 2-wire mode does not compensate for conductor resistance.

• Bridge Measurement (Strain Gauge/Load Sensor)

• Digital Input and Open Contact Detection

The digital input mode features a 60V single-pole threshold, which can be set in software. The open-contact detection mode determines whether the terminals are open by outputting current between the HI and LO terminals and measuring the current. Both modes are only supported on CompactRIO systems.

• Incentives and Protections

The core driver for the NI-9219 is NI-DAQmx, which is the unified driver software for NI data acquisition and signal conditioning devices. NI-DAQmx provides the following functions:

• DAQ Assistant: A graphical tool for configuring virtual channels and measurement tasks, automatically generating code
• Multi-language API: Supports LabVIEW, LabWindows/CVI, C/C++, C#, and Visual Basic .NET.
• NI MAX (Measurement & Automation Explorer): A unified management tool for device configuration, self-testing, and simulation device creation.
• NI-DAQmx Simulation Devices: Enables application development and testing without physical hardware.

Customization

We get it that standard arrangements do not continuously meet one of a kind prerequisites. Our experienced building group gives comprehensive OEM/ODM customization administrations. Whether you require adjusted recurrence ranges, specialized activating alternatives, or custom frame components, we work closely with you to create the idealize arrangement. Our adaptable plan approach guarantees your particular application needs are completely tended to whereas keeping up our quality standards.

FAQs:

✅Why is my NI-9219's sampling rate so low? Can it be used to measure vibration or transient high-frequency signals?

A: 

No. This is the most common misconception about the NI-9219. It is a slow, high-precision module. Its maximum sampling rate is only 100 s/s/ch (100 samples per second per channel).

Internally, it uses a 24-bit Delta-Sigma analog-to-digital converter (ADC). This architecture is specifically designed to suppress power frequency noise (50Hz/60Hz interference) and is suitable for measuring temperature, slowly changing pressure or voltage, but absolutely unsuitable for measuring vibration, shock, or high-frequency acoustic signals.

✅Will the input channels interfere with each other (crosstalk)?

A:

No. The NI-9219 features robust channel-to-channel isolation (up to 250 Vrms of continuous isolation). Each channel has its own independent ADC and isolation circuitry, meaning that connecting channel 1 to a 60V high voltage will absolutely not affect the microvolt-level thermocouple measurements on channel 2.​​​​​​​

✅When measuring current, why can't I find the 'External Shunt Resistor' setting option in the software?

A:

Because the NI-9219 has a built-in precise current shunt resistor, when you configure the channel to "Current" mode in the software, the module's internal relay switch automatically switches, directly introducing current into the built-in resistor for measurement. You don't need to connect an external resistor like with other general-purpose voltage cards.

✅How can I simultaneously measure different signals on four channels in LabVIEW or NI MAX?

A:

• In NI MAX: When creating a new task, add different types of physical channels for each of the four channels of the NI-9219 (e.g., select temperature for ai0, select voltage for ai1).
• In LabVIEW: When using DAQmx, do not combine different types of measurements into a single "Create Virtual Channel" VI. Multiple "Create Virtual Channel" VIs should be cascaded, each configuring the signal type for a different channel, and then combined into a single DAQmx task to start.

Contact Us

Ready to integrate reliable C series module control into your system? Our team is here to help you select the right configuration and provide ongoing support.

Contact our technical specialists at manager03@mxtdinfo.com  / manager02@mxtdinfo.com for detailed specifications, pricing information, or to discuss your custom requirements. We're committed to delivering the perfect NI-9219 C Series 4 CH 24 Bit AI Module solution for your application needs.